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authorPeter Zijlstra <peterz@infradead.org>2018-03-15 17:36:56 +0100
committerThomas Gleixner <tglx@linutronix.de>2018-03-16 20:44:12 +0100
commitedb39592a5877bd91b2e6ee15194268f35b04892 (patch)
tree6396a76854da50f0df271c7bf4b6cc7c1d45ca8a /arch/x86/events
parent32ff77e8cc9e66cc4fb38098f64fd54cc8f54573 (diff)
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 'arch/x86/events')
-rw-r--r--arch/x86/events/core.c2
-rw-r--r--arch/x86/events/intel/uncore.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 77a4125b6b1f..bfc8f43909c1 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -990,7 +990,7 @@ static int collect_events(struct cpu_hw_events *cpuc, struct perf_event *leader,
if (!dogrp)
return n;
- list_for_each_entry(event, &leader->sibling_list, sibling_list) {
+ for_each_sibling_event(event, leader) {
if (!is_x86_event(event) ||
event->state <= PERF_EVENT_STATE_OFF)
continue;
diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
index 9e374cd22ad2..a7956fc7ca1d 100644
--- a/arch/x86/events/intel/uncore.c
+++ b/arch/x86/events/intel/uncore.c
@@ -354,7 +354,7 @@ uncore_collect_events(struct intel_uncore_box *box, struct perf_event *leader,
if (!dogrp)
return n;
- list_for_each_entry(event, &leader->sibling_list, sibling_list) {
+ for_each_sibling_event(event, leader) {
if (!is_box_event(box, event) ||
event->state <= PERF_EVENT_STATE_OFF)
continue;