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posix-cpu-timers: Split run_posix_cpu_timers()

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Split it up as a preparatory step to move the heavy lifting out of
interrupt context.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20200730102337.677439437@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-07-30 12:14:05 +02:00 committed by Ingo Molnar
parent 4da9f33026
commit 820903c784
1 changed files with 24 additions and 19 deletions
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43
kernel/time/posix-cpu-timers.c
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@ -1080,32 +1080,15 @@ static inline bool fastpath_timer_check(struct task_struct *tsk)
return false;
}
/*
* This is called from the timer interrupt handler. The irq handler has
* already updated our counts. We need to check if any timers fire now.
* Interrupts are disabled.
*/
void run_posix_cpu_timers(void)
static void __run_posix_cpu_timers(struct task_struct *tsk)
{
struct task_struct *tsk = current;
struct k_itimer *timer, *next;
unsigned long flags;
LIST_HEAD(firing);
lockdep_assert_irqs_disabled();
/*
* The fast path checks that there are no expired thread or thread
* group timers. If that's so, just return.
*/
if (!fastpath_timer_check(tsk))
if (!lock_task_sighand(tsk, &flags))
return;
lockdep_posixtimer_enter();
if (!lock_task_sighand(tsk, &flags)) {
lockdep_posixtimer_exit();
return;
}
/*
* Here we take off tsk->signal->cpu_timers[N] and
* tsk->cpu_timers[N] all the timers that are firing, and
@ -1147,6 +1130,28 @@ void run_posix_cpu_timers(void)
cpu_timer_fire(timer);
spin_unlock(&timer->it_lock);
}
}
/*
* This is called from the timer interrupt handler. The irq handler has
* already updated our counts. We need to check if any timers fire now.
* Interrupts are disabled.
*/
void run_posix_cpu_timers(void)
{
struct task_struct *tsk = current;
lockdep_assert_irqs_disabled();
/*
* The fast path checks that there are no expired thread or thread
* group timers. If that's so, just return.
*/
if (!fastpath_timer_check(tsk))
return;
lockdep_posixtimer_enter();
__run_posix_cpu_timers(tsk);
lockdep_posixtimer_exit();
}