perf_counter: fix uninitialized usage of event_list
Impact: fix boot crash
When doing the generic context switch event I ran into some early
boot hangs, which were caused by inf func recursion (event, fault,
event, fault).
I eventually tracked it down to event_list not being initialized
at the time of the first event. Fix this.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Orig-LKML-Reference: <20090319194233.195392657@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index b39456a..4c4e9eb 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -1506,7 +1506,7 @@
{
struct perf_counter *counter;
- if (list_empty(&ctx->event_list))
+ if (system_state != SYSTEM_RUNNING || list_empty(&ctx->event_list))
return;
rcu_read_lock();