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workqueue: introduce create_rt_workqueue

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create_rt_workqueue will create a real time prioritized workqueue.
This is needed for the conversion of stop_machine to a workqueue based
implementation.
This patch adds yet another parameter to __create_workqueue_key to tell
it that we want an rt workqueue.
However it looks like we rather should have something like "int type"
instead of singlethread, freezable and rt.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Heiko Carstens 2008-10-13 23:50:09 +02:00 • committed by Rusty Russell
parent a802dd0eb5
commit 0d557dc97f
2 changed files with 16 additions and 9 deletions
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18
include/linux/workqueue.h
View file

@ -149,11 +149,11 @@ struct execute_work {
extern struct workqueue_struct *
__create_workqueue_key(const char *name, int singlethread,
int freezeable, struct lock_class_key *key,
int freezeable, int rt, struct lock_class_key *key,
const char *lock_name);
#ifdef CONFIG_LOCKDEP
#define __create_workqueue(name, singlethread, freezeable) \
#define __create_workqueue(name, singlethread, freezeable, rt) \
({ \
static struct lock_class_key __key; \
const char *__lock_name; \
@ -164,17 +164,19 @@ __create_workqueue_key(const char *name, int singlethread,
__lock_name = #name; \
\
__create_workqueue_key((name), (singlethread), \
(freezeable), &__key, \
(freezeable), (rt), &__key, \
__lock_name); \
})
#else
#define __create_workqueue(name, singlethread, freezeable) \
__create_workqueue_key((name), (singlethread), (freezeable), NULL, NULL)
#define __create_workqueue(name, singlethread, freezeable, rt) \
__create_workqueue_key((name), (singlethread), (freezeable), (rt), \
NULL, NULL)
#endif
#define create_workqueue(name) __create_workqueue((name), 0, 0)
#define create_freezeable_workqueue(name) __create_workqueue((name), 1, 1)
#define create_singlethread_workqueue(name) __create_workqueue((name), 1, 0)
#define create_workqueue(name) __create_workqueue((name), 0, 0, 0)
#define create_rt_workqueue(name) __create_workqueue((name), 0, 0, 1)
#define create_freezeable_workqueue(name) __create_workqueue((name), 1, 1, 0)
#define create_singlethread_workqueue(name) __create_workqueue((name), 1, 0, 0)
extern void destroy_workqueue(struct workqueue_struct *wq);