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158 lines
4.8 KiB
Diff
158 lines
4.8 KiB
Diff
From 036160e2bf23c43f7a7eb4482cd372c2c5983389 Mon Sep 17 00:00:00 2001
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From: Anna-Maria Gleixner <anna-maria@linutronix.de>
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Date: Wed, 20 Dec 2017 17:13:02 +0100
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Subject: [PATCH 029/418] hrtimer: Reduce conditional code (hres_active)
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The hrtimer_cpu_base struct has the CONFIG_HIGH_RES_TIMERS conditional
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struct member hres_active. All related functions to this member are
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conditional as well.
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There is no functional change, when the hres_active member is
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unconditional with all related functions and is set to zero during
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initialization.
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The conditional code sections can be avoided by adding IS_ENABLED(HIGHRES)
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conditionals into common functions, which ensures dead code elimination.
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Suggested-by: Thomas Gleixner <tglx@linutronix.de>
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Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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include/linux/hrtimer.h | 20 ++++++++------------
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kernel/time/hrtimer.c | 31 +++++++++++++++----------------
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2 files changed, 23 insertions(+), 28 deletions(-)
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diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
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index 56e56bcb6f0f..22627b3a33fe 100644
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--- a/include/linux/hrtimer.h
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+++ b/include/linux/hrtimer.h
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@@ -161,8 +161,8 @@ enum hrtimer_base_type {
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* @cpu: cpu number
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* @active_bases: Bitfield to mark bases with active timers
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* @clock_was_set_seq: Sequence counter of clock was set events
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- * @in_hrtirq: hrtimer_interrupt() is currently executing
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* @hres_active: State of high resolution mode
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+ * @in_hrtirq: hrtimer_interrupt() is currently executing
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* @hang_detected: The last hrtimer interrupt detected a hang
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* @expires_next: absolute time of the next event, is required for remote
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* hrtimer enqueue
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@@ -182,9 +182,9 @@ struct hrtimer_cpu_base {
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unsigned int cpu;
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unsigned int active_bases;
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unsigned int clock_was_set_seq;
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+ unsigned int hres_active : 1;
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#ifdef CONFIG_HIGH_RES_TIMERS
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unsigned int in_hrtirq : 1,
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- hres_active : 1,
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hang_detected : 1;
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ktime_t expires_next;
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struct hrtimer *next_timer;
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@@ -266,16 +266,17 @@ static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer)
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return timer->base->get_time();
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}
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+static inline int hrtimer_is_hres_active(struct hrtimer *timer)
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+{
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+ return IS_ENABLED(CONFIG_HIGH_RES_TIMERS) ?
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+ timer->base->cpu_base->hres_active : 0;
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+}
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+
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#ifdef CONFIG_HIGH_RES_TIMERS
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struct clock_event_device;
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extern void hrtimer_interrupt(struct clock_event_device *dev);
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-static inline int hrtimer_is_hres_active(struct hrtimer *timer)
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-{
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- return timer->base->cpu_base->hres_active;
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-}
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-
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/*
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* The resolution of the clocks. The resolution value is returned in
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* the clock_getres() system call to give application programmers an
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@@ -298,11 +299,6 @@ extern unsigned int hrtimer_resolution;
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#define hrtimer_resolution (unsigned int)LOW_RES_NSEC
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-static inline int hrtimer_is_hres_active(struct hrtimer *timer)
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-{
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- return 0;
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-}
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-
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static inline void clock_was_set_delayed(void) { }
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#endif
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diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
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index bedfc2865901..7e0490143275 100644
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--- a/kernel/time/hrtimer.c
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+++ b/kernel/time/hrtimer.c
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@@ -512,6 +512,20 @@ static inline ktime_t hrtimer_update_base(struct hrtimer_cpu_base *base)
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offs_real, offs_boot, offs_tai);
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}
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+/*
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+ * Is the high resolution mode active ?
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+ */
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+static inline int __hrtimer_hres_active(struct hrtimer_cpu_base *cpu_base)
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+{
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+ return IS_ENABLED(CONFIG_HIGH_RES_TIMERS) ?
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+ cpu_base->hres_active : 0;
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+}
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+
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+static inline int hrtimer_hres_active(void)
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+{
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+ return __hrtimer_hres_active(this_cpu_ptr(&hrtimer_bases));
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+}
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+
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/* High resolution timer related functions */
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#ifdef CONFIG_HIGH_RES_TIMERS
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@@ -540,19 +554,6 @@ static inline int hrtimer_is_hres_enabled(void)
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return hrtimer_hres_enabled;
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}
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-/*
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- * Is the high resolution mode active ?
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- */
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-static inline int __hrtimer_hres_active(struct hrtimer_cpu_base *cpu_base)
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-{
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- return cpu_base->hres_active;
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-}
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-
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-static inline int hrtimer_hres_active(void)
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-{
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- return __hrtimer_hres_active(this_cpu_ptr(&hrtimer_bases));
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-}
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-
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/*
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* Reprogram the event source with checking both queues for the
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* next event
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@@ -662,7 +663,6 @@ static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base)
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{
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base->expires_next = KTIME_MAX;
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base->hang_detected = 0;
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- base->hres_active = 0;
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base->next_timer = NULL;
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}
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@@ -722,8 +722,6 @@ void clock_was_set_delayed(void)
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#else
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-static inline int __hrtimer_hres_active(struct hrtimer_cpu_base *b) { return 0; }
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-static inline int hrtimer_hres_active(void) { return 0; }
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static inline int hrtimer_is_hres_enabled(void) { return 0; }
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static inline void hrtimer_switch_to_hres(void) { }
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static inline void
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@@ -1605,6 +1603,7 @@ int hrtimers_prepare_cpu(unsigned int cpu)
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cpu_base->active_bases = 0;
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cpu_base->cpu = cpu;
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+ cpu_base->hres_active = 0;
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hrtimer_init_hres(cpu_base);
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return 0;
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}
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--
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2.17.1
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