[PATCH 1/6] delay: add poll_event_interruptible

[Michal Suchanek]

Add convenience macro for polling an event that does not have a
waitqueue.

Signed-off-by: Michal Suchanek <msuchanek@xxxxxxx>
---
 include/linux/delay.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/delay.h b/include/linux/delay.h
index b78bab4395d8..3ae9fa395628 100644
--- a/include/linux/delay.h
+++ b/include/linux/delay.h
@@ -64,4 +64,16 @@ static inline void ssleep(unsigned int seconds)
 	msleep(seconds * 1000);
 }
 
+#define poll_event_interruptible(event, interval) ({ \
+	int ret = 0; \
+	while (!(event)) { \
+		if (signal_pending(current)) { \
+			ret = -ERESTARTSYS; \
+			break; \
+		} \
+		msleep_interruptible(interval); \
+	} \
+	ret; \
+})
+
 #endif /* defined(_LINUX_DELAY_H) */
-- 
2.13.6