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Date: Thu, 27 Feb 2014 09:20:55 -0500 From: Sasha Levin <sasha.levin@...cle.com> To: lizefan@...wei.com Cc: linux-kernel@...r.kernel.org, Sasha Levin <sasha.levin@...cle.com> Subject: [PATCH] cpuset: Add missing rcu read locks We call task_cs() which ends up going into cgroup code without having rcu read lock. Fix it by grabbing the lock before retrival of task_cs() and usage of the result. Signed-off-by: Sasha Levin <sasha.levin@...cle.com> --- kernel/cpuset.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/kernel/cpuset.c b/kernel/cpuset.c index be9c1da..64bd8a4 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -2240,8 +2240,10 @@ void cpuset_cpus_allowed(struct task_struct *tsk, struct cpumask *pmask) mutex_lock(&callback_mutex); task_lock(tsk); + rcu_read_lock(); cpus_cs = effective_cpumask_cpuset(task_cs(tsk)); guarantee_online_cpus(cpus_cs, pmask); + rcu_read_unlock(); task_unlock(tsk); mutex_unlock(&callback_mutex); } @@ -2296,8 +2298,10 @@ nodemask_t cpuset_mems_allowed(struct task_struct *tsk) mutex_lock(&callback_mutex); task_lock(tsk); + rcu_read_lock(); mems_cs = effective_nodemask_cpuset(task_cs(tsk)); guarantee_online_mems(mems_cs, &mask); + rcu_read_unlock(); task_unlock(tsk); mutex_unlock(&callback_mutex); -- 1.7.2.5 -- 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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