linux-kernel - [PATCH 07/15] Add wait_var_event

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Message-ID: <155793758837.31671.13765813674309502991.stgit@warthog.procyon.org.uk>
Date:   Wed, 15 May 2019 17:26:28 +0100
From:   David Howells <dhowells@...hat.com>
To:     linux-afs@...ts.infradead.org
Cc:     Peter Zijlstra <peterz@...radead.org>, dhowells@...hat.com,
        linux-kernel@...r.kernel.org
Subject: [PATCH 07/15] Add wait_var_event_interruptible()

Add wait_var_event_interruptible() to allow interruptible waits for events.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Peter Zijlstra <peterz@...radead.org>
---

 include/linux/wait_bit.h |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/wait_bit.h b/include/linux/wait_bit.h
index 2b0072fa5e92..7dec36aecbd9 100644
--- a/include/linux/wait_bit.h
+++ b/include/linux/wait_bit.h
@@ -305,6 +305,19 @@ do {									\
 	__ret;								\
 })
 
+#define __wait_var_event_interruptible(var, condition)			\
+	___wait_var_event(var, condition, TASK_INTERRUPTIBLE, 0, 0,	\
+			  schedule())
+
+#define wait_var_event_interruptible(var, condition)			\
+({									\
+	int __ret = 0;							\
+	might_sleep();							\
+	if (!(condition))						\
+		__ret = __wait_var_event_interruptible(var, condition);	\
+	__ret;								\
+})
+
 /**
  * clear_and_wake_up_bit - clear a bit and wake up anyone waiting on that bit
  *