Re: [PATCH] tracing: Cleanup event_enable_trigger_parse() by using __free()

[Steven Rostedt <rostedt@goodmis.org>]

On Fri, 3 Jul 2026 07:00:10 +0200
Markus Elfring <Markus.Elfring@web.de> wrote:

> > No, it's fine as is.  
> Does this feedback mean that you disagree to an essential development requirement
> according to such a programming interface?
> https://elixir.bootlin.com/linux/v7.1.2/source/include/linux/cleanup.h#L142-L153

>  * Given that the "__free(...) = NULL" pattern for variables defined at
>  * the top of the function poses this potential interdependency problem
>  * the recommendation is to always define and assign variables in one
>  * statement and not group variable definitions at the top of the
>  * function when __free() is used.

This is really just a guideline.

>  *
>  * Lastly, given that the benefit of cleanup helpers is removal of
>  * "goto", and that the "goto" statement can jump between scopes, the
>  * expectation is that usage of "goto" and cleanup helpers is never
>  * mixed in the same function. I.e. for a given routine, convert all
>  * resources that need a "goto" cleanup to scope-based cleanup, or
>  * convert none of them.

The above has more to do with guard()s and not so much with a __free() at
the top of the function. The reason is because things get broken if a goto
jumps over a guard().

In other words, if you don't know what you are doing, don't mix them.

-- Steve