From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on archive.lwn.net X-Spam-Level: X-Spam-Status: No, score=-6.1 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham autolearn_force=no version=3.4.2 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by archive.lwn.net (Postfix) with ESMTP id C643A7D08A for ; Mon, 25 Mar 2019 13:49:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729057AbfCYNtu (ORCPT ); Mon, 25 Mar 2019 09:49:50 -0400 Received: from mail-pf1-f193.google.com ([209.85.210.193]:37459 "EHLO mail-pf1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728893AbfCYNtu (ORCPT ); Mon, 25 Mar 2019 09:49:50 -0400 Received: by mail-pf1-f193.google.com with SMTP id 8so6475474pfr.4 for ; Mon, 25 Mar 2019 06:49:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelfernandes.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=gEMxR3R8hBEpdUjHceXVmy1fI1OviFSo7Nzefk6Rk0c=; b=KfrrI3VpHzDfm+Fo6yJwhGo1KsoPzZdLadcmNAfepasR4k0Zoqf0byf/mXPV8y22EV xckeKuzr63x4zukHO9VmiNCxCAmyBWP4px9fYcjRPIkTZY1BBsFqVv/iYrqjorRj2Fcz Jp9WnLuu/hzw4wazOoNB6XyuJTKLA1hoptFeU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=gEMxR3R8hBEpdUjHceXVmy1fI1OviFSo7Nzefk6Rk0c=; b=TdBHxQFOAbVB8r/PpbT+lFL0DyJrt+8iDxEcc1+el7kMyqxCMKB6v4DhbLF1+rqkyb o/OfuY4P44CYOzcII1cW7jeLeDCjY5puSQOKWsAU2KeLyxXhV6eig2UCBhY7fN1Kmbx+ XPOkkar/CNVoJmkOttu3zCkervb7eoAU3UQfeUQQelRhY0wTKhiJXf35Kk2K+j93tUkV Ol81WKymwafBQfo7VsvG8P7wiFubp4o+hlVnlI3BwVvhrrR4KquV3OCuqhMu99V69P32 BRznSfEslw1zW/IKAo0lcOJWLUKbR5n2DaGRYcwyLdU8ahsLFk7ZmO6nR8SzPMLIdr6F Gf0w== X-Gm-Message-State: APjAAAURMyypH6rAvjz3vPCzObqr4/1bck8qz5aE4H7GOjXJf8sr6pww 8MtF75DKvXNzc4bJ2d9cYoqilg== X-Google-Smtp-Source: APXvYqzXcT4KS4Ahs0r/dMLNwVDljzWyaTnGeltOejYIVHFrWGFL/+7OX6BUZ1c9XSdoS7dHbQKf9w== X-Received: by 2002:a63:ca:: with SMTP id 193mr23340447pga.288.1553521789564; Mon, 25 Mar 2019 06:49:49 -0700 (PDT) Received: from localhost ([2620:15c:6:12:9c46:e0da:efbf:69cc]) by smtp.gmail.com with ESMTPSA id r86sm25637914pfa.82.2019.03.25.06.49.47 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 25 Mar 2019 06:49:48 -0700 (PDT) Date: Mon, 25 Mar 2019 09:49:47 -0400 From: Joel Fernandes To: Alexei Starovoitov Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Andrew Morton , ast@kernel.org, atishp04@gmail.com, dancol@google.com, Dan Williams , gregkh@linuxfoundation.org, Jonathan Corbet , karim.yaghmour@opersys.com, Kees Cook , linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Manoj Rao , Masahiro Yamada , paulmck@linux.vnet.ibm.com, "Peter Zijlstra (Intel)" , rdunlap@infradead.org, rostedt@goodmis.org, Shuah Khan , Thomas Gleixner , yhs@fb.com Subject: Re: [PATCH v2 1/2] Provide in-kernel headers for making it easy to extend the kernel Message-ID: <20190325134947.GA187133@google.com> References: <20190211143600.15021-1-joel@joelfernandes.org> <20190215031926.ljzluy2cfxp64u6o@ast-mbp> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190215031926.ljzluy2cfxp64u6o@ast-mbp> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org On Thu, Feb 14, 2019 at 07:19:29PM -0800, Alexei Starovoitov wrote: > 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? FYI, Masahiro's comments were all address by v5: https://lore.kernel.org/patchwork/project/lkml/list/?series=387311 I believe aren't more outstanding concerns. Could we consider it for v5.2? thanks, - Joel