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authorXiaotian Feng <dfeng@redhat.com>2011-04-22 18:53:54 +0800
committerIngo Molnar <mingo@elte.hu>2011-05-28 17:02:54 +0200
commitcd4ae6adf8b1c21d88e83ed56afeeef97b28f356 (patch)
tree7a0625d20d135deb1e8c142fc13da6b4eaa6ea6c /kernel/sched_stats.h
parentdc7acbb2518f250050179c8581a972df3b6a24f1 (diff)
downloadop-kernel-dev-cd4ae6adf8b1c21d88e83ed56afeeef97b28f356.zip
op-kernel-dev-cd4ae6adf8b1c21d88e83ed56afeeef97b28f356.tar.gz
sched: More sched_domain iterations fixes
sched_domain iterations needs to be protected by rcu_read_lock() now, this patch adds another two places which needs the rcu lock, which is spotted by following suspicious rcu_dereference_check() usage warnings. kernel/sched_rt.c:1244 invoked rcu_dereference_check() without protection! kernel/sched_stats.h:41 invoked rcu_dereference_check() without protection! Signed-off-by: Xiaotian Feng <dfeng@redhat.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1303469634-11678-1-git-send-email-dfeng@redhat.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_stats.h')
-rw-r--r--kernel/sched_stats.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/sched_stats.h b/kernel/sched_stats.h
index 48ddf43..331e01b 100644
--- a/kernel/sched_stats.h
+++ b/kernel/sched_stats.h
@@ -37,7 +37,7 @@ 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;
@@ -64,7 +64,7 @@ static int show_schedstat(struct seq_file *seq, void *v)
sd->ttwu_wake_remote, sd->ttwu_move_affine,
sd->ttwu_move_balance);
}
- preempt_enable();
+ rcu_read_unlock();
#endif
}
kfree(mask_str);
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