This is a note to let you know that I've just added the patch titled
LoongArch: Lately init pmu after smp is online
to the 6.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
loongarch-lately-init-pmu-after-smp-is-online.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 3f9b50a94765e82e9377a3bbb55087dce314a966
Author: Bibo Mao <maobibo@xxxxxxxxxxx>
Date: Thu Apr 25 22:17:52 2024 +0800
LoongArch: Lately init pmu after smp is online
[ Upstream commit f3334ebb8a2a1841c2824594dd992e66de19deb2 ]
There is an smp function call named reset_counters() to init PMU
registers of every CPU in PMU initialization state. It requires that all
CPUs are online. However there is an early_initcall() wrapper for the
PMU init funciton init_hw_perf_events(), so that pmu init funciton is
called in do_pre_smp_initcalls() which before function smp_init().
Function reset_counters() cannot work on other CPUs since they haven't
boot up still.
Here replace the wrapper early_initcall() with pure_initcall(), so that
the PMU init function is called after every cpu is online.
Signed-off-by: Bibo Mao <maobibo@xxxxxxxxxxx>
Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/loongarch/kernel/perf_event.c b/arch/loongarch/kernel/perf_event.c
index 0491bf453cd49..cac7cba81b65f 100644
--- a/arch/loongarch/kernel/perf_event.c
+++ b/arch/loongarch/kernel/perf_event.c
@@ -884,4 +884,4 @@ static int __init init_hw_perf_events(void)
return 0;
}
-early_initcall(init_hw_perf_events);
+pure_initcall(init_hw_perf_events);
