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authorLai Jiangshan <laijs@cn.fujitsu.com>2010-06-28 16:25:04 +0800
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2010-08-19 17:18:01 -0700
commit394f99a9007d4274f7076bb8553ab0ff9707688b (patch)
tree7d379f91321cec58b87fd5f5089947872689d591 /kernel/rcutree_plugin.h
parente546f485e1d7520ca0200502cdcc11b503f4805c (diff)
downloadop-kernel-dev-394f99a9007d4274f7076bb8553ab0ff9707688b.zip
op-kernel-dev-394f99a9007d4274f7076bb8553ab0ff9707688b.tar.gz
rcu: simplify the usage of percpu data
&percpu_data is compatible with allocated percpu data. And we use it and remove the "->rda[NR_CPUS]" array, saving significant storage on systems with large numbers of CPUs. This does add an additional level of indirection and thus an additional cache line referenced, but because ->rda is not used on the read side, this is OK. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Reviewed-by: Tejun Heo <tj@kernel.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'kernel/rcutree_plugin.h')
-rw-r--r--kernel/rcutree_plugin.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index 0e4f420..9906f85 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -154,7 +154,7 @@ static void rcu_preempt_note_context_switch(int cpu)
(t->rcu_read_unlock_special & RCU_READ_UNLOCK_BLOCKED) == 0) {
/* Possibly blocking in an RCU read-side critical section. */
- rdp = rcu_preempt_state.rda[cpu];
+ rdp = per_cpu_ptr(rcu_preempt_state.rda, cpu);
rnp = rdp->mynode;
raw_spin_lock_irqsave(&rnp->lock, flags);
t->rcu_read_unlock_special |= RCU_READ_UNLOCK_BLOCKED;
@@ -771,7 +771,7 @@ static void rcu_preempt_send_cbs_to_orphanage(void)
*/
static void __init __rcu_init_preempt(void)
{
- RCU_INIT_FLAVOR(&rcu_preempt_state, rcu_preempt_data);
+ rcu_init_one(&rcu_preempt_state, &rcu_preempt_data);
}
/*
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