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sched/wake_q: Provide WAKE_Q_HEAD_INITIALIZER()

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The RT specific spin/rwlock implementation requires special handling of the
to be woken waiters. Provide a WAKE_Q_HEAD_INITIALIZER(), which can be used by
the rtmutex code to implement an RT aware wake_q derivative.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210815211302.429918071@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-08-15 23:27:49 +02:00 • committed by Ingo Molnar
parent 6991436c2b
commit 2c8bb85151
1 changed files with 5 additions and 2 deletions
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7
include/linux/sched/wake_q.h
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@ -42,8 +42,11 @@ struct wake_q_head {
#define WAKE_Q_TAIL ((struct wake_q_node *) 0x01)
#define DEFINE_WAKE_Q(name) \
struct wake_q_head name = { WAKE_Q_TAIL, &name.first }
#define WAKE_Q_HEAD_INITIALIZER(name) \
{ WAKE_Q_TAIL, &name.first }
#define DEFINE_WAKE_Q(name) \
struct wake_q_head name = WAKE_Q_HEAD_INITIALIZER(name)
static inline void wake_q_init(struct wake_q_head *head)
{