From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Gleixner Subject: [patch 3/4] posix-timers: Handle relative timers with CONFIG_TIME_LOW_RES proper Date: Thu, 14 Jan 2016 16:54:47 -0000 Message-ID: <20160114164159.450510905@linutronix.de> References: <20160114163744.582215466@linutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Return-path: Content-Disposition: inline; filename=posix-timers--Handle-relative-timers-with-CONFIG_TIME_LOW_RES-proper.patch Sender: linux-m68k-owner@vger.kernel.org List-Id: linux-m68k@vger.kernel.org To: LKML Cc: Ingo Molnar , Peter Zijlstra , Helge Deller , John Stultz , linux-m68k@lists.linux-m68k.org, dhowells@redhat.com 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 --- 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) { /*