linux-kernel - [patch V2 09/17] timers: Rename del_timer_sync() to timer_delete

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Message-ID: <20221122173648.619071341@linutronix.de>
Date:   Tue, 22 Nov 2022 18:44:58 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Linus Torvalds <torvalds@...uxfoundation.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Anna-Maria Behnsen <anna-maria@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Julia Lawall <Julia.Lawall@...ia.fr>,
        Arnd Bergmann <arnd@...db.de>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Marc Zyngier <maz@...nel.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        linux-bluetooth@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Subject: [patch V2 09/17] timers: Rename del_timer_sync() to timer_delete_sync()

The timer related functions do not have a strict timer_ prefixed namespace
which is really annoying.

Rename del_timer_sync() to timer_delete_sync() and provide del_timer_sync()
as a wrapper. Document that del_timer_sync() is not for new code.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Steven Rostedt (Google) <rostedt@...dmis.org>
Tested-by: Guenter Roeck <linux@...ck-us.net>
---
 include/linux/timer.h |   15 ++++++++++++++-
 kernel/time/timer.c   |   18 +++++++++---------
 2 files changed, 23 insertions(+), 10 deletions(-)

--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -183,7 +183,20 @@ extern int timer_reduce(struct timer_lis
 extern void add_timer(struct timer_list *timer);
 
 extern int try_to_del_timer_sync(struct timer_list *timer);
-extern int del_timer_sync(struct timer_list *timer);
+extern int timer_delete_sync(struct timer_list *timer);
+
+/**
+ * del_timer_sync - Delete a pending timer and wait for a running callback
+ * @timer:	The timer to be deleted
+ *
+ * See timer_delete_sync() for detailed explanation.
+ *
+ * Do not use in new code. Use timer_delete_sync() instead.
+ */
+static inline int del_timer_sync(struct timer_list *timer)
+{
+	return timer_delete_sync(timer);
+}
 
 extern void init_timers(void);
 struct hrtimer;
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1083,7 +1083,7 @@ static inline int
 		/*
 		 * We are trying to schedule the timer on the new base.
 		 * However we can't change timer's base while it is running,
-		 * otherwise del_timer_sync() can't detect that the timer's
+		 * otherwise timer_delete_sync() can't detect that the timer's
 		 * handler yet has not finished. This also guarantees that the
 		 * timer is serialized wrt itself.
 		 */
@@ -1257,7 +1257,7 @@ EXPORT_SYMBOL_GPL(add_timer_on);
  * @timer:	The timer to be deactivated
  *
  * The function only deactivates a pending timer, but contrary to
- * del_timer_sync() it does not take into account whether the timers
+ * timer_delete_sync() it does not take into account whether the timers
  * callback function is concurrently executed on a different CPU or not.
  * It neither prevents rearming of the timer.  If @timer can be rearmed
  * concurrently then the return value of this function is meaningless.
@@ -1393,7 +1393,7 @@ static inline void del_timer_wait_runnin
 #endif
 
 /**
- * del_timer_sync - Deactivate a timer and wait for the handler to finish.
+ * timer_delete_sync - Deactivate a timer and wait for the handler to finish.
  * @timer:	The timer to be deactivated
  *
  * Synchronization rules: Callers must prevent restarting of the timer,
@@ -1415,10 +1415,10 @@ static inline void del_timer_wait_runnin
  *    spin_lock_irq(somelock);
  *                                     <IRQ>
  *                                        spin_lock(somelock);
- *    del_timer_sync(mytimer);
+ *    timer_delete_sync(mytimer);
  *    while (base->running_timer == mytimer);
  *
- * Now del_timer_sync() will never return and never release somelock.
+ * Now timer_delete_sync() will never return and never release somelock.
  * The interrupt on the other CPU is waiting to grab somelock but it has
  * interrupted the softirq that CPU0 is waiting to finish.
  *
@@ -1431,7 +1431,7 @@ static inline void del_timer_wait_runnin
  * * %0	- The timer was not pending
  * * %1	- The timer was pending and deactivated
  */
-int del_timer_sync(struct timer_list *timer)
+int timer_delete_sync(struct timer_list *timer)
 {
 	int ret;
 
@@ -1471,7 +1471,7 @@ int del_timer_sync(struct timer_list *ti
 
 	return ret;
 }
-EXPORT_SYMBOL(del_timer_sync);
+EXPORT_SYMBOL(timer_delete_sync);
 
 static void call_timer_fn(struct timer_list *timer,
 			  void (*fn)(struct timer_list *),
@@ -1493,8 +1493,8 @@ static void call_timer_fn(struct timer_l
 #endif
 	/*
 	 * Couple the lock chain with the lock chain at
-	 * del_timer_sync() by acquiring the lock_map around the fn()
-	 * call here and in del_timer_sync().
+	 * timer_delete_sync() by acquiring the lock_map around the fn()
+	 * call here and in timer_delete_sync().
 	 */
 	lock_map_acquire(&lockdep_map);