Re: [RFC][PATCH] kconfig: Add implicit CONFIG_ prefix to IS_ENABLED() and co

Arnd Bergmann
2022-06-28T11:19:41Z

On Tue, Jun 28, 2022 at 11:56 AM Peter Zijlstra <peterz@infradead.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@infradead.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.

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