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[PATCH 3.2 04/67] posix-timers: Handle relative timers with CONFIG_TIME_LOW_RES proper

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3.2.78-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Thomas Gleixner <tglx@linutronix.de>

commit 572c39172684c3711e4a03c9a7380067e2b0661c upstream.

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>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Helge Deller <deller@gmx.de>
Cc: John Stultz <john.stultz@linaro.org>
Cc: linux-m68k@lists.linux-m68k.org
Cc: dhowells@redhat.com
Link: http://lkml.kernel.org/r/20160114164159.450510905@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 kernel/posix-timers.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -706,7 +706,7 @@ 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) {
 		/*

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[PATCH 3.2 00/67] 3.2.78-rc1 review Ben Hutchings <ben@decadent.org.uk> - 2016-02-23 23:10 +0100
  [PATCH 3.2 10/67] sctp: allow setting SCTP_SACK_IMMEDIATELY by  the application Ben Hutchings <ben@decadent.org.uk> - 2016-02-23 23:10 +0100
  [PATCH 3.2 14/67] USB: serial: option: Adding support for Telit LE922 Ben Hutchings <ben@decadent.org.uk> - 2016-02-23 23:10 +0100
  [PATCH 3.2 06/67] usb: cdc-acm: send zero packet for intel 7260 modem Ben Hutchings <ben@decadent.org.uk> - 2016-02-23 23:10 +0100
  [PATCH 3.2 02/67] hrtimer: Handle remaining time proper for  TIME_LOW_RES Ben Hutchings <ben@decadent.org.uk> - 2016-02-23 23:10 +0100
  [PATCH 3.2 52/67] ALSA: dummy: Implement timer backend switching  more safely Ben Hutchings <ben@decadent.org.uk> - 2016-02-23 23:10 +0100
  [PATCH 3.2 37/67] ALSA: rawmidi: Make snd_rawmidi_transmit()  race-free Ben Hutchings <ben@decadent.org.uk> - 2016-02-23 23:10 +0100
  [PATCH 3.2 01/67] KVM: vmx: fix MPX detection Ben Hutchings <ben@decadent.org.uk> - 2016-02-23 23:10 +0100
  [PATCH 3.2 40/67] Revert "xhci: don't finish a TD if we get a  short-transfer event mid TD" Ben Hutchings <ben@decadent.org.uk> - 2016-02-23 23:10 +0100
  [PATCH 3.2 38/67] ALSA: rawmidi: Fix race at copying & updating  the position Ben Hutchings <ben@decadent.org.uk> - 2016-02-23 23:10 +0100
  [PATCH 3.2 41/67] usb: xhci: apply XHCI_PME_STUCK_QUIRK to Intel  Broxton-M platforms Ben Hutchings <ben@decadent.org.uk> - 2016-02-23 23:10 +0100
  [PATCH 3.2 08/67] af_unix: fix struct pid memory leak Ben Hutchings <ben@decadent.org.uk> - 2016-02-23 23:10 +0100
  [PATCH 3.2 04/67] posix-timers: Handle relative timers with  CONFIG_TIME_LOW_RES proper Ben Hutchings <ben@decadent.org.uk> - 2016-02-23 23:10 +0100
  [PATCH 3.2 45/67] [media] saa7134-alsa: Only frees registered  sound cards Ben Hutchings <ben@decadent.org.uk> - 2016-02-23 23:10 +0100
  [PATCH 3.2 58/67] ahci: Intel DNV device IDs SATA Ben Hutchings <ben@decadent.org.uk> - 2016-02-23 23:10 +0100
  [PATCH 3.2 07/67] cdc-acm:exclude Samsung phone 04e8:685d Ben Hutchings <ben@decadent.org.uk> - 2016-02-23 23:10 +0100
  [PATCH 3.2 05/67] itimers: Handle relative timers with  CONFIG_TIME_LOW_RES proper Ben Hutchings <ben@decadent.org.uk> - 2016-02-23 23:10 +0100
  [PATCH 3.2 46/67] scsi_dh_rdac: always retry MODE SELECT on  command lock violation Ben Hutchings <ben@decadent.org.uk> - 2016-02-23 23:10 +0100
  Re: [PATCH 3.2 00/67] 3.2.78-rc1 review Guenter Roeck <linux@roeck-us.net> - 2016-02-24 03:50 +0100
    Re: [PATCH 3.2 00/67] 3.2.78-rc1 review Ben Hutchings <ben@decadent.org.uk> - 2016-02-24 15:50 +0100

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