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| author | Peter Zijlstra <peterz@infradead.org> | 2018-03-15 17:36:56 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-03-16 20:44:12 +0100 |
| commit | edb39592a5877bd91b2e6ee15194268f35b04892 (patch) | |
| tree | 6396a76854da50f0df271c7bf4b6cc7c1d45ca8a /drivers/perf/xgene_pmu.c | |
| parent | 32ff77e8cc9e66cc4fb38098f64fd54cc8f54573 (diff) | |
| download | lwn-edb39592a5877bd91b2e6ee15194268f35b04892.tar.gz lwn-edb39592a5877bd91b2e6ee15194268f35b04892.zip | |
perf: Fix sibling iteration
Mark noticed that the change to sibling_list changed some iteration
semantics; because previously we used group_list as list entry,
sibling events would always have an empty sibling_list.
But because we now use sibling_list for both list head and list entry,
siblings will report as having siblings.
Fix this with a custom for_each_sibling_event() iterator.
Fixes: 8343aae66167 ("perf/core: Remove perf_event::group_entry")
Reported-by: Mark Rutland <mark.rutland@arm.com>
Suggested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: vincent.weaver@maine.edu
Cc: alexander.shishkin@linux.intel.com
Cc: torvalds@linux-foundation.org
Cc: alexey.budankov@linux.intel.com
Cc: valery.cherepennikov@intel.com
Cc: eranian@google.com
Cc: acme@redhat.com
Cc: linux-tip-commits@vger.kernel.org
Cc: davidcc@google.com
Cc: kan.liang@intel.com
Cc: Dmitry.Prohorov@intel.com
Cc: jolsa@redhat.com
Link: https://lkml.kernel.org/r/20180315170129.GX4043@hirez.programming.kicks-ass.net
Diffstat (limited to 'drivers/perf/xgene_pmu.c')
| -rw-r--r-- | drivers/perf/xgene_pmu.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/perf/xgene_pmu.c b/drivers/perf/xgene_pmu.c index f1f4a56cab5e..6bdb1dad805f 100644 --- a/drivers/perf/xgene_pmu.c +++ b/drivers/perf/xgene_pmu.c @@ -949,11 +949,11 @@ static int xgene_perf_event_init(struct perf_event *event) !is_software_event(event->group_leader)) return -EINVAL; - list_for_each_entry(sibling, &event->group_leader->sibling_list, - sibling_list) + for_each_sibling_event(sibling, event->group_leader) { if (sibling->pmu != event->pmu && !is_software_event(sibling)) return -EINVAL; + } return 0; } |