linux-kernel - [PATCH 4/6] sched/swait: Add swait_event_lock

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Date:   Thu, 13 Jun 2019 16:50:25 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     Tejun Heo <tj@...nel.org>, Lai Jiangshan <jiangshanlai@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH 4/6] sched/swait: Add swait_event_lock_irq()

The swait_event_lock_irq() is inspired by wait_event_lock_irq(). This is
required by the workqueue code once it switches to swait.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 include/linux/swait.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/include/linux/swait.h b/include/linux/swait.h
index 73e06e9986d4b..12612823c2cb1 100644
--- a/include/linux/swait.h
+++ b/include/linux/swait.h
@@ -297,4 +297,18 @@ do {									\
 	__ret;								\
 })
 
+#define __swait_event_lock_irq(wq, condition, lock, cmd)		\
+	___swait_event(wq, condition, TASK_UNINTERRUPTIBLE, 0,		\
+		       raw_spin_unlock_irq(&lock);			\
+		       cmd;						\
+		       schedule();					\
+		       raw_spin_lock_irq(&lock))
+
+#define swait_event_lock_irq(wq_head, condition, lock)			\
+	do {								\
+		if (condition)						\
+			break;						\
+		__swait_event_lock_irq(wq_head, condition, lock, );	\
+	} while (0)
+
 #endif /* _LINUX_SWAIT_H */
-- 
2.20.1