rcu: Improve srcu_readers_active_idx()'s cache locality

Expand the calls to srcu_readers_active_idx() from srcu_readers_active()
inline.  This change improves cache locality by interating over the CPUs
once rather than twice.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/kernel/srcu.c b/kernel/srcu.c
index e0139a274856..a43211c92863 100644
--- a/kernel/srcu.c
+++ b/kernel/srcu.c
@@ -193,7 +193,14 @@ static bool srcu_readers_active_idx_check(struct srcu_struct *sp, int idx)
  */
 static int srcu_readers_active(struct srcu_struct *sp)
 {
-        return srcu_readers_active_idx(sp, 0) + srcu_readers_active_idx(sp, 1);
+        int cpu;
+        unsigned long sum = 0;
+
+        for_each_possible_cpu(cpu) {
+                sum += ACCESS_ONCE(per_cpu_ptr(sp->per_cpu_ref, cpu)->c[0]);
+                sum += ACCESS_ONCE(per_cpu_ptr(sp->per_cpu_ref, cpu)->c[1]);
+        }
+        return sum;
 }
 
 /**