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 792EAC433ED for ; Tue, 20 Apr 2021 21:50:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 41FAC61411 for ; Tue, 20 Apr 2021 21:50:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234213AbhDTVuo (ORCPT ); Tue, 20 Apr 2021 17:50:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36386 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234185AbhDTVuj (ORCPT ); Tue, 20 Apr 2021 17:50:39 -0400 Received: from mail-pl1-x62b.google.com (mail-pl1-x62b.google.com [IPv6:2607:f8b0:4864:20::62b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 77EA1C06138A for ; Tue, 20 Apr 2021 14:50:07 -0700 (PDT) Received: by mail-pl1-x62b.google.com with SMTP id y1so4780582plg.11 for ; Tue, 20 Apr 2021 14:50:07 -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=azPum2fPL7aelLx2spTQSlX7pdpba69xRaN/kunkA8tQkrDHdVazyKsB3WRbKcrYZd AS6fP54ZpuPwitQ/0xTbrzNfN0j2g1g8RuLEX1C5lZqr0jFElocJDOFNouGnC+zDtlAz 7BuuS+n18fIdOoOYE7uTkRtp7k0GontguAp7E= 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=iy3Y5elCn9rdMc0P2nztQBuN29GzWhayp+xG9KoEamGwJH3mIUaOeiNtWHyYzVgA7a I/wzyjApY7s1IEENn1hW93WZ1vE2BZ2gSU8N370Qc/hWdNU29iODfIjaQl5AiIVISHA4 SiXm4KmX5ui9rgeJ3+vaBGzVSFzUZWjzlvH9bC3YFDAhsqezNJ4d7K1b+CxmCVTyoPyd GnSE1i86lvmJSu6j3xGW7QMGGvhXYUm3z/i09zEQetbhCA6+PhwXGgGNnSAIQtCCW41r cFj4ljW5uqUpv2jOsigMJWpekVECYMOUhdBs7351Csq9Z0eq6fr8JGftPTbd8UNJ23V8 jBPA== X-Gm-Message-State: AOAM531S6dL53iuqssCz83G10M2kwp0WXeNlYF822J8qDa7wgxyQQBMH NSsg3W3X6b0SkYu/azep8FXcb8z1Lw/bdQ== X-Google-Smtp-Source: ABdhPJwO5/kNk6qBtU/RCnpv5ysH8jwwJruoestnWb2e9/CAPNCghp7IL+FfCj0FMcSRWncva2Dbtg== X-Received: by 2002:a17:902:d884:b029:ec:9fcd:2311 with SMTP id b4-20020a170902d884b02900ec9fcd2311mr14258092plz.80.1618955407110; Tue, 20 Apr 2021 14:50:07 -0700 (PDT) Received: from smtp.gmail.com ([2620:15c:202:201:bf8b:4b8b:2315:3719]) by smtp.gmail.com with ESMTPSA id c21sm31481pfo.91.2021.04.20.14.50.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Apr 2021 14:50:06 -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 v5 03/13] buildid: Stash away kernels build ID on init Date: Tue, 20 Apr 2021 14:49:53 -0700 Message-Id: <20210420215003.3510247-4-swboyd@chromium.org> X-Mailer: git-send-email 2.31.1.368.gbe11c130af-goog In-Reply-To: <20210420215003.3510247-1-swboyd@chromium.org> References: <20210420215003.3510247-1-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