[PATCH 6/7] posix-cpu-timers: Consolidate timer base accessor

Frederic Weisbecker
2021-06-22T23:42:19Z

Remove the ad-hoc timer base accessors and provide a consolidated one.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Eric W. Biederman <ebiederm@xmission.com>
---
kernel/time/posix-cpu-timers.c | 28 +++++++++++++---------------
1 file changed, 13 insertions(+), 15 deletions(-)

diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c
index 1ac36e6ca6d6..acc6843d4b31 100644
--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -407,6 +407,17 @@ static int posix_cpu_timer_create(struct k_itimer *new_timer)
return 0;
}

+static struct posix_cputimer_base *timer_base(struct k_itimer *timer,
+ struct task_struct *tsk)
+{
+ int clkidx = CPUCLOCK_WHICH(timer->it_clock);
+
+ if (CPUCLOCK_PERTHREAD(timer->it_clock))
+ return tsk->posix_cputimers.bases + clkidx;
+ else
+ return tsk->signal->posix_cputimers.bases + clkidx;
+}
+
/*
* Dequeue the timer and reset the base if it was its earliest expiration.
* It makes sure the next tick recalculates the base next expiration so we
@@ -421,18 +432,11 @@ static void disarm_timer(struct k_itimer *timer, struct task_struct *p)
{
struct cpu_timer *ctmr = &timer->it.cpu;
struct posix_cputimer_base *base;
- int clkidx;

if (!cpu_timer_dequeue(ctmr))
return;

- clkidx = CPUCLOCK_WHICH(timer->it_clock);
-
- if (CPUCLOCK_PERTHREAD(timer->it_clock))
- base = p->posix_cputimers.bases + clkidx;
- else
- base = p->signal->posix_cputimers.bases + clkidx;
-
+ base = timer_base(timer, p);
if (cpu_timer_getexpires(ctmr) == base->nextevt)
base->nextevt = 0;
}
@@ -531,15 +535,9 @@ void posix_cpu_timers_exit_group(struct task_struct *tsk)
*/
static void arm_timer(struct k_itimer *timer, struct task_struct *p)
{
- int clkidx = CPUCLOCK_WHICH(timer->it_clock);
+ struct posix_cputimer_base *base = timer_base(timer, p);
struct cpu_timer *ctmr = &timer->it.cpu;
u64 newexp = cpu_timer_getexpires(ctmr);
- struct posix_cputimer_base *base;
-
- if (CPUCLOCK_PERTHREAD(timer->it_clock))
- base = p->posix_cputimers.bases + clkidx;
- else
- base = p->signal->posix_cputimers.bases + clkidx;

if (!cpu_timer_enqueue(&base->tqhead, ctmr))
return;
--
2.25.1