linux-kernel - Re: [PATCH -v4 1/2] lib, Make gen

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Message-ID: <1289994796.2109.722.camel@laptop>
Date:	Wed, 17 Nov 2010 12:53:16 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	huang ying <huang.ying.caritas@...il.com>
Cc:	Huang Ying <ying.huang@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Len Brown <lenb@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Mauro Carvalho Chehab <mchehab@...hat.com>
Subject: Re: [PATCH -v4 1/2] lib, Make gen_pool memory allocator lockless

On Wed, 2010-11-17 at 19:47 +0800, huang ying wrote:
> On Wed, Nov 17, 2010 at 6:40 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> > On Wed, 2010-11-17 at 10:18 +0800, Huang Ying wrote:
> >>
> >> cmpxchg has been used in that way by ftrace and perf for a long time. So
> >> I agree to make it a requirement on future architecture ports.
> >
> > Neither mandate an architecture do this though, only that when an
> > architecture wants to support either feature and has NMIs (not all archs
> > have NMI equivalents) it has to be safe.
> 
> So we can make sure cmpxchg can be used in lock-less code on
> architectures with perf, irq_work or ftrace enabled?

It had better, otherwise stuff is broken.
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