linux-kernel - Re: [BUG] "sched: Remove rq->lock from the first half of ttwu()" locks up on ARM

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Message-ID: <20110529102659.GY24876@n2100.arm.linux.org.uk>
Date:	Sun, 29 May 2011 11:26:59 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Frank Rowand <frank.rowand@...sony.com>,
	Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org,
	Yong Zhang <yong.zhang0@...il.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [BUG] "sched: Remove rq->lock from the first half of ttwu()"
	locks up on ARM

On Sun, May 29, 2011 at 11:21:19AM +0100, Catalin Marinas wrote:
> To avoid extra per-thread flags, we could set a per-cpu variable in
> switch_mm() so that we know what to switch the page tables to in the
> post-switch hook.

Why do we need to add more per-cpu stuff when we already have easy access
to the thread flags?
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