linux-kernel - [PATCH v3 22/36] hrtimer: Remove base argument from hrtimer

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Date:   Wed, 29 Nov 2017 16:30:47 +0100
From:   Anna-Maria Gleixner <anna-maria@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, keescook@...omium.org,
        Christoph Hellwig <hch@....de>,
        John Stultz <john.stultz@...aro.org>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>
Subject: [PATCH v3 22/36] hrtimer: Remove base argument from hrtimer_reprogram()

hrtimer_reprogram() must have access to the hrtimer_clock_base of the new
first expiring timer to access hrtimer_clock_base.offset for adjusting the
expiry time to CLOCK_MONOTONIC. This is required to evaluate whether the
new left most timer in the hrtimer_clock_base is the first expiring timer
of all clock bases in a hrtimer_cpu_base.

The only user of hrtimer_reprogram() is hrtimer_start_range_ns(), which has
a pointer to hrtimer_clock_base already and hands it in as an argument. But
hrtimer_start_range_ns() will be split for the upcoming support for softirq
based hrtimers to avoid code duplication and will lose the direct access to
the clock base pointer.

Instead of handing in timer and timer->base as an argument remove the base
argument from hrtimer_reprogram() and retrieve the clock base internally.

Signed-off-by: Anna-Maria Gleixner <anna-maria@...utronix.de>
---
 kernel/time/hrtimer.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index e0521d8f247b..771f3463502e 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -650,10 +650,10 @@ static inline void retrigger_next_event(void *arg) { }
  *
  * Called with interrupts disabled and base->cpu_base.lock held
  */
-static void hrtimer_reprogram(struct hrtimer *timer,
-			      struct hrtimer_clock_base *base)
+static void hrtimer_reprogram(struct hrtimer *timer)
 {
 	struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases);
+	struct hrtimer_clock_base *base = timer->base;
 	ktime_t expires = ktime_sub(hrtimer_get_expires(timer), base->offset);

 	WARN_ON_ONCE(hrtimer_get_expires_tv64(timer) < 0);
@@ -941,7 +941,7 @@ void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
 	if (!leftmost)
 		goto unlock;

-	hrtimer_reprogram(timer, new_base);
+	hrtimer_reprogram(timer);
 unlock:
 	unlock_hrtimer_base(timer, &flags);
 }
-- 
2.11.0