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Subject[PATCH -tip] sched: more sched_domain iterations fix
Date
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@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.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


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