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 D18E2C43461 for ; Sat, 10 Apr 2021 01:53:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A990D61182 for ; Sat, 10 Apr 2021 01:53:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234167AbhDJBxZ (ORCPT ); Fri, 9 Apr 2021 21:53:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36048 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234026AbhDJBxU (ORCPT ); Fri, 9 Apr 2021 21:53:20 -0400 Received: from mail-pf1-x433.google.com (mail-pf1-x433.google.com [IPv6:2607:f8b0:4864:20::433]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7BD43C061762 for ; Fri, 9 Apr 2021 18:53:05 -0700 (PDT) Received: by mail-pf1-x433.google.com with SMTP id s11so5397243pfm.1 for ; Fri, 09 Apr 2021 18:53:05 -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=EVxXeOc0hKsCQhtdNSOBYITwGo/IIl7F5oIkiSC5GNA=; b=M2v490r7nGzxPyOhiB85EUVIhWJs5kaRQOHRQNfjHCLbu4fDzn7mvOqQ+j5zc8k3EL DF4PxmHTF4EiMFwexSv5Ja8Sl4T14aTCfK3ERIGDg98Oq8hsIa6qkvkjSN9CfgM+BLFi paUyavdwwNqw0NuVeNrLRT8co6F5mi5HFrliI= 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=EVxXeOc0hKsCQhtdNSOBYITwGo/IIl7F5oIkiSC5GNA=; b=H8oHJitOV72Qc1dvBHdx3HJA3DtAAfTzth9nyMF/oWJztIqnbm8Tq+mgOv4E/IOGRG SYSomN2eFmmcjvqDsz1Ky+a3PfYZJbgIjh9tHN1kIop3rL9MiuH8SYuW3p1ksr0vEkrC IyXGO08A/NmFHZdwzeP+1lThuaTHAHlkwreo8t/K9r9X6T+rbZWacliJvhvdPH/RYNlB R6Jezoo8q0c+GRQLQsqXpUovb5dhESWW1pRuqrrCniTmQxSKs1lPTSb5nxFmxEZdU3MH rn2gul4BbY3EyxQo6EchRwWSLNkmF3pMTBsCWcF5ecpDlmHOR3AfgtAPm/xmijUCs8PP zhrQ== X-Gm-Message-State: AOAM530QwqY2394OuXRPqZHP7ulE5PfME8SYY9ajUxVclk0lfHC0zzqj EzIuVO2uFtObIuVi45O8gqM4yw== X-Google-Smtp-Source: ABdhPJwaZhoYUK02GvtHfsIGZjAia1+izxqV/KVJMQN+YTVp46ZVr1YSRjXk8BY8I88BOFVNU7ZAug== X-Received: by 2002:a63:356:: with SMTP id 83mr15913879pgd.344.1618019584525; Fri, 09 Apr 2021 18:53:04 -0700 (PDT) Received: from smtp.gmail.com ([2620:15c:202:201:5141:7881:7013:743b]) by smtp.gmail.com with ESMTPSA id n23sm3837962pgl.49.2021.04.09.18.53.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Apr 2021 18:53:04 -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 v4 03/13] buildid: Stash away kernels build ID on init Date: Fri, 9 Apr 2021 18:52:50 -0700 Message-Id: <20210410015300.3764485-4-swboyd@chromium.org> X-Mailer: git-send-email 2.31.1.295.g9ea45b61b8-goog In-Reply-To: <20210410015300.3764485-1-swboyd@chromium.org> References: <20210410015300.3764485-1-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 | 15 +++++++++++++++ 3 files changed, 19 insertions(+) diff --git a/include/linux/buildid.h b/include/linux/buildid.h index ebce93f26d06..f375900cf9ed 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[BUILD_ID_SIZE_MAX]; +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 6aea1c4e5e85..1103ed46214f 100644 --- a/lib/buildid.c +++ b/lib/buildid.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 #include +#include #include #include #include @@ -172,3 +173,17 @@ 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 - Compute and stash the 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