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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 6E733C07E9E for ; Thu, 8 Jul 2021 01:09:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 59B5A61CDA for ; Thu, 8 Jul 2021 01:09:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230123AbhGHBL4 (ORCPT ); Wed, 7 Jul 2021 21:11:56 -0400 Received: from mail.kernel.org ([198.145.29.99]:52030 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230111AbhGHBL4 (ORCPT ); Wed, 7 Jul 2021 21:11:56 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id DA57461CD9; Thu, 8 Jul 2021 01:09:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1625706554; bh=ca7ZImwfVHz88xDeO01M4RQiuIK/wsfCMv4xDj31L/k=; h=Date:From:To:Subject:In-Reply-To:From; b=Uwz/u+Uh7HaPJodPGI5x7qe+qpezenCrUtD5AUKwhj4LmfnqlIdMfcqVvymjPegAg oSpNFKeLEI+9pTz2Ei0aW5qYczM32wcU9KNss7mbvBHBne9K1fHUAlgrOlTbIoES4q Lnn20sHFLkr66rPIWzDqrxpmrQfVcWs6GjCibgpg= Date: Wed, 07 Jul 2021 18:09:13 -0700 From: Andrew Morton To: akpm@linux-foundation.org, andriy.shevchenko@linux.intel.com, ast@kernel.org, bhe@redhat.com, bp@alien8.de, catalin.marinas@arm.com, dyoung@redhat.com, evgreen@chromium.org, hsinyi@chromium.org, jeyu@kernel.org, jolsa@kernel.org, khlebnikov@yandex-team.ru, linux-mm@kvack.org, linux@rasmusvillemoes.dk, mingo@redhat.com, mm-commits@vger.kernel.org, pmladek@suse.com, rostedt@goodmis.org, sashal@kernel.org, sergey.senozhatsky@gmail.com, swboyd@chromium.org, tglx@linutronix.de, torvalds@linux-foundation.org, vgoyal@redhat.com, will@kernel.org, willy@infradead.org Subject: [patch 33/54] buildid: stash away kernels build ID on init Message-ID: <20210708010913.9QJXJoDJ6%akpm@linux-foundation.org> In-Reply-To: <20210707175950.eceddb86c6c555555d4730e2@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: Stephen Boyd Subject: buildid: stash away kernels build ID on init 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. [swboyd@chromium.org: fix implicit declaration of init_vmlinux_build_id()] Link: https://lkml.kernel.org/r/CAE-0n51UjTbay8N9FXAyE7_aR2+ePrQnKSRJ0gbmRsXtcLBVaw@mail.gmail.com Link: https://lkml.kernel.org/r/20210511003845.2429846-4-swboyd@chromium.org Signed-off-by: Stephen Boyd Acked-by: Baoquan He Cc: Jiri Olsa Cc: Alexei Starovoitov Cc: Jessica Yu Cc: Evan Green Cc: Hsin-Yi Wang Cc: Dave Young Cc: Vivek Goyal Cc: Andy Shevchenko Cc: Borislav Petkov Cc: Catalin Marinas Cc: Ingo Molnar Cc: Konstantin Khlebnikov Cc: Matthew Wilcox Cc: Petr Mladek Cc: Rasmus Villemoes Cc: Sasha Levin Cc: Sergey Senozhatsky Cc: Steven Rostedt Cc: Thomas Gleixner Cc: Will Deacon Signed-off-by: Andrew Morton --- include/linux/buildid.h | 3 +++ init/main.c | 2 ++ lib/buildid.c | 15 +++++++++++++++ 3 files changed, 20 insertions(+) --- a/include/linux/buildid.h~buildid-stash-away-kernels-build-id-on-init +++ a/include/linux/buildid.h @@ -10,4 +10,7 @@ int build_id_parse(struct vm_area_struct __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 --- a/init/main.c~buildid-stash-away-kernels-build-id-on-init +++ a/init/main.c @@ -45,6 +45,7 @@ #include #include #include +#include #include #include #include @@ -913,6 +914,7 @@ asmlinkage __visible void __init __no_sa set_task_stack_end_magic(&init_task); smp_setup_processor_id(); debug_objects_early_init(); + init_vmlinux_build_id(); cgroup_init_early(); --- a/lib/buildid.c~buildid-stash-away-kernels-build-id-on-init +++ a/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, { 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); +} _