linux-kernel - Re: [PATCH 29/31] arch,xtensa: Convert smp_mb_

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Message-ID: <CAMo8BfLLFqYz96LLJy0f+9XgAdQVUVhRg_VGp+yG92Gfk=sfaQ@mail.gmail.com>
Date:	Wed, 19 Mar 2014 17:11:34 +0400
From:	Max Filippov <jcmvbkbc@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Linux-Arch <linux-arch@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>, will.deacon@....com,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH 29/31] arch,xtensa: Convert smp_mb__*

Hi Peter,

On Wed, Mar 19, 2014 at 10:47 AM, Peter Zijlstra <peterz@...radead.org> 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@...radead.org>
> ---
>  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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