linux-kernel - Re: [PATCH v1] init: Do not select DEBUG

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Message-ID: <CAGXu5j+uBuPjDc+gGcxW_QoJJi7sQZ8m=Zg-Q2wKDxyTt7yGvg@mail.gmail.com>
Date:   Wed, 10 Apr 2019 14:45:21 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Sinan Kaya <okaya@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Johannes Weiner <hannes@...xchg.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Adrian Reber <adrian@...as.de>,
        Richard Guy Briggs <rgb@...hat.com>
Subject: Re: [PATCH v1] init: Do not select DEBUG_KERNEL by default

On Wed, Apr 10, 2019 at 2:26 PM Sinan Kaya <okaya@...nel.org> wrote:
>
> We can't seem to have a kernel with CONFIG_EXPERT set but
> CONFIG_DEBUG_KERNEL unset these days.
>
> While some of the features under the CONFIG_EXPERT require
> CONFIG_DEBUG_KERNEL, it doesn't apply for all features.
>
> The meaning of CONFIG_EXPERT and CONFIG_DEBUG_KERNEL has been
> mixed here.

I don't agree: the point of EXPERT is to show _everything_, which
means DEBUG_KERNEL should be selected to show those options as well. I
think this is fine as-is. What is the problem you want to solve?

I think of it as low (nothing selected) medium (DEBUG_KERNEL) and high
(EXPERT and DEBUG_KERNEL). So EXPERT enables DEBUG_KERNEL too.

-- 
Kees Cook