* [OpenRISC] [RFC 0/12] Unify asm/unaligned.h around struct helper
@ 2021-05-07 22:07 ` Arnd Bergmann
0 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: openrisc
From: Arnd Bergmann <arnd@arndb.de>
The get_unaligned()/put_unaligned() helpers are traditionally architecture
specific, with the two main variants being the "access-ok.h" version
that assumes unaligned pointer accesses always work on a particular
architecture, and the "le-struct.h" version that casts the data to a
byte aligned type before dereferencing, for architectures that cannot
always do unaligned accesses in hardware.
Based on the discussion linked below, it appears that the access-ok
version is not realiable on any architecture, but the struct version
probably has no downsides. This series changes the code to use the
same implementation on all architectures, addressing the few exceptions
separately.
I've pushed the patches to the asm-generic git tree for testing.
Arnd
Link: https://lore.kernel.org/lkml/75d07691-1e4f-741f-9852-38c0b4f520bc at synopsys.com/
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100363
Link: git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git unaligned-rework
Arnd Bergmann (12):
asm-generic: use asm-generic/unaligned.h for most architectures
openrisc: always use unaligned-struct header
sh: remove unaligned access for sh4a
m68k: select CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
powerpc: use linux/unaligned/le_struct.h on LE power7
asm-generic: unaligned: remove byteshift helpers
asm-generic: unaligned always use struct helpers
partitions: msdos: fix one-byte get_unaligned()
apparmor: use get_unaligned() only for multi-byte words
mwifiex: re-fix for unaligned accesses
netpoll: avoid put_unaligned() on single character
asm-generic: simplify asm/unaligned.h
arch/alpha/include/asm/unaligned.h | 12 --
arch/arm/include/asm/unaligned.h | 27 ---
arch/ia64/include/asm/unaligned.h | 12 --
arch/m68k/Kconfig | 1 +
arch/m68k/include/asm/unaligned.h | 26 ---
arch/microblaze/include/asm/unaligned.h | 27 ---
arch/mips/crypto/crc32-mips.c | 2 +-
arch/openrisc/include/asm/unaligned.h | 47 -----
arch/parisc/include/asm/unaligned.h | 6 +-
arch/powerpc/include/asm/unaligned.h | 22 ---
arch/sh/include/asm/unaligned-sh4a.h | 199 --------------------
arch/sh/include/asm/unaligned.h | 13 --
arch/sparc/include/asm/unaligned.h | 11 --
arch/x86/include/asm/unaligned.h | 15 --
arch/xtensa/include/asm/unaligned.h | 29 ---
block/partitions/ldm.h | 2 +-
block/partitions/msdos.c | 2 +-
drivers/net/wireless/marvell/mwifiex/pcie.c | 10 +-
include/asm-generic/unaligned.h | 149 ++++++++++++---
include/linux/unaligned/access_ok.h | 68 -------
include/linux/unaligned/be_byteshift.h | 71 -------
include/linux/unaligned/be_memmove.h | 37 ----
include/linux/unaligned/be_struct.h | 37 ----
include/linux/unaligned/generic.h | 115 -----------
include/linux/unaligned/le_byteshift.h | 71 -------
include/linux/unaligned/le_memmove.h | 37 ----
include/linux/unaligned/le_struct.h | 37 ----
include/linux/unaligned/memmove.h | 46 -----
net/core/netpoll.c | 4 +-
security/apparmor/policy_unpack.c | 2 +-
30 files changed, 137 insertions(+), 1000 deletions(-)
delete mode 100644 arch/alpha/include/asm/unaligned.h
delete mode 100644 arch/arm/include/asm/unaligned.h
delete mode 100644 arch/ia64/include/asm/unaligned.h
delete mode 100644 arch/m68k/include/asm/unaligned.h
delete mode 100644 arch/microblaze/include/asm/unaligned.h
delete mode 100644 arch/openrisc/include/asm/unaligned.h
delete mode 100644 arch/powerpc/include/asm/unaligned.h
delete mode 100644 arch/sh/include/asm/unaligned-sh4a.h
delete mode 100644 arch/sh/include/asm/unaligned.h
delete mode 100644 arch/sparc/include/asm/unaligned.h
delete mode 100644 arch/x86/include/asm/unaligned.h
delete mode 100644 arch/xtensa/include/asm/unaligned.h
delete mode 100644 include/linux/unaligned/access_ok.h
delete mode 100644 include/linux/unaligned/be_byteshift.h
delete mode 100644 include/linux/unaligned/be_memmove.h
delete mode 100644 include/linux/unaligned/be_struct.h
delete mode 100644 include/linux/unaligned/generic.h
delete mode 100644 include/linux/unaligned/le_byteshift.h
delete mode 100644 include/linux/unaligned/le_memmove.h
delete mode 100644 include/linux/unaligned/le_struct.h
delete mode 100644 include/linux/unaligned/memmove.h
Cc: Amitkumar Karwar <amitkarwar@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Ganapathi Bhat <ganapathi017@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: James Morris <jmorris@namei.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: John Johansen <john.johansen@canonical.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Rich Felker <dalias@libc.org>
Cc: "Richard Russon (FlatCap)" <ldm@flatcap.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Cc: Sharvari Harisangam <sharvari.harisangam@nxp.com>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vladimir Oltean <vladimir.oltean@nxp.com>
Cc: Xinming Hu <huxinming820@gmail.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: x86 at kernel.org
Cc: linux-kernel at vger.kernel.org
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-m68k at lists.linux-m68k.org
Cc: linux-crypto at vger.kernel.org
Cc: openrisc at lists.librecores.org
Cc: linuxppc-dev at lists.ozlabs.org
Cc: linux-sh at vger.kernel.org
Cc: sparclinux at vger.kernel.org
Cc: linux-ntfs-dev at lists.sourceforge.net
Cc: linux-block at vger.kernel.org
Cc: linux-wireless at vger.kernel.org
Cc: netdev at vger.kernel.org
Cc: linux-arch at vger.kernel.org
Cc: linux-security-module at vger.kernel.org
--
2.29.2
^ permalink raw reply [flat|nested] 50+ messages in thread
* [RFC 0/12] Unify asm/unaligned.h around struct helper
@ 2021-05-07 22:07 ` Arnd Bergmann
0 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, Amitkumar Karwar,
Benjamin Herrenschmidt, Borislav Petkov, Eric Dumazet,
Florian Fainelli, Ganapathi Bhat, Geert Uytterhoeven,
H. Peter Anvin, Ingo Molnar, Jakub Kicinski, James Morris,
Jens Axboe, John Johansen, Jonas Bonn, Kalle Valo,
Michael Ellerman, Paul Mackerras, Rich Felker,
Richard Russon (FlatCap),
Russell King, Serge E. Hallyn, Sharvari Harisangam,
Stafford Horne, Stefan Kristiansson, Thomas Gleixner,
Vladimir Oltean, Xinming Hu, Yoshinori Sato, x86, linux-kernel,
linux-arm-kernel, linux-m68k, linux-crypto, openrisc,
linuxppc-dev, linux-sh, sparclinux, linux-ntfs-dev, linux-block,
linux-wireless, netdev, linux-security-module
From: Arnd Bergmann <arnd@arndb.de>
The get_unaligned()/put_unaligned() helpers are traditionally architecture
specific, with the two main variants being the "access-ok.h" version
that assumes unaligned pointer accesses always work on a particular
architecture, and the "le-struct.h" version that casts the data to a
byte aligned type before dereferencing, for architectures that cannot
always do unaligned accesses in hardware.
Based on the discussion linked below, it appears that the access-ok
version is not realiable on any architecture, but the struct version
probably has no downsides. This series changes the code to use the
same implementation on all architectures, addressing the few exceptions
separately.
I've pushed the patches to the asm-generic git tree for testing.
Arnd
Link: https://lore.kernel.org/lkml/75d07691-1e4f-741f-9852-38c0b4f520bc@synopsys.com/
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100363
Link: git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git unaligned-rework
Arnd Bergmann (12):
asm-generic: use asm-generic/unaligned.h for most architectures
openrisc: always use unaligned-struct header
sh: remove unaligned access for sh4a
m68k: select CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
powerpc: use linux/unaligned/le_struct.h on LE power7
asm-generic: unaligned: remove byteshift helpers
asm-generic: unaligned always use struct helpers
partitions: msdos: fix one-byte get_unaligned()
apparmor: use get_unaligned() only for multi-byte words
mwifiex: re-fix for unaligned accesses
netpoll: avoid put_unaligned() on single character
asm-generic: simplify asm/unaligned.h
arch/alpha/include/asm/unaligned.h | 12 --
arch/arm/include/asm/unaligned.h | 27 ---
arch/ia64/include/asm/unaligned.h | 12 --
arch/m68k/Kconfig | 1 +
arch/m68k/include/asm/unaligned.h | 26 ---
arch/microblaze/include/asm/unaligned.h | 27 ---
arch/mips/crypto/crc32-mips.c | 2 +-
arch/openrisc/include/asm/unaligned.h | 47 -----
arch/parisc/include/asm/unaligned.h | 6 +-
arch/powerpc/include/asm/unaligned.h | 22 ---
arch/sh/include/asm/unaligned-sh4a.h | 199 --------------------
arch/sh/include/asm/unaligned.h | 13 --
arch/sparc/include/asm/unaligned.h | 11 --
arch/x86/include/asm/unaligned.h | 15 --
arch/xtensa/include/asm/unaligned.h | 29 ---
block/partitions/ldm.h | 2 +-
block/partitions/msdos.c | 2 +-
drivers/net/wireless/marvell/mwifiex/pcie.c | 10 +-
include/asm-generic/unaligned.h | 149 ++++++++++++---
include/linux/unaligned/access_ok.h | 68 -------
include/linux/unaligned/be_byteshift.h | 71 -------
include/linux/unaligned/be_memmove.h | 37 ----
include/linux/unaligned/be_struct.h | 37 ----
include/linux/unaligned/generic.h | 115 -----------
include/linux/unaligned/le_byteshift.h | 71 -------
include/linux/unaligned/le_memmove.h | 37 ----
include/linux/unaligned/le_struct.h | 37 ----
include/linux/unaligned/memmove.h | 46 -----
net/core/netpoll.c | 4 +-
security/apparmor/policy_unpack.c | 2 +-
30 files changed, 137 insertions(+), 1000 deletions(-)
delete mode 100644 arch/alpha/include/asm/unaligned.h
delete mode 100644 arch/arm/include/asm/unaligned.h
delete mode 100644 arch/ia64/include/asm/unaligned.h
delete mode 100644 arch/m68k/include/asm/unaligned.h
delete mode 100644 arch/microblaze/include/asm/unaligned.h
delete mode 100644 arch/openrisc/include/asm/unaligned.h
delete mode 100644 arch/powerpc/include/asm/unaligned.h
delete mode 100644 arch/sh/include/asm/unaligned-sh4a.h
delete mode 100644 arch/sh/include/asm/unaligned.h
delete mode 100644 arch/sparc/include/asm/unaligned.h
delete mode 100644 arch/x86/include/asm/unaligned.h
delete mode 100644 arch/xtensa/include/asm/unaligned.h
delete mode 100644 include/linux/unaligned/access_ok.h
delete mode 100644 include/linux/unaligned/be_byteshift.h
delete mode 100644 include/linux/unaligned/be_memmove.h
delete mode 100644 include/linux/unaligned/be_struct.h
delete mode 100644 include/linux/unaligned/generic.h
delete mode 100644 include/linux/unaligned/le_byteshift.h
delete mode 100644 include/linux/unaligned/le_memmove.h
delete mode 100644 include/linux/unaligned/le_struct.h
delete mode 100644 include/linux/unaligned/memmove.h
Cc: Amitkumar Karwar <amitkarwar@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Ganapathi Bhat <ganapathi017@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: James Morris <jmorris@namei.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: John Johansen <john.johansen@canonical.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Rich Felker <dalias@libc.org>
Cc: "Richard Russon (FlatCap)" <ldm@flatcap.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Cc: Sharvari Harisangam <sharvari.harisangam@nxp.com>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vladimir Oltean <vladimir.oltean@nxp.com>
Cc: Xinming Hu <huxinming820@gmail.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: x86@kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-m68k@lists.linux-m68k.org
Cc: linux-crypto@vger.kernel.org
Cc: openrisc@lists.librecores.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-sh@vger.kernel.org
Cc: sparclinux@vger.kernel.org
Cc: linux-ntfs-dev@lists.sourceforge.net
Cc: linux-block@vger.kernel.org
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-security-module@vger.kernel.org
--
2.29.2
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 50+ messages in thread
* [RFC 0/12] Unify asm/unaligned.h around struct helper
@ 2021-05-07 22:07 ` Arnd Bergmann
0 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch
Cc: Rich Felker, linux-sh, Richard Russon (FlatCap),
Amitkumar Karwar, Russell King, Eric Dumazet, Paul Mackerras,
H. Peter Anvin, sparclinux, Thomas Gleixner, Jonas Bonn,
Florian Fainelli, Yoshinori Sato, x86, James Morris, Ingo Molnar,
Geert Uytterhoeven, linux-arm-kernel, Jakub Kicinski,
Serge E. Hallyn, Arnd Bergmann, Ganapathi Bhat, linuxppc-dev,
Stefan Kristiansson, linux-block, linux-m68k, openrisc,
Borislav Petkov, Stafford Horne, Kalle Valo, Jens Axboe,
John Johansen, Xinming Hu, Vineet Gupta, linux-wireless,
linux-kernel, Vladimir Oltean, linux-ntfs-dev,
linux-security-module, linux-crypto, netdev, Linus Torvalds,
Sharvari Harisangam
From: Arnd Bergmann <arnd@arndb.de>
The get_unaligned()/put_unaligned() helpers are traditionally architecture
specific, with the two main variants being the "access-ok.h" version
that assumes unaligned pointer accesses always work on a particular
architecture, and the "le-struct.h" version that casts the data to a
byte aligned type before dereferencing, for architectures that cannot
always do unaligned accesses in hardware.
Based on the discussion linked below, it appears that the access-ok
version is not realiable on any architecture, but the struct version
probably has no downsides. This series changes the code to use the
same implementation on all architectures, addressing the few exceptions
separately.
I've pushed the patches to the asm-generic git tree for testing.
Arnd
Link: https://lore.kernel.org/lkml/75d07691-1e4f-741f-9852-38c0b4f520bc@synopsys.com/
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100363
Link: git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git unaligned-rework
Arnd Bergmann (12):
asm-generic: use asm-generic/unaligned.h for most architectures
openrisc: always use unaligned-struct header
sh: remove unaligned access for sh4a
m68k: select CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
powerpc: use linux/unaligned/le_struct.h on LE power7
asm-generic: unaligned: remove byteshift helpers
asm-generic: unaligned always use struct helpers
partitions: msdos: fix one-byte get_unaligned()
apparmor: use get_unaligned() only for multi-byte words
mwifiex: re-fix for unaligned accesses
netpoll: avoid put_unaligned() on single character
asm-generic: simplify asm/unaligned.h
arch/alpha/include/asm/unaligned.h | 12 --
arch/arm/include/asm/unaligned.h | 27 ---
arch/ia64/include/asm/unaligned.h | 12 --
arch/m68k/Kconfig | 1 +
arch/m68k/include/asm/unaligned.h | 26 ---
arch/microblaze/include/asm/unaligned.h | 27 ---
arch/mips/crypto/crc32-mips.c | 2 +-
arch/openrisc/include/asm/unaligned.h | 47 -----
arch/parisc/include/asm/unaligned.h | 6 +-
arch/powerpc/include/asm/unaligned.h | 22 ---
arch/sh/include/asm/unaligned-sh4a.h | 199 --------------------
arch/sh/include/asm/unaligned.h | 13 --
arch/sparc/include/asm/unaligned.h | 11 --
arch/x86/include/asm/unaligned.h | 15 --
arch/xtensa/include/asm/unaligned.h | 29 ---
block/partitions/ldm.h | 2 +-
block/partitions/msdos.c | 2 +-
drivers/net/wireless/marvell/mwifiex/pcie.c | 10 +-
include/asm-generic/unaligned.h | 149 ++++++++++++---
include/linux/unaligned/access_ok.h | 68 -------
include/linux/unaligned/be_byteshift.h | 71 -------
include/linux/unaligned/be_memmove.h | 37 ----
include/linux/unaligned/be_struct.h | 37 ----
include/linux/unaligned/generic.h | 115 -----------
include/linux/unaligned/le_byteshift.h | 71 -------
include/linux/unaligned/le_memmove.h | 37 ----
include/linux/unaligned/le_struct.h | 37 ----
include/linux/unaligned/memmove.h | 46 -----
net/core/netpoll.c | 4 +-
security/apparmor/policy_unpack.c | 2 +-
30 files changed, 137 insertions(+), 1000 deletions(-)
delete mode 100644 arch/alpha/include/asm/unaligned.h
delete mode 100644 arch/arm/include/asm/unaligned.h
delete mode 100644 arch/ia64/include/asm/unaligned.h
delete mode 100644 arch/m68k/include/asm/unaligned.h
delete mode 100644 arch/microblaze/include/asm/unaligned.h
delete mode 100644 arch/openrisc/include/asm/unaligned.h
delete mode 100644 arch/powerpc/include/asm/unaligned.h
delete mode 100644 arch/sh/include/asm/unaligned-sh4a.h
delete mode 100644 arch/sh/include/asm/unaligned.h
delete mode 100644 arch/sparc/include/asm/unaligned.h
delete mode 100644 arch/x86/include/asm/unaligned.h
delete mode 100644 arch/xtensa/include/asm/unaligned.h
delete mode 100644 include/linux/unaligned/access_ok.h
delete mode 100644 include/linux/unaligned/be_byteshift.h
delete mode 100644 include/linux/unaligned/be_memmove.h
delete mode 100644 include/linux/unaligned/be_struct.h
delete mode 100644 include/linux/unaligned/generic.h
delete mode 100644 include/linux/unaligned/le_byteshift.h
delete mode 100644 include/linux/unaligned/le_memmove.h
delete mode 100644 include/linux/unaligned/le_struct.h
delete mode 100644 include/linux/unaligned/memmove.h
Cc: Amitkumar Karwar <amitkarwar@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Ganapathi Bhat <ganapathi017@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: James Morris <jmorris@namei.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: John Johansen <john.johansen@canonical.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Rich Felker <dalias@libc.org>
Cc: "Richard Russon (FlatCap)" <ldm@flatcap.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Cc: Sharvari Harisangam <sharvari.harisangam@nxp.com>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vladimir Oltean <vladimir.oltean@nxp.com>
Cc: Xinming Hu <huxinming820@gmail.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: x86@kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-m68k@lists.linux-m68k.org
Cc: linux-crypto@vger.kernel.org
Cc: openrisc@lists.librecores.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-sh@vger.kernel.org
Cc: sparclinux@vger.kernel.org
Cc: linux-ntfs-dev@lists.sourceforge.net
Cc: linux-block@vger.kernel.org
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-security-module@vger.kernel.org
--
2.29.2
^ permalink raw reply [flat|nested] 50+ messages in thread
* [RFC 01/12] asm-generic: use asm-generic/unaligned.h for most architectures
2021-05-07 22:07 ` Arnd Bergmann
(?)
@ 2021-05-07 22:07 ` Arnd Bergmann
-1 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, Richard Henderson,
Ivan Kokshaysky, Matt Turner, Geert Uytterhoeven, Michal Simek,
James E.J. Bottomley, Helge Deller, David S. Miller,
Thomas Gleixner, Ingo Molnar, Borislav Petkov, x86,
H. Peter Anvin, Chris Zankel, Max Filippov, linux-alpha,
linux-kernel, linux-ia64, linux-m68k, linux-parisc, sparclinux,
linux-xtensa
From: Arnd Bergmann <arnd@arndb.de>
There are several architectures that just duplicate the contents
of asm-generic/unaligned.h, so change those over to use the
file directly, to make future modifications easier.
The exceptions are:
- arm32 sets HAVE_EFFICIENT_UNALIGNED_ACCESS, but wants the
unaligned-struct version
- ppc64le disables HAVE_EFFICIENT_UNALIGNED_ACCESS but includes
the access-ok version
- m68k (non-dragonball) also uses the access-ok version without
setting HAVE_EFFICIENT_UNALIGNED_ACCESS.
- sh4a has a custom inline asm version
- openrisc is the only one using the memmove version that
generally leads to worse code.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/alpha/include/asm/unaligned.h | 12 ----------
arch/ia64/include/asm/unaligned.h | 12 ----------
arch/m68k/include/asm/unaligned.h | 9 +-------
arch/microblaze/include/asm/unaligned.h | 27 -----------------------
arch/parisc/include/asm/unaligned.h | 6 +----
arch/sparc/include/asm/unaligned.h | 11 ----------
arch/x86/include/asm/unaligned.h | 15 -------------
arch/xtensa/include/asm/unaligned.h | 29 -------------------------
8 files changed, 2 insertions(+), 119 deletions(-)
delete mode 100644 arch/alpha/include/asm/unaligned.h
delete mode 100644 arch/ia64/include/asm/unaligned.h
delete mode 100644 arch/microblaze/include/asm/unaligned.h
delete mode 100644 arch/sparc/include/asm/unaligned.h
delete mode 100644 arch/x86/include/asm/unaligned.h
delete mode 100644 arch/xtensa/include/asm/unaligned.h
diff --git a/arch/alpha/include/asm/unaligned.h b/arch/alpha/include/asm/unaligned.h
deleted file mode 100644
index 863c807b66f8..000000000000
--- a/arch/alpha/include/asm/unaligned.h
+++ /dev/null
@@ -1,12 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_ALPHA_UNALIGNED_H
-#define _ASM_ALPHA_UNALIGNED_H
-
-#include <linux/unaligned/le_struct.h>
-#include <linux/unaligned/be_byteshift.h>
-#include <linux/unaligned/generic.h>
-
-#define get_unaligned __get_unaligned_le
-#define put_unaligned __put_unaligned_le
-
-#endif /* _ASM_ALPHA_UNALIGNED_H */
diff --git a/arch/ia64/include/asm/unaligned.h b/arch/ia64/include/asm/unaligned.h
deleted file mode 100644
index 328942e3cbce..000000000000
--- a/arch/ia64/include/asm/unaligned.h
+++ /dev/null
@@ -1,12 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_IA64_UNALIGNED_H
-#define _ASM_IA64_UNALIGNED_H
-
-#include <linux/unaligned/le_struct.h>
-#include <linux/unaligned/be_byteshift.h>
-#include <linux/unaligned/generic.h>
-
-#define get_unaligned __get_unaligned_le
-#define put_unaligned __put_unaligned_le
-
-#endif /* _ASM_IA64_UNALIGNED_H */
diff --git a/arch/m68k/include/asm/unaligned.h b/arch/m68k/include/asm/unaligned.h
index 98c8930d3d35..84e437337344 100644
--- a/arch/m68k/include/asm/unaligned.h
+++ b/arch/m68k/include/asm/unaligned.h
@@ -2,15 +2,8 @@
#ifndef _ASM_M68K_UNALIGNED_H
#define _ASM_M68K_UNALIGNED_H
-
#ifdef CONFIG_CPU_HAS_NO_UNALIGNED
-#include <linux/unaligned/be_struct.h>
-#include <linux/unaligned/le_byteshift.h>
-#include <linux/unaligned/generic.h>
-
-#define get_unaligned __get_unaligned_be
-#define put_unaligned __put_unaligned_be
-
+#include <asm-generic/unaligned.h>
#else
/*
* The m68k can do unaligned accesses itself.
diff --git a/arch/microblaze/include/asm/unaligned.h b/arch/microblaze/include/asm/unaligned.h
deleted file mode 100644
index 448299beab69..000000000000
--- a/arch/microblaze/include/asm/unaligned.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Copyright (C) 2008 Michal Simek <monstr@monstr.eu>
- * Copyright (C) 2006 Atmark Techno, Inc.
- */
-
-#ifndef _ASM_MICROBLAZE_UNALIGNED_H
-#define _ASM_MICROBLAZE_UNALIGNED_H
-
-# ifdef __KERNEL__
-
-# ifdef __MICROBLAZEEL__
-# include <linux/unaligned/le_struct.h>
-# include <linux/unaligned/be_byteshift.h>
-# define get_unaligned __get_unaligned_le
-# define put_unaligned __put_unaligned_le
-# else
-# include <linux/unaligned/be_struct.h>
-# include <linux/unaligned/le_byteshift.h>
-# define get_unaligned __get_unaligned_be
-# define put_unaligned __put_unaligned_be
-# endif
-
-# include <linux/unaligned/generic.h>
-
-# endif /* __KERNEL__ */
-#endif /* _ASM_MICROBLAZE_UNALIGNED_H */
diff --git a/arch/parisc/include/asm/unaligned.h b/arch/parisc/include/asm/unaligned.h
index e9029c7c2a69..3bda16773ba6 100644
--- a/arch/parisc/include/asm/unaligned.h
+++ b/arch/parisc/include/asm/unaligned.h
@@ -2,11 +2,7 @@
#ifndef _ASM_PARISC_UNALIGNED_H
#define _ASM_PARISC_UNALIGNED_H
-#include <linux/unaligned/be_struct.h>
-#include <linux/unaligned/le_byteshift.h>
-#include <linux/unaligned/generic.h>
-#define get_unaligned __get_unaligned_be
-#define put_unaligned __put_unaligned_be
+#include <asm-generic/unaligned.h>
#ifdef __KERNEL__
struct pt_regs;
diff --git a/arch/sparc/include/asm/unaligned.h b/arch/sparc/include/asm/unaligned.h
deleted file mode 100644
index 7971d89d2f54..000000000000
--- a/arch/sparc/include/asm/unaligned.h
+++ /dev/null
@@ -1,11 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_SPARC_UNALIGNED_H
-#define _ASM_SPARC_UNALIGNED_H
-
-#include <linux/unaligned/be_struct.h>
-#include <linux/unaligned/le_byteshift.h>
-#include <linux/unaligned/generic.h>
-#define get_unaligned __get_unaligned_be
-#define put_unaligned __put_unaligned_be
-
-#endif /* _ASM_SPARC_UNALIGNED_H */
diff --git a/arch/x86/include/asm/unaligned.h b/arch/x86/include/asm/unaligned.h
deleted file mode 100644
index 9c754a7447aa..000000000000
--- a/arch/x86/include/asm/unaligned.h
+++ /dev/null
@@ -1,15 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_X86_UNALIGNED_H
-#define _ASM_X86_UNALIGNED_H
-
-/*
- * The x86 can do unaligned accesses itself.
- */
-
-#include <linux/unaligned/access_ok.h>
-#include <linux/unaligned/generic.h>
-
-#define get_unaligned __get_unaligned_le
-#define put_unaligned __put_unaligned_le
-
-#endif /* _ASM_X86_UNALIGNED_H */
diff --git a/arch/xtensa/include/asm/unaligned.h b/arch/xtensa/include/asm/unaligned.h
deleted file mode 100644
index 8e7ed046bfed..000000000000
--- a/arch/xtensa/include/asm/unaligned.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/*
- * Xtensa doesn't handle unaligned accesses efficiently.
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 2001 - 2005 Tensilica Inc.
- */
-#ifndef _ASM_XTENSA_UNALIGNED_H
-#define _ASM_XTENSA_UNALIGNED_H
-
-#include <asm/byteorder.h>
-
-#ifdef __LITTLE_ENDIAN
-# include <linux/unaligned/le_struct.h>
-# include <linux/unaligned/be_byteshift.h>
-# include <linux/unaligned/generic.h>
-# define get_unaligned __get_unaligned_le
-# define put_unaligned __put_unaligned_le
-#else
-# include <linux/unaligned/be_struct.h>
-# include <linux/unaligned/le_byteshift.h>
-# include <linux/unaligned/generic.h>
-# define get_unaligned __get_unaligned_be
-# define put_unaligned __put_unaligned_be
-#endif
-
-#endif /* _ASM_XTENSA_UNALIGNED_H */
--
2.29.2
^ permalink raw reply related [flat|nested] 50+ messages in thread
* [RFC 01/12] asm-generic: use asm-generic/unaligned.h for most architectures
@ 2021-05-07 22:07 ` Arnd Bergmann
0 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, Richard Henderson,
Ivan Kokshaysky, Matt Turner, Geert Uytterhoeven, Michal Simek,
James E.J. Bottomley, Helge Deller, David S. Miller,
Thomas Gleixner, Ingo Molnar, Borislav Petkov, x86,
H. Peter Anvin, Chris Zankel, Max Filippov, linux-alpha,
linux-kernel, linux-ia64, linux-m68k
From: Arnd Bergmann <arnd@arndb.de>
There are several architectures that just duplicate the contents
of asm-generic/unaligned.h, so change those over to use the
file directly, to make future modifications easier.
The exceptions are:
- arm32 sets HAVE_EFFICIENT_UNALIGNED_ACCESS, but wants the
unaligned-struct version
- ppc64le disables HAVE_EFFICIENT_UNALIGNED_ACCESS but includes
the access-ok version
- m68k (non-dragonball) also uses the access-ok version without
setting HAVE_EFFICIENT_UNALIGNED_ACCESS.
- sh4a has a custom inline asm version
- openrisc is the only one using the memmove version that
generally leads to worse code.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/alpha/include/asm/unaligned.h | 12 ----------
arch/ia64/include/asm/unaligned.h | 12 ----------
arch/m68k/include/asm/unaligned.h | 9 +-------
arch/microblaze/include/asm/unaligned.h | 27 -----------------------
arch/parisc/include/asm/unaligned.h | 6 +----
arch/sparc/include/asm/unaligned.h | 11 ----------
arch/x86/include/asm/unaligned.h | 15 -------------
arch/xtensa/include/asm/unaligned.h | 29 -------------------------
8 files changed, 2 insertions(+), 119 deletions(-)
delete mode 100644 arch/alpha/include/asm/unaligned.h
delete mode 100644 arch/ia64/include/asm/unaligned.h
delete mode 100644 arch/microblaze/include/asm/unaligned.h
delete mode 100644 arch/sparc/include/asm/unaligned.h
delete mode 100644 arch/x86/include/asm/unaligned.h
delete mode 100644 arch/xtensa/include/asm/unaligned.h
diff --git a/arch/alpha/include/asm/unaligned.h b/arch/alpha/include/asm/unaligned.h
deleted file mode 100644
index 863c807b66f8..000000000000
--- a/arch/alpha/include/asm/unaligned.h
+++ /dev/null
@@ -1,12 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_ALPHA_UNALIGNED_H
-#define _ASM_ALPHA_UNALIGNED_H
-
-#include <linux/unaligned/le_struct.h>
-#include <linux/unaligned/be_byteshift.h>
-#include <linux/unaligned/generic.h>
-
-#define get_unaligned __get_unaligned_le
-#define put_unaligned __put_unaligned_le
-
-#endif /* _ASM_ALPHA_UNALIGNED_H */
diff --git a/arch/ia64/include/asm/unaligned.h b/arch/ia64/include/asm/unaligned.h
deleted file mode 100644
index 328942e3cbce..000000000000
--- a/arch/ia64/include/asm/unaligned.h
+++ /dev/null
@@ -1,12 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_IA64_UNALIGNED_H
-#define _ASM_IA64_UNALIGNED_H
-
-#include <linux/unaligned/le_struct.h>
-#include <linux/unaligned/be_byteshift.h>
-#include <linux/unaligned/generic.h>
-
-#define get_unaligned __get_unaligned_le
-#define put_unaligned __put_unaligned_le
-
-#endif /* _ASM_IA64_UNALIGNED_H */
diff --git a/arch/m68k/include/asm/unaligned.h b/arch/m68k/include/asm/unaligned.h
index 98c8930d3d35..84e437337344 100644
--- a/arch/m68k/include/asm/unaligned.h
+++ b/arch/m68k/include/asm/unaligned.h
@@ -2,15 +2,8 @@
#ifndef _ASM_M68K_UNALIGNED_H
#define _ASM_M68K_UNALIGNED_H
-
#ifdef CONFIG_CPU_HAS_NO_UNALIGNED
-#include <linux/unaligned/be_struct.h>
-#include <linux/unaligned/le_byteshift.h>
-#include <linux/unaligned/generic.h>
-
-#define get_unaligned __get_unaligned_be
-#define put_unaligned __put_unaligned_be
-
+#include <asm-generic/unaligned.h>
#else
/*
* The m68k can do unaligned accesses itself.
diff --git a/arch/microblaze/include/asm/unaligned.h b/arch/microblaze/include/asm/unaligned.h
deleted file mode 100644
index 448299beab69..000000000000
--- a/arch/microblaze/include/asm/unaligned.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Copyright (C) 2008 Michal Simek <monstr@monstr.eu>
- * Copyright (C) 2006 Atmark Techno, Inc.
- */
-
-#ifndef _ASM_MICROBLAZE_UNALIGNED_H
-#define _ASM_MICROBLAZE_UNALIGNED_H
-
-# ifdef __KERNEL__
-
-# ifdef __MICROBLAZEEL__
-# include <linux/unaligned/le_struct.h>
-# include <linux/unaligned/be_byteshift.h>
-# define get_unaligned __get_unaligned_le
-# define put_unaligned __put_unaligned_le
-# else
-# include <linux/unaligned/be_struct.h>
-# include <linux/unaligned/le_byteshift.h>
-# define get_unaligned __get_unaligned_be
-# define put_unaligned __put_unaligned_be
-# endif
-
-# include <linux/unaligned/generic.h>
-
-# endif /* __KERNEL__ */
-#endif /* _ASM_MICROBLAZE_UNALIGNED_H */
diff --git a/arch/parisc/include/asm/unaligned.h b/arch/parisc/include/asm/unaligned.h
index e9029c7c2a69..3bda16773ba6 100644
--- a/arch/parisc/include/asm/unaligned.h
+++ b/arch/parisc/include/asm/unaligned.h
@@ -2,11 +2,7 @@
#ifndef _ASM_PARISC_UNALIGNED_H
#define _ASM_PARISC_UNALIGNED_H
-#include <linux/unaligned/be_struct.h>
-#include <linux/unaligned/le_byteshift.h>
-#include <linux/unaligned/generic.h>
-#define get_unaligned __get_unaligned_be
-#define put_unaligned __put_unaligned_be
+#include <asm-generic/unaligned.h>
#ifdef __KERNEL__
struct pt_regs;
diff --git a/arch/sparc/include/asm/unaligned.h b/arch/sparc/include/asm/unaligned.h
deleted file mode 100644
index 7971d89d2f54..000000000000
--- a/arch/sparc/include/asm/unaligned.h
+++ /dev/null
@@ -1,11 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_SPARC_UNALIGNED_H
-#define _ASM_SPARC_UNALIGNED_H
-
-#include <linux/unaligned/be_struct.h>
-#include <linux/unaligned/le_byteshift.h>
-#include <linux/unaligned/generic.h>
-#define get_unaligned __get_unaligned_be
-#define put_unaligned __put_unaligned_be
-
-#endif /* _ASM_SPARC_UNALIGNED_H */
diff --git a/arch/x86/include/asm/unaligned.h b/arch/x86/include/asm/unaligned.h
deleted file mode 100644
index 9c754a7447aa..000000000000
--- a/arch/x86/include/asm/unaligned.h
+++ /dev/null
@@ -1,15 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_X86_UNALIGNED_H
-#define _ASM_X86_UNALIGNED_H
-
-/*
- * The x86 can do unaligned accesses itself.
- */
-
-#include <linux/unaligned/access_ok.h>
-#include <linux/unaligned/generic.h>
-
-#define get_unaligned __get_unaligned_le
-#define put_unaligned __put_unaligned_le
-
-#endif /* _ASM_X86_UNALIGNED_H */
diff --git a/arch/xtensa/include/asm/unaligned.h b/arch/xtensa/include/asm/unaligned.h
deleted file mode 100644
index 8e7ed046bfed..000000000000
--- a/arch/xtensa/include/asm/unaligned.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/*
- * Xtensa doesn't handle unaligned accesses efficiently.
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 2001 - 2005 Tensilica Inc.
- */
-#ifndef _ASM_XTENSA_UNALIGNED_H
-#define _ASM_XTENSA_UNALIGNED_H
-
-#include <asm/byteorder.h>
-
-#ifdef __LITTLE_ENDIAN
-# include <linux/unaligned/le_struct.h>
-# include <linux/unaligned/be_byteshift.h>
-# include <linux/unaligned/generic.h>
-# define get_unaligned __get_unaligned_le
-# define put_unaligned __put_unaligned_le
-#else
-# include <linux/unaligned/be_struct.h>
-# include <linux/unaligned/le_byteshift.h>
-# include <linux/unaligned/generic.h>
-# define get_unaligned __get_unaligned_be
-# define put_unaligned __put_unaligned_be
-#endif
-
-#endif /* _ASM_XTENSA_UNALIGNED_H */
--
2.29.2
^ permalink raw reply related [flat|nested] 50+ messages in thread
* [RFC 01/12] asm-generic: use asm-generic/unaligned.h for most architectures
@ 2021-05-07 22:07 ` Arnd Bergmann
0 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, Richard Henderson,
Ivan Kokshaysky, Matt Turner, Geert Uytterhoeven, Michal Simek,
James E.J. Bottomley, Helge Deller, David S. Miller,
Thomas Gleixner, Ingo Molnar, Borislav Petkov, x86,
H. Peter Anvin, Chris Zankel, Max Filippov, linux-alpha,
linux-kernel, linux-ia64, linux-m68k, linux-parisc, sparclinux,
linux-xtensa
From: Arnd Bergmann <arnd@arndb.de>
There are several architectures that just duplicate the contents
of asm-generic/unaligned.h, so change those over to use the
file directly, to make future modifications easier.
The exceptions are:
- arm32 sets HAVE_EFFICIENT_UNALIGNED_ACCESS, but wants the
unaligned-struct version
- ppc64le disables HAVE_EFFICIENT_UNALIGNED_ACCESS but includes
the access-ok version
- m68k (non-dragonball) also uses the access-ok version without
setting HAVE_EFFICIENT_UNALIGNED_ACCESS.
- sh4a has a custom inline asm version
- openrisc is the only one using the memmove version that
generally leads to worse code.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/alpha/include/asm/unaligned.h | 12 ----------
arch/ia64/include/asm/unaligned.h | 12 ----------
arch/m68k/include/asm/unaligned.h | 9 +-------
arch/microblaze/include/asm/unaligned.h | 27 -----------------------
arch/parisc/include/asm/unaligned.h | 6 +----
arch/sparc/include/asm/unaligned.h | 11 ----------
arch/x86/include/asm/unaligned.h | 15 -------------
arch/xtensa/include/asm/unaligned.h | 29 -------------------------
8 files changed, 2 insertions(+), 119 deletions(-)
delete mode 100644 arch/alpha/include/asm/unaligned.h
delete mode 100644 arch/ia64/include/asm/unaligned.h
delete mode 100644 arch/microblaze/include/asm/unaligned.h
delete mode 100644 arch/sparc/include/asm/unaligned.h
delete mode 100644 arch/x86/include/asm/unaligned.h
delete mode 100644 arch/xtensa/include/asm/unaligned.h
diff --git a/arch/alpha/include/asm/unaligned.h b/arch/alpha/include/asm/unaligned.h
deleted file mode 100644
index 863c807b66f8..000000000000
--- a/arch/alpha/include/asm/unaligned.h
+++ /dev/null
@@ -1,12 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_ALPHA_UNALIGNED_H
-#define _ASM_ALPHA_UNALIGNED_H
-
-#include <linux/unaligned/le_struct.h>
-#include <linux/unaligned/be_byteshift.h>
-#include <linux/unaligned/generic.h>
-
-#define get_unaligned __get_unaligned_le
-#define put_unaligned __put_unaligned_le
-
-#endif /* _ASM_ALPHA_UNALIGNED_H */
diff --git a/arch/ia64/include/asm/unaligned.h b/arch/ia64/include/asm/unaligned.h
deleted file mode 100644
index 328942e3cbce..000000000000
--- a/arch/ia64/include/asm/unaligned.h
+++ /dev/null
@@ -1,12 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_IA64_UNALIGNED_H
-#define _ASM_IA64_UNALIGNED_H
-
-#include <linux/unaligned/le_struct.h>
-#include <linux/unaligned/be_byteshift.h>
-#include <linux/unaligned/generic.h>
-
-#define get_unaligned __get_unaligned_le
-#define put_unaligned __put_unaligned_le
-
-#endif /* _ASM_IA64_UNALIGNED_H */
diff --git a/arch/m68k/include/asm/unaligned.h b/arch/m68k/include/asm/unaligned.h
index 98c8930d3d35..84e437337344 100644
--- a/arch/m68k/include/asm/unaligned.h
+++ b/arch/m68k/include/asm/unaligned.h
@@ -2,15 +2,8 @@
#ifndef _ASM_M68K_UNALIGNED_H
#define _ASM_M68K_UNALIGNED_H
-
#ifdef CONFIG_CPU_HAS_NO_UNALIGNED
-#include <linux/unaligned/be_struct.h>
-#include <linux/unaligned/le_byteshift.h>
-#include <linux/unaligned/generic.h>
-
-#define get_unaligned __get_unaligned_be
-#define put_unaligned __put_unaligned_be
-
+#include <asm-generic/unaligned.h>
#else
/*
* The m68k can do unaligned accesses itself.
diff --git a/arch/microblaze/include/asm/unaligned.h b/arch/microblaze/include/asm/unaligned.h
deleted file mode 100644
index 448299beab69..000000000000
--- a/arch/microblaze/include/asm/unaligned.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Copyright (C) 2008 Michal Simek <monstr@monstr.eu>
- * Copyright (C) 2006 Atmark Techno, Inc.
- */
-
-#ifndef _ASM_MICROBLAZE_UNALIGNED_H
-#define _ASM_MICROBLAZE_UNALIGNED_H
-
-# ifdef __KERNEL__
-
-# ifdef __MICROBLAZEEL__
-# include <linux/unaligned/le_struct.h>
-# include <linux/unaligned/be_byteshift.h>
-# define get_unaligned __get_unaligned_le
-# define put_unaligned __put_unaligned_le
-# else
-# include <linux/unaligned/be_struct.h>
-# include <linux/unaligned/le_byteshift.h>
-# define get_unaligned __get_unaligned_be
-# define put_unaligned __put_unaligned_be
-# endif
-
-# include <linux/unaligned/generic.h>
-
-# endif /* __KERNEL__ */
-#endif /* _ASM_MICROBLAZE_UNALIGNED_H */
diff --git a/arch/parisc/include/asm/unaligned.h b/arch/parisc/include/asm/unaligned.h
index e9029c7c2a69..3bda16773ba6 100644
--- a/arch/parisc/include/asm/unaligned.h
+++ b/arch/parisc/include/asm/unaligned.h
@@ -2,11 +2,7 @@
#ifndef _ASM_PARISC_UNALIGNED_H
#define _ASM_PARISC_UNALIGNED_H
-#include <linux/unaligned/be_struct.h>
-#include <linux/unaligned/le_byteshift.h>
-#include <linux/unaligned/generic.h>
-#define get_unaligned __get_unaligned_be
-#define put_unaligned __put_unaligned_be
+#include <asm-generic/unaligned.h>
#ifdef __KERNEL__
struct pt_regs;
diff --git a/arch/sparc/include/asm/unaligned.h b/arch/sparc/include/asm/unaligned.h
deleted file mode 100644
index 7971d89d2f54..000000000000
--- a/arch/sparc/include/asm/unaligned.h
+++ /dev/null
@@ -1,11 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_SPARC_UNALIGNED_H
-#define _ASM_SPARC_UNALIGNED_H
-
-#include <linux/unaligned/be_struct.h>
-#include <linux/unaligned/le_byteshift.h>
-#include <linux/unaligned/generic.h>
-#define get_unaligned __get_unaligned_be
-#define put_unaligned __put_unaligned_be
-
-#endif /* _ASM_SPARC_UNALIGNED_H */
diff --git a/arch/x86/include/asm/unaligned.h b/arch/x86/include/asm/unaligned.h
deleted file mode 100644
index 9c754a7447aa..000000000000
--- a/arch/x86/include/asm/unaligned.h
+++ /dev/null
@@ -1,15 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_X86_UNALIGNED_H
-#define _ASM_X86_UNALIGNED_H
-
-/*
- * The x86 can do unaligned accesses itself.
- */
-
-#include <linux/unaligned/access_ok.h>
-#include <linux/unaligned/generic.h>
-
-#define get_unaligned __get_unaligned_le
-#define put_unaligned __put_unaligned_le
-
-#endif /* _ASM_X86_UNALIGNED_H */
diff --git a/arch/xtensa/include/asm/unaligned.h b/arch/xtensa/include/asm/unaligned.h
deleted file mode 100644
index 8e7ed046bfed..000000000000
--- a/arch/xtensa/include/asm/unaligned.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/*
- * Xtensa doesn't handle unaligned accesses efficiently.
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 2001 - 2005 Tensilica Inc.
- */
-#ifndef _ASM_XTENSA_UNALIGNED_H
-#define _ASM_XTENSA_UNALIGNED_H
-
-#include <asm/byteorder.h>
-
-#ifdef __LITTLE_ENDIAN
-# include <linux/unaligned/le_struct.h>
-# include <linux/unaligned/be_byteshift.h>
-# include <linux/unaligned/generic.h>
-# define get_unaligned __get_unaligned_le
-# define put_unaligned __put_unaligned_le
-#else
-# include <linux/unaligned/be_struct.h>
-# include <linux/unaligned/le_byteshift.h>
-# include <linux/unaligned/generic.h>
-# define get_unaligned __get_unaligned_be
-# define put_unaligned __put_unaligned_be
-#endif
-
-#endif /* _ASM_XTENSA_UNALIGNED_H */
--
2.29.2
^ permalink raw reply related [flat|nested] 50+ messages in thread
* Re: [RFC 01/12] asm-generic: use asm-generic/unaligned.h for most architectures
2021-05-07 22:07 ` Arnd Bergmann
(?)
@ 2021-05-07 23:02 ` Thomas Gleixner
-1 siblings, 0 replies; 50+ messages in thread
From: Thomas Gleixner @ 2021-05-07 23:02 UTC (permalink / raw)
To: Arnd Bergmann, linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, Richard Henderson,
Ivan Kokshaysky, Matt Turner, Geert Uytterhoeven, Michal Simek,
James E.J. Bottomley, Helge Deller, David S. Miller, Ingo Molnar,
Borislav Petkov, x86, H. Peter Anvin, Chris Zankel, Max Filippov,
linux-alpha, linux-kernel, linux-ia64, linux-m68k, linux-parisc,
sparclinux, linux-xtensa
On Sat, May 08 2021 at 00:07, Arnd Bergmann wrote:
> diff --git a/arch/x86/include/asm/unaligned.h b/arch/x86/include/asm/unaligned.h
> deleted file mode 100644
> index 9c754a7447aa..000000000000
> --- a/arch/x86/include/asm/unaligned.h
> +++ /dev/null
> @@ -1,15 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0 */
> -#ifndef _ASM_X86_UNALIGNED_H
> -#define _ASM_X86_UNALIGNED_H
> -
> -/*
> - * The x86 can do unaligned accesses itself.
> - */
> -
> -#include <linux/unaligned/access_ok.h>
> -#include <linux/unaligned/generic.h>
> -
> -#define get_unaligned __get_unaligned_le
> -#define put_unaligned __put_unaligned_le
> -
> -#endif /* _ASM_X86_UNALIGNED_H */
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Thanks for cleaning that up!
tglx
^ permalink raw reply [flat|nested] 50+ messages in thread* Re: [RFC 01/12] asm-generic: use asm-generic/unaligned.h for most architectures
@ 2021-05-07 23:02 ` Thomas Gleixner
0 siblings, 0 replies; 50+ messages in thread
From: Thomas Gleixner @ 2021-05-07 23:02 UTC (permalink / raw)
To: Arnd Bergmann, linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, Richard Henderson,
Ivan Kokshaysky, Matt Turner, Geert Uytterhoeven, Michal Simek,
James E.J. Bottomley, Helge Deller, David S. Miller, Ingo Molnar,
Borislav Petkov, x86, H. Peter Anvin, Chris Zankel, Max Filippov,
linux-alpha, linux-kernel, linux-ia64, linux-m68k, linux-parisc
On Sat, May 08 2021 at 00:07, Arnd Bergmann wrote:
> diff --git a/arch/x86/include/asm/unaligned.h b/arch/x86/include/asm/unaligned.h
> deleted file mode 100644
> index 9c754a7447aa..000000000000
> --- a/arch/x86/include/asm/unaligned.h
> +++ /dev/null
> @@ -1,15 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0 */
> -#ifndef _ASM_X86_UNALIGNED_H
> -#define _ASM_X86_UNALIGNED_H
> -
> -/*
> - * The x86 can do unaligned accesses itself.
> - */
> -
> -#include <linux/unaligned/access_ok.h>
> -#include <linux/unaligned/generic.h>
> -
> -#define get_unaligned __get_unaligned_le
> -#define put_unaligned __put_unaligned_le
> -
> -#endif /* _ASM_X86_UNALIGNED_H */
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Thanks for cleaning that up!
tglx
^ permalink raw reply [flat|nested] 50+ messages in thread* Re: [RFC 01/12] asm-generic: use asm-generic/unaligned.h for most architectures
@ 2021-05-07 23:02 ` Thomas Gleixner
0 siblings, 0 replies; 50+ messages in thread
From: Thomas Gleixner @ 2021-05-07 23:02 UTC (permalink / raw)
To: Arnd Bergmann, linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, Richard Henderson,
Ivan Kokshaysky, Matt Turner, Geert Uytterhoeven, Michal Simek,
James E.J. Bottomley, Helge Deller, David S. Miller, Ingo Molnar,
Borislav Petkov, x86, H. Peter Anvin, Chris Zankel, Max Filippov,
linux-alpha, linux-kernel, linux-ia64, linux-m68k, linux-parisc,
sparclinux, linux-xtensa
On Sat, May 08 2021 at 00:07, Arnd Bergmann wrote:
> diff --git a/arch/x86/include/asm/unaligned.h b/arch/x86/include/asm/unaligned.h
> deleted file mode 100644
> index 9c754a7447aa..000000000000
> --- a/arch/x86/include/asm/unaligned.h
> +++ /dev/null
> @@ -1,15 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0 */
> -#ifndef _ASM_X86_UNALIGNED_H
> -#define _ASM_X86_UNALIGNED_H
> -
> -/*
> - * The x86 can do unaligned accesses itself.
> - */
> -
> -#include <linux/unaligned/access_ok.h>
> -#include <linux/unaligned/generic.h>
> -
> -#define get_unaligned __get_unaligned_le
> -#define put_unaligned __put_unaligned_le
> -
> -#endif /* _ASM_X86_UNALIGNED_H */
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Thanks for cleaning that up!
tglx
^ permalink raw reply [flat|nested] 50+ messages in thread
* Re: [RFC 01/12] asm-generic: use asm-generic/unaligned.h for most architectures
2021-05-07 22:07 ` Arnd Bergmann
(?)
@ 2021-05-10 10:16 ` Geert Uytterhoeven
-1 siblings, 0 replies; 50+ messages in thread
From: Geert Uytterhoeven @ 2021-05-10 10:16 UTC (permalink / raw)
To: Arnd Bergmann
Cc: Linux-Arch, Linus Torvalds, Vineet Gupta, Arnd Bergmann,
Richard Henderson, Ivan Kokshaysky, Matt Turner, Michal Simek,
James E.J. Bottomley, Helge Deller, David S. Miller,
Thomas Gleixner, Ingo Molnar, Borislav Petkov,
the arch/x86 maintainers, H. Peter Anvin, Chris Zankel,
Max Filippov, alpha, Linux Kernel Mailing List, linux-ia64,
linux-m68k, Parisc List, sparclinux,
open list:TENSILICA XTENSA PORT (xtensa)
Hi Arnd,
On Sat, May 8, 2021 at 12:09 AM Arnd Bergmann <arnd@kernel.org> wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> There are several architectures that just duplicate the contents
> of asm-generic/unaligned.h, so change those over to use the
> file directly, to make future modifications easier.
>
> The exceptions are:
>
> - arm32 sets HAVE_EFFICIENT_UNALIGNED_ACCESS, but wants the
> unaligned-struct version
>
> - ppc64le disables HAVE_EFFICIENT_UNALIGNED_ACCESS but includes
> the access-ok version
>
> - m68k (non-dragonball) also uses the access-ok version without
> setting HAVE_EFFICIENT_UNALIGNED_ACCESS.
This not only applies to dragonball, which has the CPU32 core, but also
to plain 68000, and any SoCs including the 68EC000 core.
It also applies to early Coldfire, but AFAIK Linux doesn't support these
(see dfe1d26d4a90287e ("m68knommu: Allow ColdFire CPUs to use unaligned
accesses")).
> - sh4a has a custom inline asm version
>
> - openrisc is the only one using the memmove version that
> generally leads to worse code.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> arch/m68k/include/asm/unaligned.h | 9 +-------
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply [flat|nested] 50+ messages in thread* Re: [RFC 01/12] asm-generic: use asm-generic/unaligned.h for most architectures
@ 2021-05-10 10:16 ` Geert Uytterhoeven
0 siblings, 0 replies; 50+ messages in thread
From: Geert Uytterhoeven @ 2021-05-10 10:16 UTC (permalink / raw)
To: Arnd Bergmann
Cc: Linux-Arch, Linus Torvalds, Vineet Gupta, Arnd Bergmann,
Richard Henderson, Ivan Kokshaysky, Matt Turner, Michal Simek,
James E.J. Bottomley, Helge Deller, David S. Miller,
Thomas Gleixner, Ingo Molnar, Borislav Petkov,
the arch/x86 maintainers, H. Peter Anvin, Chris Zankel,
Max Filippov, alpha, Linux Kernel Mailing List
Hi Arnd,
On Sat, May 8, 2021 at 12:09 AM Arnd Bergmann <arnd@kernel.org> wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> There are several architectures that just duplicate the contents
> of asm-generic/unaligned.h, so change those over to use the
> file directly, to make future modifications easier.
>
> The exceptions are:
>
> - arm32 sets HAVE_EFFICIENT_UNALIGNED_ACCESS, but wants the
> unaligned-struct version
>
> - ppc64le disables HAVE_EFFICIENT_UNALIGNED_ACCESS but includes
> the access-ok version
>
> - m68k (non-dragonball) also uses the access-ok version without
> setting HAVE_EFFICIENT_UNALIGNED_ACCESS.
This not only applies to dragonball, which has the CPU32 core, but also
to plain 68000, and any SoCs including the 68EC000 core.
It also applies to early Coldfire, but AFAIK Linux doesn't support these
(see dfe1d26d4a90287e ("m68knommu: Allow ColdFire CPUs to use unaligned
accesses")).
> - sh4a has a custom inline asm version
>
> - openrisc is the only one using the memmove version that
> generally leads to worse code.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> arch/m68k/include/asm/unaligned.h | 9 +-------
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply [flat|nested] 50+ messages in thread* Re: [RFC 01/12] asm-generic: use asm-generic/unaligned.h for most architectures
@ 2021-05-10 10:16 ` Geert Uytterhoeven
0 siblings, 0 replies; 50+ messages in thread
From: Geert Uytterhoeven @ 2021-05-10 10:16 UTC (permalink / raw)
To: Arnd Bergmann
Cc: Linux-Arch, Linus Torvalds, Vineet Gupta, Arnd Bergmann,
Richard Henderson, Ivan Kokshaysky, Matt Turner, Michal Simek,
James E.J. Bottomley, Helge Deller, David S. Miller,
Thomas Gleixner, Ingo Molnar, Borislav Petkov,
the arch/x86 maintainers, H. Peter Anvin, Chris Zankel,
Max Filippov, alpha, Linux Kernel Mailing List, linux-ia64,
linux-m68k, Parisc List, sparclinux,
open list:TENSILICA XTENSA PORT (xtensa)
Hi Arnd,
On Sat, May 8, 2021 at 12:09 AM Arnd Bergmann <arnd@kernel.org> wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> There are several architectures that just duplicate the contents
> of asm-generic/unaligned.h, so change those over to use the
> file directly, to make future modifications easier.
>
> The exceptions are:
>
> - arm32 sets HAVE_EFFICIENT_UNALIGNED_ACCESS, but wants the
> unaligned-struct version
>
> - ppc64le disables HAVE_EFFICIENT_UNALIGNED_ACCESS but includes
> the access-ok version
>
> - m68k (non-dragonball) also uses the access-ok version without
> setting HAVE_EFFICIENT_UNALIGNED_ACCESS.
This not only applies to dragonball, which has the CPU32 core, but also
to plain 68000, and any SoCs including the 68EC000 core.
It also applies to early Coldfire, but AFAIK Linux doesn't support these
(see dfe1d26d4a90287e ("m68knommu: Allow ColdFire CPUs to use unaligned
accesses")).
> - sh4a has a custom inline asm version
>
> - openrisc is the only one using the memmove version that
> generally leads to worse code.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> arch/m68k/include/asm/unaligned.h | 9 +-------
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply [flat|nested] 50+ messages in thread* Re: [RFC 01/12] asm-generic: use asm-generic/unaligned.h for most architectures
2021-05-10 10:16 ` Geert Uytterhoeven
(?)
@ 2021-05-10 13:12 ` Arnd Bergmann
-1 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-10 13:12 UTC (permalink / raw)
To: Geert Uytterhoeven
Cc: Linux-Arch, Linus Torvalds, Vineet Gupta, Richard Henderson,
Ivan Kokshaysky, Matt Turner, Michal Simek, James E.J. Bottomley,
Helge Deller, David S. Miller, Thomas Gleixner, Ingo Molnar,
Borislav Petkov, the arch/x86 maintainers, H. Peter Anvin,
Chris Zankel, Max Filippov, alpha, Linux Kernel Mailing List,
linux-ia64, linux-m68k, Parisc List, sparclinux,
open list:TENSILICA XTENSA PORT (xtensa)
On Mon, May 10, 2021 at 12:16 PM Geert Uytterhoeven
<geert@linux-m68k.org> wrote:
> On Sat, May 8, 2021 at 12:09 AM Arnd Bergmann <arnd@kernel.org> wrote:
> > From: Arnd Bergmann <arnd@arndb.de>
> >
> > There are several architectures that just duplicate the contents
> > of asm-generic/unaligned.h, so change those over to use the
> > file directly, to make future modifications easier.
> >
> > The exceptions are:
> >
> > - arm32 sets HAVE_EFFICIENT_UNALIGNED_ACCESS, but wants the
> > unaligned-struct version
> >
> > - ppc64le disables HAVE_EFFICIENT_UNALIGNED_ACCESS but includes
> > the access-ok version
> >
> > - m68k (non-dragonball) also uses the access-ok version without
> > setting HAVE_EFFICIENT_UNALIGNED_ACCESS.
>
> This not only applies to dragonball, which has the CPU32 core, but also
> to plain 68000, and any SoCs including the 68EC000 core.
I meant out of the machines that are currently supported in the kernel.
As far as I can tell, the only 68000 variants that are supported are
all Dragonball CONFIG_M68328, CONFIG_M68EZ328 and
CONFIG_M68VZ328.
CONFIG_MCPU32 has been dead since a3595962d824 ("m68knommu:
remove obsolete 68360 support")
> Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Thanks!
Arnd
^ permalink raw reply [flat|nested] 50+ messages in thread* Re: [RFC 01/12] asm-generic: use asm-generic/unaligned.h for most architectures
@ 2021-05-10 13:12 ` Arnd Bergmann
0 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-10 13:12 UTC (permalink / raw)
To: Geert Uytterhoeven
Cc: Linux-Arch, Linus Torvalds, Vineet Gupta, Richard Henderson,
Ivan Kokshaysky, Matt Turner, Michal Simek, James E.J. Bottomley,
Helge Deller, David S. Miller, Thomas Gleixner, Ingo Molnar,
Borislav Petkov, the arch/x86 maintainers, H. Peter Anvin,
Chris Zankel, Max Filippov, alpha, Linux Kernel Mailing List,
linux-i
On Mon, May 10, 2021 at 12:16 PM Geert Uytterhoeven
<geert@linux-m68k.org> wrote:
> On Sat, May 8, 2021 at 12:09 AM Arnd Bergmann <arnd@kernel.org> wrote:
> > From: Arnd Bergmann <arnd@arndb.de>
> >
> > There are several architectures that just duplicate the contents
> > of asm-generic/unaligned.h, so change those over to use the
> > file directly, to make future modifications easier.
> >
> > The exceptions are:
> >
> > - arm32 sets HAVE_EFFICIENT_UNALIGNED_ACCESS, but wants the
> > unaligned-struct version
> >
> > - ppc64le disables HAVE_EFFICIENT_UNALIGNED_ACCESS but includes
> > the access-ok version
> >
> > - m68k (non-dragonball) also uses the access-ok version without
> > setting HAVE_EFFICIENT_UNALIGNED_ACCESS.
>
> This not only applies to dragonball, which has the CPU32 core, but also
> to plain 68000, and any SoCs including the 68EC000 core.
I meant out of the machines that are currently supported in the kernel.
As far as I can tell, the only 68000 variants that are supported are
all Dragonball CONFIG_M68328, CONFIG_M68EZ328 and
CONFIG_M68VZ328.
CONFIG_MCPU32 has been dead since a3595962d824 ("m68knommu:
remove obsolete 68360 support")
> Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Thanks!
Arnd
^ permalink raw reply [flat|nested] 50+ messages in thread* Re: [RFC 01/12] asm-generic: use asm-generic/unaligned.h for most architectures
@ 2021-05-10 13:12 ` Arnd Bergmann
0 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-10 13:12 UTC (permalink / raw)
To: Geert Uytterhoeven
Cc: Linux-Arch, Linus Torvalds, Vineet Gupta, Richard Henderson,
Ivan Kokshaysky, Matt Turner, Michal Simek, James E.J. Bottomley,
Helge Deller, David S. Miller, Thomas Gleixner, Ingo Molnar,
Borislav Petkov, the arch/x86 maintainers, H. Peter Anvin,
Chris Zankel, Max Filippov, alpha, Linux Kernel Mailing List,
linux-ia64, linux-m68k, Parisc List, sparclinux,
open list:TENSILICA XTENSA PORT (xtensa)
On Mon, May 10, 2021 at 12:16 PM Geert Uytterhoeven
<geert@linux-m68k.org> wrote:
> On Sat, May 8, 2021 at 12:09 AM Arnd Bergmann <arnd@kernel.org> wrote:
> > From: Arnd Bergmann <arnd@arndb.de>
> >
> > There are several architectures that just duplicate the contents
> > of asm-generic/unaligned.h, so change those over to use the
> > file directly, to make future modifications easier.
> >
> > The exceptions are:
> >
> > - arm32 sets HAVE_EFFICIENT_UNALIGNED_ACCESS, but wants the
> > unaligned-struct version
> >
> > - ppc64le disables HAVE_EFFICIENT_UNALIGNED_ACCESS but includes
> > the access-ok version
> >
> > - m68k (non-dragonball) also uses the access-ok version without
> > setting HAVE_EFFICIENT_UNALIGNED_ACCESS.
>
> This not only applies to dragonball, which has the CPU32 core, but also
> to plain 68000, and any SoCs including the 68EC000 core.
I meant out of the machines that are currently supported in the kernel.
As far as I can tell, the only 68000 variants that are supported are
all Dragonball CONFIG_M68328, CONFIG_M68EZ328 and
CONFIG_M68VZ328.
CONFIG_MCPU32 has been dead since a3595962d824 ("m68knommu:
remove obsolete 68360 support")
> Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Thanks!
Arnd
^ permalink raw reply [flat|nested] 50+ messages in thread
* [RFC 02/12] openrisc: always use unaligned-struct header
2021-05-07 22:07 ` Arnd Bergmann
@ 2021-05-07 22:07 ` Arnd Bergmann
-1 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, Jonas Bonn,
Stefan Kristiansson, Stafford Horne, openrisc, linux-kernel
From: Arnd Bergmann <arnd@arndb.de>
openrisc is the only architecture using the linux/unaligned/*memmove
infrastructure. There is a comment saying that this version is more
efficient, but this was added in 2011 before the openrisc gcc port
was merged upstream.
I checked a couple of files to see what the actual difference is with
the mainline gcc (9.4 and 11.1), and found that the generic header
seems to produce better code now, regardless of the gcc version.
Specifically, the be_memmove leads to allocating a stack slot and
copying the data one byte at a time, then reading the whole word
from the stack:
00000000 <test_get_unaligned_memmove>:
0: 9c 21 ff f4 l.addi r1,r1,-12
4: d4 01 10 04 l.sw 4(r1),r2
8: 8e 63 00 00 l.lbz r19,0(r3)
c: 9c 41 00 0c l.addi r2,r1,12
10: 8e 23 00 01 l.lbz r17,1(r3)
14: db e2 9f f4 l.sb -12(r2),r19
18: db e2 8f f5 l.sb -11(r2),r17
1c: 8e 63 00 02 l.lbz r19,2(r3)
20: 8e 23 00 03 l.lbz r17,3(r3)
24: d4 01 48 08 l.sw 8(r1),r9
28: db e2 9f f6 l.sb -10(r2),r19
2c: db e2 8f f7 l.sb -9(r2),r17
30: 85 62 ff f4 l.lwz r11,-12(r2)
34: 85 21 00 08 l.lwz r9,8(r1)
38: 84 41 00 04 l.lwz r2,4(r1)
3c: 44 00 48 00 l.jr r9
40: 9c 21 00 0c l.addi r1,r1,12
while the be_struct version reads each byte into a register
and does a shift to the right position:
00000000 <test_get_unaligned_struct>:
0: 9c 21 ff f8 l.addi r1,r1,-8
4: 8e 63 00 00 l.lbz r19,0(r3)
8: aa 20 00 18 l.ori r17,r0,0x18
c: e2 73 88 08 l.sll r19,r19,r17
10: 8d 63 00 01 l.lbz r11,1(r3)
14: aa 20 00 10 l.ori r17,r0,0x10
18: e1 6b 88 08 l.sll r11,r11,r17
1c: e1 6b 98 04 l.or r11,r11,r19
20: 8e 23 00 02 l.lbz r17,2(r3)
24: aa 60 00 08 l.ori r19,r0,0x8
28: e2 31 98 08 l.sll r17,r17,r19
2c: d4 01 10 00 l.sw 0(r1),r2
30: d4 01 48 04 l.sw 4(r1),r9
34: 9c 41 00 08 l.addi r2,r1,8
38: e2 31 58 04 l.or r17,r17,r11
3c: 8d 63 00 03 l.lbz r11,3(r3)
40: e1 6b 88 04 l.or r11,r11,r17
44: 84 41 00 00 l.lwz r2,0(r1)
48: 85 21 00 04 l.lwz r9,4(r1)
4c: 44 00 48 00 l.jr r9
50: 9c 21 00 08 l.addi r1,r1,8
I don't know how the loads/store perform compared to the shift version
on a particular microarchitecture, but my guess is that the shifts
are better.
In the trivial example, the struct version is a few instructions longer,
but building a whole kernel shows an overall reduction in code size,
presumably because it now has to manage fewer stack slots:
text data bss dec hex filename
4792010 181480 82324 5055814 4d2546 vmlinux-unaligned-memmove
4790642 181480 82324 5054446 4d1fee vmlinux-unaligned-struct
Remove the memmove version completely and let openrisc use the same
code as everyone else, as a simplification.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/openrisc/include/asm/unaligned.h | 47 ---------------------------
include/linux/unaligned/be_memmove.h | 37 ---------------------
include/linux/unaligned/le_memmove.h | 37 ---------------------
include/linux/unaligned/memmove.h | 46 --------------------------
4 files changed, 167 deletions(-)
delete mode 100644 arch/openrisc/include/asm/unaligned.h
delete mode 100644 include/linux/unaligned/be_memmove.h
delete mode 100644 include/linux/unaligned/le_memmove.h
delete mode 100644 include/linux/unaligned/memmove.h
diff --git a/arch/openrisc/include/asm/unaligned.h b/arch/openrisc/include/asm/unaligned.h
deleted file mode 100644
index 14353f2101f2..000000000000
--- a/arch/openrisc/include/asm/unaligned.h
+++ /dev/null
@@ -1,47 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- * OpenRISC Linux
- *
- * Linux architectural port borrowing liberally from similar works of
- * others. All original copyrights apply as per the original source
- * declaration.
- *
- * OpenRISC implementation:
- * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
- * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
- * et al.
- */
-
-#ifndef __ASM_OPENRISC_UNALIGNED_H
-#define __ASM_OPENRISC_UNALIGNED_H
-
-/*
- * This is copied from the generic implementation and the C-struct
- * variant replaced with the memmove variant. The GCC compiler
- * for the OR32 arch optimizes too aggressively for the C-struct
- * variant to work, so use the memmove variant instead.
- *
- * It may be worth considering implementing the unaligned access
- * exception handler and allowing unaligned accesses (access_ok.h)...
- * not sure if it would be much of a performance win without further
- * investigation.
- */
-#include <asm/byteorder.h>
-
-#if defined(__LITTLE_ENDIAN)
-# include <linux/unaligned/le_memmove.h>
-# include <linux/unaligned/be_byteshift.h>
-# include <linux/unaligned/generic.h>
-# define get_unaligned __get_unaligned_le
-# define put_unaligned __put_unaligned_le
-#elif defined(__BIG_ENDIAN)
-# include <linux/unaligned/be_memmove.h>
-# include <linux/unaligned/le_byteshift.h>
-# include <linux/unaligned/generic.h>
-# define get_unaligned __get_unaligned_be
-# define put_unaligned __put_unaligned_be
-#else
-# error need to define endianess
-#endif
-
-#endif /* __ASM_OPENRISC_UNALIGNED_H */
diff --git a/include/linux/unaligned/be_memmove.h b/include/linux/unaligned/be_memmove.h
deleted file mode 100644
index 7164214a4ba1..000000000000
--- a/include/linux/unaligned/be_memmove.h
+++ /dev/null
@@ -1,37 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_UNALIGNED_BE_MEMMOVE_H
-#define _LINUX_UNALIGNED_BE_MEMMOVE_H
-
-#include <linux/unaligned/memmove.h>
-
-static inline u16 get_unaligned_be16(const void *p)
-{
- return __get_unaligned_memmove16((const u8 *)p);
-}
-
-static inline u32 get_unaligned_be32(const void *p)
-{
- return __get_unaligned_memmove32((const u8 *)p);
-}
-
-static inline u64 get_unaligned_be64(const void *p)
-{
- return __get_unaligned_memmove64((const u8 *)p);
-}
-
-static inline void put_unaligned_be16(u16 val, void *p)
-{
- __put_unaligned_memmove16(val, p);
-}
-
-static inline void put_unaligned_be32(u32 val, void *p)
-{
- __put_unaligned_memmove32(val, p);
-}
-
-static inline void put_unaligned_be64(u64 val, void *p)
-{
- __put_unaligned_memmove64(val, p);
-}
-
-#endif /* _LINUX_UNALIGNED_LE_MEMMOVE_H */
diff --git a/include/linux/unaligned/le_memmove.h b/include/linux/unaligned/le_memmove.h
deleted file mode 100644
index 9202e864d026..000000000000
--- a/include/linux/unaligned/le_memmove.h
+++ /dev/null
@@ -1,37 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_UNALIGNED_LE_MEMMOVE_H
-#define _LINUX_UNALIGNED_LE_MEMMOVE_H
-
-#include <linux/unaligned/memmove.h>
-
-static inline u16 get_unaligned_le16(const void *p)
-{
- return __get_unaligned_memmove16((const u8 *)p);
-}
-
-static inline u32 get_unaligned_le32(const void *p)
-{
- return __get_unaligned_memmove32((const u8 *)p);
-}
-
-static inline u64 get_unaligned_le64(const void *p)
-{
- return __get_unaligned_memmove64((const u8 *)p);
-}
-
-static inline void put_unaligned_le16(u16 val, void *p)
-{
- __put_unaligned_memmove16(val, p);
-}
-
-static inline void put_unaligned_le32(u32 val, void *p)
-{
- __put_unaligned_memmove32(val, p);
-}
-
-static inline void put_unaligned_le64(u64 val, void *p)
-{
- __put_unaligned_memmove64(val, p);
-}
-
-#endif /* _LINUX_UNALIGNED_LE_MEMMOVE_H */
diff --git a/include/linux/unaligned/memmove.h b/include/linux/unaligned/memmove.h
deleted file mode 100644
index ac71b53bc6dc..000000000000
--- a/include/linux/unaligned/memmove.h
+++ /dev/null
@@ -1,46 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_UNALIGNED_MEMMOVE_H
-#define _LINUX_UNALIGNED_MEMMOVE_H
-
-#include <linux/kernel.h>
-#include <linux/string.h>
-
-/* Use memmove here, so gcc does not insert a __builtin_memcpy. */
-
-static inline u16 __get_unaligned_memmove16(const void *p)
-{
- u16 tmp;
- memmove(&tmp, p, 2);
- return tmp;
-}
-
-static inline u32 __get_unaligned_memmove32(const void *p)
-{
- u32 tmp;
- memmove(&tmp, p, 4);
- return tmp;
-}
-
-static inline u64 __get_unaligned_memmove64(const void *p)
-{
- u64 tmp;
- memmove(&tmp, p, 8);
- return tmp;
-}
-
-static inline void __put_unaligned_memmove16(u16 val, void *p)
-{
- memmove(p, &val, 2);
-}
-
-static inline void __put_unaligned_memmove32(u32 val, void *p)
-{
- memmove(p, &val, 4);
-}
-
-static inline void __put_unaligned_memmove64(u64 val, void *p)
-{
- memmove(p, &val, 8);
-}
-
-#endif /* _LINUX_UNALIGNED_MEMMOVE_H */
--
2.29.2
^ permalink raw reply related [flat|nested] 50+ messages in thread* [OpenRISC] [RFC 02/12] openrisc: always use unaligned-struct header
@ 2021-05-07 22:07 ` Arnd Bergmann
0 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: openrisc
From: Arnd Bergmann <arnd@arndb.de>
openrisc is the only architecture using the linux/unaligned/*memmove
infrastructure. There is a comment saying that this version is more
efficient, but this was added in 2011 before the openrisc gcc port
was merged upstream.
I checked a couple of files to see what the actual difference is with
the mainline gcc (9.4 and 11.1), and found that the generic header
seems to produce better code now, regardless of the gcc version.
Specifically, the be_memmove leads to allocating a stack slot and
copying the data one byte at a time, then reading the whole word
from the stack:
00000000 <test_get_unaligned_memmove>:
0: 9c 21 ff f4 l.addi r1,r1,-12
4: d4 01 10 04 l.sw 4(r1),r2
8: 8e 63 00 00 l.lbz r19,0(r3)
c: 9c 41 00 0c l.addi r2,r1,12
10: 8e 23 00 01 l.lbz r17,1(r3)
14: db e2 9f f4 l.sb -12(r2),r19
18: db e2 8f f5 l.sb -11(r2),r17
1c: 8e 63 00 02 l.lbz r19,2(r3)
20: 8e 23 00 03 l.lbz r17,3(r3)
24: d4 01 48 08 l.sw 8(r1),r9
28: db e2 9f f6 l.sb -10(r2),r19
2c: db e2 8f f7 l.sb -9(r2),r17
30: 85 62 ff f4 l.lwz r11,-12(r2)
34: 85 21 00 08 l.lwz r9,8(r1)
38: 84 41 00 04 l.lwz r2,4(r1)
3c: 44 00 48 00 l.jr r9
40: 9c 21 00 0c l.addi r1,r1,12
while the be_struct version reads each byte into a register
and does a shift to the right position:
00000000 <test_get_unaligned_struct>:
0: 9c 21 ff f8 l.addi r1,r1,-8
4: 8e 63 00 00 l.lbz r19,0(r3)
8: aa 20 00 18 l.ori r17,r0,0x18
c: e2 73 88 08 l.sll r19,r19,r17
10: 8d 63 00 01 l.lbz r11,1(r3)
14: aa 20 00 10 l.ori r17,r0,0x10
18: e1 6b 88 08 l.sll r11,r11,r17
1c: e1 6b 98 04 l.or r11,r11,r19
20: 8e 23 00 02 l.lbz r17,2(r3)
24: aa 60 00 08 l.ori r19,r0,0x8
28: e2 31 98 08 l.sll r17,r17,r19
2c: d4 01 10 00 l.sw 0(r1),r2
30: d4 01 48 04 l.sw 4(r1),r9
34: 9c 41 00 08 l.addi r2,r1,8
38: e2 31 58 04 l.or r17,r17,r11
3c: 8d 63 00 03 l.lbz r11,3(r3)
40: e1 6b 88 04 l.or r11,r11,r17
44: 84 41 00 00 l.lwz r2,0(r1)
48: 85 21 00 04 l.lwz r9,4(r1)
4c: 44 00 48 00 l.jr r9
50: 9c 21 00 08 l.addi r1,r1,8
I don't know how the loads/store perform compared to the shift version
on a particular microarchitecture, but my guess is that the shifts
are better.
In the trivial example, the struct version is a few instructions longer,
but building a whole kernel shows an overall reduction in code size,
presumably because it now has to manage fewer stack slots:
text data bss dec hex filename
4792010 181480 82324 5055814 4d2546 vmlinux-unaligned-memmove
4790642 181480 82324 5054446 4d1fee vmlinux-unaligned-struct
Remove the memmove version completely and let openrisc use the same
code as everyone else, as a simplification.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/openrisc/include/asm/unaligned.h | 47 ---------------------------
include/linux/unaligned/be_memmove.h | 37 ---------------------
include/linux/unaligned/le_memmove.h | 37 ---------------------
include/linux/unaligned/memmove.h | 46 --------------------------
4 files changed, 167 deletions(-)
delete mode 100644 arch/openrisc/include/asm/unaligned.h
delete mode 100644 include/linux/unaligned/be_memmove.h
delete mode 100644 include/linux/unaligned/le_memmove.h
delete mode 100644 include/linux/unaligned/memmove.h
diff --git a/arch/openrisc/include/asm/unaligned.h b/arch/openrisc/include/asm/unaligned.h
deleted file mode 100644
index 14353f2101f2..000000000000
--- a/arch/openrisc/include/asm/unaligned.h
+++ /dev/null
@@ -1,47 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- * OpenRISC Linux
- *
- * Linux architectural port borrowing liberally from similar works of
- * others. All original copyrights apply as per the original source
- * declaration.
- *
- * OpenRISC implementation:
- * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
- * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
- * et al.
- */
-
-#ifndef __ASM_OPENRISC_UNALIGNED_H
-#define __ASM_OPENRISC_UNALIGNED_H
-
-/*
- * This is copied from the generic implementation and the C-struct
- * variant replaced with the memmove variant. The GCC compiler
- * for the OR32 arch optimizes too aggressively for the C-struct
- * variant to work, so use the memmove variant instead.
- *
- * It may be worth considering implementing the unaligned access
- * exception handler and allowing unaligned accesses (access_ok.h)...
- * not sure if it would be much of a performance win without further
- * investigation.
- */
-#include <asm/byteorder.h>
-
-#if defined(__LITTLE_ENDIAN)
-# include <linux/unaligned/le_memmove.h>
-# include <linux/unaligned/be_byteshift.h>
-# include <linux/unaligned/generic.h>
-# define get_unaligned __get_unaligned_le
-# define put_unaligned __put_unaligned_le
-#elif defined(__BIG_ENDIAN)
-# include <linux/unaligned/be_memmove.h>
-# include <linux/unaligned/le_byteshift.h>
-# include <linux/unaligned/generic.h>
-# define get_unaligned __get_unaligned_be
-# define put_unaligned __put_unaligned_be
-#else
-# error need to define endianess
-#endif
-
-#endif /* __ASM_OPENRISC_UNALIGNED_H */
diff --git a/include/linux/unaligned/be_memmove.h b/include/linux/unaligned/be_memmove.h
deleted file mode 100644
index 7164214a4ba1..000000000000
--- a/include/linux/unaligned/be_memmove.h
+++ /dev/null
@@ -1,37 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_UNALIGNED_BE_MEMMOVE_H
-#define _LINUX_UNALIGNED_BE_MEMMOVE_H
-
-#include <linux/unaligned/memmove.h>
-
-static inline u16 get_unaligned_be16(const void *p)
-{
- return __get_unaligned_memmove16((const u8 *)p);
-}
-
-static inline u32 get_unaligned_be32(const void *p)
-{
- return __get_unaligned_memmove32((const u8 *)p);
-}
-
-static inline u64 get_unaligned_be64(const void *p)
-{
- return __get_unaligned_memmove64((const u8 *)p);
-}
-
-static inline void put_unaligned_be16(u16 val, void *p)
-{
- __put_unaligned_memmove16(val, p);
-}
-
-static inline void put_unaligned_be32(u32 val, void *p)
-{
- __put_unaligned_memmove32(val, p);
-}
-
-static inline void put_unaligned_be64(u64 val, void *p)
-{
- __put_unaligned_memmove64(val, p);
-}
-
-#endif /* _LINUX_UNALIGNED_LE_MEMMOVE_H */
diff --git a/include/linux/unaligned/le_memmove.h b/include/linux/unaligned/le_memmove.h
deleted file mode 100644
index 9202e864d026..000000000000
--- a/include/linux/unaligned/le_memmove.h
+++ /dev/null
@@ -1,37 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_UNALIGNED_LE_MEMMOVE_H
-#define _LINUX_UNALIGNED_LE_MEMMOVE_H
-
-#include <linux/unaligned/memmove.h>
-
-static inline u16 get_unaligned_le16(const void *p)
-{
- return __get_unaligned_memmove16((const u8 *)p);
-}
-
-static inline u32 get_unaligned_le32(const void *p)
-{
- return __get_unaligned_memmove32((const u8 *)p);
-}
-
-static inline u64 get_unaligned_le64(const void *p)
-{
- return __get_unaligned_memmove64((const u8 *)p);
-}
-
-static inline void put_unaligned_le16(u16 val, void *p)
-{
- __put_unaligned_memmove16(val, p);
-}
-
-static inline void put_unaligned_le32(u32 val, void *p)
-{
- __put_unaligned_memmove32(val, p);
-}
-
-static inline void put_unaligned_le64(u64 val, void *p)
-{
- __put_unaligned_memmove64(val, p);
-}
-
-#endif /* _LINUX_UNALIGNED_LE_MEMMOVE_H */
diff --git a/include/linux/unaligned/memmove.h b/include/linux/unaligned/memmove.h
deleted file mode 100644
index ac71b53bc6dc..000000000000
--- a/include/linux/unaligned/memmove.h
+++ /dev/null
@@ -1,46 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_UNALIGNED_MEMMOVE_H
-#define _LINUX_UNALIGNED_MEMMOVE_H
-
-#include <linux/kernel.h>
-#include <linux/string.h>
-
-/* Use memmove here, so gcc does not insert a __builtin_memcpy. */
-
-static inline u16 __get_unaligned_memmove16(const void *p)
-{
- u16 tmp;
- memmove(&tmp, p, 2);
- return tmp;
-}
-
-static inline u32 __get_unaligned_memmove32(const void *p)
-{
- u32 tmp;
- memmove(&tmp, p, 4);
- return tmp;
-}
-
-static inline u64 __get_unaligned_memmove64(const void *p)
-{
- u64 tmp;
- memmove(&tmp, p, 8);
- return tmp;
-}
-
-static inline void __put_unaligned_memmove16(u16 val, void *p)
-{
- memmove(p, &val, 2);
-}
-
-static inline void __put_unaligned_memmove32(u32 val, void *p)
-{
- memmove(p, &val, 4);
-}
-
-static inline void __put_unaligned_memmove64(u64 val, void *p)
-{
- memmove(p, &val, 8);
-}
-
-#endif /* _LINUX_UNALIGNED_MEMMOVE_H */
--
2.29.2
^ permalink raw reply related [flat|nested] 50+ messages in thread* Re: [RFC 02/12] openrisc: always use unaligned-struct header
2021-05-07 22:07 ` [OpenRISC] " Arnd Bergmann
@ 2021-05-07 23:02 ` Stafford Horne
-1 siblings, 0 replies; 50+ messages in thread
From: Stafford Horne @ 2021-05-07 23:02 UTC (permalink / raw)
To: Arnd Bergmann
Cc: linux-arch, Linus Torvalds, Vineet Gupta, Arnd Bergmann,
Jonas Bonn, Stefan Kristiansson, Openrisc,
Linux-Kernel@Vger. Kernel. Org
On Sat, May 8, 2021 at 7:10 AM Arnd Bergmann <arnd@kernel.org> wrote:
>
> From: Arnd Bergmann <arnd@arndb.de>
>
> openrisc is the only architecture using the linux/unaligned/*memmove
> infrastructure. There is a comment saying that this version is more
> efficient, but this was added in 2011 before the openrisc gcc port
> was merged upstream.
>
> I checked a couple of files to see what the actual difference is with
> the mainline gcc (9.4 and 11.1), and found that the generic header
> seems to produce better code now, regardless of the gcc version.
>
> Specifically, the be_memmove leads to allocating a stack slot and
> copying the data one byte at a time, then reading the whole word
> from the stack:
>
> 00000000 <test_get_unaligned_memmove>:
> 0: 9c 21 ff f4 l.addi r1,r1,-12
> 4: d4 01 10 04 l.sw 4(r1),r2
> 8: 8e 63 00 00 l.lbz r19,0(r3)
> c: 9c 41 00 0c l.addi r2,r1,12
> 10: 8e 23 00 01 l.lbz r17,1(r3)
> 14: db e2 9f f4 l.sb -12(r2),r19
> 18: db e2 8f f5 l.sb -11(r2),r17
> 1c: 8e 63 00 02 l.lbz r19,2(r3)
> 20: 8e 23 00 03 l.lbz r17,3(r3)
> 24: d4 01 48 08 l.sw 8(r1),r9
> 28: db e2 9f f6 l.sb -10(r2),r19
> 2c: db e2 8f f7 l.sb -9(r2),r17
> 30: 85 62 ff f4 l.lwz r11,-12(r2)
> 34: 85 21 00 08 l.lwz r9,8(r1)
> 38: 84 41 00 04 l.lwz r2,4(r1)
> 3c: 44 00 48 00 l.jr r9
> 40: 9c 21 00 0c l.addi r1,r1,12
>
> while the be_struct version reads each byte into a register
> and does a shift to the right position:
>
> 00000000 <test_get_unaligned_struct>:
> 0: 9c 21 ff f8 l.addi r1,r1,-8
> 4: 8e 63 00 00 l.lbz r19,0(r3)
> 8: aa 20 00 18 l.ori r17,r0,0x18
> c: e2 73 88 08 l.sll r19,r19,r17
> 10: 8d 63 00 01 l.lbz r11,1(r3)
> 14: aa 20 00 10 l.ori r17,r0,0x10
> 18: e1 6b 88 08 l.sll r11,r11,r17
> 1c: e1 6b 98 04 l.or r11,r11,r19
> 20: 8e 23 00 02 l.lbz r17,2(r3)
> 24: aa 60 00 08 l.ori r19,r0,0x8
> 28: e2 31 98 08 l.sll r17,r17,r19
> 2c: d4 01 10 00 l.sw 0(r1),r2
> 30: d4 01 48 04 l.sw 4(r1),r9
> 34: 9c 41 00 08 l.addi r2,r1,8
> 38: e2 31 58 04 l.or r17,r17,r11
> 3c: 8d 63 00 03 l.lbz r11,3(r3)
> 40: e1 6b 88 04 l.or r11,r11,r17
> 44: 84 41 00 00 l.lwz r2,0(r1)
> 48: 85 21 00 04 l.lwz r9,4(r1)
> 4c: 44 00 48 00 l.jr r9
> 50: 9c 21 00 08 l.addi r1,r1,8
>
> I don't know how the loads/store perform compared to the shift version
> on a particular microarchitecture, but my guess is that the shifts
> are better.
Thanks for doing the investigation on this as well.
Load stores are slow like on most architectures. WIth caching it will
be faster, but
still not faster than the shifts. So this looks good to me.
> In the trivial example, the struct version is a few instructions longer,
> but building a whole kernel shows an overall reduction in code size,
> presumably because it now has to manage fewer stack slots:
>
> text data bss dec hex filename
> 4792010 181480 82324 5055814 4d2546 vmlinux-unaligned-memmove
> 4790642 181480 82324 5054446 4d1fee vmlinux-unaligned-struct
That's a plus.
> Remove the memmove version completely and let openrisc use the same
> code as everyone else, as a simplification.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Stafford Horne <shorne@gmail.com>
> ---
> arch/openrisc/include/asm/unaligned.h | 47 ---------------------------
> include/linux/unaligned/be_memmove.h | 37 ---------------------
> include/linux/unaligned/le_memmove.h | 37 ---------------------
> include/linux/unaligned/memmove.h | 46 --------------------------
> 4 files changed, 167 deletions(-)
> delete mode 100644 arch/openrisc/include/asm/unaligned.h
> delete mode 100644 include/linux/unaligned/be_memmove.h
> delete mode 100644 include/linux/unaligned/le_memmove.h
> delete mode 100644 include/linux/unaligned/memmove.h
Thanks again,
-Stafford
^ permalink raw reply [flat|nested] 50+ messages in thread
* [OpenRISC] [RFC 02/12] openrisc: always use unaligned-struct header
@ 2021-05-07 23:02 ` Stafford Horne
0 siblings, 0 replies; 50+ messages in thread
From: Stafford Horne @ 2021-05-07 23:02 UTC (permalink / raw)
To: openrisc
On Sat, May 8, 2021 at 7:10 AM Arnd Bergmann <arnd@kernel.org> wrote:
>
> From: Arnd Bergmann <arnd@arndb.de>
>
> openrisc is the only architecture using the linux/unaligned/*memmove
> infrastructure. There is a comment saying that this version is more
> efficient, but this was added in 2011 before the openrisc gcc port
> was merged upstream.
>
> I checked a couple of files to see what the actual difference is with
> the mainline gcc (9.4 and 11.1), and found that the generic header
> seems to produce better code now, regardless of the gcc version.
>
> Specifically, the be_memmove leads to allocating a stack slot and
> copying the data one byte at a time, then reading the whole word
> from the stack:
>
> 00000000 <test_get_unaligned_memmove>:
> 0: 9c 21 ff f4 l.addi r1,r1,-12
> 4: d4 01 10 04 l.sw 4(r1),r2
> 8: 8e 63 00 00 l.lbz r19,0(r3)
> c: 9c 41 00 0c l.addi r2,r1,12
> 10: 8e 23 00 01 l.lbz r17,1(r3)
> 14: db e2 9f f4 l.sb -12(r2),r19
> 18: db e2 8f f5 l.sb -11(r2),r17
> 1c: 8e 63 00 02 l.lbz r19,2(r3)
> 20: 8e 23 00 03 l.lbz r17,3(r3)
> 24: d4 01 48 08 l.sw 8(r1),r9
> 28: db e2 9f f6 l.sb -10(r2),r19
> 2c: db e2 8f f7 l.sb -9(r2),r17
> 30: 85 62 ff f4 l.lwz r11,-12(r2)
> 34: 85 21 00 08 l.lwz r9,8(r1)
> 38: 84 41 00 04 l.lwz r2,4(r1)
> 3c: 44 00 48 00 l.jr r9
> 40: 9c 21 00 0c l.addi r1,r1,12
>
> while the be_struct version reads each byte into a register
> and does a shift to the right position:
>
> 00000000 <test_get_unaligned_struct>:
> 0: 9c 21 ff f8 l.addi r1,r1,-8
> 4: 8e 63 00 00 l.lbz r19,0(r3)
> 8: aa 20 00 18 l.ori r17,r0,0x18
> c: e2 73 88 08 l.sll r19,r19,r17
> 10: 8d 63 00 01 l.lbz r11,1(r3)
> 14: aa 20 00 10 l.ori r17,r0,0x10
> 18: e1 6b 88 08 l.sll r11,r11,r17
> 1c: e1 6b 98 04 l.or r11,r11,r19
> 20: 8e 23 00 02 l.lbz r17,2(r3)
> 24: aa 60 00 08 l.ori r19,r0,0x8
> 28: e2 31 98 08 l.sll r17,r17,r19
> 2c: d4 01 10 00 l.sw 0(r1),r2
> 30: d4 01 48 04 l.sw 4(r1),r9
> 34: 9c 41 00 08 l.addi r2,r1,8
> 38: e2 31 58 04 l.or r17,r17,r11
> 3c: 8d 63 00 03 l.lbz r11,3(r3)
> 40: e1 6b 88 04 l.or r11,r11,r17
> 44: 84 41 00 00 l.lwz r2,0(r1)
> 48: 85 21 00 04 l.lwz r9,4(r1)
> 4c: 44 00 48 00 l.jr r9
> 50: 9c 21 00 08 l.addi r1,r1,8
>
> I don't know how the loads/store perform compared to the shift version
> on a particular microarchitecture, but my guess is that the shifts
> are better.
Thanks for doing the investigation on this as well.
Load stores are slow like on most architectures. WIth caching it will
be faster, but
still not faster than the shifts. So this looks good to me.
> In the trivial example, the struct version is a few instructions longer,
> but building a whole kernel shows an overall reduction in code size,
> presumably because it now has to manage fewer stack slots:
>
> text data bss dec hex filename
> 4792010 181480 82324 5055814 4d2546 vmlinux-unaligned-memmove
> 4790642 181480 82324 5054446 4d1fee vmlinux-unaligned-struct
That's a plus.
> Remove the memmove version completely and let openrisc use the same
> code as everyone else, as a simplification.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Stafford Horne <shorne@gmail.com>
> ---
> arch/openrisc/include/asm/unaligned.h | 47 ---------------------------
> include/linux/unaligned/be_memmove.h | 37 ---------------------
> include/linux/unaligned/le_memmove.h | 37 ---------------------
> include/linux/unaligned/memmove.h | 46 --------------------------
> 4 files changed, 167 deletions(-)
> delete mode 100644 arch/openrisc/include/asm/unaligned.h
> delete mode 100644 include/linux/unaligned/be_memmove.h
> delete mode 100644 include/linux/unaligned/le_memmove.h
> delete mode 100644 include/linux/unaligned/memmove.h
Thanks again,
-Stafford
^ permalink raw reply [flat|nested] 50+ messages in thread
* RE: [RFC 02/12] openrisc: always use unaligned-struct header
2021-05-07 22:07 ` [OpenRISC] " Arnd Bergmann
@ 2021-05-08 11:42 ` David Laight
-1 siblings, 0 replies; 50+ messages in thread
From: David Laight @ 2021-05-08 11:42 UTC (permalink / raw)
To: 'Arnd Bergmann', linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, Jonas Bonn,
Stefan Kristiansson, Stafford Horne, openrisc, linux-kernel
From: Arnd Bergmann
> Sent: 07 May 2021 23:08
...
> I don't know how the loads/store perform compared to the shift version
> on a particular microarchitecture, but my guess is that the shifts
> are better.
What does the nios use?
Shifts generate reasonable code for put_unaligned() but
they get horrid for get_unaligned().
On the nios writing the 4 bytes to memory and reading back
a 32bit value should generate shorter faster code.
You do need to generate 4 byte loads, 4 bytes stores, 32bit load.
(The load will cause a stall if the data is needed for one
of the next two instructions, and there is a (undocumented)
stall between a write and read to the same memory area.
The shift version requires 3 shifts and 3 ors - but I think
gcc makes a bigger pig's breakfast of it.)
OTOH I'm not sure anyone in their right mind would run Linux on nios.
It is a soft cpu for the altera (now intel) fpgas.
We use them with 4k code and sub 64k data for real time processing.
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
^ permalink raw reply [flat|nested] 50+ messages in thread
* [OpenRISC] [RFC 02/12] openrisc: always use unaligned-struct header
@ 2021-05-08 11:42 ` David Laight
0 siblings, 0 replies; 50+ messages in thread
From: David Laight @ 2021-05-08 11:42 UTC (permalink / raw)
To: openrisc
From: Arnd Bergmann
> Sent: 07 May 2021 23:08
...
> I don't know how the loads/store perform compared to the shift version
> on a particular microarchitecture, but my guess is that the shifts
> are better.
What does the nios use?
Shifts generate reasonable code for put_unaligned() but
they get horrid for get_unaligned().
On the nios writing the 4 bytes to memory and reading back
a 32bit value should generate shorter faster code.
You do need to generate 4 byte loads, 4 bytes stores, 32bit load.
(The load will cause a stall if the data is needed for one
of the next two instructions, and there is a (undocumented)
stall between a write and read to the same memory area.
The shift version requires 3 shifts and 3 ors - but I think
gcc makes a bigger pig's breakfast of it.)
OTOH I'm not sure anyone in their right mind would run Linux on nios.
It is a soft cpu for the altera (now intel) fpgas.
We use them with 4k code and sub 64k data for real time processing.
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
^ permalink raw reply [flat|nested] 50+ messages in thread
* [RFC 03/12] sh: remove unaligned access for sh4a
2021-05-07 22:07 ` Arnd Bergmann
` (4 preceding siblings ...)
(?)
@ 2021-05-07 22:07 ` Arnd Bergmann
2021-05-10 21:11 ` Rob Landley
-1 siblings, 1 reply; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, Yoshinori Sato,
Rich Felker, linux-sh, linux-kernel
From: Arnd Bergmann <arnd@arndb.de>
Unlike every other architecture, sh4a uses an inline asm implementation
for get_unaligned(). I have shown that this produces better object
code than the asm-generic version. However, there are very few users of
arch/sh/ overall, and most of those seem to use sh4 rather than sh4a CPU
cores, so it seems not worth keeping the complexity in the architecture
independent code.
Change over to the generic version to allow simplifying that in a
follow-up patch.
If there are sh4a users that want the best performance, it would probably
be best to add support for the movua instruction in gcc itself, as this
would not just help get_unaligned() callers but any code that accesses
a __packed variable in user space or kernel.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/sh/include/asm/unaligned-sh4a.h | 199 ---------------------------
arch/sh/include/asm/unaligned.h | 13 --
2 files changed, 212 deletions(-)
delete mode 100644 arch/sh/include/asm/unaligned-sh4a.h
delete mode 100644 arch/sh/include/asm/unaligned.h
diff --git a/arch/sh/include/asm/unaligned-sh4a.h b/arch/sh/include/asm/unaligned-sh4a.h
deleted file mode 100644
index d311f00ed530..000000000000
--- a/arch/sh/include/asm/unaligned-sh4a.h
+++ /dev/null
@@ -1,199 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __ASM_SH_UNALIGNED_SH4A_H
-#define __ASM_SH_UNALIGNED_SH4A_H
-
-/*
- * SH-4A has support for unaligned 32-bit loads, and 32-bit loads only.
- * Support for 64-bit accesses are done through shifting and masking
- * relative to the endianness. Unaligned stores are not supported by the
- * instruction encoding, so these continue to use the packed
- * struct.
- *
- * The same note as with the movli.l/movco.l pair applies here, as long
- * as the load is guaranteed to be inlined, nothing else will hook in to
- * r0 and we get the return value for free.
- *
- * NOTE: Due to the fact we require r0 encoding, care should be taken to
- * avoid mixing these heavily with other r0 consumers, such as the atomic
- * ops. Failure to adhere to this can result in the compiler running out
- * of spill registers and blowing up when building at low optimization
- * levels. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34777.
- */
-#include <linux/unaligned/packed_struct.h>
-#include <linux/types.h>
-#include <asm/byteorder.h>
-
-static inline u16 sh4a_get_unaligned_cpu16(const u8 *p)
-{
-#ifdef __LITTLE_ENDIAN
- return p[0] | p[1] << 8;
-#else
- return p[0] << 8 | p[1];
-#endif
-}
-
-static __always_inline u32 sh4a_get_unaligned_cpu32(const u8 *p)
-{
- unsigned long unaligned;
-
- __asm__ __volatile__ (
- "movua.l @%1, %0\n\t"
- : "=z" (unaligned)
- : "r" (p)
- );
-
- return unaligned;
-}
-
-/*
- * Even though movua.l supports auto-increment on the read side, it can
- * only store to r0 due to instruction encoding constraints, so just let
- * the compiler sort it out on its own.
- */
-static inline u64 sh4a_get_unaligned_cpu64(const u8 *p)
-{
-#ifdef __LITTLE_ENDIAN
- return (u64)sh4a_get_unaligned_cpu32(p + 4) << 32 |
- sh4a_get_unaligned_cpu32(p);
-#else
- return (u64)sh4a_get_unaligned_cpu32(p) << 32 |
- sh4a_get_unaligned_cpu32(p + 4);
-#endif
-}
-
-static inline u16 get_unaligned_le16(const void *p)
-{
- return le16_to_cpu(sh4a_get_unaligned_cpu16(p));
-}
-
-static inline u32 get_unaligned_le32(const void *p)
-{
- return le32_to_cpu(sh4a_get_unaligned_cpu32(p));
-}
-
-static inline u64 get_unaligned_le64(const void *p)
-{
- return le64_to_cpu(sh4a_get_unaligned_cpu64(p));
-}
-
-static inline u16 get_unaligned_be16(const void *p)
-{
- return be16_to_cpu(sh4a_get_unaligned_cpu16(p));
-}
-
-static inline u32 get_unaligned_be32(const void *p)
-{
- return be32_to_cpu(sh4a_get_unaligned_cpu32(p));
-}
-
-static inline u64 get_unaligned_be64(const void *p)
-{
- return be64_to_cpu(sh4a_get_unaligned_cpu64(p));
-}
-
-static inline void nonnative_put_le16(u16 val, u8 *p)
-{
- *p++ = val;
- *p++ = val >> 8;
-}
-
-static inline void nonnative_put_le32(u32 val, u8 *p)
-{
- nonnative_put_le16(val, p);
- nonnative_put_le16(val >> 16, p + 2);
-}
-
-static inline void nonnative_put_le64(u64 val, u8 *p)
-{
- nonnative_put_le32(val, p);
- nonnative_put_le32(val >> 32, p + 4);
-}
-
-static inline void nonnative_put_be16(u16 val, u8 *p)
-{
- *p++ = val >> 8;
- *p++ = val;
-}
-
-static inline void nonnative_put_be32(u32 val, u8 *p)
-{
- nonnative_put_be16(val >> 16, p);
- nonnative_put_be16(val, p + 2);
-}
-
-static inline void nonnative_put_be64(u64 val, u8 *p)
-{
- nonnative_put_be32(val >> 32, p);
- nonnative_put_be32(val, p + 4);
-}
-
-static inline void put_unaligned_le16(u16 val, void *p)
-{
-#ifdef __LITTLE_ENDIAN
- __put_unaligned_cpu16(val, p);
-#else
- nonnative_put_le16(val, p);
-#endif
-}
-
-static inline void put_unaligned_le32(u32 val, void *p)
-{
-#ifdef __LITTLE_ENDIAN
- __put_unaligned_cpu32(val, p);
-#else
- nonnative_put_le32(val, p);
-#endif
-}
-
-static inline void put_unaligned_le64(u64 val, void *p)
-{
-#ifdef __LITTLE_ENDIAN
- __put_unaligned_cpu64(val, p);
-#else
- nonnative_put_le64(val, p);
-#endif
-}
-
-static inline void put_unaligned_be16(u16 val, void *p)
-{
-#ifdef __BIG_ENDIAN
- __put_unaligned_cpu16(val, p);
-#else
- nonnative_put_be16(val, p);
-#endif
-}
-
-static inline void put_unaligned_be32(u32 val, void *p)
-{
-#ifdef __BIG_ENDIAN
- __put_unaligned_cpu32(val, p);
-#else
- nonnative_put_be32(val, p);
-#endif
-}
-
-static inline void put_unaligned_be64(u64 val, void *p)
-{
-#ifdef __BIG_ENDIAN
- __put_unaligned_cpu64(val, p);
-#else
- nonnative_put_be64(val, p);
-#endif
-}
-
-/*
- * While it's a bit non-obvious, even though the generic le/be wrappers
- * use the __get/put_xxx prefixing, they actually wrap in to the
- * non-prefixed get/put_xxx variants as provided above.
- */
-#include <linux/unaligned/generic.h>
-
-#ifdef __LITTLE_ENDIAN
-# define get_unaligned __get_unaligned_le
-# define put_unaligned __put_unaligned_le
-#else
-# define get_unaligned __get_unaligned_be
-# define put_unaligned __put_unaligned_be
-#endif
-
-#endif /* __ASM_SH_UNALIGNED_SH4A_H */
diff --git a/arch/sh/include/asm/unaligned.h b/arch/sh/include/asm/unaligned.h
deleted file mode 100644
index 0c92e2c73af4..000000000000
--- a/arch/sh/include/asm/unaligned.h
+++ /dev/null
@@ -1,13 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_SH_UNALIGNED_H
-#define _ASM_SH_UNALIGNED_H
-
-#ifdef CONFIG_CPU_SH4A
-/* SH-4A can handle unaligned loads in a relatively neutered fashion. */
-#include <asm/unaligned-sh4a.h>
-#else
-/* Otherwise, SH can't handle unaligned accesses. */
-#include <asm-generic/unaligned.h>
-#endif
-
-#endif /* _ASM_SH_UNALIGNED_H */
--
2.29.2
^ permalink raw reply related [flat|nested] 50+ messages in thread* Re: [RFC 03/12] sh: remove unaligned access for sh4a
2021-05-07 22:07 ` [RFC 03/12] sh: remove unaligned access for sh4a Arnd Bergmann
@ 2021-05-10 21:11 ` Rob Landley
0 siblings, 0 replies; 50+ messages in thread
From: Rob Landley @ 2021-05-10 21:11 UTC (permalink / raw)
To: Arnd Bergmann, linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, Yoshinori Sato,
Rich Felker, linux-sh, linux-kernel
On 5/7/21 5:07 PM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> Unlike every other architecture, sh4a uses an inline asm implementation
> for get_unaligned(). I have shown that this produces better object
> code than the asm-generic version. However, there are very few users of
> arch/sh/ overall, and most of those seem to use sh4 rather than sh4a CPU
Hitachi's sh4, sh3, and sh2 are all out of patent, and have been cloned as open
hardware. (Modulo the sh4 clone uses a different mmu design, but lots of
regression testing gets done against qemu-system-sh4 and sh4 hardware using the
original mmu.) Plus superh was the bestselling CPU architecture in the world for
3 years back in the 1990s, and there's a remaining userbase from that.
sh5 and the "a" designs like sh4a were created by renesas after hitachi spun off
the IP to them, and are not out of patent. I do not have access to an sh4a test
system.
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> arch/sh/include/asm/unaligned-sh4a.h | 199 ---------------------------
> arch/sh/include/asm/unaligned.h | 13 --
All I can test is that it didn't cause regressions on my sh4 and j-core systems,
which it (unsurprisingly) did not.
Acked-by: Rob Landley <rob@landley.net>
Rob
^ permalink raw reply [flat|nested] 50+ messages in thread
* [RFC 04/12] m68k: select CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2021-05-07 22:07 ` Arnd Bergmann
` (5 preceding siblings ...)
(?)
@ 2021-05-07 22:07 ` Arnd Bergmann
2021-05-10 10:18 ` Geert Uytterhoeven
-1 siblings, 1 reply; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, Geert Uytterhoeven,
linux-m68k, linux-kernel
From: Arnd Bergmann <arnd@arndb.de>
All supported CPUs other than the old dragonball use the
include/linux/unaligned/access_ok.h implementation for accessing unaligned
variables, so presumably this works everywhere.
However, m68k never selects CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS,
so none of the other conditionals in the kernel get the optimized
implementation.
Select this based on CPU_HAS_NO_UNALIGNED to make the two settings
always match, and then use the generic version of the header.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/m68k/Kconfig | 1 +
arch/m68k/include/asm/unaligned.h | 19 -------------------
2 files changed, 1 insertion(+), 19 deletions(-)
delete mode 100644 arch/m68k/include/asm/unaligned.h
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 5f1aafa7b2e2..9b586752807e 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -22,6 +22,7 @@ config M68K
select HAVE_AOUT if MMU
select HAVE_ASM_MODVERSIONS
select HAVE_DEBUG_BUGVERBOSE
+ select HAVE_EFFICIENT_UNALIGNED_ACCESS if !CPU_HAS_NO_UNALIGNED
select HAVE_FUTEX_CMPXCHG if MMU && FUTEX
select HAVE_IDE
select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
diff --git a/arch/m68k/include/asm/unaligned.h b/arch/m68k/include/asm/unaligned.h
deleted file mode 100644
index 84e437337344..000000000000
--- a/arch/m68k/include/asm/unaligned.h
+++ /dev/null
@@ -1,19 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_M68K_UNALIGNED_H
-#define _ASM_M68K_UNALIGNED_H
-
-#ifdef CONFIG_CPU_HAS_NO_UNALIGNED
-#include <asm-generic/unaligned.h>
-#else
-/*
- * The m68k can do unaligned accesses itself.
- */
-#include <linux/unaligned/access_ok.h>
-#include <linux/unaligned/generic.h>
-
-#define get_unaligned __get_unaligned_be
-#define put_unaligned __put_unaligned_be
-
-#endif
-
-#endif /* _ASM_M68K_UNALIGNED_H */
--
2.29.2
^ permalink raw reply related [flat|nested] 50+ messages in thread* Re: [RFC 04/12] m68k: select CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2021-05-07 22:07 ` [RFC 04/12] m68k: select CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS Arnd Bergmann
@ 2021-05-10 10:18 ` Geert Uytterhoeven
0 siblings, 0 replies; 50+ messages in thread
From: Geert Uytterhoeven @ 2021-05-10 10:18 UTC (permalink / raw)
To: Arnd Bergmann
Cc: Linux-Arch, Linus Torvalds, Vineet Gupta, Arnd Bergmann,
linux-m68k, Linux Kernel Mailing List
Hi Arnd,
On Sat, May 8, 2021 at 12:10 AM Arnd Bergmann <arnd@kernel.org> wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> All supported CPUs other than the old dragonball use the
Same comment about dragonball as for patch 01/12.
> include/linux/unaligned/access_ok.h implementation for accessing unaligned
> variables, so presumably this works everywhere.
>
> However, m68k never selects CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS,
> so none of the other conditionals in the kernel get the optimized
> implementation.
>
> Select this based on CPU_HAS_NO_UNALIGNED to make the two settings
> always match, and then use the generic version of the header.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> --- a/arch/m68k/Kconfig
> +++ b/arch/m68k/Kconfig
> @@ -22,6 +22,7 @@ config M68K
> select HAVE_AOUT if MMU
> select HAVE_ASM_MODVERSIONS
> select HAVE_DEBUG_BUGVERBOSE
> + select HAVE_EFFICIENT_UNALIGNED_ACCESS if !CPU_HAS_NO_UNALIGNED
This was clearly forgotten in commit 58340a07c194e0ae ("introduce
HAVE_EFFICIENT_UNALIGNED_ACCESS Kconfig symbol"), which predates the
existence of CPU_HAS_NO_UNALIGNED.
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply [flat|nested] 50+ messages in thread
* [RFC 05/12] powerpc: use linux/unaligned/le_struct.h on LE power7
2021-05-07 22:07 ` Arnd Bergmann
@ 2021-05-07 22:07 ` Arnd Bergmann
-1 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, Michael Ellerman,
Benjamin Herrenschmidt, Paul Mackerras, linuxppc-dev,
linux-kernel
From: Arnd Bergmann <arnd@arndb.de>
Little-endian POWER7 kernels disable
CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS because that is not supported on
the hardware, but the kernel still uses direct load/store for explicti
get_unaligned()/put_unaligned().
I assume this is a mistake that leads to power7 having to trap and fix
up all these unaligned accesses at a noticeable performance cost.
The fix is completely trivial, just remove the file and use the
generic version that gets it right.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/powerpc/include/asm/unaligned.h | 22 ----------------------
1 file changed, 22 deletions(-)
delete mode 100644 arch/powerpc/include/asm/unaligned.h
diff --git a/arch/powerpc/include/asm/unaligned.h b/arch/powerpc/include/asm/unaligned.h
deleted file mode 100644
index ce69c5eff95e..000000000000
--- a/arch/powerpc/include/asm/unaligned.h
+++ /dev/null
@@ -1,22 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_POWERPC_UNALIGNED_H
-#define _ASM_POWERPC_UNALIGNED_H
-
-#ifdef __KERNEL__
-
-/*
- * The PowerPC can do unaligned accesses itself based on its endian mode.
- */
-#include <linux/unaligned/access_ok.h>
-#include <linux/unaligned/generic.h>
-
-#ifdef __LITTLE_ENDIAN__
-#define get_unaligned __get_unaligned_le
-#define put_unaligned __put_unaligned_le
-#else
-#define get_unaligned __get_unaligned_be
-#define put_unaligned __put_unaligned_be
-#endif
-
-#endif /* __KERNEL__ */
-#endif /* _ASM_POWERPC_UNALIGNED_H */
--
2.29.2
^ permalink raw reply related [flat|nested] 50+ messages in thread
* [RFC 05/12] powerpc: use linux/unaligned/le_struct.h on LE power7
@ 2021-05-07 22:07 ` Arnd Bergmann
0 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch
Cc: Arnd Bergmann, Vineet Gupta, linuxppc-dev, linux-kernel,
Paul Mackerras, Linus Torvalds
From: Arnd Bergmann <arnd@arndb.de>
Little-endian POWER7 kernels disable
CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS because that is not supported on
the hardware, but the kernel still uses direct load/store for explicti
get_unaligned()/put_unaligned().
I assume this is a mistake that leads to power7 having to trap and fix
up all these unaligned accesses at a noticeable performance cost.
The fix is completely trivial, just remove the file and use the
generic version that gets it right.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/powerpc/include/asm/unaligned.h | 22 ----------------------
1 file changed, 22 deletions(-)
delete mode 100644 arch/powerpc/include/asm/unaligned.h
diff --git a/arch/powerpc/include/asm/unaligned.h b/arch/powerpc/include/asm/unaligned.h
deleted file mode 100644
index ce69c5eff95e..000000000000
--- a/arch/powerpc/include/asm/unaligned.h
+++ /dev/null
@@ -1,22 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_POWERPC_UNALIGNED_H
-#define _ASM_POWERPC_UNALIGNED_H
-
-#ifdef __KERNEL__
-
-/*
- * The PowerPC can do unaligned accesses itself based on its endian mode.
- */
-#include <linux/unaligned/access_ok.h>
-#include <linux/unaligned/generic.h>
-
-#ifdef __LITTLE_ENDIAN__
-#define get_unaligned __get_unaligned_le
-#define put_unaligned __put_unaligned_le
-#else
-#define get_unaligned __get_unaligned_be
-#define put_unaligned __put_unaligned_be
-#endif
-
-#endif /* __KERNEL__ */
-#endif /* _ASM_POWERPC_UNALIGNED_H */
--
2.29.2
^ permalink raw reply related [flat|nested] 50+ messages in thread
* [RFC 06/12] asm-generic: unaligned: remove byteshift helpers
2021-05-07 22:07 ` Arnd Bergmann
@ 2021-05-07 22:07 ` Arnd Bergmann
-1 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, Russell King,
Nathan Chancellor, Nick Desaulniers, linux-arm-kernel,
linux-kernel, clang-built-linux
From: Arnd Bergmann <arnd@arndb.de>
In theory, compilers should be able to work this out themselves so we
can use a simpler version based on the swab() helpers.
I have verified that this works on all supported compiler versions
(gcc-4.9 and up, clang-10 and up). Looking at the object code produced by
gcc-11, I found that the impact is mostly a change in inlining decisions
that lead to slightly larger code.
In other cases, this version produces explicit byte swaps in place of
separate byte access, or comparing against pre-swapped constants.
While the source code is clearly simpler, I have not seen an indication
of the new version actually producing better code on Arm, so maybe
we want to skip this after all. From what I can tell, gcc recognizes
the byteswap pattern in the byteshift.h header and can turn it into
explicit instructions, but it does not turn a __builtin_bswap32() back
into individual bytes when that would result in better output, e.g.
when storing a byte-reversed constant.
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
I've included this patch in the series because Linus asked about
removing the byteshift version, but after trying it out, I'd
prefer to drop this and use the byteshift version for the
generic code as well.
---
arch/arm/include/asm/unaligned.h | 2 -
include/asm-generic/unaligned.h | 2 -
include/linux/unaligned/be_byteshift.h | 71 --------------------------
include/linux/unaligned/be_struct.h | 30 +++++++++++
include/linux/unaligned/le_byteshift.h | 71 --------------------------
include/linux/unaligned/le_struct.h | 30 +++++++++++
6 files changed, 60 insertions(+), 146 deletions(-)
delete mode 100644 include/linux/unaligned/be_byteshift.h
delete mode 100644 include/linux/unaligned/le_byteshift.h
diff --git a/arch/arm/include/asm/unaligned.h b/arch/arm/include/asm/unaligned.h
index ab905ffcf193..3c5248fb4cdc 100644
--- a/arch/arm/include/asm/unaligned.h
+++ b/arch/arm/include/asm/unaligned.h
@@ -10,13 +10,11 @@
#if defined(__LITTLE_ENDIAN)
# include <linux/unaligned/le_struct.h>
-# include <linux/unaligned/be_byteshift.h>
# include <linux/unaligned/generic.h>
# define get_unaligned __get_unaligned_le
# define put_unaligned __put_unaligned_le
#elif defined(__BIG_ENDIAN)
# include <linux/unaligned/be_struct.h>
-# include <linux/unaligned/le_byteshift.h>
# include <linux/unaligned/generic.h>
# define get_unaligned __get_unaligned_be
# define put_unaligned __put_unaligned_be
diff --git a/include/asm-generic/unaligned.h b/include/asm-generic/unaligned.h
index 374c940e9be1..d79df721ae60 100644
--- a/include/asm-generic/unaligned.h
+++ b/include/asm-generic/unaligned.h
@@ -16,7 +16,6 @@
#if defined(__LITTLE_ENDIAN)
# ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
# include <linux/unaligned/le_struct.h>
-# include <linux/unaligned/be_byteshift.h>
# endif
# include <linux/unaligned/generic.h>
# define get_unaligned __get_unaligned_le
@@ -24,7 +23,6 @@
#elif defined(__BIG_ENDIAN)
# ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
# include <linux/unaligned/be_struct.h>
-# include <linux/unaligned/le_byteshift.h>
# endif
# include <linux/unaligned/generic.h>
# define get_unaligned __get_unaligned_be
diff --git a/include/linux/unaligned/be_byteshift.h b/include/linux/unaligned/be_byteshift.h
deleted file mode 100644
index c43ff5918c8a..000000000000
--- a/include/linux/unaligned/be_byteshift.h
+++ /dev/null
@@ -1,71 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_UNALIGNED_BE_BYTESHIFT_H
-#define _LINUX_UNALIGNED_BE_BYTESHIFT_H
-
-#include <linux/types.h>
-
-static inline u16 __get_unaligned_be16(const u8 *p)
-{
- return p[0] << 8 | p[1];
-}
-
-static inline u32 __get_unaligned_be32(const u8 *p)
-{
- return p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3];
-}
-
-static inline u64 __get_unaligned_be64(const u8 *p)
-{
- return (u64)__get_unaligned_be32(p) << 32 |
- __get_unaligned_be32(p + 4);
-}
-
-static inline void __put_unaligned_be16(u16 val, u8 *p)
-{
- *p++ = val >> 8;
- *p++ = val;
-}
-
-static inline void __put_unaligned_be32(u32 val, u8 *p)
-{
- __put_unaligned_be16(val >> 16, p);
- __put_unaligned_be16(val, p + 2);
-}
-
-static inline void __put_unaligned_be64(u64 val, u8 *p)
-{
- __put_unaligned_be32(val >> 32, p);
- __put_unaligned_be32(val, p + 4);
-}
-
-static inline u16 get_unaligned_be16(const void *p)
-{
- return __get_unaligned_be16(p);
-}
-
-static inline u32 get_unaligned_be32(const void *p)
-{
- return __get_unaligned_be32(p);
-}
-
-static inline u64 get_unaligned_be64(const void *p)
-{
- return __get_unaligned_be64(p);
-}
-
-static inline void put_unaligned_be16(u16 val, void *p)
-{
- __put_unaligned_be16(val, p);
-}
-
-static inline void put_unaligned_be32(u32 val, void *p)
-{
- __put_unaligned_be32(val, p);
-}
-
-static inline void put_unaligned_be64(u64 val, void *p)
-{
- __put_unaligned_be64(val, p);
-}
-
-#endif /* _LINUX_UNALIGNED_BE_BYTESHIFT_H */
diff --git a/include/linux/unaligned/be_struct.h b/include/linux/unaligned/be_struct.h
index 15ea503a13fc..76d9fe297c33 100644
--- a/include/linux/unaligned/be_struct.h
+++ b/include/linux/unaligned/be_struct.h
@@ -34,4 +34,34 @@ static inline void put_unaligned_be64(u64 val, void *p)
__put_unaligned_cpu64(val, p);
}
+static inline u16 get_unaligned_le16(const void *p)
+{
+ return swab16(__get_unaligned_cpu16((const u8 *)p));
+}
+
+static inline u32 get_unaligned_le32(const void *p)
+{
+ return swab32(__get_unaligned_cpu32((const u8 *)p));
+}
+
+static inline u64 get_unaligned_le64(const void *p)
+{
+ return swab64(__get_unaligned_cpu64((const u8 *)p));
+}
+
+static inline void put_unaligned_le16(u16 val, void *p)
+{
+ __put_unaligned_cpu16(swab16(val), p);
+}
+
+static inline void put_unaligned_le32(u32 val, void *p)
+{
+ __put_unaligned_cpu32(swab32(val), p);
+}
+
+static inline void put_unaligned_le64(u64 val, void *p)
+{
+ __put_unaligned_cpu64(swab64(val), p);
+}
+
#endif /* _LINUX_UNALIGNED_BE_STRUCT_H */
diff --git a/include/linux/unaligned/le_byteshift.h b/include/linux/unaligned/le_byteshift.h
deleted file mode 100644
index 2248dcb0df76..000000000000
--- a/include/linux/unaligned/le_byteshift.h
+++ /dev/null
@@ -1,71 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_UNALIGNED_LE_BYTESHIFT_H
-#define _LINUX_UNALIGNED_LE_BYTESHIFT_H
-
-#include <linux/types.h>
-
-static inline u16 __get_unaligned_le16(const u8 *p)
-{
- return p[0] | p[1] << 8;
-}
-
-static inline u32 __get_unaligned_le32(const u8 *p)
-{
- return p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24;
-}
-
-static inline u64 __get_unaligned_le64(const u8 *p)
-{
- return (u64)__get_unaligned_le32(p + 4) << 32 |
- __get_unaligned_le32(p);
-}
-
-static inline void __put_unaligned_le16(u16 val, u8 *p)
-{
- *p++ = val;
- *p++ = val >> 8;
-}
-
-static inline void __put_unaligned_le32(u32 val, u8 *p)
-{
- __put_unaligned_le16(val >> 16, p + 2);
- __put_unaligned_le16(val, p);
-}
-
-static inline void __put_unaligned_le64(u64 val, u8 *p)
-{
- __put_unaligned_le32(val >> 32, p + 4);
- __put_unaligned_le32(val, p);
-}
-
-static inline u16 get_unaligned_le16(const void *p)
-{
- return __get_unaligned_le16(p);
-}
-
-static inline u32 get_unaligned_le32(const void *p)
-{
- return __get_unaligned_le32(p);
-}
-
-static inline u64 get_unaligned_le64(const void *p)
-{
- return __get_unaligned_le64(p);
-}
-
-static inline void put_unaligned_le16(u16 val, void *p)
-{
- __put_unaligned_le16(val, p);
-}
-
-static inline void put_unaligned_le32(u32 val, void *p)
-{
- __put_unaligned_le32(val, p);
-}
-
-static inline void put_unaligned_le64(u64 val, void *p)
-{
- __put_unaligned_le64(val, p);
-}
-
-#endif /* _LINUX_UNALIGNED_LE_BYTESHIFT_H */
diff --git a/include/linux/unaligned/le_struct.h b/include/linux/unaligned/le_struct.h
index 9977987883a6..22f90a4afaa5 100644
--- a/include/linux/unaligned/le_struct.h
+++ b/include/linux/unaligned/le_struct.h
@@ -34,4 +34,34 @@ static inline void put_unaligned_le64(u64 val, void *p)
__put_unaligned_cpu64(val, p);
}
+static inline u16 get_unaligned_be16(const void *p)
+{
+ return swab16(__get_unaligned_cpu16((const u8 *)p));
+}
+
+static inline u32 get_unaligned_be32(const void *p)
+{
+ return swab32(__get_unaligned_cpu32((const u8 *)p));
+}
+
+static inline u64 get_unaligned_be64(const void *p)
+{
+ return swab64(__get_unaligned_cpu64((const u8 *)p));
+}
+
+static inline void put_unaligned_be16(u16 val, void *p)
+{
+ __put_unaligned_cpu16(swab16(val), p);
+}
+
+static inline void put_unaligned_be32(u32 val, void *p)
+{
+ __put_unaligned_cpu32(swab32(val), p);
+}
+
+static inline void put_unaligned_be64(u64 val, void *p)
+{
+ __put_unaligned_cpu64(swab64(val), p);
+}
+
#endif /* _LINUX_UNALIGNED_LE_STRUCT_H */
--
2.29.2
^ permalink raw reply related [flat|nested] 50+ messages in thread* [RFC 06/12] asm-generic: unaligned: remove byteshift helpers
@ 2021-05-07 22:07 ` Arnd Bergmann
0 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, Russell King,
Nathan Chancellor, Nick Desaulniers, linux-arm-kernel,
linux-kernel, clang-built-linux
From: Arnd Bergmann <arnd@arndb.de>
In theory, compilers should be able to work this out themselves so we
can use a simpler version based on the swab() helpers.
I have verified that this works on all supported compiler versions
(gcc-4.9 and up, clang-10 and up). Looking at the object code produced by
gcc-11, I found that the impact is mostly a change in inlining decisions
that lead to slightly larger code.
In other cases, this version produces explicit byte swaps in place of
separate byte access, or comparing against pre-swapped constants.
While the source code is clearly simpler, I have not seen an indication
of the new version actually producing better code on Arm, so maybe
we want to skip this after all. From what I can tell, gcc recognizes
the byteswap pattern in the byteshift.h header and can turn it into
explicit instructions, but it does not turn a __builtin_bswap32() back
into individual bytes when that would result in better output, e.g.
when storing a byte-reversed constant.
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
I've included this patch in the series because Linus asked about
removing the byteshift version, but after trying it out, I'd
prefer to drop this and use the byteshift version for the
generic code as well.
---
arch/arm/include/asm/unaligned.h | 2 -
include/asm-generic/unaligned.h | 2 -
include/linux/unaligned/be_byteshift.h | 71 --------------------------
include/linux/unaligned/be_struct.h | 30 +++++++++++
include/linux/unaligned/le_byteshift.h | 71 --------------------------
include/linux/unaligned/le_struct.h | 30 +++++++++++
6 files changed, 60 insertions(+), 146 deletions(-)
delete mode 100644 include/linux/unaligned/be_byteshift.h
delete mode 100644 include/linux/unaligned/le_byteshift.h
diff --git a/arch/arm/include/asm/unaligned.h b/arch/arm/include/asm/unaligned.h
index ab905ffcf193..3c5248fb4cdc 100644
--- a/arch/arm/include/asm/unaligned.h
+++ b/arch/arm/include/asm/unaligned.h
@@ -10,13 +10,11 @@
#if defined(__LITTLE_ENDIAN)
# include <linux/unaligned/le_struct.h>
-# include <linux/unaligned/be_byteshift.h>
# include <linux/unaligned/generic.h>
# define get_unaligned __get_unaligned_le
# define put_unaligned __put_unaligned_le
#elif defined(__BIG_ENDIAN)
# include <linux/unaligned/be_struct.h>
-# include <linux/unaligned/le_byteshift.h>
# include <linux/unaligned/generic.h>
# define get_unaligned __get_unaligned_be
# define put_unaligned __put_unaligned_be
diff --git a/include/asm-generic/unaligned.h b/include/asm-generic/unaligned.h
index 374c940e9be1..d79df721ae60 100644
--- a/include/asm-generic/unaligned.h
+++ b/include/asm-generic/unaligned.h
@@ -16,7 +16,6 @@
#if defined(__LITTLE_ENDIAN)
# ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
# include <linux/unaligned/le_struct.h>
-# include <linux/unaligned/be_byteshift.h>
# endif
# include <linux/unaligned/generic.h>
# define get_unaligned __get_unaligned_le
@@ -24,7 +23,6 @@
#elif defined(__BIG_ENDIAN)
# ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
# include <linux/unaligned/be_struct.h>
-# include <linux/unaligned/le_byteshift.h>
# endif
# include <linux/unaligned/generic.h>
# define get_unaligned __get_unaligned_be
diff --git a/include/linux/unaligned/be_byteshift.h b/include/linux/unaligned/be_byteshift.h
deleted file mode 100644
index c43ff5918c8a..000000000000
--- a/include/linux/unaligned/be_byteshift.h
+++ /dev/null
@@ -1,71 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_UNALIGNED_BE_BYTESHIFT_H
-#define _LINUX_UNALIGNED_BE_BYTESHIFT_H
-
-#include <linux/types.h>
-
-static inline u16 __get_unaligned_be16(const u8 *p)
-{
- return p[0] << 8 | p[1];
-}
-
-static inline u32 __get_unaligned_be32(const u8 *p)
-{
- return p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3];
-}
-
-static inline u64 __get_unaligned_be64(const u8 *p)
-{
- return (u64)__get_unaligned_be32(p) << 32 |
- __get_unaligned_be32(p + 4);
-}
-
-static inline void __put_unaligned_be16(u16 val, u8 *p)
-{
- *p++ = val >> 8;
- *p++ = val;
-}
-
-static inline void __put_unaligned_be32(u32 val, u8 *p)
-{
- __put_unaligned_be16(val >> 16, p);
- __put_unaligned_be16(val, p + 2);
-}
-
-static inline void __put_unaligned_be64(u64 val, u8 *p)
-{
- __put_unaligned_be32(val >> 32, p);
- __put_unaligned_be32(val, p + 4);
-}
-
-static inline u16 get_unaligned_be16(const void *p)
-{
- return __get_unaligned_be16(p);
-}
-
-static inline u32 get_unaligned_be32(const void *p)
-{
- return __get_unaligned_be32(p);
-}
-
-static inline u64 get_unaligned_be64(const void *p)
-{
- return __get_unaligned_be64(p);
-}
-
-static inline void put_unaligned_be16(u16 val, void *p)
-{
- __put_unaligned_be16(val, p);
-}
-
-static inline void put_unaligned_be32(u32 val, void *p)
-{
- __put_unaligned_be32(val, p);
-}
-
-static inline void put_unaligned_be64(u64 val, void *p)
-{
- __put_unaligned_be64(val, p);
-}
-
-#endif /* _LINUX_UNALIGNED_BE_BYTESHIFT_H */
diff --git a/include/linux/unaligned/be_struct.h b/include/linux/unaligned/be_struct.h
index 15ea503a13fc..76d9fe297c33 100644
--- a/include/linux/unaligned/be_struct.h
+++ b/include/linux/unaligned/be_struct.h
@@ -34,4 +34,34 @@ static inline void put_unaligned_be64(u64 val, void *p)
__put_unaligned_cpu64(val, p);
}
+static inline u16 get_unaligned_le16(const void *p)
+{
+ return swab16(__get_unaligned_cpu16((const u8 *)p));
+}
+
+static inline u32 get_unaligned_le32(const void *p)
+{
+ return swab32(__get_unaligned_cpu32((const u8 *)p));
+}
+
+static inline u64 get_unaligned_le64(const void *p)
+{
+ return swab64(__get_unaligned_cpu64((const u8 *)p));
+}
+
+static inline void put_unaligned_le16(u16 val, void *p)
+{
+ __put_unaligned_cpu16(swab16(val), p);
+}
+
+static inline void put_unaligned_le32(u32 val, void *p)
+{
+ __put_unaligned_cpu32(swab32(val), p);
+}
+
+static inline void put_unaligned_le64(u64 val, void *p)
+{
+ __put_unaligned_cpu64(swab64(val), p);
+}
+
#endif /* _LINUX_UNALIGNED_BE_STRUCT_H */
diff --git a/include/linux/unaligned/le_byteshift.h b/include/linux/unaligned/le_byteshift.h
deleted file mode 100644
index 2248dcb0df76..000000000000
--- a/include/linux/unaligned/le_byteshift.h
+++ /dev/null
@@ -1,71 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_UNALIGNED_LE_BYTESHIFT_H
-#define _LINUX_UNALIGNED_LE_BYTESHIFT_H
-
-#include <linux/types.h>
-
-static inline u16 __get_unaligned_le16(const u8 *p)
-{
- return p[0] | p[1] << 8;
-}
-
-static inline u32 __get_unaligned_le32(const u8 *p)
-{
- return p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24;
-}
-
-static inline u64 __get_unaligned_le64(const u8 *p)
-{
- return (u64)__get_unaligned_le32(p + 4) << 32 |
- __get_unaligned_le32(p);
-}
-
-static inline void __put_unaligned_le16(u16 val, u8 *p)
-{
- *p++ = val;
- *p++ = val >> 8;
-}
-
-static inline void __put_unaligned_le32(u32 val, u8 *p)
-{
- __put_unaligned_le16(val >> 16, p + 2);
- __put_unaligned_le16(val, p);
-}
-
-static inline void __put_unaligned_le64(u64 val, u8 *p)
-{
- __put_unaligned_le32(val >> 32, p + 4);
- __put_unaligned_le32(val, p);
-}
-
-static inline u16 get_unaligned_le16(const void *p)
-{
- return __get_unaligned_le16(p);
-}
-
-static inline u32 get_unaligned_le32(const void *p)
-{
- return __get_unaligned_le32(p);
-}
-
-static inline u64 get_unaligned_le64(const void *p)
-{
- return __get_unaligned_le64(p);
-}
-
-static inline void put_unaligned_le16(u16 val, void *p)
-{
- __put_unaligned_le16(val, p);
-}
-
-static inline void put_unaligned_le32(u32 val, void *p)
-{
- __put_unaligned_le32(val, p);
-}
-
-static inline void put_unaligned_le64(u64 val, void *p)
-{
- __put_unaligned_le64(val, p);
-}
-
-#endif /* _LINUX_UNALIGNED_LE_BYTESHIFT_H */
diff --git a/include/linux/unaligned/le_struct.h b/include/linux/unaligned/le_struct.h
index 9977987883a6..22f90a4afaa5 100644
--- a/include/linux/unaligned/le_struct.h
+++ b/include/linux/unaligned/le_struct.h
@@ -34,4 +34,34 @@ static inline void put_unaligned_le64(u64 val, void *p)
__put_unaligned_cpu64(val, p);
}
+static inline u16 get_unaligned_be16(const void *p)
+{
+ return swab16(__get_unaligned_cpu16((const u8 *)p));
+}
+
+static inline u32 get_unaligned_be32(const void *p)
+{
+ return swab32(__get_unaligned_cpu32((const u8 *)p));
+}
+
+static inline u64 get_unaligned_be64(const void *p)
+{
+ return swab64(__get_unaligned_cpu64((const u8 *)p));
+}
+
+static inline void put_unaligned_be16(u16 val, void *p)
+{
+ __put_unaligned_cpu16(swab16(val), p);
+}
+
+static inline void put_unaligned_be32(u32 val, void *p)
+{
+ __put_unaligned_cpu32(swab32(val), p);
+}
+
+static inline void put_unaligned_be64(u64 val, void *p)
+{
+ __put_unaligned_cpu64(swab64(val), p);
+}
+
#endif /* _LINUX_UNALIGNED_LE_STRUCT_H */
--
2.29.2
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 50+ messages in thread* Re: [RFC 06/12] asm-generic: unaligned: remove byteshift helpers
2021-05-07 22:07 ` Arnd Bergmann
@ 2021-05-08 11:38 ` Arnd Bergmann
-1 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-08 11:38 UTC (permalink / raw)
To: linux-arch
Cc: Linus Torvalds, Vineet Gupta, Russell King, Nathan Chancellor,
Nick Desaulniers, Linux ARM, Linux Kernel Mailing List,
clang-built-linux
On Sat, May 8, 2021 at 12:11 AM Arnd Bergmann <arnd@kernel.org> wrote:
>
> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> I've included this patch in the series because Linus asked about
> removing the byteshift version, but after trying it out, I'd
> prefer to drop this and use the byteshift version for the
> generic code as well.
Update: I've tried to create a small test case that illustrates the problem
with using the swab() based version, however all cases combinations
I tried showed either both producing identical output, or the shift
version being worse, see https://godbolt.org/z/bTdsjnjfT
I'll rewrite the patch description accordingly and leave this in place.
Arnd
^ permalink raw reply [flat|nested] 50+ messages in thread* Re: [RFC 06/12] asm-generic: unaligned: remove byteshift helpers
@ 2021-05-08 11:38 ` Arnd Bergmann
0 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-08 11:38 UTC (permalink / raw)
To: linux-arch
Cc: Linus Torvalds, Vineet Gupta, Russell King, Nathan Chancellor,
Nick Desaulniers, Linux ARM, Linux Kernel Mailing List,
clang-built-linux
On Sat, May 8, 2021 at 12:11 AM Arnd Bergmann <arnd@kernel.org> wrote:
>
> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> I've included this patch in the series because Linus asked about
> removing the byteshift version, but after trying it out, I'd
> prefer to drop this and use the byteshift version for the
> generic code as well.
Update: I've tried to create a small test case that illustrates the problem
with using the swab() based version, however all cases combinations
I tried showed either both producing identical output, or the shift
version being worse, see https://godbolt.org/z/bTdsjnjfT
I'll rewrite the patch description accordingly and leave this in place.
Arnd
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 50+ messages in thread
* [RFC 07/12] asm-generic: unaligned always use struct helpers
2021-05-07 22:07 ` Arnd Bergmann
@ 2021-05-07 22:07 ` Arnd Bergmann
-1 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, Russell King,
Herbert Xu, David S. Miller, Thomas Bogendoerfer,
linux-arm-kernel, linux-kernel, linux-crypto, linux-mips
From: Arnd Bergmann <arnd@arndb.de>
As found by Vineet Gupta and Linus Torvalds, gcc has somewhat unexpected
behavior when faced with overlapping unaligned pointers. The kernel's
unaligned/access-ok.h header technically invokes undefined behavior
that happens to usually work on the architectures using it, but if the
compiler optimizes code based on the assumption that undefined behavior
doesn't happen, it can create output that actually causes data corruption.
A related problem was previously found on 32-bit ARMv7, where most
instructions can be used on unaligned data, but 64-bit ldrd/strd causes
an exception. The workaround was to always use the unaligned/le_struct.h
helper instead of unaligned/access-ok.h, in commit 1cce91dfc8f7 ("ARM:
8715/1: add a private asm/unaligned.h").
The same solution should work on all other architectures as well, so
remove the access-ok.h variant and use the other one unconditionally on
all architectures, picking either the big-endian or little-endian version.
With this, the arm specific header can be removed as well, and the
only file including linux/unaligned/access_ok.h gets moved to including
the normal file.
Fortunately, this made almost no difference to the object code produced
by gcc-11. On x86, s390, powerpc, and arc, the resulting binary appears
to be identical to the previous version, while on arm64 and m68k there
are minimal differences that looks like an optimization pass went into
a different direction, usually using fewer stack spills on the new
version.
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100363
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/arm/include/asm/unaligned.h | 25 -----------
arch/mips/crypto/crc32-mips.c | 2 +-
include/asm-generic/unaligned.h | 13 +-----
include/linux/unaligned/access_ok.h | 68 -----------------------------
4 files changed, 3 insertions(+), 105 deletions(-)
delete mode 100644 arch/arm/include/asm/unaligned.h
delete mode 100644 include/linux/unaligned/access_ok.h
diff --git a/arch/arm/include/asm/unaligned.h b/arch/arm/include/asm/unaligned.h
deleted file mode 100644
index 3c5248fb4cdc..000000000000
--- a/arch/arm/include/asm/unaligned.h
+++ /dev/null
@@ -1,25 +0,0 @@
-#ifndef __ASM_ARM_UNALIGNED_H
-#define __ASM_ARM_UNALIGNED_H
-
-/*
- * We generally want to set CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS on ARMv6+,
- * but we don't want to use linux/unaligned/access_ok.h since that can lead
- * to traps on unaligned stm/ldm or strd/ldrd.
- */
-#include <asm/byteorder.h>
-
-#if defined(__LITTLE_ENDIAN)
-# include <linux/unaligned/le_struct.h>
-# include <linux/unaligned/generic.h>
-# define get_unaligned __get_unaligned_le
-# define put_unaligned __put_unaligned_le
-#elif defined(__BIG_ENDIAN)
-# include <linux/unaligned/be_struct.h>
-# include <linux/unaligned/generic.h>
-# define get_unaligned __get_unaligned_be
-# define put_unaligned __put_unaligned_be
-#else
-# error need to define endianess
-#endif
-
-#endif /* __ASM_ARM_UNALIGNED_H */
diff --git a/arch/mips/crypto/crc32-mips.c b/arch/mips/crypto/crc32-mips.c
index faa88a6a74c0..0a03529cf317 100644
--- a/arch/mips/crypto/crc32-mips.c
+++ b/arch/mips/crypto/crc32-mips.c
@@ -8,13 +8,13 @@
* Copyright (C) 2018 MIPS Tech, LLC
*/
-#include <linux/unaligned/access_ok.h>
#include <linux/cpufeature.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <asm/mipsregs.h>
+#include <asm/unaligned.h>
#include <crypto/internal/hash.h>
diff --git a/include/asm-generic/unaligned.h b/include/asm-generic/unaligned.h
index d79df721ae60..36bf03aaa674 100644
--- a/include/asm-generic/unaligned.h
+++ b/include/asm-generic/unaligned.h
@@ -8,22 +8,13 @@
*/
#include <asm/byteorder.h>
-/* Set by the arch if it can handle unaligned accesses in hardware. */
-#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
-# include <linux/unaligned/access_ok.h>
-#endif
-
#if defined(__LITTLE_ENDIAN)
-# ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
-# include <linux/unaligned/le_struct.h>
-# endif
+# include <linux/unaligned/le_struct.h>
# include <linux/unaligned/generic.h>
# define get_unaligned __get_unaligned_le
# define put_unaligned __put_unaligned_le
#elif defined(__BIG_ENDIAN)
-# ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
-# include <linux/unaligned/be_struct.h>
-# endif
+# include <linux/unaligned/be_struct.h>
# include <linux/unaligned/generic.h>
# define get_unaligned __get_unaligned_be
# define put_unaligned __put_unaligned_be
diff --git a/include/linux/unaligned/access_ok.h b/include/linux/unaligned/access_ok.h
deleted file mode 100644
index 167aa849c0ce..000000000000
--- a/include/linux/unaligned/access_ok.h
+++ /dev/null
@@ -1,68 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_UNALIGNED_ACCESS_OK_H
-#define _LINUX_UNALIGNED_ACCESS_OK_H
-
-#include <linux/kernel.h>
-#include <asm/byteorder.h>
-
-static __always_inline u16 get_unaligned_le16(const void *p)
-{
- return le16_to_cpup((__le16 *)p);
-}
-
-static __always_inline u32 get_unaligned_le32(const void *p)
-{
- return le32_to_cpup((__le32 *)p);
-}
-
-static __always_inline u64 get_unaligned_le64(const void *p)
-{
- return le64_to_cpup((__le64 *)p);
-}
-
-static __always_inline u16 get_unaligned_be16(const void *p)
-{
- return be16_to_cpup((__be16 *)p);
-}
-
-static __always_inline u32 get_unaligned_be32(const void *p)
-{
- return be32_to_cpup((__be32 *)p);
-}
-
-static __always_inline u64 get_unaligned_be64(const void *p)
-{
- return be64_to_cpup((__be64 *)p);
-}
-
-static __always_inline void put_unaligned_le16(u16 val, void *p)
-{
- *((__le16 *)p) = cpu_to_le16(val);
-}
-
-static __always_inline void put_unaligned_le32(u32 val, void *p)
-{
- *((__le32 *)p) = cpu_to_le32(val);
-}
-
-static __always_inline void put_unaligned_le64(u64 val, void *p)
-{
- *((__le64 *)p) = cpu_to_le64(val);
-}
-
-static __always_inline void put_unaligned_be16(u16 val, void *p)
-{
- *((__be16 *)p) = cpu_to_be16(val);
-}
-
-static __always_inline void put_unaligned_be32(u32 val, void *p)
-{
- *((__be32 *)p) = cpu_to_be32(val);
-}
-
-static __always_inline void put_unaligned_be64(u64 val, void *p)
-{
- *((__be64 *)p) = cpu_to_be64(val);
-}
-
-#endif /* _LINUX_UNALIGNED_ACCESS_OK_H */
--
2.29.2
^ permalink raw reply related [flat|nested] 50+ messages in thread* [RFC 07/12] asm-generic: unaligned always use struct helpers
@ 2021-05-07 22:07 ` Arnd Bergmann
0 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, Russell King,
Herbert Xu, David S. Miller, Thomas Bogendoerfer,
linux-arm-kernel, linux-kernel, linux-crypto, linux-mips
From: Arnd Bergmann <arnd@arndb.de>
As found by Vineet Gupta and Linus Torvalds, gcc has somewhat unexpected
behavior when faced with overlapping unaligned pointers. The kernel's
unaligned/access-ok.h header technically invokes undefined behavior
that happens to usually work on the architectures using it, but if the
compiler optimizes code based on the assumption that undefined behavior
doesn't happen, it can create output that actually causes data corruption.
A related problem was previously found on 32-bit ARMv7, where most
instructions can be used on unaligned data, but 64-bit ldrd/strd causes
an exception. The workaround was to always use the unaligned/le_struct.h
helper instead of unaligned/access-ok.h, in commit 1cce91dfc8f7 ("ARM:
8715/1: add a private asm/unaligned.h").
The same solution should work on all other architectures as well, so
remove the access-ok.h variant and use the other one unconditionally on
all architectures, picking either the big-endian or little-endian version.
With this, the arm specific header can be removed as well, and the
only file including linux/unaligned/access_ok.h gets moved to including
the normal file.
Fortunately, this made almost no difference to the object code produced
by gcc-11. On x86, s390, powerpc, and arc, the resulting binary appears
to be identical to the previous version, while on arm64 and m68k there
are minimal differences that looks like an optimization pass went into
a different direction, usually using fewer stack spills on the new
version.
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100363
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/arm/include/asm/unaligned.h | 25 -----------
arch/mips/crypto/crc32-mips.c | 2 +-
include/asm-generic/unaligned.h | 13 +-----
include/linux/unaligned/access_ok.h | 68 -----------------------------
4 files changed, 3 insertions(+), 105 deletions(-)
delete mode 100644 arch/arm/include/asm/unaligned.h
delete mode 100644 include/linux/unaligned/access_ok.h
diff --git a/arch/arm/include/asm/unaligned.h b/arch/arm/include/asm/unaligned.h
deleted file mode 100644
index 3c5248fb4cdc..000000000000
--- a/arch/arm/include/asm/unaligned.h
+++ /dev/null
@@ -1,25 +0,0 @@
-#ifndef __ASM_ARM_UNALIGNED_H
-#define __ASM_ARM_UNALIGNED_H
-
-/*
- * We generally want to set CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS on ARMv6+,
- * but we don't want to use linux/unaligned/access_ok.h since that can lead
- * to traps on unaligned stm/ldm or strd/ldrd.
- */
-#include <asm/byteorder.h>
-
-#if defined(__LITTLE_ENDIAN)
-# include <linux/unaligned/le_struct.h>
-# include <linux/unaligned/generic.h>
-# define get_unaligned __get_unaligned_le
-# define put_unaligned __put_unaligned_le
-#elif defined(__BIG_ENDIAN)
-# include <linux/unaligned/be_struct.h>
-# include <linux/unaligned/generic.h>
-# define get_unaligned __get_unaligned_be
-# define put_unaligned __put_unaligned_be
-#else
-# error need to define endianess
-#endif
-
-#endif /* __ASM_ARM_UNALIGNED_H */
diff --git a/arch/mips/crypto/crc32-mips.c b/arch/mips/crypto/crc32-mips.c
index faa88a6a74c0..0a03529cf317 100644
--- a/arch/mips/crypto/crc32-mips.c
+++ b/arch/mips/crypto/crc32-mips.c
@@ -8,13 +8,13 @@
* Copyright (C) 2018 MIPS Tech, LLC
*/
-#include <linux/unaligned/access_ok.h>
#include <linux/cpufeature.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <asm/mipsregs.h>
+#include <asm/unaligned.h>
#include <crypto/internal/hash.h>
diff --git a/include/asm-generic/unaligned.h b/include/asm-generic/unaligned.h
index d79df721ae60..36bf03aaa674 100644
--- a/include/asm-generic/unaligned.h
+++ b/include/asm-generic/unaligned.h
@@ -8,22 +8,13 @@
*/
#include <asm/byteorder.h>
-/* Set by the arch if it can handle unaligned accesses in hardware. */
-#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
-# include <linux/unaligned/access_ok.h>
-#endif
-
#if defined(__LITTLE_ENDIAN)
-# ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
-# include <linux/unaligned/le_struct.h>
-# endif
+# include <linux/unaligned/le_struct.h>
# include <linux/unaligned/generic.h>
# define get_unaligned __get_unaligned_le
# define put_unaligned __put_unaligned_le
#elif defined(__BIG_ENDIAN)
-# ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
-# include <linux/unaligned/be_struct.h>
-# endif
+# include <linux/unaligned/be_struct.h>
# include <linux/unaligned/generic.h>
# define get_unaligned __get_unaligned_be
# define put_unaligned __put_unaligned_be
diff --git a/include/linux/unaligned/access_ok.h b/include/linux/unaligned/access_ok.h
deleted file mode 100644
index 167aa849c0ce..000000000000
--- a/include/linux/unaligned/access_ok.h
+++ /dev/null
@@ -1,68 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_UNALIGNED_ACCESS_OK_H
-#define _LINUX_UNALIGNED_ACCESS_OK_H
-
-#include <linux/kernel.h>
-#include <asm/byteorder.h>
-
-static __always_inline u16 get_unaligned_le16(const void *p)
-{
- return le16_to_cpup((__le16 *)p);
-}
-
-static __always_inline u32 get_unaligned_le32(const void *p)
-{
- return le32_to_cpup((__le32 *)p);
-}
-
-static __always_inline u64 get_unaligned_le64(const void *p)
-{
- return le64_to_cpup((__le64 *)p);
-}
-
-static __always_inline u16 get_unaligned_be16(const void *p)
-{
- return be16_to_cpup((__be16 *)p);
-}
-
-static __always_inline u32 get_unaligned_be32(const void *p)
-{
- return be32_to_cpup((__be32 *)p);
-}
-
-static __always_inline u64 get_unaligned_be64(const void *p)
-{
- return be64_to_cpup((__be64 *)p);
-}
-
-static __always_inline void put_unaligned_le16(u16 val, void *p)
-{
- *((__le16 *)p) = cpu_to_le16(val);
-}
-
-static __always_inline void put_unaligned_le32(u32 val, void *p)
-{
- *((__le32 *)p) = cpu_to_le32(val);
-}
-
-static __always_inline void put_unaligned_le64(u64 val, void *p)
-{
- *((__le64 *)p) = cpu_to_le64(val);
-}
-
-static __always_inline void put_unaligned_be16(u16 val, void *p)
-{
- *((__be16 *)p) = cpu_to_be16(val);
-}
-
-static __always_inline void put_unaligned_be32(u32 val, void *p)
-{
- *((__be32 *)p) = cpu_to_be32(val);
-}
-
-static __always_inline void put_unaligned_be64(u64 val, void *p)
-{
- *((__be64 *)p) = cpu_to_be64(val);
-}
-
-#endif /* _LINUX_UNALIGNED_ACCESS_OK_H */
--
2.29.2
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 50+ messages in thread
* [RFC 08/12] partitions: msdos: fix one-byte get_unaligned()
2021-05-07 22:07 ` Arnd Bergmann
` (9 preceding siblings ...)
(?)
@ 2021-05-07 22:07 ` Arnd Bergmann
-1 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann,
Richard Russon (FlatCap),
Jens Axboe, linux-ntfs-dev, linux-block, linux-kernel
From: Arnd Bergmann <arnd@arndb.de>
A simplification of get_unaligned() clashes with callers that pass
in a character pointer, causing a harmless warning like:
block/partitions/msdos.c: In function 'msdos_partition':
include/asm-generic/unaligned.h:13:22: warning: 'packed' attribute ignored for field of type 'u8' {aka 'unsigned char'} [-Wattributes]
Remove the get_unaligned() call and just use the byte directly.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
block/partitions/ldm.h | 2 +-
block/partitions/msdos.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/block/partitions/ldm.h b/block/partitions/ldm.h
index d8d6beaa72c4..1a77ff09cc5f 100644
--- a/block/partitions/ldm.h
+++ b/block/partitions/ldm.h
@@ -85,7 +85,7 @@ struct parsed_partitions;
#define TOC_BITMAP2 "log" /* bitmaps in the TOCBLOCK. */
/* Borrowed from msdos.c */
-#define SYS_IND(p) (get_unaligned(&(p)->sys_ind))
+#define SYS_IND(p) ((p)->sys_ind)
struct frag { /* VBLK Fragment handling */
struct list_head list;
diff --git a/block/partitions/msdos.c b/block/partitions/msdos.c
index 8f2fcc080264..d78549d7619d 100644
--- a/block/partitions/msdos.c
+++ b/block/partitions/msdos.c
@@ -38,7 +38,7 @@
*/
#include <asm/unaligned.h>
-#define SYS_IND(p) get_unaligned(&p->sys_ind)
+#define SYS_IND(p) (p->sys_ind)
static inline sector_t nr_sects(struct msdos_partition *p)
{
--
2.29.2
^ permalink raw reply related [flat|nested] 50+ messages in thread* [RFC 09/12] apparmor: use get_unaligned() only for multi-byte words
2021-05-07 22:07 ` Arnd Bergmann
` (10 preceding siblings ...)
(?)
@ 2021-05-07 22:07 ` Arnd Bergmann
2021-05-10 8:17 ` John Johansen
-1 siblings, 1 reply; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, John Johansen,
James Morris, Serge E. Hallyn, linux-security-module,
linux-kernel
From: Arnd Bergmann <arnd@arndb.de>
Using get_unaligned() on a u8 pointer is pointless, and will
result in a compiler warning after a planned cleanup:
In file included from arch/x86/include/generated/asm/unaligned.h:1,
from security/apparmor/policy_unpack.c:16:
security/apparmor/policy_unpack.c: In function 'unpack_u8':
include/asm-generic/unaligned.h:13:15: error: 'packed' attribute ignored for field of type 'u8' {aka 'unsigned char'} [-Werror=attributes]
13 | const struct { type x __packed; } *__pptr = (typeof(__pptr))(ptr); \
| ^
Simply dereference this pointer directly.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
security/apparmor/policy_unpack.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c
index b8efbda545cb..0acca6f2a93f 100644
--- a/security/apparmor/policy_unpack.c
+++ b/security/apparmor/policy_unpack.c
@@ -304,7 +304,7 @@ static bool unpack_u8(struct aa_ext *e, u8 *data, const char *name)
if (!inbounds(e, sizeof(u8)))
goto fail;
if (data)
- *data = get_unaligned((u8 *)e->pos);
+ *data = *((u8 *)e->pos);
e->pos += sizeof(u8);
return true;
}
--
2.29.2
^ permalink raw reply related [flat|nested] 50+ messages in thread* Re: [RFC 09/12] apparmor: use get_unaligned() only for multi-byte words
2021-05-07 22:07 ` [RFC 09/12] apparmor: use get_unaligned() only for multi-byte words Arnd Bergmann
@ 2021-05-10 8:17 ` John Johansen
0 siblings, 0 replies; 50+ messages in thread
From: John Johansen @ 2021-05-10 8:17 UTC (permalink / raw)
To: Arnd Bergmann, linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, James Morris,
Serge E. Hallyn, linux-security-module, linux-kernel
On 5/7/21 3:07 PM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> Using get_unaligned() on a u8 pointer is pointless, and will
> result in a compiler warning after a planned cleanup:
>
> In file included from arch/x86/include/generated/asm/unaligned.h:1,
> from security/apparmor/policy_unpack.c:16:
> security/apparmor/policy_unpack.c: In function 'unpack_u8':
> include/asm-generic/unaligned.h:13:15: error: 'packed' attribute ignored for field of type 'u8' {aka 'unsigned char'} [-Werror=attributes]
> 13 | const struct { type x __packed; } *__pptr = (typeof(__pptr))(ptr); \
> | ^
>
> Simply dereference this pointer directly.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: John Johansen <john.johansen@canonical.com>
> ---
> security/apparmor/policy_unpack.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c
> index b8efbda545cb..0acca6f2a93f 100644
> --- a/security/apparmor/policy_unpack.c
> +++ b/security/apparmor/policy_unpack.c
> @@ -304,7 +304,7 @@ static bool unpack_u8(struct aa_ext *e, u8 *data, const char *name)
> if (!inbounds(e, sizeof(u8)))
> goto fail;
> if (data)
> - *data = get_unaligned((u8 *)e->pos);
> + *data = *((u8 *)e->pos);
> e->pos += sizeof(u8);
> return true;
> }
>
^ permalink raw reply [flat|nested] 50+ messages in thread
* [RFC 10/12] mwifiex: re-fix for unaligned accesses
2021-05-07 22:07 ` Arnd Bergmann
` (11 preceding siblings ...)
(?)
@ 2021-05-07 22:07 ` Arnd Bergmann
-1 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, Amitkumar Karwar,
Ganapathi Bhat, Sharvari Harisangam, Xinming Hu, Kalle Valo,
David S. Miller, Jakub Kicinski, Devidas Puranik, linux-wireless,
netdev, linux-kernel
From: Arnd Bergmann <arnd@arndb.de>
A patch from 2017 changed some accesses to DMA memory to use
get_unaligned_le32() and similar interfaces, to avoid problems
with doing unaligned accesson uncached memory.
However, the change in the mwifiex_pcie_alloc_sleep_cookie_buf()
function ended up changing the size of the access instead,
as it operates on a pointer to u8.
Change this function back to actually access the entire 32 bits.
Note that the pointer is aligned by definition because it came
from dma_alloc_coherent().
Fixes: 92c70a958b0b ("mwifiex: fix for unaligned reads")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
drivers/net/wireless/marvell/mwifiex/pcie.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c b/drivers/net/wireless/marvell/mwifiex/pcie.c
index 94228b316df1..46517515ba72 100644
--- a/drivers/net/wireless/marvell/mwifiex/pcie.c
+++ b/drivers/net/wireless/marvell/mwifiex/pcie.c
@@ -1231,7 +1231,7 @@ static int mwifiex_pcie_delete_cmdrsp_buf(struct mwifiex_adapter *adapter)
static int mwifiex_pcie_alloc_sleep_cookie_buf(struct mwifiex_adapter *adapter)
{
struct pcie_service_card *card = adapter->card;
- u32 tmp;
+ u32 *cookie;
card->sleep_cookie_vbase = dma_alloc_coherent(&card->dev->dev,
sizeof(u32),
@@ -1242,13 +1242,11 @@ static int mwifiex_pcie_alloc_sleep_cookie_buf(struct mwifiex_adapter *adapter)
"dma_alloc_coherent failed!\n");
return -ENOMEM;
}
+ cookie = (u32 *)card->sleep_cookie_vbase;
/* Init val of Sleep Cookie */
- tmp = FW_AWAKE_COOKIE;
- put_unaligned(tmp, card->sleep_cookie_vbase);
+ *cookie = FW_AWAKE_COOKIE;
- mwifiex_dbg(adapter, INFO,
- "alloc_scook: sleep cookie=0x%x\n",
- get_unaligned(card->sleep_cookie_vbase));
+ mwifiex_dbg(adapter, INFO, "alloc_scook: sleep cookie=0x%x\n", *cookie);
return 0;
}
--
2.29.2
^ permalink raw reply related [flat|nested] 50+ messages in thread* [RFC 11/12] netpoll: avoid put_unaligned() on single character
2021-05-07 22:07 ` Arnd Bergmann
` (12 preceding siblings ...)
(?)
@ 2021-05-07 22:07 ` Arnd Bergmann
-1 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, David S. Miller,
Jakub Kicinski, Eric Dumazet, Florian Fainelli, Vladimir Oltean,
netdev, linux-kernel
From: Arnd Bergmann <arnd@arndb.de>
With a planned cleanup, using put_unaligned() on a single character
results in a harmless warning:
In file included from ./arch/x86/include/generated/asm/unaligned.h:1,
from include/linux/etherdevice.h:24,
from net/core/netpoll.c:18:
net/core/netpoll.c: In function 'netpoll_send_udp':
include/asm-generic/unaligned.h:23:9: error: 'packed' attribute ignored for field of type 'unsigned char' [-Werror=attributes]
net/core/netpoll.c:431:3: note: in expansion of macro 'put_unaligned'
431 | put_unaligned(0x60, (unsigned char *)ip6h);
| ^~~~~~~~~~~~~
include/asm-generic/unaligned.h:23:9: error: 'packed' attribute ignored for field of type 'unsigned char' [-Werror=attributes]
net/core/netpoll.c:459:3: note: in expansion of macro 'put_unaligned'
459 | put_unaligned(0x45, (unsigned char *)iph);
| ^~~~~~~~~~~~~
Replace this with an open-coded pointer dereference.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
net/core/netpoll.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index c310c7c1cef7..9c49a38fa315 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -428,7 +428,7 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
ip6h = ipv6_hdr(skb);
/* ip6h->version = 6; ip6h->priority = 0; */
- put_unaligned(0x60, (unsigned char *)ip6h);
+ *(unsigned char *)ip6h = 0x60;
ip6h->flow_lbl[0] = 0;
ip6h->flow_lbl[1] = 0;
ip6h->flow_lbl[2] = 0;
@@ -456,7 +456,7 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
iph = ip_hdr(skb);
/* iph->version = 4; iph->ihl = 5; */
- put_unaligned(0x45, (unsigned char *)iph);
+ *(unsigned char *)iph = 0x45;
iph->tos = 0;
put_unaligned(htons(ip_len), &(iph->tot_len));
iph->id = htons(atomic_inc_return(&ip_ident));
--
2.29.2
^ permalink raw reply related [flat|nested] 50+ messages in thread* [RFC 12/12] asm-generic: simplify asm/unaligned.h
2021-05-07 22:07 ` Arnd Bergmann
` (13 preceding siblings ...)
(?)
@ 2021-05-07 22:07 ` Arnd Bergmann
2021-05-07 23:54 ` Linus Torvalds
` (2 more replies)
-1 siblings, 3 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch; +Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, linux-kernel
From: Arnd Bergmann <arnd@arndb.de>
The get_unaligned()/put_unaligned() implementations are much more complex
than necessary, now that all architectures use the same code.
Move everything into one file and use a much more compact way to express
the same logic.
I've compared the binary output using gcc-11 across defconfig builds for
all architectures and found this patch to make no difference, except for
a single function on powerpc that needs two additional register moves
because of random differences in register allocation.
There are a handful of callers of the low-level __get_unaligned_cpu32,
so leave that in place for the time being even though the common code
no longer uses it.
This adds a warning for any caller of get_unaligned()/put_unaligned()
that passes in a single-byte pointer, but I've sent patches for all
instances that show up in x86 and randconfig builds. It would be nice
to change the arguments of the endian-specific accessors to take the
matching __be16/__be32/__be64/__le16/__le32/__le64 arguments instead of
a void pointer, but that requires more changes to the rest of the kernel.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
include/asm-generic/unaligned.h | 138 +++++++++++++++++++++++++---
include/linux/unaligned/be_struct.h | 67 --------------
include/linux/unaligned/generic.h | 115 -----------------------
include/linux/unaligned/le_struct.h | 67 --------------
4 files changed, 125 insertions(+), 262 deletions(-)
delete mode 100644 include/linux/unaligned/be_struct.h
delete mode 100644 include/linux/unaligned/generic.h
delete mode 100644 include/linux/unaligned/le_struct.h
diff --git a/include/asm-generic/unaligned.h b/include/asm-generic/unaligned.h
index 36bf03aaa674..9ed952fba718 100644
--- a/include/asm-generic/unaligned.h
+++ b/include/asm-generic/unaligned.h
@@ -6,20 +6,132 @@
* This is the most generic implementation of unaligned accesses
* and should work almost anywhere.
*/
+#include <linux/unaligned/packed_struct.h>
#include <asm/byteorder.h>
-#if defined(__LITTLE_ENDIAN)
-# include <linux/unaligned/le_struct.h>
-# include <linux/unaligned/generic.h>
-# define get_unaligned __get_unaligned_le
-# define put_unaligned __put_unaligned_le
-#elif defined(__BIG_ENDIAN)
-# include <linux/unaligned/be_struct.h>
-# include <linux/unaligned/generic.h>
-# define get_unaligned __get_unaligned_be
-# define put_unaligned __put_unaligned_be
-#else
-# error need to define endianess
-#endif
+#define __get_unaligned_t(type, ptr) ({ \
+ const struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr); \
+ __pptr->x; \
+})
+
+#define get_unaligned(ptr) ({ \
+ __auto_type __ptr = (ptr); \
+ __get_unaligned_t(typeof(*__ptr), __ptr); \
+})
+
+#define __put_unaligned_t(type, val, ptr) ({ \
+ struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr); \
+ __pptr->x = (val); \
+})
+
+#define put_unaligned(val, ptr) do { \
+ __auto_type __ptr = (ptr); \
+ __put_unaligned_t(typeof(*__ptr), (val), __ptr); \
+} while (0)
+
+
+static inline u16 get_unaligned_le16(const void *p)
+{
+ return le16_to_cpu(__get_unaligned_t(__le16, p));
+}
+
+static inline u32 get_unaligned_le32(const void *p)
+{
+ return le32_to_cpu(__get_unaligned_t(__le32, p));
+}
+
+static inline u64 get_unaligned_le64(const void *p)
+{
+ return le64_to_cpu(__get_unaligned_t(__le64, p));
+}
+
+static inline void put_unaligned_le16(u16 val, void *p)
+{
+ __put_unaligned_t(__le16, cpu_to_le16(val), p);
+}
+
+static inline void put_unaligned_le32(u32 val, void *p)
+{
+ __put_unaligned_t(__le32, cpu_to_le32(val), p);
+}
+
+static inline void put_unaligned_le64(u64 val, void *p)
+{
+ __put_unaligned_t(__le64, cpu_to_le64(val), p);
+}
+
+static inline u16 get_unaligned_be16(const void *p)
+{
+ return be16_to_cpu(__get_unaligned_t(__be16, p));
+}
+
+static inline u32 get_unaligned_be32(const void *p)
+{
+ return be32_to_cpu(__get_unaligned_t(__be32, p));
+}
+
+static inline u64 get_unaligned_be64(const void *p)
+{
+ return be64_to_cpu(__get_unaligned_t(__be64, p));
+}
+
+static inline void put_unaligned_be16(u16 val, void *p)
+{
+ __put_unaligned_t(__be16, cpu_to_be16(val), p);
+}
+
+static inline void put_unaligned_be32(u32 val, void *p)
+{
+ __put_unaligned_t(__be32, cpu_to_be32(val), p);
+}
+
+static inline void put_unaligned_be64(u64 val, void *p)
+{
+ __put_unaligned_t(__be64, cpu_to_be64(val), p);
+}
+
+static inline u32 __get_unaligned_be24(const u8 *p)
+{
+ return p[0] << 16 | p[1] << 8 | p[2];
+}
+
+static inline u32 get_unaligned_be24(const void *p)
+{
+ return __get_unaligned_be24(p);
+}
+
+static inline u32 __get_unaligned_le24(const u8 *p)
+{
+ return p[0] | p[1] << 8 | p[2] << 16;
+}
+
+static inline u32 get_unaligned_le24(const void *p)
+{
+ return __get_unaligned_le24(p);
+}
+
+static inline void __put_unaligned_be24(const u32 val, u8 *p)
+{
+ *p++ = val >> 16;
+ *p++ = val >> 8;
+ *p++ = val;
+}
+
+static inline void put_unaligned_be24(const u32 val, void *p)
+{
+ __put_unaligned_be24(val, p);
+}
+
+static inline void __put_unaligned_le24(const u32 val, u8 *p)
+{
+ *p++ = val;
+ *p++ = val >> 8;
+ *p++ = val >> 16;
+}
+
+static inline void put_unaligned_le24(const u32 val, void *p)
+{
+ __put_unaligned_le24(val, p);
+}
#endif /* __ASM_GENERIC_UNALIGNED_H */
diff --git a/include/linux/unaligned/be_struct.h b/include/linux/unaligned/be_struct.h
deleted file mode 100644
index 76d9fe297c33..000000000000
--- a/include/linux/unaligned/be_struct.h
+++ /dev/null
@@ -1,67 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_UNALIGNED_BE_STRUCT_H
-#define _LINUX_UNALIGNED_BE_STRUCT_H
-
-#include <linux/unaligned/packed_struct.h>
-
-static inline u16 get_unaligned_be16(const void *p)
-{
- return __get_unaligned_cpu16((const u8 *)p);
-}
-
-static inline u32 get_unaligned_be32(const void *p)
-{
- return __get_unaligned_cpu32((const u8 *)p);
-}
-
-static inline u64 get_unaligned_be64(const void *p)
-{
- return __get_unaligned_cpu64((const u8 *)p);
-}
-
-static inline void put_unaligned_be16(u16 val, void *p)
-{
- __put_unaligned_cpu16(val, p);
-}
-
-static inline void put_unaligned_be32(u32 val, void *p)
-{
- __put_unaligned_cpu32(val, p);
-}
-
-static inline void put_unaligned_be64(u64 val, void *p)
-{
- __put_unaligned_cpu64(val, p);
-}
-
-static inline u16 get_unaligned_le16(const void *p)
-{
- return swab16(__get_unaligned_cpu16((const u8 *)p));
-}
-
-static inline u32 get_unaligned_le32(const void *p)
-{
- return swab32(__get_unaligned_cpu32((const u8 *)p));
-}
-
-static inline u64 get_unaligned_le64(const void *p)
-{
- return swab64(__get_unaligned_cpu64((const u8 *)p));
-}
-
-static inline void put_unaligned_le16(u16 val, void *p)
-{
- __put_unaligned_cpu16(swab16(val), p);
-}
-
-static inline void put_unaligned_le32(u32 val, void *p)
-{
- __put_unaligned_cpu32(swab32(val), p);
-}
-
-static inline void put_unaligned_le64(u64 val, void *p)
-{
- __put_unaligned_cpu64(swab64(val), p);
-}
-
-#endif /* _LINUX_UNALIGNED_BE_STRUCT_H */
diff --git a/include/linux/unaligned/generic.h b/include/linux/unaligned/generic.h
deleted file mode 100644
index 303289492859..000000000000
--- a/include/linux/unaligned/generic.h
+++ /dev/null
@@ -1,115 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_UNALIGNED_GENERIC_H
-#define _LINUX_UNALIGNED_GENERIC_H
-
-#include <linux/types.h>
-
-/*
- * Cause a link-time error if we try an unaligned access other than
- * 1,2,4 or 8 bytes long
- */
-extern void __bad_unaligned_access_size(void);
-
-#define __get_unaligned_le(ptr) ((__force typeof(*(ptr)))({ \
- __builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr), \
- __builtin_choose_expr(sizeof(*(ptr)) == 2, get_unaligned_le16((ptr)), \
- __builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_le32((ptr)), \
- __builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_le64((ptr)), \
- __bad_unaligned_access_size())))); \
- }))
-
-#define __get_unaligned_be(ptr) ((__force typeof(*(ptr)))({ \
- __builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr), \
- __builtin_choose_expr(sizeof(*(ptr)) == 2, get_unaligned_be16((ptr)), \
- __builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_be32((ptr)), \
- __builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_be64((ptr)), \
- __bad_unaligned_access_size())))); \
- }))
-
-#define __put_unaligned_le(val, ptr) ({ \
- void *__gu_p = (ptr); \
- switch (sizeof(*(ptr))) { \
- case 1: \
- *(u8 *)__gu_p = (__force u8)(val); \
- break; \
- case 2: \
- put_unaligned_le16((__force u16)(val), __gu_p); \
- break; \
- case 4: \
- put_unaligned_le32((__force u32)(val), __gu_p); \
- break; \
- case 8: \
- put_unaligned_le64((__force u64)(val), __gu_p); \
- break; \
- default: \
- __bad_unaligned_access_size(); \
- break; \
- } \
- (void)0; })
-
-#define __put_unaligned_be(val, ptr) ({ \
- void *__gu_p = (ptr); \
- switch (sizeof(*(ptr))) { \
- case 1: \
- *(u8 *)__gu_p = (__force u8)(val); \
- break; \
- case 2: \
- put_unaligned_be16((__force u16)(val), __gu_p); \
- break; \
- case 4: \
- put_unaligned_be32((__force u32)(val), __gu_p); \
- break; \
- case 8: \
- put_unaligned_be64((__force u64)(val), __gu_p); \
- break; \
- default: \
- __bad_unaligned_access_size(); \
- break; \
- } \
- (void)0; })
-
-static inline u32 __get_unaligned_be24(const u8 *p)
-{
- return p[0] << 16 | p[1] << 8 | p[2];
-}
-
-static inline u32 get_unaligned_be24(const void *p)
-{
- return __get_unaligned_be24(p);
-}
-
-static inline u32 __get_unaligned_le24(const u8 *p)
-{
- return p[0] | p[1] << 8 | p[2] << 16;
-}
-
-static inline u32 get_unaligned_le24(const void *p)
-{
- return __get_unaligned_le24(p);
-}
-
-static inline void __put_unaligned_be24(const u32 val, u8 *p)
-{
- *p++ = val >> 16;
- *p++ = val >> 8;
- *p++ = val;
-}
-
-static inline void put_unaligned_be24(const u32 val, void *p)
-{
- __put_unaligned_be24(val, p);
-}
-
-static inline void __put_unaligned_le24(const u32 val, u8 *p)
-{
- *p++ = val;
- *p++ = val >> 8;
- *p++ = val >> 16;
-}
-
-static inline void put_unaligned_le24(const u32 val, void *p)
-{
- __put_unaligned_le24(val, p);
-}
-
-#endif /* _LINUX_UNALIGNED_GENERIC_H */
diff --git a/include/linux/unaligned/le_struct.h b/include/linux/unaligned/le_struct.h
deleted file mode 100644
index 22f90a4afaa5..000000000000
--- a/include/linux/unaligned/le_struct.h
+++ /dev/null
@@ -1,67 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_UNALIGNED_LE_STRUCT_H
-#define _LINUX_UNALIGNED_LE_STRUCT_H
-
-#include <linux/unaligned/packed_struct.h>
-
-static inline u16 get_unaligned_le16(const void *p)
-{
- return __get_unaligned_cpu16((const u8 *)p);
-}
-
-static inline u32 get_unaligned_le32(const void *p)
-{
- return __get_unaligned_cpu32((const u8 *)p);
-}
-
-static inline u64 get_unaligned_le64(const void *p)
-{
- return __get_unaligned_cpu64((const u8 *)p);
-}
-
-static inline void put_unaligned_le16(u16 val, void *p)
-{
- __put_unaligned_cpu16(val, p);
-}
-
-static inline void put_unaligned_le32(u32 val, void *p)
-{
- __put_unaligned_cpu32(val, p);
-}
-
-static inline void put_unaligned_le64(u64 val, void *p)
-{
- __put_unaligned_cpu64(val, p);
-}
-
-static inline u16 get_unaligned_be16(const void *p)
-{
- return swab16(__get_unaligned_cpu16((const u8 *)p));
-}
-
-static inline u32 get_unaligned_be32(const void *p)
-{
- return swab32(__get_unaligned_cpu32((const u8 *)p));
-}
-
-static inline u64 get_unaligned_be64(const void *p)
-{
- return swab64(__get_unaligned_cpu64((const u8 *)p));
-}
-
-static inline void put_unaligned_be16(u16 val, void *p)
-{
- __put_unaligned_cpu16(swab16(val), p);
-}
-
-static inline void put_unaligned_be32(u32 val, void *p)
-{
- __put_unaligned_cpu32(swab32(val), p);
-}
-
-static inline void put_unaligned_be64(u64 val, void *p)
-{
- __put_unaligned_cpu64(swab64(val), p);
-}
-
-#endif /* _LINUX_UNALIGNED_LE_STRUCT_H */
--
2.29.2
^ permalink raw reply related [flat|nested] 50+ messages in thread* Re: [RFC 12/12] asm-generic: simplify asm/unaligned.h
2021-05-07 22:07 ` [RFC 12/12] asm-generic: simplify asm/unaligned.h Arnd Bergmann
@ 2021-05-07 23:54 ` Linus Torvalds
2021-05-08 9:28 ` Arnd Bergmann
2021-05-08 11:03 ` David Laight
2021-05-10 6:39 ` Geert Uytterhoeven
2 siblings, 1 reply; 50+ messages in thread
From: Linus Torvalds @ 2021-05-07 23:54 UTC (permalink / raw)
To: Arnd Bergmann
Cc: linux-arch, Vineet Gupta, Arnd Bergmann, Linux Kernel Mailing List
On Fri, May 7, 2021 at 3:12 PM Arnd Bergmann <arnd@kernel.org> wrote:
>
> From: Arnd Bergmann <arnd@arndb.de>
>
> The get_unaligned()/put_unaligned() implementations are much more complex
> than necessary, now that all architectures use the same code.
Thanks for doing this, it looks good to me.
I suspect it's still slightly unnecessarily complicated - why is that
get_unaligned() not just
#define get_unaligned(ptr) \
__get_unaligned_t(typeof(*__ptr), __ptr)
Because I'm not seeing the reason for doing that "__auto_type __ptr"
thing - the argument to a "typeof()" isn't actually evaluated.
Maybe I'm just nit-picking, this certainly is a huge improvement regardless.
Linus
^ permalink raw reply [flat|nested] 50+ messages in thread* Re: [RFC 12/12] asm-generic: simplify asm/unaligned.h
2021-05-07 23:54 ` Linus Torvalds
@ 2021-05-08 9:28 ` Arnd Bergmann
2021-05-08 15:23 ` Linus Torvalds
0 siblings, 1 reply; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-08 9:28 UTC (permalink / raw)
To: Linus Torvalds; +Cc: linux-arch, Vineet Gupta, Linux Kernel Mailing List
On Sat, May 8, 2021 at 1:54 AM Linus Torvalds
<torvalds@linux-foundation.org> wrote:
> On Fri, May 7, 2021 at 3:12 PM Arnd Bergmann <arnd@kernel.org> wrote:
> >
> > From: Arnd Bergmann <arnd@arndb.de>
> >
> > The get_unaligned()/put_unaligned() implementations are much more complex
> > than necessary, now that all architectures use the same code.
>
> Thanks for doing this, it looks good to me.
>
> I suspect it's still slightly unnecessarily complicated - why is that
> get_unaligned() not just
>
> #define get_unaligned(ptr) \
> __get_unaligned_t(typeof(*__ptr), __ptr)
>
> Because I'm not seeing the reason for doing that "__auto_type __ptr"
> thing - the argument to a "typeof()" isn't actually evaluated.
Both versions are equally correct, I picked the __auto_type version
because this tends to produce smaller preprocessor output when you have
multiple layers of nested macros with 'ptr' expanding to something
complicated, and the get_unaligned() itself being expanded multiple
times again.
When I recently experimented with possible changes to cmpxchg() and
get_user(), it had a measurable impact on compile time with clang on
those macros.
get_unaligned() doesn't appear to be used much in nested macros
at all, so it probably won't actually help here, and I can just do the
simpler version instead.
I forgot to mention in the changelog that this version does not actually
require the argument to be a scalar, not sure if this is something
we want or not. It does allow developers to write something like
__be32 get_ip_saddr(struct sk_buff *skb)
{
struct iphdr *iph = ip_hdr(skb);
return get_unaligned(iph).saddr;
}
and get the expected result. While this seems handy, it also makes it
harder to change the macro back to one that only works on scalars
after such usage becomes widespread.
Arnd
^ permalink raw reply [flat|nested] 50+ messages in thread* Re: [RFC 12/12] asm-generic: simplify asm/unaligned.h
2021-05-08 9:28 ` Arnd Bergmann
@ 2021-05-08 15:23 ` Linus Torvalds
0 siblings, 0 replies; 50+ messages in thread
From: Linus Torvalds @ 2021-05-08 15:23 UTC (permalink / raw)
To: Arnd Bergmann; +Cc: linux-arch, Vineet Gupta, Linux Kernel Mailing List
On Sat, May 8, 2021 at 2:29 AM Arnd Bergmann <arnd@kernel.org> wrote:
>
> On Sat, May 8, 2021 at 1:54 AM Linus Torvalds
> <torvalds@linux-foundation.org> wrote:
> >
> > #define get_unaligned(ptr) \
> > __get_unaligned_t(typeof(*__ptr), __ptr)
That's missing a set of parentheses around that __ptr thing ('*__ptr'
should be '*(__ptr)'), btw, so don't use that as-is.
> Both versions are equally correct, I picked the __auto_type version
> because this tends to produce smaller preprocessor output when you have
> multiple layers of nested macros with 'ptr' expanding to something
> complicated,
Ahh.
Yeah, that's probably not a problem for get_unaligned(), but it might
happen in other situations.
Linus
^ permalink raw reply [flat|nested] 50+ messages in thread
* RE: [RFC 12/12] asm-generic: simplify asm/unaligned.h
2021-05-07 22:07 ` [RFC 12/12] asm-generic: simplify asm/unaligned.h Arnd Bergmann
2021-05-07 23:54 ` Linus Torvalds
@ 2021-05-08 11:03 ` David Laight
2021-05-08 14:18 ` David Laight
2021-05-10 6:39 ` Geert Uytterhoeven
2 siblings, 1 reply; 50+ messages in thread
From: David Laight @ 2021-05-08 11:03 UTC (permalink / raw)
To: 'Arnd Bergmann', linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, linux-kernel
From: Arnd Bergmann
> Sent: 07 May 2021 23:08
>
> The get_unaligned()/put_unaligned() implementations are much more complex
> than necessary, now that all architectures use the same code.
>
...
> +#define __get_unaligned_t(type, ptr) ({ \
> + const struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr); \
> + __pptr->x; \
> +})
I thought gcc was likely to track through the alignment of the
variable holding the source pointer (through any (void *) casts
implied by inlined function calls) through to the pointer used
for the actual access - so it would tend to issue a single
instruction that assumed an aligned address.
I know that has caused grief trying to copy unaligned data
to an aligned structure.
Possibly adding:
asm ("" :: "+r" (__pptr)) );
in the middle stops that assumption without generating any code.
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
^ permalink raw reply [flat|nested] 50+ messages in thread* RE: [RFC 12/12] asm-generic: simplify asm/unaligned.h
2021-05-08 11:03 ` David Laight
@ 2021-05-08 14:18 ` David Laight
0 siblings, 0 replies; 50+ messages in thread
From: David Laight @ 2021-05-08 14:18 UTC (permalink / raw)
To: 'Arnd Bergmann', 'linux-arch@vger.kernel.org'
Cc: 'Linus Torvalds', 'Vineet Gupta',
'Arnd Bergmann', 'linux-kernel@vger.kernel.org'
From: David Laight
> Sent: 08 May 2021 12:03
>
> From: Arnd Bergmann
> > Sent: 07 May 2021 23:08
> >
> > The get_unaligned()/put_unaligned() implementations are much more complex
> > than necessary, now that all architectures use the same code.
> >
> ...
> > +#define __get_unaligned_t(type, ptr) ({ \
> > + const struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr); \
> > + __pptr->x; \
> > +})
>
> I thought gcc was likely to track through the alignment of the
> variable holding the source pointer (through any (void *) casts
> implied by inlined function calls) through to the pointer used
> for the actual access - so it would tend to issue a single
> instruction that assumed an aligned address.
>
> I know that has caused grief trying to copy unaligned data
> to an aligned structure.
>
> Possibly adding:
> asm ("" :: "+r" (__pptr)) );
> in the middle stops that assumption without generating any code.
That is the wrong asm.
You need the one where an input operand and output operand
share the same register and use it for the assignment.
I've been trying to get godbolt to do something useful.
But it seems to be stuck in C++ mode and is missing something like
sparc which definitely doesn't do misaligned accesses.
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
^ permalink raw reply [flat|nested] 50+ messages in thread
* Re: [RFC 12/12] asm-generic: simplify asm/unaligned.h
2021-05-07 22:07 ` [RFC 12/12] asm-generic: simplify asm/unaligned.h Arnd Bergmann
2021-05-07 23:54 ` Linus Torvalds
2021-05-08 11:03 ` David Laight
@ 2021-05-10 6:39 ` Geert Uytterhoeven
2 siblings, 0 replies; 50+ messages in thread
From: Geert Uytterhoeven @ 2021-05-10 6:39 UTC (permalink / raw)
To: Arnd Bergmann
Cc: Linux-Arch, Linus Torvalds, Vineet Gupta, Arnd Bergmann,
Linux Kernel Mailing List
Hi Arnd,
On Sat, May 8, 2021 at 12:12 AM Arnd Bergmann <arnd@kernel.org> wrote:
> The get_unaligned()/put_unaligned() implementations are much more complex
> than necessary, now that all architectures use the same code.
>
> Move everything into one file and use a much more compact way to express
> the same logic.
>
> I've compared the binary output using gcc-11 across defconfig builds for
> all architectures and found this patch to make no difference, except for
> a single function on powerpc that needs two additional register moves
> because of random differences in register allocation.
>
> There are a handful of callers of the low-level __get_unaligned_cpu32,
> so leave that in place for the time being even though the common code
> no longer uses it.
>
> This adds a warning for any caller of get_unaligned()/put_unaligned()
> that passes in a single-byte pointer, but I've sent patches for all
> instances that show up in x86 and randconfig builds. It would be nice
> to change the arguments of the endian-specific accessors to take the
> matching __be16/__be32/__be64/__le16/__le32/__le64 arguments instead of
> a void pointer, but that requires more changes to the rest of the kernel.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Thanks for your patch!
> @@ -6,20 +6,132 @@
> * This is the most generic implementation of unaligned accesses
> * and should work almost anywhere.
> */
> +#include <linux/unaligned/packed_struct.h>
> #include <asm/byteorder.h>
>
> -#if defined(__LITTLE_ENDIAN)
> -# include <linux/unaligned/le_struct.h>
> -# include <linux/unaligned/generic.h>
> -# define get_unaligned __get_unaligned_le
> -# define put_unaligned __put_unaligned_le
> -#elif defined(__BIG_ENDIAN)
> -# include <linux/unaligned/be_struct.h>
> -# include <linux/unaligned/generic.h>
> -# define get_unaligned __get_unaligned_be
> -# define put_unaligned __put_unaligned_be
> -#else
> -# error need to define endianess
> -#endif
> +#define __get_unaligned_t(type, ptr) ({ \
> + const struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr); \
> + __pptr->x; \
Space before tab (cfr. checkpatch).
> +})
> +
> +#define get_unaligned(ptr) ({ \
> + __auto_type __ptr = (ptr); \
> + __get_unaligned_t(typeof(*__ptr), __ptr); \
> +})
> +
> +#define __put_unaligned_t(type, val, ptr) ({ \
> + struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr); \
> + __pptr->x = (val); \
Likewise
> +})
>
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply [flat|nested] 50+ messages in thread
* [RFC 0/12] Unify asm/unaligned.h around struct helper
2021-05-07 22:07 ` Arnd Bergmann
(?)
(?)
@ 2021-05-07 22:07 ` Arnd Bergmann
-1 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, Amitkumar Karwar,
Benjamin Herrenschmidt, Borislav Petkov, Eric Dumazet,
Florian Fainelli, Ganapathi Bhat, Geert Uytterhoeven,
H. Peter Anvin, Ingo Molnar, Jakub Kicinski, James Morris,
Jens Axboe, John Johansen, Jonas Bonn, Kalle Valo,
Michael Ellerman, Paul Mackerras, Rich Felker,
Richard Russon (FlatCap),
Russell King, Serge E. Hallyn, Sharvari Harisangam,
Stafford Horne, Stefan Kristiansson, Thomas Gleixner,
Vladimir Oltean, Xinming Hu, Yoshinori Sato, x86, linux-kernel,
linux-arm-kernel, linux-m68k, linux-crypto, openrisc,
linuxppc-dev, linux-sh, sparclinux, linux-ntfs-dev, linux-block,
linux-wireless, netdev, linux-security-module
From: Arnd Bergmann <arnd@arndb.de>
The get_unaligned()/put_unaligned() helpers are traditionally architecture
specific, with the two main variants being the "access-ok.h" version
that assumes unaligned pointer accesses always work on a particular
architecture, and the "le-struct.h" version that casts the data to a
byte aligned type before dereferencing, for architectures that cannot
always do unaligned accesses in hardware.
Based on the discussion linked below, it appears that the access-ok
version is not realiable on any architecture, but the struct version
probably has no downsides. This series changes the code to use the
same implementation on all architectures, addressing the few exceptions
separately.
I've pushed the patches to the asm-generic git tree for testing.
Arnd
Link: https://lore.kernel.org/lkml/75d07691-1e4f-741f-9852-38c0b4f520bc@synopsys.com/
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100363
Link: git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git unaligned-rework
Arnd Bergmann (12):
asm-generic: use asm-generic/unaligned.h for most architectures
openrisc: always use unaligned-struct header
sh: remove unaligned access for sh4a
m68k: select CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
powerpc: use linux/unaligned/le_struct.h on LE power7
asm-generic: unaligned: remove byteshift helpers
asm-generic: unaligned always use struct helpers
partitions: msdos: fix one-byte get_unaligned()
apparmor: use get_unaligned() only for multi-byte words
mwifiex: re-fix for unaligned accesses
netpoll: avoid put_unaligned() on single character
asm-generic: simplify asm/unaligned.h
arch/alpha/include/asm/unaligned.h | 12 --
arch/arm/include/asm/unaligned.h | 27 ---
arch/ia64/include/asm/unaligned.h | 12 --
arch/m68k/Kconfig | 1 +
arch/m68k/include/asm/unaligned.h | 26 ---
arch/microblaze/include/asm/unaligned.h | 27 ---
arch/mips/crypto/crc32-mips.c | 2 +-
arch/openrisc/include/asm/unaligned.h | 47 -----
arch/parisc/include/asm/unaligned.h | 6 +-
arch/powerpc/include/asm/unaligned.h | 22 ---
arch/sh/include/asm/unaligned-sh4a.h | 199 --------------------
arch/sh/include/asm/unaligned.h | 13 --
arch/sparc/include/asm/unaligned.h | 11 --
arch/x86/include/asm/unaligned.h | 15 --
arch/xtensa/include/asm/unaligned.h | 29 ---
block/partitions/ldm.h | 2 +-
block/partitions/msdos.c | 2 +-
drivers/net/wireless/marvell/mwifiex/pcie.c | 10 +-
include/asm-generic/unaligned.h | 149 ++++++++++++---
include/linux/unaligned/access_ok.h | 68 -------
include/linux/unaligned/be_byteshift.h | 71 -------
include/linux/unaligned/be_memmove.h | 37 ----
include/linux/unaligned/be_struct.h | 37 ----
include/linux/unaligned/generic.h | 115 -----------
include/linux/unaligned/le_byteshift.h | 71 -------
include/linux/unaligned/le_memmove.h | 37 ----
include/linux/unaligned/le_struct.h | 37 ----
include/linux/unaligned/memmove.h | 46 -----
net/core/netpoll.c | 4 +-
security/apparmor/policy_unpack.c | 2 +-
30 files changed, 137 insertions(+), 1000 deletions(-)
delete mode 100644 arch/alpha/include/asm/unaligned.h
delete mode 100644 arch/arm/include/asm/unaligned.h
delete mode 100644 arch/ia64/include/asm/unaligned.h
delete mode 100644 arch/m68k/include/asm/unaligned.h
delete mode 100644 arch/microblaze/include/asm/unaligned.h
delete mode 100644 arch/openrisc/include/asm/unaligned.h
delete mode 100644 arch/powerpc/include/asm/unaligned.h
delete mode 100644 arch/sh/include/asm/unaligned-sh4a.h
delete mode 100644 arch/sh/include/asm/unaligned.h
delete mode 100644 arch/sparc/include/asm/unaligned.h
delete mode 100644 arch/x86/include/asm/unaligned.h
delete mode 100644 arch/xtensa/include/asm/unaligned.h
delete mode 100644 include/linux/unaligned/access_ok.h
delete mode 100644 include/linux/unaligned/be_byteshift.h
delete mode 100644 include/linux/unaligned/be_memmove.h
delete mode 100644 include/linux/unaligned/be_struct.h
delete mode 100644 include/linux/unaligned/generic.h
delete mode 100644 include/linux/unaligned/le_byteshift.h
delete mode 100644 include/linux/unaligned/le_memmove.h
delete mode 100644 include/linux/unaligned/le_struct.h
delete mode 100644 include/linux/unaligned/memmove.h
Cc: Amitkumar Karwar <amitkarwar@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Ganapathi Bhat <ganapathi017@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: James Morris <jmorris@namei.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: John Johansen <john.johansen@canonical.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Rich Felker <dalias@libc.org>
Cc: "Richard Russon (FlatCap)" <ldm@flatcap.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Cc: Sharvari Harisangam <sharvari.harisangam@nxp.com>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vladimir Oltean <vladimir.oltean@nxp.com>
Cc: Xinming Hu <huxinming820@gmail.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: x86@kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-m68k@lists.linux-m68k.org
Cc: linux-crypto@vger.kernel.org
Cc: openrisc@lists.librecores.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-sh@vger.kernel.org
Cc: sparclinux@vger.kernel.org
Cc: linux-ntfs-dev@lists.sourceforge.net
Cc: linux-block@vger.kernel.org
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-security-module@vger.kernel.org
--
2.29.2
^ permalink raw reply [flat|nested] 50+ messages in thread
* [OpenRISC] [RFC 0/12] Unify asm/unaligned.h around struct helper
@ 2021-05-07 22:07 ` Arnd Bergmann
0 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: openrisc
From: Arnd Bergmann <arnd@arndb.de>
The get_unaligned()/put_unaligned() helpers are traditionally architecture
specific, with the two main variants being the "access-ok.h" version
that assumes unaligned pointer accesses always work on a particular
architecture, and the "le-struct.h" version that casts the data to a
byte aligned type before dereferencing, for architectures that cannot
always do unaligned accesses in hardware.
Based on the discussion linked below, it appears that the access-ok
version is not realiable on any architecture, but the struct version
probably has no downsides. This series changes the code to use the
same implementation on all architectures, addressing the few exceptions
separately.
I've pushed the patches to the asm-generic git tree for testing.
Arnd
Link: https://lore.kernel.org/lkml/75d07691-1e4f-741f-9852-38c0b4f520bc at synopsys.com/
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100363
Link: git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git unaligned-rework
Arnd Bergmann (12):
asm-generic: use asm-generic/unaligned.h for most architectures
openrisc: always use unaligned-struct header
sh: remove unaligned access for sh4a
m68k: select CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
powerpc: use linux/unaligned/le_struct.h on LE power7
asm-generic: unaligned: remove byteshift helpers
asm-generic: unaligned always use struct helpers
partitions: msdos: fix one-byte get_unaligned()
apparmor: use get_unaligned() only for multi-byte words
mwifiex: re-fix for unaligned accesses
netpoll: avoid put_unaligned() on single character
asm-generic: simplify asm/unaligned.h
arch/alpha/include/asm/unaligned.h | 12 --
arch/arm/include/asm/unaligned.h | 27 ---
arch/ia64/include/asm/unaligned.h | 12 --
arch/m68k/Kconfig | 1 +
arch/m68k/include/asm/unaligned.h | 26 ---
arch/microblaze/include/asm/unaligned.h | 27 ---
arch/mips/crypto/crc32-mips.c | 2 +-
arch/openrisc/include/asm/unaligned.h | 47 -----
arch/parisc/include/asm/unaligned.h | 6 +-
arch/powerpc/include/asm/unaligned.h | 22 ---
arch/sh/include/asm/unaligned-sh4a.h | 199 --------------------
arch/sh/include/asm/unaligned.h | 13 --
arch/sparc/include/asm/unaligned.h | 11 --
arch/x86/include/asm/unaligned.h | 15 --
arch/xtensa/include/asm/unaligned.h | 29 ---
block/partitions/ldm.h | 2 +-
block/partitions/msdos.c | 2 +-
drivers/net/wireless/marvell/mwifiex/pcie.c | 10 +-
include/asm-generic/unaligned.h | 149 ++++++++++++---
include/linux/unaligned/access_ok.h | 68 -------
include/linux/unaligned/be_byteshift.h | 71 -------
include/linux/unaligned/be_memmove.h | 37 ----
include/linux/unaligned/be_struct.h | 37 ----
include/linux/unaligned/generic.h | 115 -----------
include/linux/unaligned/le_byteshift.h | 71 -------
include/linux/unaligned/le_memmove.h | 37 ----
include/linux/unaligned/le_struct.h | 37 ----
include/linux/unaligned/memmove.h | 46 -----
net/core/netpoll.c | 4 +-
security/apparmor/policy_unpack.c | 2 +-
30 files changed, 137 insertions(+), 1000 deletions(-)
delete mode 100644 arch/alpha/include/asm/unaligned.h
delete mode 100644 arch/arm/include/asm/unaligned.h
delete mode 100644 arch/ia64/include/asm/unaligned.h
delete mode 100644 arch/m68k/include/asm/unaligned.h
delete mode 100644 arch/microblaze/include/asm/unaligned.h
delete mode 100644 arch/openrisc/include/asm/unaligned.h
delete mode 100644 arch/powerpc/include/asm/unaligned.h
delete mode 100644 arch/sh/include/asm/unaligned-sh4a.h
delete mode 100644 arch/sh/include/asm/unaligned.h
delete mode 100644 arch/sparc/include/asm/unaligned.h
delete mode 100644 arch/x86/include/asm/unaligned.h
delete mode 100644 arch/xtensa/include/asm/unaligned.h
delete mode 100644 include/linux/unaligned/access_ok.h
delete mode 100644 include/linux/unaligned/be_byteshift.h
delete mode 100644 include/linux/unaligned/be_memmove.h
delete mode 100644 include/linux/unaligned/be_struct.h
delete mode 100644 include/linux/unaligned/generic.h
delete mode 100644 include/linux/unaligned/le_byteshift.h
delete mode 100644 include/linux/unaligned/le_memmove.h
delete mode 100644 include/linux/unaligned/le_struct.h
delete mode 100644 include/linux/unaligned/memmove.h
Cc: Amitkumar Karwar <amitkarwar@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Ganapathi Bhat <ganapathi017@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: James Morris <jmorris@namei.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: John Johansen <john.johansen@canonical.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Rich Felker <dalias@libc.org>
Cc: "Richard Russon (FlatCap)" <ldm@flatcap.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Cc: Sharvari Harisangam <sharvari.harisangam@nxp.com>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vladimir Oltean <vladimir.oltean@nxp.com>
Cc: Xinming Hu <huxinming820@gmail.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: x86 at kernel.org
Cc: linux-kernel at vger.kernel.org
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-m68k at lists.linux-m68k.org
Cc: linux-crypto at vger.kernel.org
Cc: openrisc at lists.librecores.org
Cc: linuxppc-dev at lists.ozlabs.org
Cc: linux-sh at vger.kernel.org
Cc: sparclinux at vger.kernel.org
Cc: linux-ntfs-dev at lists.sourceforge.net
Cc: linux-block at vger.kernel.org
Cc: linux-wireless at vger.kernel.org
Cc: netdev at vger.kernel.org
Cc: linux-arch at vger.kernel.org
Cc: linux-security-module at vger.kernel.org
--
2.29.2
^ permalink raw reply [flat|nested] 50+ messages in thread
* [RFC 0/12] Unify asm/unaligned.h around struct helper
@ 2021-05-07 22:07 ` Arnd Bergmann
0 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch
Cc: Linus Torvalds, Vineet Gupta, Arnd Bergmann, Amitkumar Karwar,
Benjamin Herrenschmidt, Borislav Petkov, Eric Dumazet,
Florian Fainelli, Ganapathi Bhat, Geert Uytterhoeven,
H. Peter Anvin, Ingo Molnar, Jakub Kicinski, James Morris,
Jens Axboe, John Johansen, Jonas Bonn, Kalle Valo,
Michael Ellerman, Paul Mackerras, Rich Felker,
Richard Russon (FlatCap),
Russell King, Serge E. Hallyn, Sharvari Harisangam,
Stafford Horne, Stefan Kristiansson, Thomas Gleixner,
Vladimir Oltean, Xinming Hu, Yoshinori Sato, x86, linux-kernel,
linux-arm-kernel, linux-m68k, linux-crypto, openrisc,
linuxppc-dev, linux-sh, sparclinux, linux-ntfs-dev, linux-block,
linux-wireless, netdev, linux-security-module
From: Arnd Bergmann <arnd@arndb.de>
The get_unaligned()/put_unaligned() helpers are traditionally architecture
specific, with the two main variants being the "access-ok.h" version
that assumes unaligned pointer accesses always work on a particular
architecture, and the "le-struct.h" version that casts the data to a
byte aligned type before dereferencing, for architectures that cannot
always do unaligned accesses in hardware.
Based on the discussion linked below, it appears that the access-ok
version is not realiable on any architecture, but the struct version
probably has no downsides. This series changes the code to use the
same implementation on all architectures, addressing the few exceptions
separately.
I've pushed the patches to the asm-generic git tree for testing.
Arnd
Link: https://lore.kernel.org/lkml/75d07691-1e4f-741f-9852-38c0b4f520bc@synopsys.com/
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100363
Link: git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git unaligned-rework
Arnd Bergmann (12):
asm-generic: use asm-generic/unaligned.h for most architectures
openrisc: always use unaligned-struct header
sh: remove unaligned access for sh4a
m68k: select CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
powerpc: use linux/unaligned/le_struct.h on LE power7
asm-generic: unaligned: remove byteshift helpers
asm-generic: unaligned always use struct helpers
partitions: msdos: fix one-byte get_unaligned()
apparmor: use get_unaligned() only for multi-byte words
mwifiex: re-fix for unaligned accesses
netpoll: avoid put_unaligned() on single character
asm-generic: simplify asm/unaligned.h
arch/alpha/include/asm/unaligned.h | 12 --
arch/arm/include/asm/unaligned.h | 27 ---
arch/ia64/include/asm/unaligned.h | 12 --
arch/m68k/Kconfig | 1 +
arch/m68k/include/asm/unaligned.h | 26 ---
arch/microblaze/include/asm/unaligned.h | 27 ---
arch/mips/crypto/crc32-mips.c | 2 +-
arch/openrisc/include/asm/unaligned.h | 47 -----
arch/parisc/include/asm/unaligned.h | 6 +-
arch/powerpc/include/asm/unaligned.h | 22 ---
arch/sh/include/asm/unaligned-sh4a.h | 199 --------------------
arch/sh/include/asm/unaligned.h | 13 --
arch/sparc/include/asm/unaligned.h | 11 --
arch/x86/include/asm/unaligned.h | 15 --
arch/xtensa/include/asm/unaligned.h | 29 ---
block/partitions/ldm.h | 2 +-
block/partitions/msdos.c | 2 +-
drivers/net/wireless/marvell/mwifiex/pcie.c | 10 +-
include/asm-generic/unaligned.h | 149 ++++++++++++---
include/linux/unaligned/access_ok.h | 68 -------
include/linux/unaligned/be_byteshift.h | 71 -------
include/linux/unaligned/be_memmove.h | 37 ----
include/linux/unaligned/be_struct.h | 37 ----
include/linux/unaligned/generic.h | 115 -----------
include/linux/unaligned/le_byteshift.h | 71 -------
include/linux/unaligned/le_memmove.h | 37 ----
include/linux/unaligned/le_struct.h | 37 ----
include/linux/unaligned/memmove.h | 46 -----
net/core/netpoll.c | 4 +-
security/apparmor/policy_unpack.c | 2 +-
30 files changed, 137 insertions(+), 1000 deletions(-)
delete mode 100644 arch/alpha/include/asm/unaligned.h
delete mode 100644 arch/arm/include/asm/unaligned.h
delete mode 100644 arch/ia64/include/asm/unaligned.h
delete mode 100644 arch/m68k/include/asm/unaligned.h
delete mode 100644 arch/microblaze/include/asm/unaligned.h
delete mode 100644 arch/openrisc/include/asm/unaligned.h
delete mode 100644 arch/powerpc/include/asm/unaligned.h
delete mode 100644 arch/sh/include/asm/unaligned-sh4a.h
delete mode 100644 arch/sh/include/asm/unaligned.h
delete mode 100644 arch/sparc/include/asm/unaligned.h
delete mode 100644 arch/x86/include/asm/unaligned.h
delete mode 100644 arch/xtensa/include/asm/unaligned.h
delete mode 100644 include/linux/unaligned/access_ok.h
delete mode 100644 include/linux/unaligned/be_byteshift.h
delete mode 100644 include/linux/unaligned/be_memmove.h
delete mode 100644 include/linux/unaligned/be_struct.h
delete mode 100644 include/linux/unaligned/generic.h
delete mode 100644 include/linux/unaligned/le_byteshift.h
delete mode 100644 include/linux/unaligned/le_memmove.h
delete mode 100644 include/linux/unaligned/le_struct.h
delete mode 100644 include/linux/unaligned/memmove.h
Cc: Amitkumar Karwar <amitkarwar@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Ganapathi Bhat <ganapathi017@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: James Morris <jmorris@namei.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: John Johansen <john.johansen@canonical.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Rich Felker <dalias@libc.org>
Cc: "Richard Russon (FlatCap)" <ldm@flatcap.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Cc: Sharvari Harisangam <sharvari.harisangam@nxp.com>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vladimir Oltean <vladimir.oltean@nxp.com>
Cc: Xinming Hu <huxinming820@gmail.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: x86@kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-m68k@lists.linux-m68k.org
Cc: linux-crypto@vger.kernel.org
Cc: openrisc@lists.librecores.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-sh@vger.kernel.org
Cc: sparclinux@vger.kernel.org
Cc: linux-ntfs-dev@lists.sourceforge.net
Cc: linux-block@vger.kernel.org
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-security-module@vger.kernel.org
--
2.29.2
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 50+ messages in thread
* [RFC 0/12] Unify asm/unaligned.h around struct helper
@ 2021-05-07 22:07 ` Arnd Bergmann
0 siblings, 0 replies; 50+ messages in thread
From: Arnd Bergmann @ 2021-05-07 22:07 UTC (permalink / raw)
To: linux-arch
Cc: Rich Felker, linux-sh, Richard Russon (FlatCap),
Amitkumar Karwar, Russell King, Eric Dumazet, Paul Mackerras,
H. Peter Anvin, sparclinux, Thomas Gleixner, Jonas Bonn,
Florian Fainelli, Yoshinori Sato, x86, James Morris, Ingo Molnar,
Geert Uytterhoeven, linux-arm-kernel, Jakub Kicinski,
Serge E. Hallyn, Arnd Bergmann, Ganapathi Bhat, linuxppc-dev,
Stefan Kristiansson, linux-block, linux-m68k, openrisc,
Borislav Petkov, Stafford Horne, Kalle Valo, Jens Axboe,
John Johansen, Xinming Hu, Vineet Gupta, linux-wireless,
linux-kernel, Vladimir Oltean, linux-ntfs-dev,
linux-security-module, linux-crypto, netdev, Linus Torvalds,
Sharvari Harisangam
From: Arnd Bergmann <arnd@arndb.de>
The get_unaligned()/put_unaligned() helpers are traditionally architecture
specific, with the two main variants being the "access-ok.h" version
that assumes unaligned pointer accesses always work on a particular
architecture, and the "le-struct.h" version that casts the data to a
byte aligned type before dereferencing, for architectures that cannot
always do unaligned accesses in hardware.
Based on the discussion linked below, it appears that the access-ok
version is not realiable on any architecture, but the struct version
probably has no downsides. This series changes the code to use the
same implementation on all architectures, addressing the few exceptions
separately.
I've pushed the patches to the asm-generic git tree for testing.
Arnd
Link: https://lore.kernel.org/lkml/75d07691-1e4f-741f-9852-38c0b4f520bc@synopsys.com/
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100363
Link: git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git unaligned-rework
Arnd Bergmann (12):
asm-generic: use asm-generic/unaligned.h for most architectures
openrisc: always use unaligned-struct header
sh: remove unaligned access for sh4a
m68k: select CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
powerpc: use linux/unaligned/le_struct.h on LE power7
asm-generic: unaligned: remove byteshift helpers
asm-generic: unaligned always use struct helpers
partitions: msdos: fix one-byte get_unaligned()
apparmor: use get_unaligned() only for multi-byte words
mwifiex: re-fix for unaligned accesses
netpoll: avoid put_unaligned() on single character
asm-generic: simplify asm/unaligned.h
arch/alpha/include/asm/unaligned.h | 12 --
arch/arm/include/asm/unaligned.h | 27 ---
arch/ia64/include/asm/unaligned.h | 12 --
arch/m68k/Kconfig | 1 +
arch/m68k/include/asm/unaligned.h | 26 ---
arch/microblaze/include/asm/unaligned.h | 27 ---
arch/mips/crypto/crc32-mips.c | 2 +-
arch/openrisc/include/asm/unaligned.h | 47 -----
arch/parisc/include/asm/unaligned.h | 6 +-
arch/powerpc/include/asm/unaligned.h | 22 ---
arch/sh/include/asm/unaligned-sh4a.h | 199 --------------------
arch/sh/include/asm/unaligned.h | 13 --
arch/sparc/include/asm/unaligned.h | 11 --
arch/x86/include/asm/unaligned.h | 15 --
arch/xtensa/include/asm/unaligned.h | 29 ---
block/partitions/ldm.h | 2 +-
block/partitions/msdos.c | 2 +-
drivers/net/wireless/marvell/mwifiex/pcie.c | 10 +-
include/asm-generic/unaligned.h | 149 ++++++++++++---
include/linux/unaligned/access_ok.h | 68 -------
include/linux/unaligned/be_byteshift.h | 71 -------
include/linux/unaligned/be_memmove.h | 37 ----
include/linux/unaligned/be_struct.h | 37 ----
include/linux/unaligned/generic.h | 115 -----------
include/linux/unaligned/le_byteshift.h | 71 -------
include/linux/unaligned/le_memmove.h | 37 ----
include/linux/unaligned/le_struct.h | 37 ----
include/linux/unaligned/memmove.h | 46 -----
net/core/netpoll.c | 4 +-
security/apparmor/policy_unpack.c | 2 +-
30 files changed, 137 insertions(+), 1000 deletions(-)
delete mode 100644 arch/alpha/include/asm/unaligned.h
delete mode 100644 arch/arm/include/asm/unaligned.h
delete mode 100644 arch/ia64/include/asm/unaligned.h
delete mode 100644 arch/m68k/include/asm/unaligned.h
delete mode 100644 arch/microblaze/include/asm/unaligned.h
delete mode 100644 arch/openrisc/include/asm/unaligned.h
delete mode 100644 arch/powerpc/include/asm/unaligned.h
delete mode 100644 arch/sh/include/asm/unaligned-sh4a.h
delete mode 100644 arch/sh/include/asm/unaligned.h
delete mode 100644 arch/sparc/include/asm/unaligned.h
delete mode 100644 arch/x86/include/asm/unaligned.h
delete mode 100644 arch/xtensa/include/asm/unaligned.h
delete mode 100644 include/linux/unaligned/access_ok.h
delete mode 100644 include/linux/unaligned/be_byteshift.h
delete mode 100644 include/linux/unaligned/be_memmove.h
delete mode 100644 include/linux/unaligned/be_struct.h
delete mode 100644 include/linux/unaligned/generic.h
delete mode 100644 include/linux/unaligned/le_byteshift.h
delete mode 100644 include/linux/unaligned/le_memmove.h
delete mode 100644 include/linux/unaligned/le_struct.h
delete mode 100644 include/linux/unaligned/memmove.h
Cc: Amitkumar Karwar <amitkarwar@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Ganapathi Bhat <ganapathi017@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: James Morris <jmorris@namei.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: John Johansen <john.johansen@canonical.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Rich Felker <dalias@libc.org>
Cc: "Richard Russon (FlatCap)" <ldm@flatcap.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Cc: Sharvari Harisangam <sharvari.harisangam@nxp.com>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vladimir Oltean <vladimir.oltean@nxp.com>
Cc: Xinming Hu <huxinming820@gmail.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: x86@kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-m68k@lists.linux-m68k.org
Cc: linux-crypto@vger.kernel.org
Cc: openrisc@lists.librecores.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-sh@vger.kernel.org
Cc: sparclinux@vger.kernel.org
Cc: linux-ntfs-dev@lists.sourceforge.net
Cc: linux-block@vger.kernel.org
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-security-module@vger.kernel.org
--
2.29.2
^ permalink raw reply [flat|nested] 50+ messages in thread