[tip: perf/urgent] perf/cgroup: Correct indirection in perf_less_group_idx()

[tip-bot2 for Ian Rogers]

The following commit has been merged into the perf/urgent branch of tip:

Commit-ID:     24fb6b8e7c2280000966e3f2c9c8069a538518eb
Gitweb:        https://git.kernel.org/tip/24fb6b8e7c2280000966e3f2c9c8069a538518eb
Author:        Ian Rogers <irogers@xxxxxxxxxx>
AuthorDate:    Sat, 21 Mar 2020 09:43:31 -07:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Wed, 08 Apr 2020 11:33:45 +02:00

perf/cgroup: Correct indirection in perf_less_group_idx()

The void* in perf_less_group_idx() is to a member in the array which points
at a perf_event*, as such it is a perf_event**.

Reported-By: John Sperbeck <jsperbeck@xxxxxxxxxx>
Fixes: 6eef8a7116de ("perf/core: Use min_heap in visit_groups_merge()")
Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Link: https://lkml.kernel.org/r/20200321164331.107337-1-irogers@xxxxxxxxxx
---
 kernel/events/core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 7afd0b5..26de0a5 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3522,7 +3522,8 @@ static void cpu_ctx_sched_out(struct perf_cpu_context *cpuctx,
 
 static bool perf_less_group_idx(const void *l, const void *r)
 {
-	const struct perf_event *le = l, *re = r;
+	const struct perf_event *le = *(const struct perf_event **)l;
+	const struct perf_event *re = *(const struct perf_event **)r;
 
 	return le->group_index < re->group_index;
 }