linux-kernel - [PATCH V2 19/25] sched: Use bool function return values of true/false not 1/0

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Message-ID: <1427867186.18175.60.camel@perches.com>
Date:	Tue, 31 Mar 2015 22:46:26 -0700
From:	Joe Perches <joe@...ches.com>
To:	Jason Low <jason.low2@...com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH V2 19/25] sched: Use bool function return values of
 true/false not 1/0

Use the normal return values for bool functions

Update the other sets of ret in try_wait_for_completion.

Signed-off-by: Joe Perches <joe@...ches.com>
---

On Tue, 2015-03-31 at 22:17 -0700, Jason Low wrote:
> On Mon, Mar 30, 2015 at 4:46 PM, Joe Perches <joe@...ches.com> wrote:
> 
> >   *     try_wait_for_completion - try to decrement a completion without blocking
> >   *     @x:     completion structure
> >   *
> > - *     Return: 0 if a decrement cannot be done without blocking
> > - *              1 if a decrement succeeded.
> > + *     Return: true if a decrement cannot be done without blocking
> > + *             false if a decrement succeeded.
> The boolean logic was reversed in this comment. The function should be
> returning false if a decrement cannot be done without blocking, and
> true if a decrement succeeded.

Hi Jason, right, my typo, thanks for noticing.

 kernel/sched/auto_group.h |  2 +-
 kernel/sched/completion.c | 16 +++++++++-------
 2 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/kernel/sched/auto_group.h b/kernel/sched/auto_group.h
index 8bd0471..309b6f2 100644
--- a/kernel/sched/auto_group.h
+++ b/kernel/sched/auto_group.h
@@ -45,7 +45,7 @@ static inline void autogroup_init(struct task_struct *init_task) {  }
 static inline void autogroup_free(struct task_group *tg) { }
 static inline bool task_group_is_autogroup(struct task_group *tg)
 {
-	return 0;
+	return false;
 }
 
 static inline struct task_group *
diff --git a/kernel/sched/completion.c b/kernel/sched/completion.c
index 8d0f35d..cbccaa0 100644
--- a/kernel/sched/completion.c
+++ b/kernel/sched/completion.c
@@ -255,8 +255,8 @@ EXPORT_SYMBOL(wait_for_completion_killable_timeout);
  *	try_wait_for_completion - try to decrement a completion without blocking
  *	@x:	completion structure
  *
- *	Return: 0 if a decrement cannot be done without blocking
- *		 1 if a decrement succeeded.
+ *	Return: false if a decrement cannot be done without blocking
+ *		true if a decrement succeeded.
  *
  *	If a completion is being used as a counting completion,
  *	attempt to decrement the counter without blocking. This
@@ -266,7 +266,7 @@ EXPORT_SYMBOL(wait_for_completion_killable_timeout);
 bool try_wait_for_completion(struct completion *x)
 {
 	unsigned long flags;
-	int ret = 1;
+	bool ret;
 
 	/*
 	 * Since x->done will need to be locked only
@@ -275,13 +275,15 @@ bool try_wait_for_completion(struct completion *x)
 	 * return early in the blocking case.
 	 */
 	if (!READ_ONCE(x->done))
-		return 0;
+		return false;
 
 	spin_lock_irqsave(&x->wait.lock, flags);
-	if (!x->done)
-		ret = 0;
-	else
+	if (!x->done) {
+		ret = false;
+	} else {
 		x->done--;
+		ret = true;
+	}
 	spin_unlock_irqrestore(&x->wait.lock, flags);
 	return ret;
 }


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