From: Rusty Russell <rusty@rustcorp.com.au>
Date: Mon, 24 Nov 2008 16:05:11 +0000 (+1030)
Subject: sched: avoid stack var in move_task_off_dead_cpu
X-Git-Tag: v2.6.29-rc1~538^2~42
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e76bd8d9850c2296a7e8e24c9dce9b5e6b55fe2f;p=pandora-kernel.git

sched: avoid stack var in move_task_off_dead_cpu

Impact: stack usage reduction

With some care, we can avoid needing a temporary cpumask (we can't
really allocate here, since we can't fail).

This version calls cpuset_cpus_allowed_locked() with the task_rq_lock
held.  I'm fairly sure this works, but there might be a deadlock
hiding.

And of course, we can't get rid of the last cpumask on stack until we
can use cpumask_of_node instead of node_to_cpumask.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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