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

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>

diff --git a/include/asm-generic/unaligned.h b/include/asm-generic/unaligned.h
index 6c90f0f..4dc8ddb 100644 (file)
--- a/include/asm-generic/unaligned.h
+++ b/include/asm-generic/unaligned.h
@@ -16,9 +16,9 @@
  * The main single-value unaligned transfer routines.
  */
 #define get_unaligned(ptr) \
-       ((__typeof__(*(ptr)))__get_unaligned((ptr), sizeof(*(ptr))))
+       __get_unaligned((ptr), sizeof(*(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
@@ -36,19 +36,19 @@ struct __una_u16 { __u16 x __attribute__((packed)); };
  * 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;
        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;
        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;
        return ptr->x;
@@ -78,7 +78,7 @@ static inline void __ustw(__u16 val, __u16 *addr)
 
 #define __get_unaligned(ptr, size) ({          \
        const void *__gu_p = ptr;               \
-       unsigned long val;                      \
+       __typeof__(*(ptr)) val;                 \
        switch (size) {                         \
        case 1:                                 \
                val = *(const __u8 *)__gu_p;    \