linux-kernel - Re: [PATCH v4a 00/38] timers: Use timer

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Message-ID: <Y2bPlllkHo5DUmLY@zx2c4.com>
Date:   Sat, 5 Nov 2022 22:03:18 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <sboyd@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>, rcu@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, linux-edac@...r.kernel.org,
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Subject: Re: [PATCH v4a 00/38] timers: Use timer_shutdown*() before freeing
 timers

On Sat, Nov 05, 2022 at 12:36:42PM -0400, Steven Rostedt wrote:
> ----------------------8<------------------------
> @@
> identifier ptr, timer, rfield, slab;
> @@
> (
> -	del_timer(&ptr->timer);
> +	timer_shutdown(&ptr->timer);
> |
> -	del_timer_sync(&ptr->timer);
> +	timer_shutdown_sync(&ptr->timer);
> )
>     ...
> (
> 	kfree_rcu(ptr, rfield);
> |
> 	kmem_cache_free(slab, ptr);
> |
> 	kfree(ptr);
> )
> ---------------------->8------------------------

Something that might help here is changing the `...` into
`... when exists` or into `... when != ptr` or similar.
See this section of the manual:
https://coccinelle.gitlabpages.inria.fr/website/docs/main_grammar004.html

Jason