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

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Message-ID: <CAEXW_YS=C8FkC1h4ZQ6_jX8jY==Xe66c+q9cgM=Ci+N7SyNz6w@mail.gmail.com>
Date:   Tue, 16 Apr 2019 13:22:38 -0400
From:   Joel Fernandes <joel@...lfernandes.org>
To:     Olof Johansson <olof@...om.net>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Karim Yaghmour <karim.yaghmour@...rsys.com>,
        Kees Cook <keescook@...omium.org>,
        Joel Fernandes <joelaf@...gle.com>,
        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>,
        Guenter Roeck <groeck@...omium.org>,
        Jonathan Corbet <corbet@....net>,
        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 Tue, Apr 16, 2019 at 12:57 PM Olof Johansson <olof@...om.net> wrote:
[snip]
> > Where kheaders.tar.xz is placed doesn't really matter.
> > /proc or /sys/kernel makes no real difference.
>
> If done in a location that isn't a perpetual ABI commitment, a tarball
> solution is something we can work with.

This is the part I don't get, Olof. It has to be an ABI commitment so
that the tools always work. Why are we so interested in breaking
userspace tools? We want a robust solution, not a fragile one.

thanks,

 - Joel