Date: Wed, 14 Jul 2010 13:08:05 -0400
From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>, Ingo Molnar <mingo@elte.hu>,
        Peter Zijlstra <peterz@infradead.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Steven Rostedt <rostedt@rostedt.homelinux.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Thomas Gleixner <tglx@linutronix.de>, Christoph Hellwig <hch@lst.de>,
        Li Zefan <lizf@cn.fujitsu.com>, Lai Jiangshan <laijs@cn.fujitsu.com>,
        Johannes Berg <johannes.berg@intel.com>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Arnaldo Carvalho de Melo <acme@infradead.org>,
        Tom Zanussi <tzanussi@gmail.com>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Tejun Heo <htejun@gmail.com>
Subject: Re: [patch 0/2] x86: NMI-safe trap handlers
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References: <20100714154923.947138065@efficios.com> <20100714170606.GA22373@basil.fritz.box>
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* Andi Kleen (andi@firstfloor.org) wrote:
> > x86_32 cannot use vmalloc_sync_all() to sychronize the TLBs from every
> > processes because the vmalloc area is mapped in a different address space for
> 
> That doesn't make sense. vmalloc_all_sync() should work on 32bit too.
> It just needs to walk all processes and fix up every page table.

Yeah, I've been taken aback when Tejun told me that a few moments ago. I
initially thought that vmalloc_sync_all() synchronized all page mappings of all
processes on x86_32. But apparently that does not seem to be the case. I'm
adding him in CC.

Thanks,

Mathieu

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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