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From:   Masahiro Yamada <masahiroy@kernel.org>
Date:   Fri, 24 Jun 2022 02:15:14 +0900
Message-ID: <CAK7LNAQ_4QUfBxRu2HpPS99Ay7JTcqFTHsrBmrPk+d8So5tjOQ@mail.gmail.com>
Subject: Re: [PATCH 0/2] Kconfig: -O3 enablement
To:     Miko Larsson <mikoxyzzz@gmail.com>
Cc:     Nick Desaulniers <ndesaulniers@google.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@kernel.org>,
        Nathan Chancellor <nathan@kernel.org>,
        Vlastimil Babka <vbabka@suse.cz>,
        Thomas Gleixner <tglx@linutronix.de>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Sean Christopherson <seanjc@google.com>,
        "Gustavo A. R. Silva" <gustavoars@kernel.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Chris Down <chris@chrisdown.name>,
        Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        John Ogness <john.ogness@linutronix.de>,
        Elliot Berman <quic_eberman@quicinc.com>,
        Oleksandr Natalenko <oleksandr@redhat.com>
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On Fri, Jun 24, 2022 at 2:00 AM Miko Larsson <mikoxyzzz@gmail.com> wrote:
>
> On Thursday, 23 June 2022 17:44:57 CEST Masahiro Yamada wrote:
> > On Fri, Jun 24, 2022 at 12:42 AM Miko Larsson <mikoxyzzz@gmail.com> wrote:
> > > On Wednesday, 22 June 2022 03:57:34 CEST Masahiro Yamada wrote:
> > > > If you want to say "use this option carefully",
> > > > EXPERT might be another option.
> > > >
> > > >     depends on ARC || EXPERT
> > >
> > > Yeah, this would be a fair compromise, though I think it would be
> > > better to use "visible if" instead of "depends on". I can get a v2 of
> > > the series together if this is desired.
> >
> > Why is "visible if" better than "depends on"?
> >
>
> Technically it most likely doesn't matter, but logically it makes more
> sense, since we'd make CC_OPTIMIZE_FOR_PERFORMANCE_O3 be visible if
> we're on ARC or if we have EXPERT enabled, instead of depending on
> them. But yeah, it probably doesn't matter.


Did you write and test the code?


"visible if" is only supported for "menu".
This is clearly documented at line 207
of Documentation/kbuild/kconfig-language.rst


Using "visible if" for config entry will just
result in the syntax error.


> --
> ~miko
>
>
>


--
Best Regards
Masahiro Yamada