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authorPan Xinhui <xinhui.pan@linux.vnet.ibm.com>2016-04-20 14:41:00 +0800
committerRich Felker <dalias@libc.org>2016-06-08 21:44:01 +0000
commit6966fd252f17b1f3e970400b572cfc57bbdd9ffe (patch)
tree0b1d212f65fccc11b8344d475f4c50869b5bbe3b
parent122126c5387b8dd403423e6c4d5af7583a1f05bf (diff)
downloadlinux-sh-6966fd252f17b1f3e970400b572cfc57bbdd9ffe.tar.gz
sh: cmpxchg: fix a bit shift bug in big_endian os
Correct bitoff in big endian OS. Current code works correctly for 1 byte but not for 2 bytes. Fixes: 3226aad81aa6 ("sh: support 1 and 2 byte xchg") Signed-off-by: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Rich Felker <dalias@libc.org>
-rw-r--r--arch/sh/include/asm/cmpxchg-xchg.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/sh/include/asm/cmpxchg-xchg.h b/arch/sh/include/asm/cmpxchg-xchg.h
index 7219719c23a3..1e881f5db659 100644
--- a/arch/sh/include/asm/cmpxchg-xchg.h
+++ b/arch/sh/include/asm/cmpxchg-xchg.h
@@ -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