linux-kernel - Re: [PATCH] Documentation: kbuild: explain handling optional dependencies

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Date:   Fri, 15 Sep 2023 08:48:08 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Arnd Bergmann <arnd@...db.de>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Masahiro Yamada <masahiroy@...nel.org>
Cc:     Arnd Bergmann <arnd@...nel.org>, Jonathan Corbet <corbet@....net>,
        Sakari Ailus <sakari.ailus@....fi>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        linux-kbuild@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Documentation: kbuild: explain handling optional
 dependencies



On 9/15/23 00:44, Arnd Bergmann wrote:
> On Fri, Sep 15, 2023, at 09:34, Jani Nikula wrote:
>>
>> IS_REACHABLE() considered harmful.
> 

+1 absolutely.

> Absolutely agreed, and I'm sorry I introduced it in the
> first place in commit 9b174527e7b75 ("[media] Add and use
> IS_REACHABLE macro").
> 
> At the time, it was only used by drivers/media, which used
> to have a lot of open-coded instances of it and a lot of
> wrong checks.
> 
> Having a formal syntax for it was an improvement for
> drivers/media since it was more broken before, but it's
> usually a mistake to use it when there is another solution,
> and we probably should have tried harder to fix the
> dependencies in drivers/media at the time.
> 
>       Arnd

-- 
~Randy