Re: [PATCH 29/31] arch,xtensa: Convert smp_mb__*

[Max Filippov]

Hi Peter,

On Wed, Mar 19, 2014 at 10:47 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> Xtensa SMP has ll/sc which is fully serializing, therefore its exising

One minor correction: current xtensa ISA doens't have ll/sc, it only
has cas (s32c1i instruction), which is fully serializing.

> smp_mb__{before,after}_clear_bit() appear unduly heavy.
>
> Implement the new barriers are barrier().
>
> Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> ---
>  arch/xtensa/include/asm/atomic.h  |    7 +------
>  arch/xtensa/include/asm/barrier.h |    3 +++
>  arch/xtensa/include/asm/bitops.h  |    4 +---
>  3 files changed, 5 insertions(+), 9 deletions(-)

-- 
Thanks.
-- Max
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