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m68k: Add ext2_find_{first,next}_bit() for ext4 

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

[akpm@linux-foundation.org: coding-style fixes]
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>
This commit is contained in:
Aneesh Kumar K.V 2008-06-12 15:21:29 -07:00 committed by Linus Torvalds
parent 2d518f84e5
commit 69c5ddf58a
1 changed files with 43 additions and 2 deletions
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45
include/asm-m68k/bitops.h
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@ -410,8 +410,49 @@ 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__ */