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Commit cce1a165 authored by Oleg Nesterov's avatar Oleg Nesterov Committed by Linus Torvalds
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workqueue: introduce workqueue_struct->singlethread 



Add explicit workqueue_struct->singlethread flag.  This lessens .text a
little, but most importantly this allows us to manipulate wq->list without
changine the meaning of is_single_threaded().

Signed-off-by: default avatarOleg Nesterov <oleg@tv-sign.ru>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b1f4ec17

kernel/workqueue.c

+6 −4
Original line number Diff line number Diff line
@@ -58,8 +58,9 @@ struct cpu_workqueue_struct { 
 */

struct workqueue_struct {

	struct cpu_workqueue_struct *cpu_wq;

	struct list_head list;

	const char *name;

	struct list_head list; 	/* Empty if single thread */

	int singlethread;

	int freezeable;		/* Freeze threads during suspend */

};
@@ -76,7 +77,7 @@ static cpumask_t cpu_populated_map __read_mostly; 
/* If it's single threaded, it isn't in the list of workqueues. */

static inline int is_single_threaded(struct workqueue_struct *wq)

{

	return list_empty(&wq->list);

	return wq->singlethread;

}



static const cpumask_t *wq_cpu_map(struct workqueue_struct *wq)
@@ -401,7 +402,7 @@ static void flush_cpu_workqueue(struct cpu_workqueue_struct *cwq) 
void fastcall flush_workqueue(struct workqueue_struct *wq)

{

	const cpumask_t *cpu_map = wq_cpu_map(wq);

	int cpu

	int cpu;



	might_sleep();

	for_each_cpu_mask(cpu, *cpu_map)
@@ -694,10 +695,11 @@ struct workqueue_struct *__create_workqueue(const char *name, 
	}



	wq->name = name;

	wq->singlethread = singlethread;

	wq->freezeable = freezeable;

	INIT_LIST_HEAD(&wq->list);



	if (singlethread) {

		INIT_LIST_HEAD(&wq->list);

		cwq = init_cpu_workqueue(wq, singlethread_cpu);

		err = create_workqueue_thread(cwq, singlethread_cpu);

	} else {