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authorOleg Nesterov <oleg@tv-sign.ru>2008-07-25 01:47:47 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 10:53:40 -0700
commit1a4d9b0aa0d3c50314e57525a5e5ec2cfc48b4c8 (patch)
tree2ea94cce9fe2cfbcfdc2fd25d33e57f31e0b2699 /kernel
parent565b9b14e7f48131bca58840aa404bbef058fa89 (diff)
downloadlinux-2.6.34-ux500-1a4d9b0aa0d3c50314e57525a5e5ec2cfc48b4c8.tar.gz
workqueues: insert_work: use "list_head *" instead of "int tail"
insert_work() inserts the new work_struct before or after cwq->worklist, depending on the "int tail" parameter. Change it to accept "list_head *" instead, this shrinks .text a bit and allows us to insert the barrier after specific work_struct. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Jarek Poplawski <jarkao2@gmail.com> Cc: Max Krasnyansky <maxk@qualcomm.com> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/workqueue.c17
1 files changed, 7 insertions, 10 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 6fd158b2102..d9a2d65cc63 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -125,7 +125,7 @@ struct cpu_workqueue_struct *get_wq_data(struct work_struct *work)
}
static void insert_work(struct cpu_workqueue_struct *cwq,
- struct work_struct *work, int tail)
+ struct work_struct *work, struct list_head *head)
{
set_wq_data(work, cwq);
/*
@@ -133,10 +133,7 @@ static void insert_work(struct cpu_workqueue_struct *cwq,
* result of list_add() below, see try_to_grab_pending().
*/
smp_wmb();
- if (tail)
- list_add_tail(&work->entry, &cwq->worklist);
- else
- list_add(&work->entry, &cwq->worklist);
+ list_add_tail(&work->entry, head);
wake_up(&cwq->more_work);
}
@@ -146,7 +143,7 @@ static void __queue_work(struct cpu_workqueue_struct *cwq,
unsigned long flags;
spin_lock_irqsave(&cwq->lock, flags);
- insert_work(cwq, work, 1);
+ insert_work(cwq, work, &cwq->worklist);
spin_unlock_irqrestore(&cwq->lock, flags);
}
@@ -361,14 +358,14 @@ static void wq_barrier_func(struct work_struct *work)
}
static void insert_wq_barrier(struct cpu_workqueue_struct *cwq,
- struct wq_barrier *barr, int tail)
+ struct wq_barrier *barr, struct list_head *head)
{
INIT_WORK(&barr->work, wq_barrier_func);
__set_bit(WORK_STRUCT_PENDING, work_data_bits(&barr->work));
init_completion(&barr->done);
- insert_work(cwq, &barr->work, tail);
+ insert_work(cwq, &barr->work, head);
}
static int flush_cpu_workqueue(struct cpu_workqueue_struct *cwq)
@@ -388,7 +385,7 @@ static int flush_cpu_workqueue(struct cpu_workqueue_struct *cwq)
active = 0;
spin_lock_irq(&cwq->lock);
if (!list_empty(&cwq->worklist) || cwq->current_work != NULL) {
- insert_wq_barrier(cwq, &barr, 1);
+ insert_wq_barrier(cwq, &barr, &cwq->worklist);
active = 1;
}
spin_unlock_irq(&cwq->lock);
@@ -473,7 +470,7 @@ static void wait_on_cpu_work(struct cpu_workqueue_struct *cwq,
spin_lock_irq(&cwq->lock);
if (unlikely(cwq->current_work == work)) {
- insert_wq_barrier(cwq, &barr, 0);
+ insert_wq_barrier(cwq, &barr, cwq->worklist.next);
running = 1;
}
spin_unlock_irq(&cwq->lock);