Re: [PATCH] hrtimer: prevent migration for raising softirq

[Andrew Morton]

On Thu, 3 Jul 2008 14:31:26 -0400 (EDT)
Steven Rostedt <rostedt@xxxxxxxxxxx> 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@xxxxxxxxxxx 
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?
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