From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 92519C433E2 for ; Wed, 31 Mar 2021 03:06:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6D7C1619F6 for ; Wed, 31 Mar 2021 03:06:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233525AbhCaDFm (ORCPT ); Tue, 30 Mar 2021 23:05:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39254 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233306AbhCaDF0 (ORCPT ); Tue, 30 Mar 2021 23:05:26 -0400 Received: from mail-pf1-x42f.google.com (mail-pf1-x42f.google.com [IPv6:2607:f8b0:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2A3D0C061574 for ; Tue, 30 Mar 2021 20:05:26 -0700 (PDT) Received: by mail-pf1-x42f.google.com with SMTP id 11so13509006pfn.9 for ; Tue, 30 Mar 2021 20:05:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=m/po15KKRSlgR9dMseFbu3AQQQYqUEvH0rgXBtKR72E=; b=CYcIXIGTD9yJWnn5Rsh2SMMB+J87N8+w+xLJ2ExRUAALtSRtnPgkvw2GCpb68XXd0y VPfVN490C+RcYetJDTne8IVJ1O1wOoNUPtM3dIZ3Ot2EQdCzRPx5YTFangS4HHeKDvJZ MPAQbjDOLIl2oO6H2KlFul/4Up2QFTMJCBWBk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=m/po15KKRSlgR9dMseFbu3AQQQYqUEvH0rgXBtKR72E=; b=doxJV7DC3aQbQ9hptMr537rqW3ARsUdhxdpcvr1XFYVc7OG6cwEJj5I+pQxTUhQuz2 SLQDQ9WljAdNl7GXcAbD7IHP9PwL8WjlrieJiALd86o0rBmOQ2KJVvX1Rv5MBeXJa4ix /X+U0MdxkuF6cK86YEJlQuS6w+RGDRuUUyn6IWQy+xpnQpFcw0bVNX2Kg8SP5ooUOC8j wcNNEbZ0ABwBqChzDc4YYjNUGidf8+hDm4xl5CE0hJX3bd1Uz9vHTl1qjjyXcsHthDj4 roYKNN49CoYA2wfmVV+mcxToLaSaXgsPO6FXw72/rsl6ds/CwxfYiIuSE4VQxVKE1pDA Taew== X-Gm-Message-State: AOAM531o3ov3T6C9ZQP0EiESUM6DAd054pDka1tiYM0jBTKu+prsmZPV 0wgbtk274yQbUJVZpl+W1RmQmw== X-Google-Smtp-Source: ABdhPJy7vAg6Wk9iiMrbNn5lgd6eyr0aYiYRUK/DQNz5L+ETLAiEIGHSyR4AwU8VzD95aqZb/OLyMQ== X-Received: by 2002:a63:1706:: with SMTP id x6mr1106846pgl.362.1617159925748; Tue, 30 Mar 2021 20:05:25 -0700 (PDT) Received: from smtp.gmail.com ([2620:15c:202:201:c8c2:b814:df0f:253f]) by smtp.gmail.com with ESMTPSA id c6sm389024pfj.99.2021.03.30.20.05.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Mar 2021 20:05:25 -0700 (PDT) From: Stephen Boyd To: Andrew Morton Cc: linux-kernel@vger.kernel.org, Jiri Olsa , Alexei Starovoitov , Jessica Yu , Evan Green , Hsin-Yi Wang , Dave Young , Baoquan He , Vivek Goyal , kexec@lists.infradead.org Subject: [PATCH v3 02/12] buildid: Stash away kernels build ID on init Date: Tue, 30 Mar 2021 20:05:10 -0700 Message-Id: <20210331030520.3816265-3-swboyd@chromium.org> X-Mailer: git-send-email 2.31.0.291.g576ba9dcdaf-goog In-Reply-To: <20210331030520.3816265-1-swboyd@chromium.org> References: <20210331030520.3816265-1-swboyd@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Parse the kernel's build ID at initialization so that other code can print a hex format string representation of the running kernel's build ID. This will be used in the kdump and dump_stack code so that developers can easily locate the vmlinux debug symbols for a crash/stacktrace. Cc: Jiri Olsa Cc: Alexei Starovoitov Cc: Jessica Yu Cc: Evan Green Cc: Hsin-Yi Wang Cc: Dave Young Cc: Baoquan He Cc: Vivek Goyal Cc: Signed-off-by: Stephen Boyd --- include/linux/buildid.h | 3 +++ init/main.c | 1 + lib/buildid.c | 17 +++++++++++++++++ 3 files changed, 21 insertions(+) diff --git a/include/linux/buildid.h b/include/linux/buildid.h index ebce93f26d06..0312660089c3 100644 --- a/include/linux/buildid.h +++ b/include/linux/buildid.h @@ -10,4 +10,7 @@ int build_id_parse(struct vm_area_struct *vma, unsigned char *build_id, __u32 *size); int build_id_parse_buf(const void *buf, unsigned char *build_id, u32 buf_size); +extern unsigned char vmlinux_build_id[]; +void init_vmlinux_build_id(void); + #endif diff --git a/init/main.c b/init/main.c index 53b278845b88..eaede2f41327 100644 --- a/init/main.c +++ b/init/main.c @@ -857,6 +857,7 @@ asmlinkage __visible void __init __no_sanitize_address start_kernel(void) set_task_stack_end_magic(&init_task); smp_setup_processor_id(); debug_objects_early_init(); + init_vmlinux_build_id(); cgroup_init_early(); diff --git a/lib/buildid.c b/lib/buildid.c index 010ab0674cb9..b939bbc59233 100644 --- a/lib/buildid.c +++ b/lib/buildid.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 #include +#include #include #include #include @@ -171,3 +172,19 @@ int build_id_parse_buf(const void *buf, unsigned char *build_id, u32 buf_size) { return parse_build_id_buf(build_id, NULL, buf, buf_size); } + +unsigned char vmlinux_build_id[BUILD_ID_SIZE_MAX] __ro_after_init; + +/** + * init_vmlinux_build_id - Get the running kernel's build ID + * + * Return: Running kernel's build ID + */ +void __init init_vmlinux_build_id(void) +{ + extern const void __start_notes __weak; + extern const void __stop_notes __weak; + unsigned int size = &__stop_notes - &__start_notes; + + build_id_parse_buf(&__start_notes, vmlinux_build_id, size); +} -- https://chromeos.dev