linux-kernel - [PATCH v4 10/14] kernel: Move various core kernel usages to call_rcu

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Message-Id: <20220819204857.3066329-11-joel@joelfernandes.org>
Date:   Fri, 19 Aug 2022 20:48:53 +0000
From:   "Joel Fernandes (Google)" <joel@...lfernandes.org>
To:     linux-kernel@...r.kernel.org
Cc:     "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        paulmck@...nel.org,
        Rushikesh S Kadam <rushikesh.s.kadam@...el.com>,
        "Uladzislau Rezki (Sony)" <urezki@...il.com>,
        Neeraj upadhyay <neeraj.iitr10@...il.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        rcu <rcu@...r.kernel.org>, vineeth@...byteword.org
Subject: [PATCH v4 10/14] kernel: Move various core kernel usages to call_rcu_lazy()

Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
---
 kernel/exit.c              | 2 +-
 kernel/pid.c               | 2 +-
 kernel/time/posix-timers.c | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/exit.c b/kernel/exit.c
index 853c6a943fce..14cde19ff4c2 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -180,7 +180,7 @@ static void delayed_put_task_struct(struct rcu_head *rhp)
 void put_task_struct_rcu_user(struct task_struct *task)
 {
 	if (refcount_dec_and_test(&task->rcu_users))
-		call_rcu(&task->rcu, delayed_put_task_struct);
+		call_rcu_lazy(&task->rcu, delayed_put_task_struct);
 }
 
 void release_task(struct task_struct *p)
diff --git a/kernel/pid.c b/kernel/pid.c
index 2fc0a16ec77b..5a5144519d70 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -153,7 +153,7 @@ void free_pid(struct pid *pid)
 	}
 	spin_unlock_irqrestore(&pidmap_lock, flags);
 
-	call_rcu(&pid->rcu, delayed_put_pid);
+	call_rcu_lazy(&pid->rcu, delayed_put_pid);
 }
 
 struct pid *alloc_pid(struct pid_namespace *ns, pid_t *set_tid,
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index 06d1236b3804..63489c4070cd 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -485,7 +485,7 @@ static void release_posix_timer(struct k_itimer *tmr, int it_id_set)
 	}
 	put_pid(tmr->it_pid);
 	sigqueue_free(tmr->sigq);
-	call_rcu(&tmr->rcu, k_itimer_rcu_free);
+	call_rcu_lazy(&tmr->rcu, k_itimer_rcu_free);
 }
 
 static int common_timer_create(struct k_itimer *new_timer)
-- 
2.37.2.609.g9ff673ca1a-goog