linux-kernel - Re: [PATCH -next] init/Kconfig: fix unmet direct dependencies

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Date:   Wed, 28 Sep 2022 09:20:42 +0200
From:   Lukas Bulwahn <lukas.bulwahn@...il.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     Ren Zhijie <renzhijie2@...wei.com>, akpm@...ux-foundation.org,
        ndesaulniers@...gle.com, nathan@...nel.org, vbabka@...e.cz,
        masahiroy@...nel.org, arnd@...db.de, seanjc@...gle.com,
        hannes@...xchg.org, ojeda@...nel.org, mhiramat@...nel.org,
        dmitry.torokhov@...il.com, atomlin@...hat.com, ddiss@...e.de,
        christophe.leroy@...roup.eu, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] init/Kconfig: fix unmet direct dependencies

On Wed, Sep 28, 2022 at 9:01 AM Sebastian Andrzej Siewior
<bigeasy@...utronix.de> wrote:
>
> On 2022-09-28 06:49:34 [+0000], Ren Zhijie wrote:
> > --- a/init/Kconfig
> > +++ b/init/Kconfig
> > @@ -1273,6 +1273,7 @@ endif # NAMESPACES
> >
> >  config CHECKPOINT_RESTORE
> >       bool "Checkpoint/restore support"
> > +     select PROC_FS
>
> Couldn't this become a depends?
>

It could also be a depends (to resolve the warning).

It is just the question whether:

When PROC_FS is not set, should the CHECKPOINT_RESTORE still be
visible as a config option to add (and then automatically add
PROC_FS)? Then select is right here.

or:

When PROC_FS is not set, should the CHECKPOINT_RESTORE not be visible
as a config option to add? Instead the user first needs to add
PROC_FS, then CHECKPOINT_RESTORE becomes visible as an option to add,
and then the user can add it. Then depends would be right.

For me, both seem reasonable. So, I assume Ren considered select the
better choice.

But maybe Ren can confirm.

A kernel build configuration without PROC_FS is quite special
anyway... and then being interested in CHECKPOINT_ RESTORE for such a
system is really really special. I wonder if that user then really
knows what he or she is configuring at that point.

Lukas