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

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Message-ID: <20110526122623.GA11875@elte.hu>
Date:	Thu, 26 May 2011 14:26:23 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Marc Zyngier <Marc.Zyngier@....com>,
	Yong Zhang <yong.zhang0@...il.com>,
	Frank Rowand <frank.rowand@...sony.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: [BUG] "sched: Remove rq->lock from the first half of ttwu()"
 locks up on ARM


* Peter Zijlstra <peterz@...radead.org> wrote:

> Sort this by reverting to the old behaviour for this situation and 
> perform a full remote wake-up.

Btw., ARM should consider switching most of its subarchitectures to 
!__ARCH_WANT_INTERRUPTS_ON_CTXSW - enabling irqs during context 
switches is silly and now expensive as well.

Thanks,

	Ingo
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