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From 9df803c28bb8ccb2588c0ccaf857b9e673175fed Mon Sep 17 00:00:00 2001
From: Con Kolivas <kernel@kolivas.org>
Date: Fri, 4 Nov 2016 09:25:54 +1100
Subject: [PATCH 06/16] Convert msleep to use hrtimers when active.

---
 kernel/time/timer.c | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index dd4d1b193286..c68cb9307f64 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1884,7 +1884,19 @@ void __init init_timers(void)
  */
 void msleep(unsigned int msecs)
 {
-	unsigned long timeout = msecs_to_jiffies(msecs) + 1;
+	int jiffs = msecs_to_jiffies(msecs);
+	unsigned long timeout;
+
+	/*
+	 * Use high resolution timers where the resolution of tick based
+	 * timers is inadequate.
+	 */
+	if (jiffs < 5 && hrtimer_resolution < NSEC_PER_SEC / HZ) {
+		while (msecs)
+			msecs = schedule_msec_hrtimeout_uninterruptible(msecs);
+		return;
+	}
+	timeout = msecs_to_jiffies(msecs) + 1;
 
 	while (timeout)
 		timeout = schedule_timeout_uninterruptible(timeout);
@@ -1898,7 +1910,15 @@ EXPORT_SYMBOL(msleep);
  */
 unsigned long msleep_interruptible(unsigned int msecs)
 {
-	unsigned long timeout = msecs_to_jiffies(msecs) + 1;
+	int jiffs = msecs_to_jiffies(msecs);
+	unsigned long timeout;
+
+	if (jiffs < 5 && hrtimer_resolution < NSEC_PER_SEC / HZ) {
+		while (msecs && !signal_pending(current))
+			msecs = schedule_msec_hrtimeout_interruptible(msecs);
+		return msecs;
+	}
+	timeout = msecs_to_jiffies(msecs) + 1;
 
 	while (timeout && !signal_pending(current))
 		timeout = schedule_timeout_interruptible(timeout);
-- 
2.11.0