From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Linux PM <linux-pm@vger.kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
Frederic Weisbecker <frederic@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
"Zhou Ti (x2019cwm)" <x2019cwm@stfx.ca>
Subject: [PATCH v1 1/5] tick/nohz: Improve tick_nohz_get_next_hrtimer() kerneldoc
Date: Mon, 29 Mar 2021 20:13:37 +0200 [thread overview]
Message-ID: <3104403.44csPzL39Z@kreacher> (raw)
In-Reply-To: <2764850.e9J7NaK4W3@kreacher>
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.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@intel.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)
{
next prev parent reply other threads:[~2021-03-29 18:38 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-29 18:12 [PATCH v1 0/5] cpuidle: Take possible negative "sleep length" values into account Rafael J. Wysocki
2021-03-29 18:13 ` Rafael J. Wysocki [this message]
2021-03-29 18:15 ` [PATCH v1 2/5] cpuidle: Use s64 as exit_latency_ns and target_residency_ns data type Rafael J. Wysocki
2021-03-29 18:19 ` [PATCH v1 3/5] cpuidle: teo: Adjust handling of very short idle times Rafael J. Wysocki
2021-03-29 18:21 ` [PATCH v1 4/5] cpuidle: teo: Take negative "sleep length" values into account Rafael J. Wysocki
2021-03-29 18:37 ` [PATCH v1 5/5] cpuidle: menu: " Rafael J. Wysocki
2021-03-30 1:59 ` Zhou Ti (x2019cwm)
2021-03-30 14:47 ` Rafael J. Wysocki
2021-04-07 17:24 ` [PATCH v1 0/5] cpuidle: Take possible " Rafael J. Wysocki
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