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x86: fix new find_first_bit()

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Some edge problems with the original C rewrite.

Thanks go to Cal Peake, who pinpointed the breakage to the rewrite, and
tested this fixed version.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Linus Torvalds 2005-07-29 11:01:22 -04:00
parent 33ac02aa4c
commit d6d2a2ab05
1 changed files with 6 additions and 7 deletions
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13
include/asm-i386/bitops.h
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@ -335,14 +335,13 @@ static inline unsigned long __ffs(unsigned long word)
static inline int find_first_bit(const unsigned long *addr, unsigned size) static inline int find_first_bit(const unsigned long *addr, unsigned size)
{ {
int x = 0; int x = 0;
do {
if (*addr) while (x < size) {
return __ffs(*addr) + x; unsigned long val = *addr++;
addr++; if (val)
if (x >= size) return __ffs(val) + x;
break;
x += (sizeof(*addr)<<3); x += (sizeof(*addr)<<3);
} while (1); }
return x; return x;
} }