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From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Helge Deller <deller@gmx.de>,
	John Stultz <john.stultz@linaro.org>,
	linux-m68k@vger.kernel.org, dhowells@redhat.com
Subject: [patch 4/4] itimers: Handle relative timers with CONFIG_TIME_LOW_RES proper
Date: Thu, 14 Jan 2016 16:54:48 -0000	[thread overview]
Message-ID: <20160114164159.528222587@linutronix.de> (raw)
In-Reply-To: <20160114163744.582215466@linutronix.de>

[-- Attachment #1: itimers--Handle-relative-timers-with-CONFIG_TIME_LOW_RES-proper.patch --]
[-- Type: text/plain, Size: 710 bytes --]

As Helge reported for timerfd we have the same issue in itimers. We return
remaining time larger than the programmed relative time to user space in case
of CONFIG_TIME_LOW_RES=y. Use the proper function to adjust the extra time
added in hrtimer_start_range_ns().

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 kernel/time/itimer.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/time/itimer.c
+++ b/kernel/time/itimer.c
@@ -26,7 +26,7 @@
  */
 static struct timeval itimer_get_remtime(struct hrtimer *timer)
 {
-	ktime_t rem = hrtimer_get_remaining(timer);
+	ktime_t rem = __hrtimer_get_remaining(timer, true);
 
 	/*
 	 * Racy but safe: if the itimer expires after the above

  parent reply	other threads:[~2016-01-14 16:56 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-14 16:54 [patch 0/4] hrtimers: Handle remaining time correctly for CONFIG_TIME_LOW_RES=y Thomas Gleixner
2016-01-14 16:54 ` Thomas Gleixner
2016-01-14 16:54 ` [patch 1/4] hrtimer: Handle remaining time proper for TIME_LOW_RES Thomas Gleixner
2016-01-14 16:54   ` Thomas Gleixner
2016-01-16 18:36   ` Helge Deller
2016-01-16 18:36     ` Helge Deller
2016-01-16 18:36   ` Helge Deller
2016-01-17 10:42   ` [tip:timers/urgent] " tip-bot for Thomas Gleixner
2016-01-14 16:54 ` [patch 2/4] timerfd: Handle relative timers with CONFIG_TIME_LOW_RES proper Thomas Gleixner
2016-01-17 10:43   ` [tip:timers/urgent] " tip-bot for Thomas Gleixner
2016-01-14 16:54 ` [patch 2/4] " Thomas Gleixner
2016-01-14 16:54 ` [patch 3/4] posix-timers: " Thomas Gleixner
2016-01-14 16:54   ` Thomas Gleixner
2016-01-17 10:43   ` [tip:timers/urgent] " tip-bot for Thomas Gleixner
2016-01-14 16:54 ` [patch 4/4] itimers: " Thomas Gleixner
2016-01-14 16:54 ` Thomas Gleixner [this message]
2016-01-17 10:43   ` [tip:timers/urgent] " tip-bot for Thomas Gleixner

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