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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@baidu.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Link: https://lore.kernel.org/r/1621776690-13264-1-git-send-email-yuanzhaoxiong@baidu.com
This commit is contained in:
Yuan ZhaoXiong 2021-05-23 21:31:30 +08:00 committed by Thomas Gleixner
parent c4681547bc
commit 130708331b
1 changed files with 2 additions and 2 deletions
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4
kernel/cpu.c
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@ -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));