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* [RFC 0/12] Unify asm/unaligned.h around struct helper
@ 2021-05-07 22:07 Arnd Bergmann
  2021-05-07 22:07 ` [RFC 03/12] sh: remove unaligned access for sh4a Arnd Bergmann
  2021-05-07 22:07 ` [RFC 0/12] Unify asm/unaligned.h around struct helper Arnd Bergmann
  0 siblings, 2 replies; 4+ 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] 4+ messages in thread

* [RFC 03/12] sh: remove unaligned access for sh4a
  2021-05-07 22:07 [RFC 0/12] Unify asm/unaligned.h around struct helper Arnd Bergmann
@ 2021-05-07 22:07 ` Arnd Bergmann
  2021-05-10 21:11   ` Rob Landley
  2021-05-07 22:07 ` [RFC 0/12] Unify asm/unaligned.h around struct helper Arnd Bergmann
  1 sibling, 1 reply; 4+ 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	[flat|nested] 4+ 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 03/12] sh: remove unaligned access for sh4a Arnd Bergmann
@ 2021-05-07 22:07 ` Arnd Bergmann
  1 sibling, 0 replies; 4+ 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] 4+ 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; 4+ 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] 4+ messages in thread

end of thread, other threads:[~2021-05-10 20:55 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-05-07 22:07 [RFC 0/12] Unify asm/unaligned.h around struct helper Arnd Bergmann
2021-05-07 22:07 ` [RFC 03/12] sh: remove unaligned access for sh4a Arnd Bergmann
2021-05-10 21:11   ` Rob Landley
2021-05-07 22:07 ` [RFC 0/12] Unify asm/unaligned.h around struct helper Arnd Bergmann

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