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Subject: Re: [PATCH] memcg: remove unneeded preempt_disable
From: Peter Zijlstra <peterz@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Thelen <gthelen@google.com>, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
        Balbir Singh <bsingharora@gmail.com>,
        Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>,
        linux-arch@vger.kernel.org
Date: Thu, 25 Aug 2011 16:57:52 +0200
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On Thu, 2011-08-18 at 14:40 -0700, Andrew Morton wrote:
> 
> I think I'll apply it, as the call frequency is low (correct?) and the
> problem will correct itself as other architectures implement their
> atomic this_cpu_foo() operations. 

Which leads me to wonder, can anything but x86 implement that this_cpu_*
muck? I doubt any of the risk chips can actually do all this.
Maybe Itanic, but then that seems to be dying fast.