Patch "itimers: Handle relative timers with CONFIG_TIME_LOW_RES proper" has been added to the 4.4-stable tree

Patch "itimers: Handle relative timers with CONFIG_TIME_LOW_RES proper" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    itimers: Handle relative timers with CONFIG_TIME_LOW_RES proper

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     itimers-handle-relative-timers-with-config_time_low_res-proper.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 51cbb5242a41700a3f250ecfb48dcfb7e4375ea4 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 14 Jan 2016 16:54:48 +0000
Subject: itimers: Handle relative timers with CONFIG_TIME_LOW_RES proper

From: Thomas Gleixner <tglx@linutronix.de>

commit 51cbb5242a41700a3f250ecfb48dcfb7e4375ea4 upstream.

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>
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/20160114164159.528222587@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 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


Patches currently in stable-queue which might be from tglx@linutronix.de are

queue-4.4/itimers-handle-relative-timers-with-config_time_low_res-proper.patch
queue-4.4/futex-drop-refcount-if-requeue_pi-acquired-the-rtmutex.patch
queue-4.4/x86-mm-pat-avoid-truncation-when-converting-cpa-numpages-to-address.patch
queue-4.4/x86-uaccess-64-handle-the-caching-of-4-byte-nocache-copies-properly-in-__copy_user_nocache.patch
queue-4.4/timerfd-handle-relative-timers-with-config_time_low_res-proper.patch
queue-4.4/posix-timers-handle-relative-timers-with-config_time_low_res-proper.patch
queue-4.4/x86-mm-fix-vmalloc_fault-to-handle-large-pages-properly.patch
queue-4.4/x86-mm-fix-types-used-in-pgprot-cacheability-flags-translations.patch
queue-4.4/x86-uaccess-64-make-the-__copy_user_nocache-assembly-code-more-readable.patch