linux-kernel - [tip:timers/core] hrtimer: Use bits for various boolean indicators

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Date:	Wed, 22 Apr 2015 12:07:05 -0700
From:	tip-bot for Thomas Gleixner <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	mingo@...nel.org, fweisbec@...il.com, tglx@...utronix.de,
	mtosatti@...hat.com, preeti@...ux.vnet.ibm.com, hpa@...or.com,
	linux-kernel@...r.kernel.org, viresh.kumar@...aro.org,
	peterz@...radead.org
Subject: [tip:timers/core] hrtimer:
  Use bits for various boolean indicators

Commit-ID:  e19ffe8be2cd0a1f726b235443eba21e64f6be5e
Gitweb:     http://git.kernel.org/tip/e19ffe8be2cd0a1f726b235443eba21e64f6be5e
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Tue, 14 Apr 2015 21:08:39 +0000
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Wed, 22 Apr 2015 17:06:49 +0200

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@...utronix.de>
Acked-by: Peter Zijlstra <peterz@...radead.org>
Cc: Preeti U Murthy <preeti@...ux.vnet.ibm.com>
Cc: Viresh Kumar <viresh.kumar@...aro.org>
Cc: Marcelo Tosatti <mtosatti@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Link: http://lkml.kernel.org/r/20150414203501.227955358@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 include/linux/hrtimer.h |  6 +++---
 kernel/time/hrtimer.c   | 24 ++++++++++++++++--------
 2 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 5e04f8f..17a59dd 100644
--- 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
--- 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);
--
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