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| author | Thomas Gleixner <tglx@linutronix.de> | 2015-07-07 16:45:15 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2015-07-07 18:46:48 +0200 |
| commit | 0cc5281aa592d0020868f6ccaed359b4ad7b2684 (patch) | |
| tree | 0db9c9a0a36bdb4bd6c264d99b301e9892b2a3f7 /kernel | |
| parent | d33257264b0267a8fd20f6717abbb484c9e21130 (diff) | |
| download | linux-0cc5281aa592d0020868f6ccaed359b4ad7b2684.tar.gz linux-0cc5281aa592d0020868f6ccaed359b4ad7b2684.tar.bz2 linux-0cc5281aa592d0020868f6ccaed359b4ad7b2684.zip | |
tick/broadcast: Return busy when IPI is pending
Tell the idle code not to go deep if the broadcast IPI is about to
arrive.
[ Split out from a larger combo patch ]
Tested-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Suzuki Poulose <Suzuki.Poulose@arm.com>
Cc: Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>
Cc: Catalin Marinas <Catalin.Marinas@arm.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1507070929360.3916@nanos
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/time/tick-broadcast.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c index da7b40fdf6d0..70b47bc928b9 100644 --- a/kernel/time/tick-broadcast.c +++ b/kernel/time/tick-broadcast.c @@ -725,11 +725,15 @@ int __tick_broadcast_oneshot_control(enum tick_broadcast_state state) * if the cpu local event is earlier than the * broadcast event. If the current CPU is in * the force mask, then we are going to be - * woken by the IPI right away. + * woken by the IPI right away; we return + * busy, so the CPU does not try to go deep + * idle. */ - if (!cpumask_test_cpu(cpu, tick_broadcast_force_mask) && - dev->next_event.tv64 < bc->next_event.tv64) + if (cpumask_test_cpu(cpu, tick_broadcast_force_mask)) { + ret = -EBUSY; + } else if (dev->next_event.tv64 < bc->next_event.tv64) { tick_broadcast_set_event(bc, cpu, dev->next_event); + } } /* * If the current CPU owns the hrtimer broadcast |