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>
---
kernel/perf_counter.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
Index: linux-2.6/kernel/perf_counter.c
===================================================================
--- linux-2.6.orig/kernel/perf_counter.c
+++ linux-2.6/kernel/perf_counter.c
@@ -1506,7 +1506,7 @@ static void perf_swcounter_ctx_event(str
{
struct perf_counter *counter;
- if (list_empty(&ctx->event_list))
+ if (!ctx->is_active || list_empty(&ctx->event_list))
return;
rcu_read_lock();
diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index 219748d..ca226a9 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -124,6 +124,8 @@ extern struct cred init_cred;
# define INIT_PERF_COUNTERS(tsk) \
.perf_counter_ctx.counter_list = \
LIST_HEAD_INIT(tsk.perf_counter_ctx.counter_list), \
+ .perf_counter_ctx.event_list = \
+ LIST_HEAD_INIT(tsk.perf_counter_ctx.event_list), \
.perf_counter_ctx.lock = \
__SPIN_LOCK_UNLOCKED(tsk.perf_counter_ctx.lock),
#else
--
--
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