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Message-ID: <tip-0176beaffbe9ed627b6a4dfa61d640f1a848086f@git.kernel.org>
Date: Fri, 30 Sep 2016 04:57:46 -0700
From: tip-bot for Oleg Nesterov <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, hannes@...xchg.org, mingo@...nel.org,
viro@...IV.linux.org.uk, efault@....de, tglx@...utronix.de,
torvalds@...ux-foundation.org, neilb@...e.de, bvanassche@....org,
peterz@...radead.org, oleg@...hat.com, hpa@...or.com
Subject: [tip:sched/core] sched/wait: Introduce init_wait_entry()
Commit-ID: 0176beaffbe9ed627b6a4dfa61d640f1a848086f
Gitweb: http://git.kernel.org/tip/0176beaffbe9ed627b6a4dfa61d640f1a848086f
Author: Oleg Nesterov <oleg@...hat.com>
AuthorDate: Tue, 6 Sep 2016 16:00:55 +0200
Committer: Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 30 Sep 2016 10:54:03 +0200
sched/wait: Introduce init_wait_entry()
The partial initialization of wait_queue_t in prepare_to_wait_event() looks
ugly. This was done to shrink .text, but we can simply add the new helper
which does the full initialization and shrink the compiled code a bit more.
And. This way prepare_to_wait_event() can have more users. In particular we
are ready to remove the signal_pending_state() checks from wait_bit_action_f
helpers and change __wait_on_bit_lock() to use prepare_to_wait_event().
Signed-off-by: Oleg Nesterov <oleg@...hat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Al Viro <viro@...IV.linux.org.uk>
Cc: Bart Van Assche <bvanassche@....org>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mike Galbraith <efault@....de>
Cc: Neil Brown <neilb@...e.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/20160906140055.GA6167@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
include/linux/wait.h | 9 +++------
kernel/sched/wait.c | 12 +++++++++---
2 files changed, 12 insertions(+), 9 deletions(-)
diff --git a/include/linux/wait.h b/include/linux/wait.h
index 19c75f9..2408e8d5 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -248,6 +248,8 @@ wait_queue_head_t *bit_waitqueue(void *, int);
(!__builtin_constant_p(state) || \
state == TASK_INTERRUPTIBLE || state == TASK_KILLABLE) \
+extern void init_wait_entry(wait_queue_t *__wait, int flags);
+
/*
* The below macro ___wait_event() has an explicit shadow of the __ret
* variable when used from the wait_event_*() macros.
@@ -266,12 +268,7 @@ wait_queue_head_t *bit_waitqueue(void *, int);
wait_queue_t __wait; \
long __ret = ret; /* explicit shadow */ \
\
- INIT_LIST_HEAD(&__wait.task_list); \
- if (exclusive) \
- __wait.flags = WQ_FLAG_EXCLUSIVE; \
- else \
- __wait.flags = 0; \
- \
+ init_wait_entry(&__wait, exclusive ? WQ_FLAG_EXCLUSIVE : 0); \
for (;;) { \
long __int = prepare_to_wait_event(&wq, &__wait, state);\
\
diff --git a/kernel/sched/wait.c b/kernel/sched/wait.c
index 0cb615d..4f70535 100644
--- a/kernel/sched/wait.c
+++ b/kernel/sched/wait.c
@@ -196,14 +196,20 @@ prepare_to_wait_exclusive(wait_queue_head_t *q, wait_queue_t *wait, int state)
}
EXPORT_SYMBOL(prepare_to_wait_exclusive);
+void init_wait_entry(wait_queue_t *wait, int flags)
+{
+ wait->flags = flags;
+ wait->private = current;
+ wait->func = autoremove_wake_function;
+ INIT_LIST_HEAD(&wait->task_list);
+}
+EXPORT_SYMBOL(init_wait_entry);
+
long prepare_to_wait_event(wait_queue_head_t *q, wait_queue_t *wait, int state)
{
unsigned long flags;
long ret = 0;
- wait->private = current;
- wait->func = autoremove_wake_function;
-
spin_lock_irqsave(&q->lock, flags);
if (unlikely(signal_pending_state(state, current))) {
/*
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