linux-kernel - Re: [PATCH v5 02/18] timer: Add comment to get_next_timer

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Message-ID: <ZDUqGCU3O7pIzn0O@lothringen>
Date:   Tue, 11 Apr 2023 11:36:24 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Anna-Maria Behnsen <anna-maria@...utronix.de>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        John Stultz <jstultz@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Eric Dumazet <edumazet@...gle.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Arjan van de Ven <arjan@...radead.org>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Rik van Riel <riel@...riel.com>
Subject: Re: [PATCH v5 02/18] timer: Add comment to
 get_next_timer_interrupt() description

On Wed, Mar 01, 2023 at 03:17:28PM +0100, Anna-Maria Behnsen wrote:
> get_next_timer_interrupt() does more than simply getting the next timer
> interrupt. The timer bases are forwarded and also marked as idle whenever
> possible.
> 
> To get not confused, add a comment to function description.
> 
> Signed-off-by: Anna-Maria Behnsen <anna-maria@...utronix.de>
> ---
> v5: New patch, which adds only a comment to get_next_timer_interrupt()
> instead of changing the function name
> ---
>  kernel/time/timer.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/kernel/time/timer.c b/kernel/time/timer.c
> index 63a8ce7177dd..ffb94bc3852f 100644
> --- a/kernel/time/timer.c
> +++ b/kernel/time/timer.c
> @@ -1915,6 +1915,10 @@ static u64 cmp_next_hrtimer_event(u64 basem, u64 expires)
>   * @basej:	base time jiffies
>   * @basem:	base time clock monotonic
>   *
> + * If required, base->clk is forwarded and base is also marked as
> + * idle. Idle handling of timer bases is allowed only to be done by CPU
> + * itself.

Idle marking you mean? Because idle handling can be done remotely after
this patchset.

Thanks.

> + *
>   * Returns the tick aligned clock monotonic time of the next pending
>   * timer or KTIME_MAX if no timer is pending.
>   */
> -- 
> 2.30.2
>