patches/0016-hrtimer-Allow-function-reuse-for-softirq-based-hrtim.patch

From: Anna-Maria Gleixner <anna-maria@linutronix.de>
Date: Thu, 31 Aug 2017 11:03:08 +0000
Subject: [PATCH 16/25] hrtimer: Allow function reuse for softirq based hrtimer

The softirq based hrtimer can utilize most of the existing hrtimer
functions, but need to operate on a different data set. Add an active_mask
argument to various functions so the hard and soft bases can be
selected. Fixup the existing callers and hand in the ACTIVE_HARD mask.

Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 kernel/time/hrtimer.c |   20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -71,6 +71,14 @@
 #define CLOCK_TAI_SOFT		(CLOCK_TAI	 | HRTIMER_BASE_SOFT_MASK)
 
 /*
+ * Masks for selecting the soft and hard context timers from
+ * cpu_base->active
+ */
+#define MASK_SHIFT		(HRTIMER_BASE_MONOTONIC_SOFT)
+#define HRTIMER_ACTIVE_HARD	((1U << MASK_SHIFT) - 1)
+#define HRTIMER_ACTIVE_SOFT	(HRTIMER_ACTIVE_HARD << MASK_SHIFT)
+
+/*
  * The timer bases:
  *
  * There are more clockids than hrtimer bases. Thus, we index
@@ -526,11 +534,12 @@ static ktime_t __hrtimer_next_event_base
 
 static ktime_t __hrtimer_get_next_event(struct hrtimer_cpu_base *cpu_base)
 {
-	unsigned int active = cpu_base->active_bases;
+	unsigned int active;
 	ktime_t expires_next = KTIME_MAX;
 
 	hrtimer_update_next_timer(cpu_base, NULL);
 
+	active = cpu_base->active_bases & HRTIMER_ACTIVE_HARD;
 	expires_next = __hrtimer_next_event_base(cpu_base, active, expires_next);
 
 	return expires_next;
@@ -1263,9 +1272,10 @@ static void __run_hrtimer(struct hrtimer
 	base->running = NULL;
 }
 
-static void __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t now)
+static void __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t now,
+				 unsigned int active_mask)
 {
-	unsigned int active = cpu_base->active_bases;
+	unsigned int active = cpu_base->active_bases & active_mask;
 
 	while (active) {
 		unsigned int id = __ffs(active);
@@ -1332,7 +1342,7 @@ void hrtimer_interrupt(struct clock_even
 	 */
 	cpu_base->expires_next = KTIME_MAX;
 
-	__hrtimer_run_queues(cpu_base, now);
+	__hrtimer_run_queues(cpu_base, now, HRTIMER_ACTIVE_HARD);
 
 	/* Reevaluate the clock bases for the next expiry */
 	expires_next = __hrtimer_get_next_event(cpu_base);
@@ -1437,7 +1447,7 @@ void hrtimer_run_queues(void)
 
 	raw_spin_lock(&cpu_base->lock);
 	now = hrtimer_update_base(cpu_base);
-	__hrtimer_run_queues(cpu_base, now);
+	__hrtimer_run_queues(cpu_base, now, HRTIMER_ACTIVE_HARD);
 	raw_spin_unlock(&cpu_base->lock);
 }