linux-kernel - Re: [patch 0/2] x86: NMI-safe trap handlers

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Message-ID: <20100714170606.GA22373@basil.fritz.box>
Date:	Wed, 14 Jul 2010 19:06:06 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Steven Rostedt <rostedt@...tedt.homelinux.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Christoph Hellwig <hch@....de>, Li Zefan <lizf@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Johannes Berg <johannes.berg@...el.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Tom Zanussi <tzanussi@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [patch 0/2] x86: NMI-safe trap handlers

> 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.

-Andi
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