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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2013-07-25 10:18:17 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-08-11 18:35:25 -0700
commitfa2446744dd5a99a3938aad9faade9b8928aec48 (patch)
treeed56acf132f5d54553e2e4383c929f341addbb5b /arch/s390
parent72e2729ea923cbbbeda03e5fce14f50b0707f724 (diff)
s390/bitops: fix find_next_bit_left
commit 3b0040a47ad63f7147e9e7d2febb61a3b564bb90 upstream. The find_next_bit_left function is broken if used with an offset which is not a multiple of 64. The shift to mask the bits of a 64-bit word not to search is in the wrong direction, the result can be either a bit found smaller than the offset or failure to find a set bit. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/include/asm/bitops.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/include/asm/bitops.h b/arch/s390/include/asm/bitops.h
index 4d8604e311f3..7d4676758733 100644
--- a/arch/s390/include/asm/bitops.h
+++ b/arch/s390/include/asm/bitops.h
@@ -693,7 +693,7 @@ static inline int find_next_bit_left(const unsigned long *addr,
size -= offset;
p = addr + offset / BITS_PER_LONG;
if (bit) {
- set = __flo_word(0, *p & (~0UL << bit));
+ set = __flo_word(0, *p & (~0UL >> bit));
if (set >= size)
return size + offset;
if (set < BITS_PER_LONG)