linux-kernel - [patch V3 07/64] sched/wake_q: Provide WAKE_Q_HEAD

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Date:   Thu, 05 Aug 2021 17:13:07 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Davidlohr Bueso <dave@...olabs.net>,
        Mike Galbraith <efault@....de>
Subject: [patch V3 07/64] sched/wake_q: Provide WAKE_Q_HEAD_INITIALIZER

From: Thomas Gleixner <tglx@...utronix.de>

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 a RT aware wake_q derivative.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 include/linux/sched/wake_q.h |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)
---
--- a/include/linux/sched/wake_q.h
+++ b/include/linux/sched/wake_q.h
@@ -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)
 {