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

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Message-ID: <1289990458.2109.675.camel@laptop>
Date:	Wed, 17 Nov 2010 11:40:58 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Huang Ying <ying.huang@...el.com>
Cc:	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 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.




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