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Subject[PATCH] cpu/hotplug: simplify access percpu cpuhp_state
Date
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@baidu.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
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