linux-kernel - [patch V3 21/51] posix-cpu-timers: Make k_itimer::it

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Message-ID: <20240610164026.806827615@linutronix.de>
Date: Mon, 10 Jun 2024 18:42:31 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Anna-Maria Behnsen <anna-maria@...utronix.de>,
 Frederic Weisbecker <frederic@...nel.org>,
 John Stultz <jstultz@...gle.com>,
 Peter Zijlstra <peterz@...radead.org>,
 Ingo Molnar <mingo@...nel.org>,
 Stephen Boyd <sboyd@...nel.org>,
 Eric Biederman <ebiederm@...ssion.com>,
 Oleg Nesterov <oleg@...hat.com>
Subject: [patch V3 21/51] posix-cpu-timers: Make k_itimer::it_active
 consistent

Posix CPU timers are not updating k_itimer::it_active which makes it
impossible to base decisions in the common posix timer code on it.

Update it when queueing or dequeueing posix CPU timers.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
V2: Move the clearing to cpu_timer_fire() - Frederic
---
 kernel/time/posix-cpu-timers.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -453,6 +453,7 @@ static void disarm_timer(struct k_itimer
 	struct cpu_timer *ctmr = &timer->it.cpu;
 	struct posix_cputimer_base *base;
 
+	timer->it_active = 0;
 	if (!cpu_timer_dequeue(ctmr))
 		return;
 
@@ -559,6 +560,7 @@ static void arm_timer(struct k_itimer *t
 	struct cpu_timer *ctmr = &timer->it.cpu;
 	u64 newexp = cpu_timer_getexpires(ctmr);
 
+	timer->it_active = 1;
 	if (!cpu_timer_enqueue(&base->tqhead, ctmr))
 		return;
 
@@ -584,6 +586,7 @@ static void cpu_timer_fire(struct k_itim
 {
 	struct cpu_timer *ctmr = &timer->it.cpu;
 
+	timer->it_active = 0;
 	if (unlikely(timer->sigq == NULL)) {
 		/*
 		 * This a special case for clock_nanosleep,
@@ -668,6 +671,7 @@ static int posix_cpu_timer_set(struct k_
 		ret = TIMER_RETRY;
 	} else {
 		cpu_timer_dequeue(ctmr);
+		timer->it_active = 0;
 	}
 
 	/*