linux-kernel - [patch V2 10/38] posix-cpu-timers: Use clock ID in posix_cpu_timer

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Date:   Wed, 21 Aug 2019 21:08:57 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Oleg Nesterov <oleg@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        John Stultz <john.stultz@...aro.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Anna-Maria Behnsen <anna-maria@...utronix.de>,
        Christoph Hellwig <hch@....de>
Subject: [patch V2 10/38] posix-cpu-timers: Use clock ID in
 posix_cpu_timer_get()

Extract the clock ID (PROF/VIRT/SCHED) from the clock selector and use it
as argument to the sample functions. That allows to simplify them once all
callers are fixed.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/time/posix-cpu-timers.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -699,6 +699,7 @@ static int posix_cpu_timer_set(struct k_
 
 static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec64 *itp)
 {
+	clockid_t clkid = CPUCLOCK_WHICH(timer->it_clock);
 	struct task_struct *p = timer->it.cpu.task;
 	u64 now;
 
@@ -717,7 +718,7 @@ static void posix_cpu_timer_get(struct k
 	 * Sample the clock to take the difference with the expiry time.
 	 */
 	if (CPUCLOCK_PERTHREAD(timer->it_clock)) {
-		cpu_clock_sample(timer->it_clock, p, &now);
+		cpu_clock_sample(clkid, p, &now);
 	} else {
 		struct sighand_struct *sighand;
 		unsigned long flags;
@@ -737,7 +738,7 @@ static void posix_cpu_timer_get(struct k
 			timer->it.cpu.expires = 0;
 			return;
 		} else {
-			cpu_clock_sample_group(timer->it_clock, p, &now, false);
+			cpu_clock_sample_group(clkid, p, &now, false);
 			unlock_task_sighand(p, &flags);
 		}
 	}