Commit-ID: 77b0d60c5adf39c74039e2142a1d3cd1e4d53799 Gitweb: http://git.kernel.org/tip/77b0d60c5adf39c74039e2142a1d3cd1e4d53799 Author: Suresh Siddha <suresh.b.siddha@xxxxxxxxx> AuthorDate: Fri, 4 Nov 2011 17:18:21 -0700 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitDate: Wed, 15 Feb 2012 15:23:09 +0100 clockevents: Leave the broadcast device in shutdown mode when not needed Platforms with Always Running APIC Timer doesn't use the broadcast timer but the kernel is leaving the broadcast timer (HPET in this case) in oneshot mode. On these platforms, before the switch to oneshot mode, broadcast device is actually in shutdown mode. Code checks for empty tick_broadcast_mask and avoids going into the periodic mode. During switch to oneshot mode, add the same tick_broadcast_mask checks in the tick_broadcast_switch_to_oneshot() and avoid the broadcast device going into the oneshot mode. Signed-off-by: Suresh Siddha <suresh.b.siddha@xxxxxxxxx> Cc: john stultz <johnstul@xxxxxxxxxx> Cc: venki@xxxxxxxxxx Link: http://lkml.kernel.org/r/1320452301.15071.16.camel@xxxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> --- kernel/time/tick-broadcast.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c index fd4a7b1..e883f57 100644 --- a/kernel/time/tick-broadcast.c +++ b/kernel/time/tick-broadcast.c @@ -575,11 +575,15 @@ void tick_broadcast_switch_to_oneshot(void) unsigned long flags; raw_spin_lock_irqsave(&tick_broadcast_lock, flags); + if (cpumask_empty(tick_get_broadcast_mask())) + goto end; tick_broadcast_device.mode = TICKDEV_MODE_ONESHOT; bc = tick_broadcast_device.evtdev; if (bc) tick_broadcast_setup_oneshot(bc); + +end: raw_spin_unlock_irqrestore(&tick_broadcast_lock, flags); } -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html