* [RFC 0/12] Unify asm/unaligned.h around struct helper
@ 2021-05-07 22:07 Arnd Bergmann
2021-05-07 22:07 ` [RFC 08/12] partitions: msdos: fix one-byte get_unaligned() Arnd Bergmann
2021-05-07 22:07 ` [RFC 0/12] Unify asm/unaligned.h around struct helper Arnd Bergmann
0 siblings, 2 replies; 3+ 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] 3+ messages in thread
* [RFC 08/12] partitions: msdos: fix one-byte get_unaligned()
2021-05-07 22:07 [RFC 0/12] Unify asm/unaligned.h around struct helper Arnd Bergmann
@ 2021-05-07 22:07 ` Arnd Bergmann
2021-05-07 22:07 ` [RFC 0/12] Unify asm/unaligned.h around struct helper Arnd Bergmann
1 sibling, 0 replies; 3+ 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] 3+ messages in thread
* [RFC 0/12] Unify asm/unaligned.h around struct helper
2021-05-07 22:07 [RFC 0/12] Unify asm/unaligned.h around struct helper Arnd Bergmann
2021-05-07 22:07 ` [RFC 08/12] partitions: msdos: fix one-byte get_unaligned() Arnd Bergmann
@ 2021-05-07 22:07 ` Arnd Bergmann
1 sibling, 0 replies; 3+ 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] 3+ messages in thread
end of thread, other threads:[~2021-05-07 22:12 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2021-05-07 22:07 [RFC 0/12] Unify asm/unaligned.h around struct helper Arnd Bergmann
2021-05-07 22:07 ` [RFC 08/12] partitions: msdos: fix one-byte get_unaligned() Arnd Bergmann
2021-05-07 22:07 ` [RFC 0/12] Unify asm/unaligned.h around struct helper Arnd Bergmann
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