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SubjectRe: [bisected] kernel panic 2.6.22 -> 2.6.26-rc9+
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Andrew Morton <akpm@linux-foundation.org> writes:

> --- a/include/asm-arm/bitops.h~a
> +++ a/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);
> +}
> +

Well, I like it more as it fixes all possible places instead of only
fls64().

But... can't we just move the #define body into the inline fls(x)?
Will there be other users of __fls(x)? It seems the
__builtin_constant_p(x) works for inline functions.

The above patch fixes the kernel panic, too.
--
Krzysztof Halasa


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