linux-kernel - [tip: smp/core] cpu/hotplug: Simplify access to percpu cpuhp

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Message-ID: <162195660432.29796.7925067914385420402.tip-bot2@tip-bot2>
Date:   Tue, 25 May 2021 15:30:04 -0000
From:   "tip-bot2 for Yuan ZhaoXiong" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Yuan ZhaoXiong <yuanzhaoxiong@...du.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Valentin Schneider <valentin.schneider@....com>,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: smp/core] cpu/hotplug: Simplify access to percpu cpuhp_state

The following commit has been merged into the smp/core branch of tip:

Commit-ID:     130708331bc6b03a3c3a78599333faddfebbd0f3
Gitweb:        https://git.kernel.org/tip/130708331bc6b03a3c3a78599333faddfebbd0f3
Author:        Yuan ZhaoXiong <yuanzhaoxiong@...du.com>
AuthorDate:    Sun, 23 May 2021 21:31:30 +08:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Tue, 25 May 2021 17:24:52 +02:00

cpu/hotplug: Simplify access to percpu cpuhp_state

It is unnecessary to invoke per_cpu_ptr() everytime to access cpuhp_state.
Use the available pointer instead.

Signed-off-by: Yuan ZhaoXiong <yuanzhaoxiong@...du.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Valentin Schneider <valentin.schneider@....com>
Link: https://lore.kernel.org/r/1621776690-13264-1-git-send-email-yuanzhaoxiong@baidu.com

---
 kernel/cpu.c | 4 ++--
 1 file 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));