linux-kernel - [RFC][PATCH 1/5] tick/nohz: Improve tick_nohz_get_next

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Message-ID: <1775695.tdWV9SEqCh@kreacher>
Date:   Mon, 29 Mar 2021 20:11:49 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux PM <linux-pm@...r.kernel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Zhou Ti (x2019cwm)" <x2019cwm@...x.ca>
Subject: [RFC][PATCH 1/5] tick/nohz: Improve tick_nohz_get_next_hrtimer() kerneldoc

From: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>

Make the tick_nohz_get_next_hrtimer() kerneldoc comment state clearly
that the function may return negative numbers.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 kernel/time/tick-sched.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Index: linux-pm/kernel/time/tick-sched.c
===================================================================
--- linux-pm.orig/kernel/time/tick-sched.c
+++ linux-pm/kernel/time/tick-sched.c
@@ -1124,7 +1124,11 @@ ktime_t tick_nohz_get_next_hrtimer(void)
  * tick_nohz_get_sleep_length - return the expected length of the current sleep
  * @delta_next: duration until the next event if the tick cannot be stopped
  *
- * Called from power state control code with interrupts disabled
+ * Called from power state control code with interrupts disabled.
+ *
+ * The return value of this function and/or the value returned by it through the
+ * @delta_next pointer can be negative which must be taken into account by its
+ * callers.
  */
 ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next)
 {