linux-kernel - [PATCH 2/4] rcuwait: Let rcuwait_wake_up() return whether or not a task was awoken

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Date:   Mon, 23 Mar 2020 21:44:51 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     tglx@...utronix.de, pbonzini@...hat.com
Cc:     bigeasy@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
        torvalds@...ux-foundation.org, will@...nel.org,
        joel@...lfernandes.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, dave@...olabs.net,
        Davidlohr Bueso <dbueso@...e.de>
Subject: [PATCH 2/4] rcuwait: Let rcuwait_wake_up() return whether or not a task was awoken

Propagating the return value of wake_up_process() back to the caller
can come in handy for future users, such as for statistics or
accounting purposes.

Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
---
 include/linux/rcuwait.h | 2 +-
 kernel/exit.c           | 7 +++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/include/linux/rcuwait.h b/include/linux/rcuwait.h
index 2ffe1ee6d482..6ebb23258a27 100644
--- a/include/linux/rcuwait.h
+++ b/include/linux/rcuwait.h
@@ -25,7 +25,7 @@ static inline void rcuwait_init(struct rcuwait *w)
 	w->task = NULL;
 }
 
-extern void rcuwait_wake_up(struct rcuwait *w);
+extern int rcuwait_wake_up(struct rcuwait *w);
 
 /*
  * The caller is responsible for locking around rcuwait_wait_event(),
diff --git a/kernel/exit.c b/kernel/exit.c
index a33c0baffdae..dbddc9d83407 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -225,8 +225,9 @@ void release_task(struct task_struct *p)
 		goto repeat;
 }
 
-void rcuwait_wake_up(struct rcuwait *w)
+int rcuwait_wake_up(struct rcuwait *w)
 {
+	int ret = 0;
 	struct task_struct *task;
 
 	rcu_read_lock();
@@ -246,8 +247,10 @@ void rcuwait_wake_up(struct rcuwait *w)
 
 	task = rcu_dereference(w->task);
 	if (task)
-		wake_up_process(task);
+		ret = wake_up_process(task);
 	rcu_read_unlock();
+
+	return ret;
 }
 EXPORT_SYMBOL_GPL(rcuwait_wake_up);
 
-- 
2.16.4