tick: Further simplify tick-internal.h

Move the broadcasting related section to the GENERIC_CLOCKEVENTS=y
section - this also solves build failures on architectures that
don't use generic clockevents yet.

Also standardize include file style to make it easier to read, and
use nesting depth aware preprocessor directives to make future merges
easier.

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: NIngo Molnar <mingo@kernel.org>

kernel/time/tick-internal.h

@@ -9,8 +9,8 @@
 
 #ifdef CONFIG_GENERIC_CLOCKEVENTS
 
-#define TICK_DO_TIMER_NONE	-1
-#define TICK_DO_TIMER_BOOT	-2
+# define TICK_DO_TIMER_NONE	-1
+# define TICK_DO_TIMER_BOOT	-2
 
 DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
 extern ktime_t tick_next_period;
@@ -47,41 +47,9 @@ extern int clockevents_program_event(struct clock_event_device *dev,
 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);
-#else
-static inline void tick_suspend(void) { }
-static inline void tick_resume(void) { }
-#endif /* GENERIC_CLOCKEVENTS */
-
-/* Oneshot related functions */
-#ifdef CONFIG_TICK_ONESHOT
-extern void tick_setup_oneshot(struct clock_event_device *newdev,
-			       void (*handler)(struct clock_event_device *),
-			       ktime_t nextevt);
-extern int tick_program_event(ktime_t expires, int force);
-extern void tick_oneshot_notify(void);
-extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
-extern void tick_resume_oneshot(void);
-static inline bool tick_oneshot_possible(void) { return true; }
-extern int tick_oneshot_mode_active(void);
-extern void tick_clock_notify(void);
-extern int tick_check_oneshot_change(int allow_nohz);
-extern int tick_init_highres(void);
-#else /* !ONESHOT */
-static inline
-void tick_setup_oneshot(struct clock_event_device *newdev,
-			void (*handler)(struct clock_event_device *),
-			ktime_t nextevt) { BUG(); }
-static inline void tick_resume_oneshot(void) { BUG(); }
-static inline int tick_program_event(ktime_t expires, int force) { return 0; }
-static inline void tick_oneshot_notify(void) { }
-static inline bool tick_oneshot_possible(void) { return false; }
-static inline int tick_oneshot_mode_active(void) { return 0; }
-static inline void tick_clock_notify(void) { }
-static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
-#endif /* !TICK_ONESHOT */
 
 /* Broadcasting support */
-#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
+# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
 extern void tick_install_broadcast_device(struct clock_event_device *dev);
 extern int tick_is_broadcast_device(struct clock_event_device *dev);
@@ -95,7 +63,7 @@ extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadc
 extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq);
 extern struct tick_device *tick_get_broadcast_device(void);
 extern struct cpumask *tick_get_broadcast_mask(void);
-#else /* !BROADCAST */
+# else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */
 static inline void tick_install_broadcast_device(struct clock_event_device *dev) { }
 static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; }
 static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; }
@@ -113,7 +81,40 @@ static inline void tick_set_periodic_handler(struct clock_event_device *dev, int
 {
 	dev->event_handler = tick_handle_periodic;
 }
-#endif /* !BROADCAST */
+# endif /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */
+
+#else /* !GENERIC_CLOCKEVENTS: */
+static inline void tick_suspend(void) { }
+static inline void tick_resume(void) { }
+#endif /* !GENERIC_CLOCKEVENTS */
+
+/* Oneshot related functions */
+#ifdef CONFIG_TICK_ONESHOT
+extern void tick_setup_oneshot(struct clock_event_device *newdev,
+			       void (*handler)(struct clock_event_device *),
+			       ktime_t nextevt);
+extern int tick_program_event(ktime_t expires, int force);
+extern void tick_oneshot_notify(void);
+extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
+extern void tick_resume_oneshot(void);
+static inline bool tick_oneshot_possible(void) { return true; }
+extern int tick_oneshot_mode_active(void);
+extern void tick_clock_notify(void);
+extern int tick_check_oneshot_change(int allow_nohz);
+extern int tick_init_highres(void);
+#else /* !CONFIG_TICK_ONESHOT: */
+static inline
+void tick_setup_oneshot(struct clock_event_device *newdev,
+			void (*handler)(struct clock_event_device *),
+			ktime_t nextevt) { BUG(); }
+static inline void tick_resume_oneshot(void) { BUG(); }
+static inline int tick_program_event(ktime_t expires, int force) { return 0; }
+static inline void tick_oneshot_notify(void) { }
+static inline bool tick_oneshot_possible(void) { return false; }
+static inline int tick_oneshot_mode_active(void) { return 0; }
+static inline void tick_clock_notify(void) { }
+static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
+#endif /* !CONFIG_TICK_ONESHOT */
 
 /* Functions related to oneshot broadcasting */
 #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
@@ -125,7 +126,7 @@ extern int tick_broadcast_oneshot_active(void);
 extern void tick_check_oneshot_broadcast_this_cpu(void);
 bool tick_broadcast_oneshot_available(void);
 extern struct cpumask *tick_get_broadcast_oneshot_mask(void);
-#else /* BROADCAST && ONESHOT */
+#else /* !(BROADCAST && ONESHOT): */
 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) { BUG(); }
 static inline int tick_broadcast_oneshot_control(unsigned long reason) { return 0; }
 static inline void tick_broadcast_switch_to_oneshot(void) { }
@@ -133,7 +134,7 @@ static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
 static inline int tick_broadcast_oneshot_active(void) { return 0; }
 static inline void tick_check_oneshot_broadcast_this_cpu(void) { }
 static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); }
-#endif /* !BROADCAST && ONESHOT */
+#endif /* !(BROADCAST && ONESHOT) */
 
 /* NO_HZ_FULL internal */
 #ifdef CONFIG_NO_HZ_FULL