linux-kernel - Re: [PATCH v2 1/2] Provide in-kernel headers for making it easy to extend the kernel

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Message-ID: <20190215031926.ljzluy2cfxp64u6o@ast-mbp>
Date:   Thu, 14 Feb 2019 19:19:29 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     "Joel Fernandes (Google)" <joel@...lfernandes.org>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>, ast@...nel.org,
        atishp04@...il.com, dancol@...gle.com,
        Dan Williams <dan.j.williams@...el.com>,
        gregkh@...uxfoundation.org, Jonathan Corbet <corbet@....net>,
        karim.yaghmour@...rsys.com, Kees Cook <keescook@...omium.org>,
        kernel-team@...roid.com, linux-doc@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        Manoj Rao <linux@...ojrajarao.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        paulmck@...ux.vnet.ibm.com,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        rdunlap@...radead.org, rostedt@...dmis.org,
        Shuah Khan <shuah@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>, yhs@...com
Subject: Re: [PATCH v2 1/2] Provide in-kernel headers for making it easy to
 extend the kernel

On Mon, Feb 11, 2019 at 09:35:59AM -0500, Joel Fernandes (Google) wrote:
> Introduce in-kernel headers and other artifacts which are made available
> as an archive through proc (/proc/kheaders.txz file). This archive makes
> it possible to build kernel modules, run eBPF programs, and other
> tracing programs that need to extend the kernel for tracing purposes
> without any dependency on the file system having headers and build
> artifacts.
> 
> On Android and embedded systems, it is common to switch kernels but not
> have kernel headers available on the file system. Raw kernel headers
> also cannot be copied into the filesystem like they can be on other
> distros, due to licensing and other issues. There's no linux-headers
> package on Android. Further once a different kernel is booted, any
> headers stored on the file system will no longer be useful. By storing
> the headers as a compressed archive within the kernel, we can avoid these
> issues that have been a hindrance for a long time.

The set looks good to me and since the main use case is building bpf progs
I can route it via bpf-next tree if there are no objections.
Masahiro, could you please ack it?