linux-kernel - Re: [PATCH 5/6] kconfig: require an exact match for "is not set" to disable CONFIG option

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Date:   Sun, 19 Nov 2023 19:02:05 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6] kconfig: require an exact match for "is not set" to
 disable CONFIG option

On Sun, Nov 19, 2023 at 1:30 AM Randy Dunlap <rdunlap@...radead.org> wrote:
>
> Hi,
>
> On 11/17/23 23:59, Masahiro Yamada wrote:
> > Currently, any string starting "is not set" disables a CONFIG option.
> >
> > For example, "# CONFIG_FOO is not settled down" is accepted as valid
> > input, functioning the same as "# CONFIG_FOO is not set". It is a
> > long-standing oddity.
> >
> > Check the line against the exact pattern "is not set".
> >
>
> Just to confirm (I hope), using:
> CONFIG_FOO=n
>
> will also still work to disable that config option?



Yes.  =n is still supported.


The code diff is
strncmp() -> strcmp().






> Thanks.
>
> > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> > ---
> >
> >  scripts/kconfig/confdata.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
> > index 795ac6c9378f..958be12cd621 100644
> > --- a/scripts/kconfig/confdata.c
> > +++ b/scripts/kconfig/confdata.c
> > @@ -454,7 +454,7 @@ int conf_read_simple(const char *name, int def)
> >                       if (!p)
> >                               continue;
> >                       *p++ = 0;
> > -                     if (strncmp(p, "is not set", 10))
> > +                     if (strcmp(p, "is not set"))
> >                               continue;
> >
> >                       val = "n";
>
> --
> ~Randy



-- 
Best Regards
Masahiro Yamada