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authorThomas Gleixner <tglx@linutronix.de>2015-07-07 16:38:11 +0200
committerThomas Gleixner <tglx@linutronix.de>2015-07-07 18:46:47 +0200
commite3ac79e087ffe8a1f953ed44a74acf7616cb0b25 (patch)
tree42b0acc684b4fbd4dccf1586a27219109733bc25 /kernel/time
parentb78f3f3c898c824bf56ab55cfa59fc72be49c349 (diff)
downloadlinux-e3ac79e087ffe8a1f953ed44a74acf7616cb0b25.tar.bz2
tick/broadcast: Move the check for periodic mode inside state handling
We need to check more than the periodic mode for proper operation in all runtime combinations. To avoid code duplication move the check into the enter state handling. No functional change. [ Split out from a larger combo patch ] Reported-and-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/time')
-rw-r--r--kernel/time/tick-broadcast.c22
1 files changed, 8 insertions, 14 deletions
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index fad3f789beec..83aa92e87a85 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -688,7 +688,6 @@ static void broadcast_shutdown_local(struct clock_event_device *bc,
int __tick_broadcast_oneshot_control(enum tick_broadcast_state state)
{
struct clock_event_device *bc, *dev;
- struct tick_device *td;
int cpu, ret = 0;
ktime_t now;
@@ -699,25 +698,20 @@ int __tick_broadcast_oneshot_control(enum tick_broadcast_state state)
if (!tick_broadcast_device.evtdev)
return -EBUSY;
- /*
- * Periodic mode does not care about the enter/exit of power
- * states
- */
- if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC)
- return 0;
-
- /*
- * We are called with preemtion disabled from the depth of the
- * idle code, so we can't be moved away.
- */
- td = this_cpu_ptr(&tick_cpu_device);
- dev = td->evtdev;
+ dev = this_cpu_ptr(&tick_cpu_device)->evtdev;
raw_spin_lock(&tick_broadcast_lock);
bc = tick_broadcast_device.evtdev;
cpu = smp_processor_id();
if (state == TICK_BROADCAST_ENTER) {
+ /*
+ * If the broadcast device is in periodic mode, we
+ * return.
+ */
+ if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC)
+ goto out;
+
if (!cpumask_test_and_set_cpu(cpu, tick_broadcast_oneshot_mask)) {
WARN_ON_ONCE(cpumask_test_cpu(cpu, tick_broadcast_pending_mask));
broadcast_shutdown_local(bc, dev);