tick: Rename tick_check_idle() to tick_irq_enter()

This makes the code more symetric against the existing tick functions
called on irq exit: tick_irq_exit() and tick_nohz_irq_exit().

These function are also symetric as they mirror each other's action:
we start to account idle time on irq exit and we stop this accounting
on irq entry. Also the tick is stopped on irq exit and timekeeping
catches up with the tickless time elapsed until we reach irq entry.

This rename was suggested by Peter Zijlstra a long while ago but it
got forgotten in the mass.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Alex Shi <alex.shi@linaro.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Kevin Hilman <khilman@linaro.org>
Link: http://lkml.kernel.org/r/1387320692-28460-2-git-send-email-fweisbec@gmail.com
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>

diff --git a/include/linux/tick.h b/include/linux/tick.h
index 0175d8663b6cbd9cb259b5715436fbd09e0ce213..b84773cb9f4c1f3fc480a460ba3c37a2121e1557 100644 (file)
--- a/include/linux/tick.h
+++ b/include/linux/tick.h
@@ -104,7 +104,7 @@ extern struct cpumask *tick_get_broadcast_oneshot_mask(void);
 extern void tick_clock_notify(void);
 extern int tick_check_oneshot_change(int allow_nohz);
 extern struct tick_sched *tick_get_tick_sched(int cpu);
-extern void tick_check_idle(void);
+extern void tick_irq_enter(void);
 extern int tick_oneshot_mode_active(void);
 #  ifndef arch_needs_cpu
 #   define arch_needs_cpu(cpu) (0)
@@ -112,7 +112,7 @@ extern int tick_oneshot_mode_active(void);
 # else
 static inline void tick_clock_notify(void) { }
 static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
-static inline void tick_check_idle(void) { }
+static inline void tick_irq_enter(void) { }
 static inline int tick_oneshot_mode_active(void) { return 0; }
 # endif
 
@@ -121,7 +121,7 @@ static inline void tick_init(void) { }
 static inline void tick_cancel_sched_timer(int cpu) { }
 static inline void tick_clock_notify(void) { }
 static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
-static inline void tick_check_idle(void) { }
+static inline void tick_irq_enter(void) { }
 static inline int tick_oneshot_mode_active(void) { return 0; }
 #endif /* !CONFIG_GENERIC_CLOCKEVENTS */
 

diff --git a/kernel/softirq.c b/kernel/softirq.c
index 11348de09400b4ceb9526cb4c29b00102a689e4b..ca9cb35a96d4973b51e58f9528f93cdd57382e06 100644 (file)
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -318,7 +318,7 @@ void irq_enter(void)
                 * here, as softirq will be serviced on return from interrupt.
                 */
                local_bh_disable();
-               tick_check_idle();
+               tick_irq_enter();
                _local_bh_enable();
        }
 

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 0ddd020bbaf2af54b7d4c5cc8594361c71853d8d..e4d0f093061f5af49d7eab3a8aa89408dae96d84 100644 (file)
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -1023,7 +1023,7 @@ static void tick_nohz_kick_tick(struct tick_sched *ts, ktime_t now)
 #endif
 }
 
-static inline void tick_check_nohz_this_cpu(void)
+static inline void tick_nohz_irq_enter(void)
 {
        struct tick_sched *ts = &__get_cpu_var(tick_cpu_sched);
        ktime_t now;
@@ -1042,17 +1042,17 @@ static inline void tick_check_nohz_this_cpu(void)
 #else
 
 static inline void tick_nohz_switch_to_nohz(void) { }
-static inline void tick_check_nohz_this_cpu(void) { }
+static inline void tick_nohz_irq_enter(void) { }
 
 #endif /* CONFIG_NO_HZ_COMMON */
 
 /*
  * Called from irq_enter to notify about the possible interruption of idle()
  */
-void tick_check_idle(void)
+void tick_irq_enter(void)
 {
        tick_check_oneshot_broadcast_this_cpu();
-       tick_check_nohz_this_cpu();
+       tick_nohz_irq_enter();
 }
 
 /*