Commit c0fd2000 authored by Pan Xinhui's avatar Pan Xinhui Committed by Greg Kroah-Hartman

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

commit ff18143c upstream.

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

Fixes: 3226aad8 ("sh: support 1 and 2 byte xchg")
Signed-off-by: default avatarPan Xinhui <xinhui.pan@linux.vnet.ibm.com>
Acked-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: default avatarRich Felker <dalias@libc.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b93b47fd
......@@ -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
......
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