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authorPan Xinhui <xinhui.pan@linux.vnet.ibm.com>2016-04-20 14:41:00 +0800
committerRich Felker <dalias@libc.org>2016-07-15 03:44:15 +0000
commit3a11bad30160e9e42cd8e2cf7e801eda2e83c9cf (patch)
treeddbf96b0bb789b0e64da6219382d8a44910318bd
parent92d21ac74a9e3c09b0b01c764e530657e4c85c49 (diff)
downloadlinux-sh-3a11bad30160e9e42cd8e2cf7e801eda2e83c9cf.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