linux-kernel - [PATCH, RFC 30/30] sched: remove sleep

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Message-Id: <1388664474-1710039-31-git-send-email-arnd@arndb.de>
Date:	Thu,  2 Jan 2014 13:07:54 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-kernel@...r.kernel.org
Cc:	Arnd Bergmann <arnd@...db.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: [PATCH, RFC 30/30] sched: remove sleep_on() and friends

We probably should have done this 15 years ago. I have created patches
for every remaining user of the four sleep_on variants that are all
broken, and this patch should get applied as soon as all of the other
patches are merged.

If you are reading this changeset because you are looking for the
functions I removed, please convert your code to use wait_event,
wait_for_completion or an open-coded prepare_to_wait loop.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...nel.org>
---
 Documentation/DocBook/kernel-hacking.tmpl | 10 -------
 include/linux/wait.h                      | 11 --------
 kernel/sched/core.c                       | 46 -------------------------------
 3 files changed, 67 deletions(-)

diff --git a/Documentation/DocBook/kernel-hacking.tmpl b/Documentation/DocBook/kernel-hacking.tmpl
index d0758b24..bd9015d 100644
--- a/Documentation/DocBook/kernel-hacking.tmpl
+++ b/Documentation/DocBook/kernel-hacking.tmpl
@@ -850,16 +850,6 @@ printk(KERN_INFO "my ip: %pI4\n", &amp;ipaddress);
     <returnvalue>-ERESTARTSYS</returnvalue> if a signal is received.
     The <function>wait_event()</function> version ignores signals.
    </para>
-   <para>
-   Do not use the <function>sleep_on()</function> function family -
-   it is very easy to accidentally introduce races; almost certainly
-   one of the <function>wait_event()</function> family will do, or a
-   loop around <function>schedule_timeout()</function>. If you choose
-   to loop around <function>schedule_timeout()</function> remember
-   you must set the task state (with 
-   <function>set_current_state()</function>) on each iteration to avoid
-   busy-looping.
-   </para>
  
   </sect1>
 
diff --git a/include/linux/wait.h b/include/linux/wait.h
index eaa00b1..02c5a31 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -803,17 +803,6 @@ do {									\
 	__ret;								\
 })
 
-
-/*
- * These are the old interfaces to sleep waiting for an event.
- * They are racy.  DO NOT use them, use the wait_event* interfaces above.
- * We plan to remove these interfaces.
- */
-extern void sleep_on(wait_queue_head_t *q);
-extern long sleep_on_timeout(wait_queue_head_t *q, signed long timeout);
-extern void interruptible_sleep_on(wait_queue_head_t *q);
-extern long interruptible_sleep_on_timeout(wait_queue_head_t *q, signed long timeout);
-
 /*
  * Waitqueues which are removed from the waitqueue_head at wakeup time
  */
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index a88f4a4..6272dee 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2701,52 +2701,6 @@ int default_wake_function(wait_queue_t *curr, unsigned mode, int wake_flags,
 }
 EXPORT_SYMBOL(default_wake_function);
 
-static long __sched
-sleep_on_common(wait_queue_head_t *q, int state, long timeout)
-{
-	unsigned long flags;
-	wait_queue_t wait;
-
-	init_waitqueue_entry(&wait, current);
-
-	__set_current_state(state);
-
-	spin_lock_irqsave(&q->lock, flags);
-	__add_wait_queue(q, &wait);
-	spin_unlock(&q->lock);
-	timeout = schedule_timeout(timeout);
-	spin_lock_irq(&q->lock);
-	__remove_wait_queue(q, &wait);
-	spin_unlock_irqrestore(&q->lock, flags);
-
-	return timeout;
-}
-
-void __sched interruptible_sleep_on(wait_queue_head_t *q)
-{
-	sleep_on_common(q, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
-}
-EXPORT_SYMBOL(interruptible_sleep_on);
-
-long __sched
-interruptible_sleep_on_timeout(wait_queue_head_t *q, long timeout)
-{
-	return sleep_on_common(q, TASK_INTERRUPTIBLE, timeout);
-}
-EXPORT_SYMBOL(interruptible_sleep_on_timeout);
-
-void __sched sleep_on(wait_queue_head_t *q)
-{
-	sleep_on_common(q, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
-}
-EXPORT_SYMBOL(sleep_on);
-
-long __sched sleep_on_timeout(wait_queue_head_t *q, long timeout)
-{
-	return sleep_on_common(q, TASK_UNINTERRUPTIBLE, timeout);
-}
-EXPORT_SYMBOL(sleep_on_timeout);
-
 #ifdef CONFIG_RT_MUTEXES
 
 /*
-- 
1.8.3.2

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