diff options
| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2008-06-08 22:30:48 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-06-16 13:20:03 -0700 |
| commit | c547cbac3ae2fe6689e764ba45f99b5733e506a9 (patch) | |
| tree | 682229e9aeaef39711bb49ff82ad0c7d7f41b35b /include | |
| parent | bc5f3280dfe06b606f49a0eee13fede2cc7f5635 (diff) | |
m68k: Add ext2_find_{first,next}_bit() for ext4
commit 69c5ddf58a03da3686691ad2f293bc79fd977c10 upstream
Add ext2_find_{first,next}_bit(), which are needed for ext4.
They're derived out of the ext2_find_next_zero_bit found in the same file.
Compile tested with crosstools
[Reworked to preserve all symmetry with ext2_find_{first,next}_zero_bit()]
This fixes http://bugzilla.kernel.org/show_bug.cgi?id=10393
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-m68k/bitops.h | 46 |
1 files changed, 44 insertions, 2 deletions
diff --git a/include/asm-m68k/bitops.h b/include/asm-m68k/bitops.h index 83d1f286230..fbb7f067487 100644 --- a/include/asm-m68k/bitops.h +++ b/include/asm-m68k/bitops.h @@ -410,8 +410,50 @@ static inline int ext2_find_next_zero_bit(const void *vaddr, unsigned size, res = ext2_find_first_zero_bit (p, size - 32 * (p - addr)); return (p - addr) * 32 + res; } -#define ext2_find_next_bit(addr, size, off) \ - generic_find_next_le_bit((unsigned long *)(addr), (size), (off)) + +static inline int ext2_find_first_bit(const void *vaddr, unsigned size) +{ + const unsigned long *p = vaddr, *addr = vaddr; + int res; + + if (!size) + return 0; + + size = (size >> 5) + ((size & 31) > 0); + while (*p++ == 0UL) + { + if (--size == 0) + return (p - addr) << 5; + } + + --p; + for (res = 0; res < 32; res++) + if (ext2_test_bit(res, p)) + break; + return (p - addr) * 32 + res; +} + +static inline int ext2_find_next_bit(const void *vaddr, unsigned size, + unsigned offset) +{ + const unsigned long *addr = vaddr; + const unsigned long *p = addr + (offset >> 5); + int bit = offset & 31UL, res; + + if (offset >= size) + return size; + + if (bit) { + /* Look for one in first longword */ + for (res = bit; res < 32; res++) + if (ext2_test_bit(res, p)) + return (p - addr) * 32 + res; + p++; + } + /* No set bit yet, search remaining full bytes for a set bit */ + res = ext2_find_first_bit(p, size - 32 * (p - addr)); + return (p - addr) * 32 + res; +} #endif /* __KERNEL__ */ |