From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 9 Dec 2009 10:15:01 +0000 (+0000)
Subject: sched: Use rcu in sched_get/set_affinity()
X-Git-Tag: v2.6.33-rc2~48^2~22
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=23f5d142519621b16cf2b378cf8adf4dcf01a616;p=pandora-kernel.git

sched: Use rcu in sched_get/set_affinity()

tasklist_lock is held read locked to protect the
find_task_by_vpid() call and to prevent the task going away.
sched_setaffinity acquires a task struct ref and drops tasklist
lock right away. The access to the cpus_allowed mask is
protected by rq->lock.

rcu_read_lock() provides the same protection here.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <20091209100706.789059966@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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