From patchwork Sat Mar 26 23:53:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Masami Hiramatsu (Google)" X-Patchwork-Id: 12792695 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 242F4C433EF for ; Sat, 26 Mar 2022 23:53:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230114AbiCZXyw (ORCPT ); Sat, 26 Mar 2022 19:54:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54080 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229796AbiCZXyw (ORCPT ); Sat, 26 Mar 2022 19:54:52 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 68BA720F66; Sat, 26 Mar 2022 16:53:13 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0108360EB2; Sat, 26 Mar 2022 23:53:13 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 42134C340E8; Sat, 26 Mar 2022 23:53:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1648338792; bh=5G6+y4voRT6pv5UqQZ9GZx4exTKwS4ILxBmp+y5LBOQ=; h=From:To:Cc:Subject:Date:From; b=DcdjiBA+3SzHg4pxkcAAPTgWspF5lDIuAM27Sc2mm3EQvv9pg8HCabZAPedNrl9nK QQAOAyBhtHaCjKiGHnGwc7t1CpoZLahlOE8lb/ivNOWd6IbGKdseT0MmCCh6ZuxlFC 6oi+sIAGpHoDEPIzSn5tGSiDiZuFAywzVwfpxreR5i/9Y7BAjqdq6fc1N+yt72Ynej 7/T6kFfJjXathOk+5G9zu8PgHvB50Z9Uqm7lj7g47o7fr8CdJnEDzfIsoBSy4UwYdi UT6MTWcHMuSXUFBJ7IrR1PVupW887gL3kZQYH4Ty/HlSoFLeVrPze61FduR87rykki DSKam4Xvpr1ng== From: Masami Hiramatsu To: Steven Rostedt Cc: Masami Hiramatsu , Padmanabha Srinivasaiah , LKML , Jonathan Corbet , linux-doc@vger.kernel.org, Randy Dunlap , Nick Desaulniers , Sami Tolvanen , Nathan Chancellor , llvm@lists.linux.dev, Masahiro Yamada , Linux Kbuild mailing list Subject: [PATCH v4 0/3] bootconfig: Support embedding a bootconfig in kernel for non initrd boot Date: Sun, 27 Mar 2022 08:53:06 +0900 Message-Id: <164833878595.2575750.1483106296151574233.stgit@devnote2> X-Mailer: git-send-email 2.25.1 User-Agent: StGit/0.19 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org Hi, Here are the 4th version of the patchset to enable kernel embedded bootconfig for non-initrd kernel boot environment. I've fixed Makefile to determine update by checking the contents of embedding bootconfig file with filechk macro. Thanks Masahiro! Here is the previous version [1] (sorry, I missed to update the version tag in that series) [1] https://lore.kernel.org/all/164724890153.731226.1478494969800777757.stgit@devnote2/T/#u You can embed a bootconfig file into the kernel as a default bootconfig, which will be used if there is no initrd or no bootconfig is attached to initrd. This needs 2 options: CONFIG_EMBED_BOOT_CONFIG=y and set the file path to CONFIG_EMBED_BOOT_CONFIG_FILE. Even if you embed the bootconfig file to the kernel, it will not be enabled unless you pass "bootconfig" kernel command line option at boot. Moreover, since this is just a "default" bootconfig, you can override it with a new bootconfig if you attach another bootconfig to the initrd (if possible). CONFIG_EMBED_BOOT_CONFIG_FILE can take both absolute and relative path, but to simplify and make it independent from the build environment, I recommend you to use an absolute path for that. This is requested by Padmanabha at the below thread[2]; [2] https://lore.kernel.org/all/20220307184011.GA2570@pswork/T/#u KNOWN ISSUE: According to the report from Padmanabha[3], the embedded bootconfig data may not be updated if you do incremental build the kernel with CONFIG_LTO. This is under investigation. [3] https://lore.kernel.org/all/20220321183500.GA4065@pswork/T/#u Thank you, --- Masami Hiramatsu (3): bootconfig: Check the checksum before removing the bootconfig from initrd bootconfig: Support embedding a bootconfig file in kernel docs: bootconfig: Add how to embed the bootconfig into kernel Documentation/admin-guide/bootconfig.rst | 30 ++++++++++++++++++++++++++--- include/linux/bootconfig.h | 10 ++++++++++ init/Kconfig | 21 ++++++++++++++++++++ init/main.c | 31 +++++++++++++++--------------- lib/.gitignore | 1 + lib/Makefile | 10 ++++++++++ lib/bootconfig.c | 23 ++++++++++++++++++++++ 7 files changed, 108 insertions(+), 18 deletions(-) -- Masami Hiramatsu (Linaro)