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From ea1ace768425220e605f405f36560a4a6d2b0859 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 | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 7dcadf9cd865..212931d29762 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1892,6 +1892,18 @@ 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
timer.task = current;
timer_setup_on_stack(&timer.timer, process_timeout, 0);
__mod_timer(&timer.timer, expire, 0);
@@ -1900,10 +1912,10 @@ signed long __sched schedule_timeout(signed long timeout)
/* Remove the timer from the object tracker */
destroy_timer_on_stack(&timer.timer);
-
+out_timeout:
timeout = expire - jiffies;
- out:
+out:
return timeout < 0 ? 0 : timeout;
}
EXPORT_SYMBOL(schedule_timeout);
--
2.20.1
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