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@lists.linux-m68k.org, dhowells@redhat.com
Subject: [patch 3/4] posix-timers: Handle relative timers with CONFIG_TIME_LOW_RES proper
Date: Thu, 14 Jan 2016 16:54:47 -0000 [thread overview]
Message-ID: <20160114164159.450510905@linutronix.de> (raw)
In-Reply-To: 20160114163744.582215466@linutronix.de
[-- Attachment #1: posix-timers--Handle-relative-timers-with-CONFIG_TIME_LOW_RES-proper.patch --]
[-- Type: text/plain, Size: 897 bytes --]
As Helge reported for timerfd we have the same issue in posix timers. 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/posix-timers.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -760,7 +760,7 @@ common_timer_get(struct k_itimer *timr,
(timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE))
timr->it_overrun += (unsigned int) hrtimer_forward(timer, now, iv);
- remaining = ktime_sub(hrtimer_get_expires(timer), now);
+ remaining = __hrtimer_expires_remaining_adjusted(timer, now);
/* Return 0 only, when the timer is expired and not pending */
if (remaining.tv64 <= 0) {
/*
next prev parent reply other threads:[~2016-01-14 16:54 UTC|newest]
Thread overview: 6+ 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 ` [patch 1/4] hrtimer: Handle remaining time proper for TIME_LOW_RES Thomas Gleixner
2016-01-16 18:36 ` Helge Deller
2016-01-14 16:54 ` [patch 2/4] timerfd: Handle relative timers with CONFIG_TIME_LOW_RES proper Thomas Gleixner
2016-01-14 16:54 ` Thomas Gleixner [this message]
2016-01-14 16:54 ` [patch 4/4] itimers: " Thomas Gleixner
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