arm/bL_switcher: Kill tick suspend hackery

Use the new tick_suspend/resume_local() and get rid of the
homebrewn implementation of these in the ARM bL switcher.  The
check for the cpumask is completely pointless.  There is no harm
to suspend a per cpu tick device unconditionally.  If that's a
real issue then we fix it proper at the core level and not with
some completely undocumented hacks in some random core code.

Move the tick internals to the core code, now that this nuisance
is gone.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[ rjw: Rebase, changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Link: http://lkml.kernel.org/r/1655112.Ws17YsMfN7@vostro.rjw.lan
Signed-off-by: Ingo Molnar <mingo@kernel.org>

3 files changed, 16 insertions, 1 deletions

diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index da796d65d1fb..e28ba5c044c5 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -380,7 +380,7 @@ void tick_shutdown(unsigned int *cpup)
  *
  * No locks required. Nothing can change the per cpu device.
  */
-static void tick_suspend_local(void)
+void tick_suspend_local(void)
 {
         struct tick_device *td = this_cpu_ptr(&tick_cpu_device);
 
diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h
index 6ba7bce732f2..5fc2dafabd58 100644
--- a/kernel/time/tick-internal.h
+++ b/kernel/time/tick-internal.h
@@ -28,6 +28,7 @@ extern bool tick_check_replacement(struct clock_event_device *curdev,
                                    struct clock_event_device *newdev);
 extern void tick_install_replacement(struct clock_event_device *dev);
 extern int tick_is_oneshot_available(void);
+extern struct tick_device *tick_get_device(int cpu);
 
 extern int clockevents_tick_resume(struct clock_event_device *dev);
 /* Check, if the device is functional or a dummy for broadcast */
@@ -39,6 +40,10 @@ static inline int tick_device_is_functional(struct clock_event_device *dev)
 extern void clockevents_shutdown(struct clock_event_device *dev);
 extern void clockevents_exchange_device(struct clock_event_device *old,
                                         struct clock_event_device *new);
+extern void clockevents_set_state(struct clock_event_device *dev,
+                                 enum clock_event_state state);
+extern int clockevents_program_event(struct clock_event_device *dev,
+                                     ktime_t expires, bool force);
 extern void clockevents_handle_noop(struct clock_event_device *dev);
 extern int __clockevents_update_freq(struct clock_event_device *dev, u32 freq);
 extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt);
diff --git a/kernel/time/tick-sched.h b/kernel/time/tick-sched.h
index 930743249127..28b5da3e1a17 100644
--- a/kernel/time/tick-sched.h
+++ b/kernel/time/tick-sched.h
@@ -3,6 +3,16 @@
 
 #include <linux/hrtimer.h>
 
+enum tick_device_mode {
+        TICKDEV_MODE_PERIODIC,
+        TICKDEV_MODE_ONESHOT,
+};
+
+struct tick_device {
+        struct clock_event_device *evtdev;
+        enum tick_device_mode mode;
+};
+
 enum tick_nohz_mode {
         NOHZ_MODE_INACTIVE,
         NOHZ_MODE_LOWRES,