rcuwait: Let rcuwait_wake_up() return whether or not a task was awoken (9d9a6ebf) · Commits · 戴 / test

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. Acked-by:

Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by:

Davidlohr Bueso <dbueso@suse.de> Message-Id: <20200424054837.5138-3-dave@stgolabs.net> Signed-off-by:

Paolo Bonzini <pbonzini@redhat.com>

include/linux/rcuwait.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -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(),

kernel/exit.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -227,8 +227,9 @@ repeat:
		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();
		@@ -248,8 +249,10 @@ 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);

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