[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <1303384044-7646-1-git-send-email-dfeng@redhat.com>
Date: Thu, 21 Apr 2011 19:07:24 +0800
From: Xiaotian Feng <dfeng@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: Xiaotian Feng <dfeng@...hat.com>, Ingo Molnar <mingo@...e.hu>,
Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH -tip] sched: more sched_domain iterations fix
sched_domain iterations needs to be protected by rcu_read_lock() now,
this patch adds another two places which needs the rcu lock.
Signed-off-by: Xiaotian Feng <dfeng@...hat.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Peter Zijlstra <peterz@...radead.org>
---
kernel/sched_rt.c | 2 ++
kernel/sched_stats.h | 2 ++
2 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 19ecb31..901ed2a 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -1282,7 +1282,9 @@ static struct rq *find_lock_lowest_rq(struct task_struct *task, struct rq *rq)
int cpu;
for (tries = 0; tries < RT_MAX_TRIES; tries++) {
+ rcu_read_lock();
cpu = find_lowest_rq(task);
+ rcu_read_unlock();
if ((cpu == -1) || (cpu == rq->cpu))
break;
diff --git a/kernel/sched_stats.h b/kernel/sched_stats.h
index 48ddf43..d25c8c1 100644
--- a/kernel/sched_stats.h
+++ b/kernel/sched_stats.h
@@ -38,6 +38,7 @@ static int show_schedstat(struct seq_file *seq, void *v)
#ifdef CONFIG_SMP
/* domain-specific stats */
preempt_disable();
+ rcu_read_lock();
for_each_domain(cpu, sd) {
enum cpu_idle_type itype;
@@ -64,6 +65,7 @@ static int show_schedstat(struct seq_file *seq, void *v)
sd->ttwu_wake_remote, sd->ttwu_move_affine,
sd->ttwu_move_balance);
}
+ rcu_read_unlock();
preempt_enable();
#endif
}
--
1.7.1
--
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/
Powered by blists - more mailing lists