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rcu: Per-CPU operation cleanups to rcu_*_qs() functions

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The rcu_bh_qs(), rcu_preempt_qs(), and rcu_sched_qs() functions use
old-style per-CPU variable access and write to ->passed_quiesce even
if it is already set.  This commit therefore updates to use the new-style
per-CPU variable access functions and avoids the spurious writes.
This commit also eliminates the "cpu" argument to these functions because
they are always invoked on the indicated CPU.

Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2014-08-14 16:38:46 -07:00
parent 1d082fd061
commit 284a8c93af
6 changed files with 41 additions and 36 deletions
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include/linux/rcutiny.h
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@ -80,7 +80,7 @@ static inline void kfree_call_rcu(struct rcu_head *head,
static inline void rcu_note_context_switch(int cpu)
{
rcu_sched_qs(cpu);
rcu_sched_qs();
}
/*