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perf: Fix sibling iteration

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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: 8343aae661 ("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
This commit is contained in:
Peter Zijlstra 2018-03-15 17:36:56 +01:00 • committed by Thomas Gleixner
parent 32ff77e8cc
commit edb39592a5
19 changed files with 41 additions and 40 deletions
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2
arch/sparc/kernel/perf_event.c
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@ -1342,7 +1342,7 @@ static int collect_events(struct perf_event *group, int max_count,
events[n] = group->hw.event_base;
current_idx[n++] = PIC_NO_INDEX;
}
list_for_each_entry(event, &group->sibling_list, sibling_list) {
for_each_sibling_event(event, group) {
if (!is_software_event(event) &&
event->state != PERF_EVENT_STATE_OFF) {
if (n >= max_count)