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clockevents: Move C3 stop test outside lock
Avoid taking broadcast_lock in the idle path for systems where the timer doesn't stop in C3. [ tglx: Removed the stale label and added comment ] Signed-off-by: Andi Kleen <ak@linux.intel.com> Cc: Dave Kleikamp <dkleikamp@gmail.com> Cc: Chris Mason <chris.mason@oracle.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Tim Chen <tim.c.chen@linux.intel.com> Cc: lenb@kernel.org Cc: paulmck@us.ibm.com Link: http://lkml.kernel.org/r/%3C20110504234806.GF2925%40one.firstfloor.org%3E Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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parent
179eb03268
commit
7372b0b122
1 changed files with 9 additions and 7 deletions
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@ -456,23 +456,27 @@ void tick_broadcast_oneshot_control(unsigned long reason)
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unsigned long flags;
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int cpu;
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raw_spin_lock_irqsave(&tick_broadcast_lock, flags);
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/*
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* Periodic mode does not care about the enter/exit of power
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* states
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*/
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if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC)
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goto out;
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return;
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bc = tick_broadcast_device.evtdev;
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/*
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* We are called with preemtion disabled from the depth of the
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* idle code, so we can't be moved away.
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*/
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cpu = smp_processor_id();
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td = &per_cpu(tick_cpu_device, cpu);
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dev = td->evtdev;
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if (!(dev->features & CLOCK_EVT_FEAT_C3STOP))
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goto out;
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return;
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bc = tick_broadcast_device.evtdev;
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raw_spin_lock_irqsave(&tick_broadcast_lock, flags);
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if (reason == CLOCK_EVT_NOTIFY_BROADCAST_ENTER) {
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if (!cpumask_test_cpu(cpu, tick_get_broadcast_oneshot_mask())) {
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cpumask_set_cpu(cpu, tick_get_broadcast_oneshot_mask());
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@ -489,8 +493,6 @@ void tick_broadcast_oneshot_control(unsigned long reason)
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tick_program_event(dev->next_event, 1);
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}
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}
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out:
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raw_spin_unlock_irqrestore(&tick_broadcast_lock, flags);
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}
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