From 7be51cc1c68dfa180ef84e71bcb4204237bb5620 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz@infradead.org>
Date: Tue, 4 Oct 2022 11:03:47 +0200
Subject: [PATCH] perf: Fix pmu_filter_match()
Mark reported that the new for_each_sibling_event() assertion triggers
in pmu_filter_match() -- which isn't always called with IRQs disabled
or ctx->mutex held.
Fixes: f3c0eba28704 ("perf: Add a few assertions")
Reported-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/YvvJq2f/7eFVcnNy@FVFF77S0Q05N
---
kernel/events/core.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 49bc3b5e6c8aa..b981b879bcd86 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -2226,16 +2226,22 @@ static inline int __pmu_filter_match(struct perf_event *event)
static inline int pmu_filter_match(struct perf_event *event)
{
struct perf_event *sibling;
+ unsigned long flags;
+ int ret = 1;
if (!__pmu_filter_match(event))
return 0;
+ local_irq_save(flags);
for_each_sibling_event(sibling, event) {
- if (!__pmu_filter_match(sibling))
- return 0;
+ if (!__pmu_filter_match(sibling)) {
+ ret = 0;
+ break;
+ }
}
+ local_irq_restore(flags);
- return 1;
+ return ret;
}
static inline int
--
GitLab