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From b713b0c571fa869fec376742be0e9c217ab38dab Mon Sep 17 00:00:00 2001
From: Con Kolivas <kernel@kolivas.org>
Date: Fri, 4 Nov 2016 09:25:54 +1100
Subject: [PATCH 07/16] 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 98803a47491c..3ab277ba0f44 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1964,7 +1964,19 @@ 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);
@@ -1978,7 +1990,15 @@ 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);
--
2.17.1
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