rcu: use __this_cpu_read helper instead of per_cpu_ptr(p, raw_smp_processor_id())

PATCH Superseded Shan Wei 2 participants 2 messages Nov 9, 2012

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Shan Wei

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2012-11-09 02:21 UTC #0 lore raw

PATCH v3 6/9 rcu: use __this_cpu_read helper instead of per_cpu_ptr(p, raw_smp_processor_id())

From: Shan Wei <[email protected]>

Signed-off-by Shan Wei <[email protected]>

---
no changes vs v2.

---
 kernel/rcutree.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

kernel/rcutree.c +1 -1

index 74df86b..441b945 100644
@@ -1960,7 +1960,7 @@ static void force_quiescent_state(struct rcu_state *rsp)
 	struct rcu_node *rnp_old = NULL;
 
 	/* Funnel through hierarchy to reduce memory contention. */
-	rnp = per_cpu_ptr(rsp->rda, raw_smp_processor_id())->mynode;
+	rnp = __this_cpu_read(rsp->rda->mynode);
 	for (; rnp != NULL; rnp = rnp->parent) {
 		ret = (ACCESS_ONCE(rsp->gp_flags) & RCU_GP_FLAG_FQS) ||
 		      !raw_spin_trylock(&rnp->fqslock);

Signature · 1 line

1.7.1

Christoph Lameter

Acked-by on v3 6/9

2012-11-09 20:14 UTC #1 lore raw

kernel/rcutree.c static void force_quiescent_state(struct rcu_state *rsp) · line 1964

Quoted 4 lines · Shan Wei

kernel/rcutree.c +1 -1

 	/* Funnel through hierarchy to reduce memory contention. */
-	rnp = per_cpu_ptr(rsp->rda, raw_smp_processor_id())->mynode;
+	rnp = __this_cpu_read(rsp->rda->mynode);
 	for (; rnp != NULL; rnp = rnp->parent) {

Acked-by Christoph Lameter <[email protected]>