linux-kernel - [PATCH AUTOSEL 6.1 10/12] LoongArch: Lately init pmu after smp is online

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Date: Tue,  7 May 2024 19:00:12 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Bibo Mao <maobibo@...ngson.cn>,
	Huacai Chen <chenhuacai@...ngson.cn>,
	Sasha Levin <sashal@...nel.org>,
	peterz@...radead.org,
	mingo@...hat.com,
	acme@...nel.org,
	namhyung@...nel.org,
	chenhuacai@...nel.org,
	linux-perf-users@...r.kernel.org,
	loongarch@...ts.linux.dev
Subject: [PATCH AUTOSEL 6.1 10/12] LoongArch: Lately init pmu after smp is online

From: Bibo Mao <maobibo@...ngson.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@...ngson.cn>
Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
Signed-off-by: Sasha Levin <sashal@...nel.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 3a2edb157b65a..1563bf47f3e2c 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