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rcu: Replace this_cpu_ptr() with __this_cpu_read() 

Because __this_cpu_read() can be lighter weight than equivalent uses of
this_cpu_ptr(), this commit replaces the latter with the former.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Paul E. McKenney 2018-11-05 14:20:57 -08:00
parent 05f415715c
commit 117f683c6e
1 changed files with 1 additions and 1 deletions
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2
kernel/rcu/tree_plugin.h
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@ -597,7 +597,7 @@ rcu_preempt_deferred_qs_irqrestore(struct task_struct *t, unsigned long flags)
*/
static bool rcu_preempt_need_deferred_qs(struct task_struct *t)
{
return (this_cpu_ptr(&rcu_data)->deferred_qs ||
return (__this_cpu_read(rcu_data.deferred_qs) ||
READ_ONCE(t->rcu_read_unlock_special.s)) &&
t->rcu_read_lock_nesting <= 0;
}