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

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Date:   Tue, 28 Jun 2022 14:01:31 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Masahiro Yamada <masahiroy@...nel.org>, mmarek@...e.cz,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        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

On Tue, Jun 28, 2022 at 01:19:17PM +0200, 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.

Which is why I never grep for the CONFIG_ thing to begin with, it misses
the Kconfig site.

> 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).

Me being used to that doesn't consider that a real issue :-) I'd much
rather have the somewhat shorter IS_ENABLED() things.