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sh: cmpxchg: fix a bit shift bug in big_endian os

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Correct bitoff in big endian OS.
Current code works correctly for 1 byte but not for 2 bytes.

Fixes: 3226aad81a ("sh: support 1 and 2 byte xchg")
Signed-off-by: Pan Xinhui <[email protected]>
Acked-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Rich Felker <[email protected]>
This commit is contained in:
Pan Xinhui 2016-04-20 14:41:00 +08:00 • committed by Rich Felker
commit ff18143cee
1 changed files with 1 additions and 1 deletions
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arch/sh/include/asm/cmpxchg-xchg.h
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@ -21,7 +21,7 @@ static inline u32 __xchg_cmpxchg(volatile void *ptr, u32 x, int size)
int off = (unsigned long)ptr % sizeof(u32);
volatile u32 *p = ptr - off;
#ifdef __BIG_ENDIAN
int bitoff = (sizeof(u32) - 1 - off) * BITS_PER_BYTE;
int bitoff = (sizeof(u32) - size - off) * BITS_PER_BYTE;
#else
int bitoff = off * BITS_PER_BYTE;
#endif