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Message-ID: <163207602394.947088.16084244161007584223.tglx@xen13>
Date: Sun, 19 Sep 2021 20:28:09 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org
Subject: [GIT pull] perf/urgent for v5.15-rc2
Linus,
please pull the latest perf/urgent branch from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git perf-urgent-2021-09-19
up to: b89a05b21f46: events: Reuse value read using READ_ONCE instead of re-reading it
A single fix for the perf core where a value read with READ_ONCE() was
checked and then reread which makes all the checks invalid. Reuse the
already read value instead.
Thanks,
tglx
------------------>
Baptiste Lepers (1):
events: Reuse value read using READ_ONCE instead of re-reading it
kernel/events/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 744e8726c5b2..0c000cb01eeb 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -10193,7 +10193,7 @@ static void perf_event_addr_filters_apply(struct perf_event *event)
return;
if (ifh->nr_file_filters) {
- mm = get_task_mm(event->ctx->task);
+ mm = get_task_mm(task);
if (!mm)
goto restart;
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