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authorLinus Torvalds <torvalds@linux-foundation.org>2015-06-22 15:45:41 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-06-22 15:45:41 -0700
commit6bc4c3ad3619e1bcb4a6330e030007ace8ca465e (patch)
treedda9505c22e85417ee752ef90ff7848126cca0f0 /kernel
parentc58267e9fa7b0345dd9006939254701e3622ca6a (diff)
parent0f02adaa49af23ab9fa05375f4a237da6014401b (diff)
downloadlinux-6bc4c3ad3619e1bcb4a6330e030007ace8ca465e.tar.bz2
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf fixes from Ingo Molnar: "These are the left over fixes from the v4.1 cycle" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf tools: Fix build breakage if prefix= is specified perf/x86: Honor the architectural performance monitoring version perf/x86/intel: Fix PMI handling for Intel PT perf/x86/intel/bts: Fix DS area sharing with x86_pmu events perf/x86: Add more Broadwell model numbers perf: Fix ring_buffer_attach() RCU sync, again
Diffstat (limited to 'kernel')
-rw-r--r--kernel/events/core.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 9e0773d5d110..f2003b97ddc9 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -4331,20 +4331,20 @@ static void ring_buffer_attach(struct perf_event *event,
WARN_ON_ONCE(event->rcu_pending);
old_rb = event->rb;
- event->rcu_batches = get_state_synchronize_rcu();
- event->rcu_pending = 1;
-
spin_lock_irqsave(&old_rb->event_lock, flags);
list_del_rcu(&event->rb_entry);
spin_unlock_irqrestore(&old_rb->event_lock, flags);
- }
- if (event->rcu_pending && rb) {
- cond_synchronize_rcu(event->rcu_batches);
- event->rcu_pending = 0;
+ event->rcu_batches = get_state_synchronize_rcu();
+ event->rcu_pending = 1;
}
if (rb) {
+ if (event->rcu_pending) {
+ cond_synchronize_rcu(event->rcu_batches);
+ event->rcu_pending = 0;
+ }
+
spin_lock_irqsave(&rb->event_lock, flags);
list_add_rcu(&event->rb_entry, &rb->event_list);
spin_unlock_irqrestore(&rb->event_lock, flags);