* [PATCH AUTOSEL 6.6 16/19] LoongArch: Lately init pmu after smp is online
[not found] <20240507225910.390914-1-sashal@kernel.org>
@ 2024-05-07 22:58 ` Sasha Levin
0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2024-05-07 22:58 UTC (permalink / raw
To: linux-kernel, stable
Cc: Bibo Mao, Huacai Chen, Sasha Levin, peterz, mingo, acme, namhyung,
chenhuacai, linux-perf-users, loongarch
From: Bibo Mao <maobibo@loongson.cn>
[ 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@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/loongarch/kernel/perf_event.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
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);
--
2.43.0
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2024-05-07 22:58 ` [PATCH AUTOSEL 6.6 16/19] LoongArch: Lately init pmu after smp is online Sasha Levin
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