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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-07-24 12:25:30 +0200
committerIngo Molnar <mingo@elte.hu>2009-08-02 14:26:14 +0200
commit8f48894fcc89ddec62e1762f73a0825793e59e91 (patch)
tree63b071af185d7049c854cbf4d000949968236bac /kernel/sched_rt.c
parent00aec93d10a051ea64f83eff75d4065a19508ea6 (diff)
downloadlinux-8f48894fcc89ddec62e1762f73a0825793e59e91.tar.bz2
sched: Add debug check to task_of()
A frequent mistake appears to be to call task_of() on a scheduler entity that is not actually a task, which can result in a wild pointer. Add a check to catch these mistakes. Suggested-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_rt.c')
-rw-r--r--kernel/sched_rt.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 13f728ef5b38..f365e66b3d49 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -3,15 +3,18 @@
* policies)
*/
+#ifdef CONFIG_RT_GROUP_SCHED
+
+#define rt_entity_is_task(rt_se) (!(rt_se)->my_q)
+
static inline struct task_struct *rt_task_of(struct sched_rt_entity *rt_se)
{
+#ifdef CONFIG_SCHED_DEBUG
+ WARN_ON_ONCE(!rt_entity_is_task(rt_se));
+#endif
return container_of(rt_se, struct task_struct, rt);
}
-#ifdef CONFIG_RT_GROUP_SCHED
-
-#define rt_entity_is_task(rt_se) (!(rt_se)->my_q)
-
static inline struct rq *rq_of_rt_rq(struct rt_rq *rt_rq)
{
return rt_rq->rq;
@@ -26,6 +29,11 @@ static inline struct rt_rq *rt_rq_of_se(struct sched_rt_entity *rt_se)
#define rt_entity_is_task(rt_se) (1)
+static inline struct task_struct *rt_task_of(struct sched_rt_entity *rt_se)
+{
+ return container_of(rt_se, struct task_struct, rt);
+}
+
static inline struct rq *rq_of_rt_rq(struct rt_rq *rt_rq)
{
return container_of(rt_rq, struct rq, rt);