linux-kernel - Re: [COUNTERPATCH] mm: avoid overflowing preempt_count() in mmu_take_all

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Message-ID: <1270120592.1653.192.camel@laptop>
Date:	Thu, 01 Apr 2010 13:16:32 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Avi Kivity <avi@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	aarcange@...hat.com, akpm@...ux-foundation.org,
	Kent Overstreet <kent.overstreet@...il.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [COUNTERPATCH] mm: avoid overflowing preempt_count() in
 mmu_take_all_locks()

On Thu, 2010-04-01 at 14:13 +0300, Avi Kivity wrote:

> If someone is willing to audit all code paths to make sure these locks 
> are always taken in schedulable context I agree that's a better fix.

They had better be, they're not irq-safe. Also that's what lockdep is
for.


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