linux-kernel - Re: [PATCH] fix pgd

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Message-ID: <4D5BFAB7.5070504@redhat.com>
Date:	Wed, 16 Feb 2011 11:26:31 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
CC:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	"Xen-devel@...ts.xensource.com" <Xen-devel@...ts.xensource.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	Jan Beulich <JBeulich@...ell.com>,
	Larry Woodman <lwoodman@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>, Johannes Weiner <jweiner@...hat.com>,
	Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH] fix pgd_lock deadlock

On 02/16/2011 09:49 AM, Andrea Arcangeli wrote:

> Subject: fix pgd_lock deadlock
>
> From: Andrea Arcangeli<aarcange@...hat.com>
>
> It's forbidden to take the page_table_lock with the irq disabled or if there's
> contention the IPIs (for tlb flushes) sent with the page_table_lock held will
> never run leading to a deadlock.
>
> Apparently nobody takes the pgd_lock from irq so the _irqsave can be removed.
>
> Signed-off-by: Andrea Arcangeli<aarcange@...hat.com>


Acked-by: Rik van Riel <riel@...hat.com>
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