Re: [PATCH] powerpc/bitops: Fix possible undefined behaviour with fls() and fls64()

[Michael Ellerman]

On Thu, 22 Oct 2020 14:05:46 +0000 (UTC), Christophe Leroy wrote:
> fls() and fls64() are using __builtin_ctz() and _builtin_ctzll().
> On powerpc, those builtins trivially use ctlzw and ctlzd power
> instructions.
> 
> Allthough those instructions provide the expected result with
> input argument 0, __builtin_ctz() and __builtin_ctzll() are
> documented as undefined for value 0.
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/bitops: Fix possible undefined behaviour with fls() and fls64()
      https://git.kernel.org/powerpc/c/1891ef21d92c4801ea082ee8ed478e304ddc6749

cheers