linux-kernel - Re: [patch 06/15] timers: Update kernel-doc for various functions

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Date:   Tue, 22 Nov 2022 10:38:26 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...uxfoundation.org>,
        Anna-Maria Behnsen <anna-maria@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Julia Lawall <Julia.Lawall@...ia.fr>,
        Arnd Bergmann <arnd@...db.de>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Marc Zyngier <maz@...nel.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        linux-bluetooth@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        Jonathan Corbet <corbet@....net>
Subject: Re: [patch 06/15] timers: Update kernel-doc for various functions

On Tue, 22 Nov 2022 16:18:37 +0100
Thomas Gleixner <tglx@...utronix.de> wrote:

> >>   *
> >> - * The function returns whether it has deactivated a pending timer or not.
> >> - * (ie. del_timer() of an inactive timer returns 0, del_timer() of an
> >> - * active timer returns 1.)
> >> + * Contrary to del_timer_sync() this function does not wait for an
> >> + * eventually running timer callback on a different CPU and it neither  
> >
> > I'm a little confused with the "eventually running timer". Does that simply
> > mean one that is about to run next (that is, it doesn't handle race
> > conditions and the timer is in the process of starting), but will still
> > deactivate one that has not been started and the timer code for that CPU
> > hasn't triggered yet?  
> 
> Let me try again.
> 
>   The function only deactivates a pending timer, but contrary to
>   del_timer_sync() it does not take into account whether the timers
>   callback function is concurrently executed on a different CPU or not.
> 
> Does that make more sense?

Yes, much better. Thanks!

-- Steve