[PATCH] rcu: shrink each possible cpu krcp

qiang.zhang
2020-08-14T06:47:00Z

From: Zqiang <qiang.zhang@windriver.com>

Due to cpu hotplug. some cpu may be offline after call "kfree_call_rcu"
func, if the shrinker is triggered at this time, we should drain each
possible cpu "krcp".

Signed-off-by: Zqiang <qiang.zhang@windriver.com>
---
kernel/rcu/tree.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 8ce77d9ac716..619ccbb3fe4b 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3443,7 +3443,7 @@ kfree_rcu_shrink_count(struct shrinker *shrink, struct shrink_control *sc)
unsigned long count = 0;

/* Snapshot count of all CPUs */
- for_each_online_cpu(cpu) {
+ for_each_possible_cpu(cpu) {
struct kfree_rcu_cpu *krcp = per_cpu_ptr(&krc, cpu);

count += READ_ONCE(krcp->count);
@@ -3458,7 +3458,7 @@ kfree_rcu_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
int cpu, freed = 0;
unsigned long flags;

- for_each_online_cpu(cpu) {
+ for_each_possible_cpu(cpu) {
int count;
struct kfree_rcu_cpu *krcp = per_cpu_ptr(&krc, cpu);

@@ -3491,7 +3491,7 @@ void __init kfree_rcu_scheduler_running(void)
int cpu;
unsigned long flags;

- for_each_online_cpu(cpu) {
+ for_each_possible_cpu(cpu) {
struct kfree_rcu_cpu *krcp = per_cpu_ptr(&krc, cpu);

raw_spin_lock_irqsave(&krcp->lock, flags);
--
2.17.1