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authorArnd Bergmann <arnd@arndb.de>2014-04-07 19:33:06 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-07 22:24:06 +0400
commitb8780c363d808a726a34793caa900923d32b6b80 (patch)
tree06e8fe284ccbad76fb2fca0d9e982e5de49bf245
parent240cd6a817bd855e3f1e615ed9ae16407f8cfce6 (diff)
downloadlinux-b8780c363d808a726a34793caa900923d32b6b80.tar.xz
sched: remove sleep_on() and friends
This is the final piece in the puzzle, as all patches to remove the last users of \(interruptible_\|\)sleep_on\(_timeout\|\) have made it into the 3.15 merge window. The work was long overdue, and this interface in particular should not have survived the BKL removal that was done a couple of years ago. Citing Jon Corbet from http://lwn.net/2001/0201/kernel.php3": "[...] it was suggested that the janitors look for and fix all code that calls sleep_on() [...] since (1) almost all such code is incorrect, and (2) Linus has agreed that those functions should be removed in the 2.5 development series". We haven't quite made it for 2.5, but maybe we can merge this for 3.15. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--Documentation/DocBook/kernel-hacking.tmpl10
-rw-r--r--include/linux/wait.h11
-rw-r--r--kernel/sched/core.c46
3 files changed, 0 insertions, 67 deletions
diff --git a/Documentation/DocBook/kernel-hacking.tmpl b/Documentation/DocBook/kernel-hacking.tmpl
index d0758b241b23..bd9015d10cff 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 559044c79232..e7d9d9ed14f5 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 1d1b87b36778..0ff3f34bc7e3 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2845,52 +2845,6 @@ 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
/*