From 11a9fe069e341ac53bddb8fe1a85ea986cff1a42 Mon Sep 17 00:00:00 2001 From: Anna-Maria Gleixner Date: Thu, 21 Dec 2017 11:41:46 +0100 Subject: hrtimer: Make hrtimer_reprogramm() unconditional hrtimer_reprogram() needs to be available unconditionally for softirq based hrtimers. Move the function and all required struct members out of the CONFIG_HIGH_RES_TIMERS #ifdef. There is no functional change because hrtimer_reprogram() is only invoked when hrtimer_cpu_base.hres_active is true. Making it unconditional increases the text size for the CONFIG_HIGH_RES_TIMERS=n case, but avoids replication of that code for the upcoming softirq based hrtimers support. Signed-off-by: Anna-Maria Gleixner Cc: Christoph Hellwig Cc: John Stultz Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: keescook@chromium.org Link: http://lkml.kernel.org/r/20171221104205.7269-18-anna-maria@linutronix.de Signed-off-by: Ingo Molnar --- kernel/time/hrtimer.c | 129 ++++++++++++++++++++++++-------------------------- 1 file changed, 62 insertions(+), 67 deletions(-) (limited to 'kernel/time') diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c index 26abaa7b0419..63d804aea1ea 100644 --- a/kernel/time/hrtimer.c +++ b/kernel/time/hrtimer.c @@ -581,68 +581,6 @@ hrtimer_force_reprogram(struct hrtimer_cpu_base *cpu_base, int skip_equal) tick_program_event(cpu_base->expires_next, 1); } -/* - * When a timer is enqueued and expires earlier than the already enqueued - * timers, we have to check, whether it expires earlier than the timer for - * which the clock event device was armed. - * - * Called with interrupts disabled and base->cpu_base.lock held - */ -static void hrtimer_reprogram(struct hrtimer *timer, - struct hrtimer_clock_base *base) -{ - struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases); - ktime_t expires = ktime_sub(hrtimer_get_expires(timer), base->offset); - - WARN_ON_ONCE(hrtimer_get_expires_tv64(timer) < 0); - - /* - * If the timer is not on the current cpu, we cannot reprogram - * the other cpus clock event device. - */ - if (base->cpu_base != cpu_base) - return; - - /* - * If the hrtimer interrupt is running, then it will - * reevaluate the clock bases and reprogram the clock event - * device. The callbacks are always executed in hard interrupt - * context so we don't need an extra check for a running - * callback. - */ - if (cpu_base->in_hrtirq) - return; - - /* - * CLOCK_REALTIME timer might be requested with an absolute - * expiry time which is less than base->offset. Set it to 0. - */ - if (expires < 0) - expires = 0; - - if (expires >= cpu_base->expires_next) - return; - - /* Update the pointer to the next expiring timer */ - cpu_base->next_timer = timer; - - /* - * If a hang was detected in the last timer interrupt then we - * do not schedule a timer which is earlier than the expiry - * which we enforced in the hang detection. We want the system - * to make progress. - */ - if (cpu_base->hang_detected) - return; - - /* - * Program the timer hardware. We enforce the expiry for - * events which are already in the past. - */ - cpu_base->expires_next = expires; - tick_program_event(expires, 1); -} - /* * Retrigger next event is called after clock was set * @@ -703,15 +641,72 @@ static inline int hrtimer_is_hres_enabled(void) { return 0; } static inline void hrtimer_switch_to_hres(void) { } static inline void hrtimer_force_reprogram(struct hrtimer_cpu_base *base, int skip_equal) { } -static inline int hrtimer_reprogram(struct hrtimer *timer, - struct hrtimer_clock_base *base) -{ - return 0; -} static inline void retrigger_next_event(void *arg) { } #endif /* CONFIG_HIGH_RES_TIMERS */ +/* + * When a timer is enqueued and expires earlier than the already enqueued + * timers, we have to check, whether it expires earlier than the timer for + * which the clock event device was armed. + * + * Called with interrupts disabled and base->cpu_base.lock held + */ +static void hrtimer_reprogram(struct hrtimer *timer, + struct hrtimer_clock_base *base) +{ + struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases); + ktime_t expires = ktime_sub(hrtimer_get_expires(timer), base->offset); + + WARN_ON_ONCE(hrtimer_get_expires_tv64(timer) < 0); + + /* + * If the timer is not on the current cpu, we cannot reprogram + * the other cpus clock event device. + */ + if (base->cpu_base != cpu_base) + return; + + /* + * If the hrtimer interrupt is running, then it will + * reevaluate the clock bases and reprogram the clock event + * device. The callbacks are always executed in hard interrupt + * context so we don't need an extra check for a running + * callback. + */ + if (cpu_base->in_hrtirq) + return; + + /* + * CLOCK_REALTIME timer might be requested with an absolute + * expiry time which is less than base->offset. Set it to 0. + */ + if (expires < 0) + expires = 0; + + if (expires >= cpu_base->expires_next) + return; + + /* Update the pointer to the next expiring timer */ + cpu_base->next_timer = timer; + + /* + * If a hang was detected in the last timer interrupt then we + * do not schedule a timer which is earlier than the expiry + * which we enforced in the hang detection. We want the system + * to make progress. + */ + if (cpu_base->hang_detected) + return; + + /* + * Program the timer hardware. We enforce the expiry for + * events which are already in the past. + */ + cpu_base->expires_next = expires; + tick_program_event(expires, 1); +} + /* * Clock realtime was set * -- cgit v1.2.3