commit 4e231c7962ce711c7d8c2a4dc23ecd1e8fc28363
author Peter Zijlstra <a.p.zijlstra@chello.nl> Thu Sep 09 21:01:59 2010 +0200
committer Ingo Molnar <mingo@elte.hu> Thu Sep 09 21:07:09 2010 +0200
tree 05af30e5c2f1084d8e77c89f0e55beaafa2194c0
parent 1b9a644fece117cfa5474a2388d6b89d1baf8ddf

perf: Fix up delayed_put_task_struct()

I missed a perf_event_ctxp user when converting it to an array. Pull this
last user into perf_event.c as well and fix it up.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

include/linux/perf_event.h

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index c117352..93bf53a 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -889,6 +889,7 @@
 extern int perf_event_init_task(struct task_struct *child);
 extern void perf_event_exit_task(struct task_struct *child);
 extern void perf_event_free_task(struct task_struct *task);
+extern void perf_event_delayed_put(struct task_struct *task);
 extern void set_perf_event_pending(void);
 extern void perf_event_do_pending(void);
 extern void perf_event_print_debug(void);
@@ -1067,6 +1068,7 @@
 static inline int perf_event_init_task(struct task_struct *child)	{ return 0; }
 static inline void perf_event_exit_task(struct task_struct *child)	{ }
 static inline void perf_event_free_task(struct task_struct *task)	{ }
+static inline void perf_event_delayed_put(struct task_struct *task)	{ }
 static inline void perf_event_do_pending(void)				{ }
 static inline void perf_event_print_debug(void)				{ }
 static inline int perf_event_task_disable(void)				{ return -EINVAL; }

kernel/exit.c

diff --git a/kernel/exit.c b/kernel/exit.c
index 0312022..e2bdf37 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -149,9 +149,7 @@
 {
 	struct task_struct *tsk = container_of(rhp, struct task_struct, rcu);
 
-#ifdef CONFIG_PERF_EVENTS
-	WARN_ON_ONCE(tsk->perf_event_ctxp);
-#endif
+	perf_event_delayed_put(tsk);
 	trace_sched_process_free(tsk);
 	put_task_struct(tsk);
 }

kernel/perf_event.c

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 9819a69..eaf1c5d 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -5893,6 +5893,14 @@
 	}
 }
 
+void perf_event_delayed_put(struct task_struct *task)
+{
+	int ctxn;
+
+	for_each_task_context_nr(ctxn)
+		WARN_ON_ONCE(task->perf_event_ctxp[ctxn]);
+}
+
 /*
  * inherit a event from parent task to child task:
  */