linux-kernel - Re: [PATCH v5 1/3] Provide in-kernel headers to make extending kernel easier

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Message-ID: <20190415104109.64d914f3@gandalf.local.home>
Date:   Mon, 15 Apr 2019 10:41:09 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Olof Johansson <olof@...om.net>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Joel Fernandes <joelaf@...gle.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Qais Yousef <qais.yousef@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Manoj Rao <linux@...ojrajarao.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexei Starovoitov <ast@...nel.org>,
        atish patra <atishp04@...il.com>,
        Daniel Colascione <dancol@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <groeck@...omium.org>,
        Jonathan Corbet <corbet@....net>,
        Karim Yaghmour <karim.yaghmour@...rsys.com>,
        Kees Cook <keescook@...omium.org>,
        Android Kernel Team <kernel-team@...roid.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        linux-trace-devel@...r.kernel.org,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Shuah Khan <shuah@...nel.org>, Yonghong Song <yhs@...com>
Subject: Re: [PATCH v5 1/3] Provide in-kernel headers to make extending
 kernel easier

On Sun, 14 Apr 2019 12:38:34 -0700
Olof Johansson <olof@...om.net> wrote:

> >From my perspective, this is where we're at:  
> 
> This patch seems to have been met with a lot of responses in the tone
> of "this is not an appealing solution". Meanwhile, some of the
> suggested alternative solutions have not worked out, and we are now at
> a point where there's less interest in exploring alternatives and
> arguments to merge as-is with only minor adjustments.

Another consideration to make is difficulty of support. Having a
tarball compressed headers may not be an appealing solution, but it
isn't one that would be too much of an issue to support. Having a
better interface would be difficult to get right, and if you get it
wrong, you are now stuck with supporting something that may become a
big pain to do so in the future.

> I'd be a *lot* less hesitant if this went into debugfs or another
> location than /proc, which is one of the most regression-sensitive
> interfaces we have in the kernel.
> 

I agree with this assessment. We shouldn't use config.gz as precedence
for this solution. config.gz should have been in debugfs to begin with,
but I don't believe debugfs was around when config.gz was introduced.
(Don't have time to look into the history of the two).

-- Steve