[PATCH v3 14/15] lib: convert process iterator to for_each_process_rculock

[Ye Liu]

From: Ye Liu <liuye at kylinos.cn>

Replace the manual rcu_read_lock()/rcu_read_unlock() pair combined
with for_each_process() loop in lib/ with for_each_process_rculock(),
which scopes the RCU read lock to the loop body via scoped_guard(rcu).

No functional change.

Signed-off-by: Ye Liu <liuye at kylinos.cn>
Acked-by: Michal Hocko <mhocko at suse.com>
Reviewed-by: Lorenzo Stoakes (ARM) <ljs at kernel.org>
Reviewed-by: Gregory Price (Meta) <gourry at gourry.net>
Reviewed-by: SJ Park <sj at kernel.org>
---
Changes in v2:
  - Rename *_rcu to *_rculock
 lib/is_single_threaded.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/lib/is_single_threaded.c b/lib/is_single_threaded.c
index 8c98b20bfc41..4e7fe85454ab 100644
--- a/lib/is_single_threaded.c
+++ b/lib/is_single_threaded.c
@@ -26,8 +26,7 @@ bool current_is_single_threaded(void)
 		return true;
 
 	ret = false;
-	rcu_read_lock();
-	for_each_process(p) {
+	for_each_process_rculock(p) {
 		if (unlikely(p->flags & PF_KTHREAD))
 			continue;
 		if (unlikely(p == task->group_leader))
@@ -48,7 +47,5 @@ bool current_is_single_threaded(void)
 	}
 	ret = true;
 found:
-	rcu_read_unlock();
-
 	return ret;
 }
-- 
2.25.1