linux-kernel - Re: [RFC][PATCH] kconfig: Add implicit CONFIG_ prefix to IS

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Date:   Tue, 28 Jun 2022 10:24:59 -0400
From:   Paul Gortmaker <paul.gortmaker@...driver.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Masahiro Yamada <masahiroy@...nel.org>, mmarek@...e.cz,
        Mike Rapoport <rppt@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH] kconfig: Add implicit CONFIG_ prefix to
 IS_ENABLED() and co

[Re: [RFC][PATCH] kconfig: Add implicit CONFIG_ prefix to IS_ENABLED() and co] On 28/06/2022 (Tue 13:19) Arnd Bergmann wrote:

> On Tue, Jun 28, 2022 at 11:56 AM Peter Zijlstra <peterz@...radead.org> wrote:
> >
> > Since IS_ENABLED() (and friends) are clearly meant to be used on
> > CONFIG_foo symbols and IS_ENABLED(CONFIG_ is so long and almost an
> > tautology, allow the more compact usage of: IS_ENABLED(foo).
> >
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> 
> I'd prefer to keep the more verbose usage, mainly because it makes it easier
> to grep for a symbol. If today you do 'git grep CONFIG_PM_SLEEP', you find
> all instances in Makefile, in #ifdef and in IS_ENABLED(), though not the
> references in Kconfig language, which leave out the prefix.

TL;DR - me too.

I confess that I do the same thing - I grep for CONFIG_FOO to find the
consumers, and "config FOO" to find the provider.

So while I can appreciate the value of removing verbosity, this will
impact workflows of average people out there.

Doing a grep for "PCI" is practically worthless.  Having to grep for
both CONFIG_PCI and IS_ENABLED\(PCI will inevitably annoy people when
they realize they missed a code path needing an update because they only
searched for the former.

Paul.
--

> 
> If we remove the prefix for IS_ENABLED(), the same grep fails to get
> all the results, while searching for the substring without the CONFIG_
> prefix can end up finding false-positives by finding longer strings (e.g.
> CONFIG_DEBUG_STACKOVERFLOW vs
> CONFIG_HAVE_DEBUG_STACKOVERFLOW).
> 
>        Arnd