linux-kernel - [PATCH] cpu/hotplug: simplify access percpu cpuhp

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Message-Id: <1621776690-13264-1-git-send-email-yuanzhaoxiong@baidu.com>
Date:   Sun, 23 May 2021 21:31:30 +0800
From:   Yuan ZhaoXiong <yuanzhaoxiong@...du.com>
To:     peterz@...radead.org, vincent.donnefort@....com,
        valentin.schneider@....com, mingo@...nel.org, bristot@...hat.com,
        npiggin@...il.com, tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] cpu/hotplug: simplify access percpu cpuhp_state

It is unnecessary to invoke per_cpu_ptr() function everytime to access
percpu cpuhp_state and use the variable st instead.

Signed-off-by: Yuan ZhaoXiong <yuanzhaoxiong@...du.com>
---
 kernel/cpu.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/cpu.c b/kernel/cpu.c
index e538518..2942cb4 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -961,7 +961,7 @@ static int takedown_cpu(unsigned int cpu)
 	int err;
 
 	/* Park the smpboot threads */
-	kthread_park(per_cpu_ptr(&cpuhp_state, cpu)->thread);
+	kthread_park(st->thread);
 
 	/*
 	 * Prevent irq alloc/free while the dying cpu reorganizes the
@@ -977,7 +977,7 @@ static int takedown_cpu(unsigned int cpu)
 		/* CPU refused to die */
 		irq_unlock_sparse();
 		/* Unpark the hotplug thread so we can rollback there */
-		kthread_unpark(per_cpu_ptr(&cpuhp_state, cpu)->thread);
+		kthread_unpark(st->thread);
 		return err;
 	}
 	BUG_ON(cpu_online(cpu));
-- 
1.7.1