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

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Message-ID: <20140319133030.GA7744@laptop.programming.kicks-ass.net>
Date:	Wed, 19 Mar 2014 14:30:30 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Max Filippov <jcmvbkbc@...il.com>
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__*

On Wed, Mar 19, 2014 at 05:11:34PM +0400, Max Filippov wrote:
> 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.

Oh; my bad in reading your asm. The l32i and s32cli read like a load 32
and store 32 conditional to me. But sure, cas works too :-)

I'll ammend the changelog. Thanks!
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