linux-kernel - [PATCH v3 2/3] hrtimer: Convert realtime_task() to realtime_task

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Date: Tue, 28 May 2024 00:45:07 +0100
From: Qais Yousef <qyousef@...alina.io>
To: Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>
Cc: Vincent Guittot <vincent.guittot@...aro.org>,
	Daniel Bristot de Oliveira <bristot@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>,
	linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	Qais Yousef <qyousef@...alina.io>
Subject: [PATCH v3 2/3] hrtimer: Convert realtime_task() to realtime_task_policy()

As Sebastian explained in [1], We need only look at the policy to decide
if we need to remove the slack because PI-boosted tasks should not
sleep.

[1] https://lore.kernel.org/lkml/20240521110035.KRIwllGe@linutronix.de/

Suggested-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Qais Yousef <qyousef@...alina.io>
---
 kernel/time/hrtimer.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 89d4da59059d..36086ab46d08 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -2073,7 +2073,7 @@ long hrtimer_nanosleep(ktime_t rqtp, const enum hrtimer_mode mode,
 	u64 slack;
 
 	slack = current->timer_slack_ns;
-	if (realtime_task(current))
+	if (realtime_task_policy(current))
 		slack = 0;
 
 	hrtimer_init_sleeper_on_stack(&t, clockid, mode);
@@ -2278,7 +2278,7 @@ schedule_hrtimeout_range_clock(ktime_t *expires, u64 delta,
 	 * Override any slack passed by the user if under
 	 * rt contraints.
 	 */
-	if (realtime_task(current))
+	if (realtime_task_policy(current))
 		delta = 0;
 
 	hrtimer_init_sleeper_on_stack(&t, clock_id, mode);
-- 
2.34.1