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From 5da7d1778b96c514394334c92de9b3d8d71f4a29 Mon Sep 17 00:00:00 2001
From: Con Kolivas <kernel@kolivas.org>
Date: Sat, 5 Nov 2016 09:27:36 +1100
Subject: [PATCH 05/16] Special case calls of schedule_timeout(1) to use the
min hrtimeout of 1ms, working around low Hz resolutions.
---
kernel/time/timer.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 9c18e16059a3..dd4d1b193286 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1741,6 +1741,19 @@ signed long __sched schedule_timeout(signed long timeout)
expire = timeout + jiffies;
+#ifdef CONFIG_HIGH_RES_TIMERS
+ if (timeout == 1 && hrtimer_resolution < NSEC_PER_SEC / HZ) {
+ /*
+ * Special case 1 as being a request for the minimum timeout
+ * and use highres timers to timeout after 1ms to workaround
+ * the granularity of low Hz tick timers.
+ */
+ if (!schedule_min_hrtimeout())
+ return 0;
+ goto out_timeout;
+ }
+#endif
+
setup_timer_on_stack(&timer, process_timeout, (unsigned long)current);
__mod_timer(&timer, expire, false);
schedule();
@@ -1748,10 +1761,10 @@ signed long __sched schedule_timeout(signed long timeout)
/* Remove the timer from the object tracker */
destroy_timer_on_stack(&timer);
-
+out_timeout:
timeout = expire - jiffies;
- out:
+out:
return timeout < 0 ? 0 : timeout;
}
EXPORT_SYMBOL(schedule_timeout);
--
2.11.0
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