This interface allows adding a job on a specific cpu. Although a work struct on a cpu will be scheduled to other cpu if the cpu dies, there is a recursion if a work task tries to offline the cpu it's running on. we need to schedule the task to a specific cpu in this case. http://bugzilla.kernel.org/show_bug.cgi?id=10897 Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx> Tested-by: Rus <harbour@xxxxxxxxxxx> --- include/linux/workqueue.h | 1 + kernel/workqueue.c | 38 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 39 insertions(+) Index: linux-2.6/include/linux/workqueue.h =================================================================== --- linux-2.6.orig/include/linux/workqueue.h 2008-07-03 11:13:23.000000000 +0800 +++ linux-2.6/include/linux/workqueue.h 2008-07-03 11:13:25.000000000 +0800 @@ -188,6 +188,7 @@ extern void flush_scheduled_work(void); extern int schedule_work(struct work_struct *work); +extern int schedule_work_on(int cpu, struct work_struct *work); extern int schedule_delayed_work(struct delayed_work *work, unsigned long delay); extern int schedule_delayed_work_on(int cpu, struct delayed_work *work, unsigned long delay); Index: linux-2.6/kernel/workqueue.c =================================================================== --- linux-2.6.orig/kernel/workqueue.c 2008-07-03 11:13:23.000000000 +0800 +++ linux-2.6/kernel/workqueue.c 2008-07-03 11:14:56.000000000 +0800 @@ -175,6 +175,31 @@ } EXPORT_SYMBOL_GPL(queue_work); +/** + * queue_work_on - queue work on specific cpu + * @cpu: CPU number to execute work on + * @wq: workqueue to use + * @work: work to queue + * + * Returns 0 if @work was already on a queue, non-zero otherwise. + * + * We queue the work to a specific CPU + */ +static int +queue_work_on(int cpu, struct workqueue_struct *wq, struct work_struct *work) +{ + int ret = 0; + + if (!test_and_set_bit(WORK_STRUCT_PENDING, work_data_bits(work))) { + BUG_ON(!list_empty(&work->entry)); + preempt_disable(); + __queue_work(wq_per_cpu(wq, cpu), work); + preempt_enable(); + ret = 1; + } + return ret; +} + static void delayed_work_timer_fn(unsigned long __data) { struct delayed_work *dwork = (struct delayed_work *)__data; @@ -553,6 +578,19 @@ } EXPORT_SYMBOL(schedule_work); +/* + * schedule_work_on - put work task on a specific cpu + * @cpu: cpu to put the work task on + * @work: job to be done + * + * This puts a job on a specific cpu + */ +int schedule_work_on(int cpu, struct work_struct *work) +{ + return queue_work_on(cpu, keventd_wq, work); +} +EXPORT_SYMBOL(schedule_work_on); + /** * schedule_delayed_work - put work task in global workqueue after delay * @dwork: job to be done _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
