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| author | Eric Sandeen <sandeen@redhat.com> | 2008-08-21 19:46:37 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-08-21 19:46:41 +0200 |
| commit | 152382af4056aadc0c2ea2e8e8258b277be085bf (patch) | |
| tree | 05cd2d88b4c1a919b1094f45d426aca808dd5894 /arch/s390 | |
| parent | 16f7f9564c3ae190954f2ec55f385a268b93ac4d (diff) | |
| download | op-kernel-dev-152382af4056aadc0c2ea2e8e8258b277be085bf.zip op-kernel-dev-152382af4056aadc0c2ea2e8e8258b277be085bf.tar.gz | |
[S390] fix ext2_find_next_bit
ext4 does not work on s390 because ext2_find_next_bit is broken. Fortunately
this function is only used by ext4. The function uses ffs which does not work
analog to ffz. The result of ffs has an offset of 1 which is not taken into
account. To fix this use the low level __ffs_word function directly instead
of the ill defined ffs.
In addition the patch improves find_next_zero_bit and ext2_find_next_zero_bit
by passing the bit offset into __ffz_word instead of adding it after the
function call returned.
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/bitops.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/s390/include/asm/bitops.h b/arch/s390/include/asm/bitops.h index b4eb24a..8e9243a 100644 --- a/arch/s390/include/asm/bitops.h +++ b/arch/s390/include/asm/bitops.h @@ -709,7 +709,7 @@ static inline int find_next_zero_bit (const unsigned long * addr, * __ffz_word returns __BITOPS_WORDSIZE * if no zero bit is present in the word. */ - set = __ffz_word(0, *p >> bit) + bit; + set = __ffz_word(bit, *p >> bit); if (set >= size) return size + offset; if (set < __BITOPS_WORDSIZE) @@ -824,7 +824,7 @@ static inline int ext2_find_next_zero_bit(void *vaddr, unsigned long size, * s390 version of ffz returns __BITOPS_WORDSIZE * if no zero bit is present in the word. */ - set = ffz(__load_ulong_le(p, 0) >> bit) + bit; + set = __ffz_word(bit, __load_ulong_le(p, 0) >> bit); if (set >= size) return size + offset; if (set < __BITOPS_WORDSIZE) @@ -865,7 +865,7 @@ static inline int ext2_find_next_bit(void *vaddr, unsigned long size, * s390 version of ffz returns __BITOPS_WORDSIZE * if no zero bit is present in the word. */ - set = ffs(__load_ulong_le(p, 0) >> bit) + bit; + set = __ffs_word(0, __load_ulong_le(p, 0) & (~0UL << bit)); if (set >= size) return size + offset; if (set < __BITOPS_WORDSIZE) |
