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Message-Id: <20080703155302.5f86d8f4.akpm@linux-foundation.org> Date: Thu, 3 Jul 2008 15:53:02 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Steven Rostedt <rostedt@...dmis.org> Cc: linux-kernel@...r.kernel.org, tglx@...utronix.de, torvalds@...ux-foundation.org, akpm@...uxfoundation.org, peterz@...radead.org, stable@...nel.org Subject: Re: [PATCH] hrtimer: prevent migration for raising softirq On Thu, 3 Jul 2008 14:31:26 -0400 (EDT) Steven Rostedt <rostedt@...dmis.org> wrote: > Due to a possible deadlock, the waking of the softirq was pushed outside > of the hrtimer base locks. See commit 0c96c5979a522c3323c30a078a70120e29b5bdbc Please quote at least the patch title rather than raw hashes. afaict that patch isn't in 2.6.25 yet you copied stable@...nel.org. Please clarify. > > Unfortunately this allows the task to migrate after setting up the softirq > and raising it. Since softirqs run a queue that is per-cpu we may raise the > softirq on the wrong CPU and this will keep the queued softirq task from > running. > > To solve this issue, this patch disables preemption around the releasing > of the hrtimer lock and raising of the softirq. > This seems to be 2.6.26 material and is inapplicable to 2.6.25? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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