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[PATCH] optimise 64bit unaligned access on 32bit kernel

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I've rewriten Atushi's fix for the 64-bit put_unaligned on 32-bit systems
bug to generate more efficient code.

This case has buzilla URL http://bugzilla.kernel.org/show_bug.cgi?id=5138.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ralf Baechle 2005-09-06 15:17:51 -07:00 • committed by Linus Torvalds
parent 82a25b5670
commit eed74dfcd4
1 changed files with 6 additions and 6 deletions
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12
include/asm-generic/unaligned.h
View file

@ -16,9 +16,9 @@
* The main single-value unaligned transfer routines. * The main single-value unaligned transfer routines.
*/ */
#define get_unaligned(ptr) \ #define get_unaligned(ptr) \
((__typeof__(*(ptr)))__get_unaligned((ptr), sizeof(*(ptr)))) __get_unaligned((ptr), sizeof(*(ptr)))
#define put_unaligned(x,ptr) \ #define put_unaligned(x,ptr) \
__put_unaligned((unsigned long)(x), (ptr), sizeof(*(ptr))) __put_unaligned((__u64)(x), (ptr), sizeof(*(ptr)))
/* /*
* This function doesn't actually exist. The idea is that when * This function doesn't actually exist. The idea is that when
@ -36,19 +36,19 @@ struct __una_u16 { __u16 x __attribute__((packed)); };
* Elemental unaligned loads * Elemental unaligned loads
*/ */
static inline unsigned long __uldq(const __u64 *addr) static inline __u64 __uldq(const __u64 *addr)
{ {
const struct __una_u64 *ptr = (const struct __una_u64 *) addr; const struct __una_u64 *ptr = (const struct __una_u64 *) addr;
return ptr->x; return ptr->x;
} }
static inline unsigned long __uldl(const __u32 *addr) static inline __u32 __uldl(const __u32 *addr)
{ {
const struct __una_u32 *ptr = (const struct __una_u32 *) addr; const struct __una_u32 *ptr = (const struct __una_u32 *) addr;
return ptr->x; return ptr->x;
} }
static inline unsigned long __uldw(const __u16 *addr) static inline __u16 __uldw(const __u16 *addr)
{ {
const struct __una_u16 *ptr = (const struct __una_u16 *) addr; const struct __una_u16 *ptr = (const struct __una_u16 *) addr;
return ptr->x; return ptr->x;
@ -78,7 +78,7 @@ static inline void __ustw(__u16 val, __u16 *addr)
#define __get_unaligned(ptr, size) ({ \ #define __get_unaligned(ptr, size) ({ \
const void *__gu_p = ptr; \ const void *__gu_p = ptr; \
unsigned long val; \ __typeof__(*(ptr)) val; \
switch (size) { \ switch (size) { \
case 1: \ case 1: \
val = *(const __u8 *)__gu_p; \ val = *(const __u8 *)__gu_p; \