hrtimer: Use bits for various boolean indicators

No point in wasting 12 byte storage space. Generates better code as well.

Text size reduction:
       x8664 -64, i386 -16, ARM -132, ARM64 -0, power64 -48

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/20150414203501.227955358@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 5e04f8f..17a59dd 100644 (file)
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -181,10 +181,10 @@ struct hrtimer_cpu_base {
        unsigned int                    active_bases;
        unsigned int                    clock_was_set_seq;
 #ifdef CONFIG_HIGH_RES_TIMERS
+       unsigned int                    in_hrtirq       : 1,
+                                       hres_active     : 1,
+                                       hang_detected   : 1;
        ktime_t                         expires_next;
-       int                             in_hrtirq;
-       int                             hres_active;
-       int                             hang_detected;
        unsigned int                    nr_events;
        unsigned int                    nr_retries;
        unsigned int                    nr_hangs;

diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 8ce9b31..9bbfe33 100644 (file)
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -492,9 +492,14 @@ static inline int hrtimer_is_hres_enabled(void)
 /*
  * Is the high resolution mode active ?
  */
+static inline int __hrtimer_hres_active(struct hrtimer_cpu_base *cpu_base)
+{
+       return cpu_base->hres_active;
+}
+
 static inline int hrtimer_hres_active(void)
 {
-       return __this_cpu_read(hrtimer_bases.hres_active);
+       return __hrtimer_hres_active(this_cpu_ptr(&hrtimer_bases));
 }
 
 /*
@@ -628,7 +633,7 @@ static void retrigger_next_event(void *arg)
 {
        struct hrtimer_cpu_base *base = this_cpu_ptr(&hrtimer_bases);
 
-       if (!hrtimer_hres_active())
+       if (!base->hres_active)
                return;
 
        raw_spin_lock(&base->lock);
@@ -685,6 +690,7 @@ void clock_was_set_delayed(void)
 
 #else
 
+static inline int __hrtimer_hres_active(struct hrtimer_cpu_base *b) { return 0; }
 static inline int hrtimer_hres_active(void) { return 0; }
 static inline int hrtimer_is_hres_enabled(void) { return 0; }
 static inline int hrtimer_switch_to_hres(void) { return 0; }
@@ -862,25 +868,27 @@ static void __remove_hrtimer(struct hrtimer *timer,
                             struct hrtimer_clock_base *base,
                             unsigned long newstate, int reprogram)
 {
+       struct hrtimer_cpu_base *cpu_base = base->cpu_base;
        struct timerqueue_node *next_timer;
+
        if (!(timer->state & HRTIMER_STATE_ENQUEUED))
                goto out;
 
        next_timer = timerqueue_getnext(&base->active);
        timerqueue_del(&base->active, &timer->node);
        if (!timerqueue_getnext(&base->active))
-               base->cpu_base->active_bases &= ~(1 << base->index);
+               cpu_base->active_bases &= ~(1 << base->index);
 
        if (&timer->node == next_timer) {
 #ifdef CONFIG_HIGH_RES_TIMERS
                /* Reprogram the clock event device. if enabled */
-               if (reprogram && hrtimer_hres_active()) {
+               if (reprogram && cpu_base->hres_active) {
                        ktime_t expires;
 
                        expires = ktime_sub(hrtimer_get_expires(timer),
                                            base->offset);
-                       if (base->cpu_base->expires_next.tv64 == expires.tv64)
-                               hrtimer_force_reprogram(base->cpu_base, 1);
+                       if (cpu_base->expires_next.tv64 == expires.tv64)
+                               hrtimer_force_reprogram(cpu_base, 1);
                }
 #endif
        }
@@ -1114,7 +1122,7 @@ ktime_t hrtimer_get_next_event(void)
 
        raw_spin_lock_irqsave(&cpu_base->lock, flags);
 
-       if (!hrtimer_hres_active())
+       if (!__hrtimer_hres_active(cpu_base))
                mindelta = ktime_sub(__hrtimer_get_next_event(cpu_base),
                                     ktime_get());
 
@@ -1412,7 +1420,7 @@ void hrtimer_run_queues(void)
        struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases);
        ktime_t now;
 
-       if (hrtimer_hres_active())
+       if (__hrtimer_hres_active(cpu_base))
                return;
 
        raw_spin_lock(&cpu_base->lock);