linux-kernel - Re: [ANNOUNCE] v4.11.12-rt13

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Date:   Tue, 10 Oct 2017 18:47:49 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Mike Galbraith <efault@....de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [ANNOUNCE] v4.11.12-rt13

On 2017-10-10 18:24:55 [+0200], To Mike Galbraith wrote:
> > homer:..debug/tracing # time chrt -f 1 /usr/local/ltp/conformance/interfaces/clock_settime/clock_settime_8-1.run-test
> > Ended too late.  1507351636 >> 1507351634
> > Test FAILED
> > 
> > real    0m7.002s
> > user    0m0.000s
> > sys     0m0.002s
> 
> As per POSIX we should sleep only 5 secs despite the CLOCK_REALTIME
> change. In RT case however we sleep 7 so we somehow account it which is
> wrong.

This should cure it:

diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -1258,6 +1258,8 @@ static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
 			clock_id = CLOCK_MONOTONIC;
 		else if (clock_id == CLOCK_REALTIME_SOFT)
 			clock_id = CLOCK_MONOTONIC_SOFT;
+		else if (clock_id == CLOCK_REALTIME_HARD)
+			clock_id = CLOCK_MONOTONIC;
 	}
 
 	base = hrtimer_clockid_to_base(clock_id);
 
Sebastian