lkml.org 
[lkml]   [2012]   [Jul]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 4/6] hrtimer: Move lock held region in hrtimer_interrupt()
    Date
    From: Thomas Gleixner <tglx@linutronix.de>

    We need to update the base offsets from this code and we need to do
    that under base->lock. Move the lock held region around the
    ktime_get() calls. The ktime_get() calls are going to be replaced with
    a function which gets the time and the offsets atomically.

    CC: Ingo Molnar <mingo@kernel.org>
    CC: Peter Zijlstra <a.p.zijlstra@chello.nl>
    CC: Prarit Bhargava <prarit@redhat.com>
    CC: Thomas Gleixner <tglx@linutronix.de>
    CC: stable@vger.kernel.org
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Signed-off-by: John Stultz <johnstul@us.ibm.com>
    ---
    kernel/hrtimer.c | 5 +++--
    1 file changed, 3 insertions(+), 2 deletions(-)

    diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
    index 7c20cb8..14a260a 100644
    --- a/kernel/hrtimer.c
    +++ b/kernel/hrtimer.c
    @@ -1263,11 +1263,10 @@ void hrtimer_interrupt(struct clock_event_device *dev)
    cpu_base->nr_events++;
    dev->next_event.tv64 = KTIME_MAX;

    + raw_spin_lock(&cpu_base->lock);
    entry_time = now = ktime_get();
    retry:
    expires_next.tv64 = KTIME_MAX;
    -
    - raw_spin_lock(&cpu_base->lock);
    /*
    * We set expires_next to KTIME_MAX here with cpu_base->lock
    * held to prevent that a timer is enqueued in our queue via
    @@ -1344,6 +1343,7 @@ retry:
    * interrupt routine. We give it 3 attempts to avoid
    * overreacting on some spurious event.
    */
    + raw_spin_lock(&cpu_base->lock);
    now = ktime_get();
    cpu_base->nr_retries++;
    if (++retries < 3)
    @@ -1356,6 +1356,7 @@ retry:
    */
    cpu_base->nr_hangs++;
    cpu_base->hang_detected = 1;
    + raw_spin_unlock(&cpu_base->lock);
    delta = ktime_sub(now, entry_time);
    if (delta.tv64 > cpu_base->max_hang_time.tv64)
    cpu_base->max_hang_time = delta;
    --
    1.7.9.5


    \
     
     \ /
      Last update: 2012-07-11 01:21    [W:0.026 / U:32.936 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site