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

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Message-ID: <0412bd8a-aa49-e2b1-ed9f-57ad37ecea19@huawei.com>
Date:   Thu, 29 Sep 2022 14:48:46 +0800
From:   Ren Zhijie <renzhijie2@...wei.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        "Vlastimil Babka" <vbabka@...e.cz>,
        Masahiro Yamada <masahiroy@...nel.org>, <seanjc@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>, <ojeda@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        <atomlin@...hat.com>, <ddiss@...e.de>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] init/Kconfig: fix unmet direct dependencies


在 2022/9/28 17:32, Arnd Bergmann 写道:
> On Wed, Sep 28, 2022, at 11:14 AM, Sebastian Andrzej Siewior wrote:
>> On 2022-09-28 09:20:42 [+0200], Lukas Bulwahn wrote:
>>>> 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.
>> then CHECKPOINT_RESTORE is the only option selecting PROC_FS while
>> everyone else depends on it _or_ avoids using it in the absence of
>> PROC_FS.
> Right, we should not mix 'select' and 'depends on' for the same
> symbol, as that leads to circular dependencies and general
> confusion.
>
> If there is no way to use CHECKPOINT_RESTORE without procfs,
> then the symbol should just not be visible (it will still show
> up with the dependency when one searches in menuconfig).
> Force-enabling a major subsystem like procfs from another
> symbol is not a good solution.

Agree that,  i will fix it in patch v2.

Thanks,

Ren

>      Arnd
> .