diff options
| author | Viresh Kumar <viresh.kumar@linaro.org> | 2014-05-12 13:42:29 +0530 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2014-05-12 10:47:39 +0200 |
| commit | 84ea7fe37908254c3bd90910921f6e1045c1747a (patch) | |
| tree | 8ff89c82bd3db23a9e260a8458af7fe053a701b1 /kernel/hrtimer.c | |
| parent | d6d211db37e75de2ddc3a4f979038c40df7cc79c (diff) | |
| download | lwn-84ea7fe37908254c3bd90910921f6e1045c1747a.tar.gz lwn-84ea7fe37908254c3bd90910921f6e1045c1747a.zip | |
hrtimer: Set expiry time before switch_hrtimer_base()
switch_hrtimer_base() calls hrtimer_check_target() which ensures that
we do not migrate a timer to a remote cpu if the timer expires before
the current programmed expiry time on that remote cpu.
But __hrtimer_start_range_ns() calls switch_hrtimer_base() before the
new expiry time is set. So the sanity check in hrtimer_check_target()
is operating on stale or even uninitialized data.
Update expiry time before calling switch_hrtimer_base().
[ tglx: Rewrote changelog once again ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: linaro-kernel@lists.linaro.org
Cc: linaro-networking@linaro.org
Cc: fweisbec@gmail.com
Cc: arvind.chauhan@arm.com
Link: http://lkml.kernel.org/r/81999e148745fc51bbcd0615823fbab9b2e87e23.1399882253.git.viresh.kumar@linaro.org
Cc: stable@vger.kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/hrtimer.c')
| -rw-r--r-- | kernel/hrtimer.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c index 6b715c0af1b1..e0501fe7140d 100644 --- a/kernel/hrtimer.c +++ b/kernel/hrtimer.c @@ -990,11 +990,8 @@ int __hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, /* Remove an active timer from the queue: */ ret = remove_hrtimer(timer, base); - /* Switch the timer base, if necessary: */ - new_base = switch_hrtimer_base(timer, base, mode & HRTIMER_MODE_PINNED); - if (mode & HRTIMER_MODE_REL) { - tim = ktime_add_safe(tim, new_base->get_time()); + tim = ktime_add_safe(tim, base->get_time()); /* * CONFIG_TIME_LOW_RES is a temporary way for architectures * to signal that they simply return xtime in @@ -1009,6 +1006,9 @@ int __hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, hrtimer_set_expires_range_ns(timer, tim, delta_ns); + /* Switch the timer base, if necessary: */ + new_base = switch_hrtimer_base(timer, base, mode & HRTIMER_MODE_PINNED); + timer_stats_hrtimer_set_start_info(timer); leftmost = enqueue_hrtimer(timer, new_base); |