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| author | David S. Miller <davem@davemloft.net> | 2008-07-27 16:51:21 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-07-27 16:51:21 -0700 |
| commit | 281c7413ed914623d3245299a4761b6b27ab9fdb (patch) | |
| tree | 182b5222a7ad4b77c32f7845ea777ca665d7def2 /include/asm-arm/bitops.h | |
| parent | 2ab61b01110aa04cd853c619a74881e3225a5e24 (diff) | |
| parent | c9272c4f9fbe2087beb3392f526dc5b19efaa56b (diff) | |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'include/asm-arm/bitops.h')
| -rw-r--r-- | include/asm-arm/bitops.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/include/asm-arm/bitops.h b/include/asm-arm/bitops.h index 5c60bfc1a84..9a1db20e032 100644 --- a/include/asm-arm/bitops.h +++ b/include/asm-arm/bitops.h @@ -277,9 +277,16 @@ static inline int constant_fls(int x) * the clz instruction for much better code efficiency. */ -#define fls(x) \ +#define __fls(x) \ ( __builtin_constant_p(x) ? constant_fls(x) : \ ({ int __r; asm("clz\t%0, %1" : "=r"(__r) : "r"(x) : "cc"); 32-__r; }) ) + +/* Implement fls() in C so that 64-bit args are suitably truncated */ +static inline int fls(int x) +{ + return __fls(x); +} + #define ffs(x) ({ unsigned long __t = (x); fls(__t & -__t); }) #define __ffs(x) (ffs(x) - 1) #define ffz(x) __ffs( ~(x) ) |