make queue_delayed_work() friendly to flush_fork()

Currently typeof(delayed_work->work.data) is

	"struct workqueue_struct" when the timer is pending

	"struct cpu_workqueue_struct" whe the work is queued

This makes impossible to use flush_fork(delayed_work->work) in addition
to cancel_delayed_work/cancel_rearming_delayed_work, not good.

Change queue_delayed_work/delayed_work_timer_fn to use cwq, not wq. This
complicates (and uglifies) these functions a little bit, but alows us to
use flush_fork(dwork) and imho makes the whole code more consistent.

Also, document the fact that cancel_rearming_delayed_work() doesn't garantee
the completion of work->func() upon return.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 18 insertions, 10 deletions

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 7d1ebfc1a995..d107e1c3b071 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -90,18 +90,20 @@ static const cpumask_t *wq_cpu_map(struct workqueue_struct *wq)
  * Set the workqueue on which a work item is to be run
  * - Must *only* be called if the pending flag is set
  */
-static inline void set_wq_data(struct work_struct *work, void *wq)
+static inline void set_wq_data(struct work_struct *work,
+                                struct cpu_workqueue_struct *cwq)
 {
         unsigned long new;
 
         BUG_ON(!work_pending(work));
 
-        new = (unsigned long) wq | (1UL << WORK_STRUCT_PENDING);
+        new = (unsigned long) cwq | (1UL << WORK_STRUCT_PENDING);
         new |= WORK_STRUCT_FLAG_MASK & *work_data_bits(work);
         atomic_long_set(&work->data, new);
 }
 
-static inline void *get_wq_data(struct work_struct *work)
+static inline
+struct cpu_workqueue_struct *get_wq_data(struct work_struct *work)
 {
         return (void *) (atomic_long_read(&work->data) & WORK_STRUCT_WQ_DATA_MASK);
 }
@@ -157,7 +159,8 @@ EXPORT_SYMBOL_GPL(queue_work);
 void delayed_work_timer_fn(unsigned long __data)
 {
         struct delayed_work *dwork = (struct delayed_work *)__data;
-        struct workqueue_struct *wq = get_wq_data(&dwork->work);
+        struct cpu_workqueue_struct *cwq = get_wq_data(&dwork->work);
+        struct workqueue_struct *wq = cwq->wq;
         int cpu = smp_processor_id();
 
         if (unlikely(is_single_threaded(wq)))
@@ -189,8 +192,9 @@ int fastcall queue_delayed_work(struct workqueue_struct *wq,
                 BUG_ON(timer_pending(timer));
                 BUG_ON(!list_empty(&work->entry));
 
-                /* This stores wq for the moment, for the timer_fn */
-                set_wq_data(work, wq);
+                /* This stores cwq for the moment, for the timer_fn */
+                set_wq_data(work,
+                        per_cpu_ptr(wq->cpu_wq, raw_smp_processor_id()));
                 timer->expires = jiffies + delay;
                 timer->data = (unsigned long)dwork;
                 timer->function = delayed_work_timer_fn;
@@ -221,8 +225,9 @@ int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
                 BUG_ON(timer_pending(timer));
                 BUG_ON(!list_empty(&work->entry));
 
-                /* This stores wq for the moment, for the timer_fn */
-                set_wq_data(work, wq);
+                /* This stores cwq for the moment, for the timer_fn */
+                set_wq_data(work,
+                        per_cpu_ptr(wq->cpu_wq, raw_smp_processor_id()));
                 timer->expires = jiffies + delay;
                 timer->data = (unsigned long)dwork;
                 timer->function = delayed_work_timer_fn;
@@ -562,9 +567,12 @@ void flush_work_keventd(struct work_struct *work)
 EXPORT_SYMBOL(flush_work_keventd);
 
 /**
- * cancel_rearming_delayed_workqueue - reliably kill off a delayed work whose handler rearms the delayed work.
+ * cancel_rearming_delayed_workqueue - kill off a delayed work whose handler rearms the delayed work.
  * @wq:   the controlling workqueue structure
  * @dwork: the delayed work struct
+ *
+ * Note that the work callback function may still be running on return from
+ * cancel_delayed_work(). Run flush_workqueue() or flush_work() to wait on it.
  */
 void cancel_rearming_delayed_workqueue(struct workqueue_struct *wq,
                                        struct delayed_work *dwork)
@@ -579,7 +587,7 @@ void cancel_rearming_delayed_workqueue(struct workqueue_struct *wq,
 EXPORT_SYMBOL(cancel_rearming_delayed_workqueue);
 
 /**
- * cancel_rearming_delayed_work - reliably kill off a delayed keventd work whose handler rearms the delayed work.
+ * cancel_rearming_delayed_work - kill off a delayed keventd work whose handler rearms the delayed work.
  * @dwork: the delayed work struct
  */
 void cancel_rearming_delayed_work(struct delayed_work *dwork)