From patchwork Tue Feb 14 07:05:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Josh Poimboeuf X-Patchwork-Id: 56722 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:adf:eb09:0:0:0:0:0 with SMTP id s9csp2811584wrn; Mon, 13 Feb 2023 23:10:57 -0800 (PST) X-Google-Smtp-Source: AK7set8Ctvo1SRy7So0ei/f4ASaqa6jEtrOsLHXsdpFlu/4hhI+p6MkXwlbj9WJZTy5mc1YuAcLt X-Received: by 2002:a17:907:a4e:b0:885:5682:7e52 with SMTP id be14-20020a1709070a4e00b0088556827e52mr2348681ejc.13.1676358657184; Mon, 13 Feb 2023 23:10:57 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1676358657; cv=none; d=google.com; s=arc-20160816; b=w35TWA7YiDKz0PdhO+NNsvfbNpT56GlmPgXyGuDo9ia+48CKQ1ULN2VgP0a5slarg2 e+57cfVQTPBfgOu8vfc2nyhaVwIIYRhT8f7FavIHTYhmNBkwGl0RbaNhaPgkT9850lud Bx4HwmDWhEgU0BDVCEMJyW/Evwt/zd9y20m98yx2SvPH7Dwf5wTrEcgIeDkncDORqaH1 KmFn5Y42WR3WlTIF+X1RlB9H2DpfEgbiRyPU8rhvsIFpXRtowjL+uwxSEdI+oPZwX9e9 7Cyn19rnH7m48jSPqZ8xfFBcXopWHllRX0VxkdljwcTSSGF0EmvVwgkhhJIc6tRb5hwQ 6+nw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=c3yxKEJD5w//08K15nyObJ1IqwRxqrJLxR00zxIpvaI=; b=HnxxRysVzx+9DuQj8ResvyAlPYQE5KbiWwH7Ex8hNG9GOyBZqh1wy6tbj/eFqfKrOl fruWXvXfKVjcxb8NfsxZq+OEoOjWKVwJnGJ6V8ySDz4hN8SqmdRg0D6iY+viDc5sAYla nCF0jnACvrlUciAPghwNgKaRnmGE2k0rY3N3Czwd66hUDeKWf9VSvEp8V95i9sD9oDE/ QtqBACunShQjYwBJsFg320UU2tz+zqVr1lC0JVSK6tlLvNzSaCT9MR4/Hx/iOeAIuPte sB2WjDVMvdAYBTklrM98l91VfKqCvPp13948+hMmIJpG0ZmUMMUvZPnqdv/pJZZFNx0Z b7MQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b="eAVhDP/n"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id n30-20020a17090673de00b0087bd3f0b97asi17145019ejl.637.2023.02.13.23.10.33; Mon, 13 Feb 2023 23:10:57 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b="eAVhDP/n"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232167AbjBNHJ4 (ORCPT + 99 others); Tue, 14 Feb 2023 02:09:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53082 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231851AbjBNHIL (ORCPT ); Tue, 14 Feb 2023 02:08:11 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 647621F919; Mon, 13 Feb 2023 23:07:32 -0800 (PST) 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 DCED561486; Tue, 14 Feb 2023 07:07:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 99164C433EF; Tue, 14 Feb 2023 07:07:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1676358451; bh=/E6ppJbV5z5ApVdewyuTHf7CvoK0nTKINkqTWba4hWQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eAVhDP/nnUmK2Tbt0WlSlbeLwZc48daDDUfA+WcRQcgABUpHOLC4W6mRlYkn3B0wb pyPJkCGDfhtKyYAAyB7i0WULfwtLfuoylAXfq26jq+r6cd9pmJTf8Y7Sdz9uNbPFGD K42IQuFDnlwzEU/X635kfqpIVB/BjhOS6kor7Lo+J8wO3PWI6MUZksGoZIin9FsGib dDZLKpP0ITxkWimDoJJt9mabyqo+rPT12nL/g6KtsdX0FQq3IFPm3DMc246TJwAe8b RoULbiJpr7jsVWWMB2lWHrmGsaLZlzYGOxbtkqHjzyKdQQj7sniVYEyt3W2dldlRvs MuPWVOv6ThwRg== From: Josh Poimboeuf To: linux-kernel@vger.kernel.org Cc: jgross@suse.com, richard.henderson@linaro.org, ink@jurassic.park.msu.ru, mattst88@gmail.com, linux-alpha@vger.kernel.org, linux@armlinux.org.uk, linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com, will@kernel.org, guoren@kernel.org, linux-csky@vger.kernel.org, linux-ia64@vger.kernel.org, chenhuacai@kernel.org, kernel@xen0n.name, loongarch@lists.linux.dev, f.fainelli@gmail.com, bcm-kernel-feedback-list@broadcom.com, tsbogend@alpha.franken.de, linux-mips@vger.kernel.org, jiaxun.yang@flygoat.com, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, linuxppc-dev@lists.ozlabs.org, ysato@users.sourceforge.jp, dalias@libc.org, linux-sh@vger.kernel.org, davem@davemloft.net, sparclinux@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, chris@zankel.net, jcmvbkbc@gmail.com, linux-xtensa@linux-xtensa.org, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, paulmck@kernel.org Subject: [PATCH v2 23/24] init: Make arch_call_rest_init() and rest_init() __noreturn Date: Mon, 13 Feb 2023 23:05:57 -0800 Message-Id: <8e901950d98b940972920578654ce186b714e74b.1676358308.git.jpoimboe@kernel.org> X-Mailer: git-send-email 2.39.1 In-Reply-To: References: MIME-Version: 1.0 Content-type: text/plain X-Spam-Status: No, score=-7.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1757789455305316613?= X-GMAIL-MSGID: =?utf-8?q?1757789455305316613?= arch_call_rest_init() and rest_init() don't return. Annotate them as such. Fixes the following warning: init/main.o: warning: objtool: start_kernel+0x4ad: unreachable instruction Signed-off-by: Josh Poimboeuf --- arch/s390/kernel/setup.c | 2 +- include/linux/start_kernel.h | 4 ++-- init/main.c | 4 ++-- tools/objtool/check.c | 2 ++ 4 files changed, 7 insertions(+), 5 deletions(-) diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index 696c9e007a36..85abff362f29 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -393,7 +393,7 @@ int __init arch_early_irq_init(void) return 0; } -void __init arch_call_rest_init(void) +void __init __noreturn arch_call_rest_init(void) { unsigned long stack; diff --git a/include/linux/start_kernel.h b/include/linux/start_kernel.h index 8b369a41c03c..864921e54c92 100644 --- a/include/linux/start_kernel.h +++ b/include/linux/start_kernel.h @@ -9,7 +9,7 @@ up something else. */ extern asmlinkage void __init start_kernel(void); -extern void __init arch_call_rest_init(void); -extern void __ref rest_init(void); +extern void __init __noreturn arch_call_rest_init(void); +extern void __ref __noreturn rest_init(void); #endif /* _LINUX_START_KERNEL_H */ diff --git a/init/main.c b/init/main.c index e1c3911d7c70..ef71a9902e47 100644 --- a/init/main.c +++ b/init/main.c @@ -683,7 +683,7 @@ static void __init setup_command_line(char *command_line) static __initdata DECLARE_COMPLETION(kthreadd_done); -noinline void __ref rest_init(void) +noinline void __ref __noreturn rest_init(void) { struct task_struct *tsk; int pid; @@ -889,7 +889,7 @@ static int __init early_randomize_kstack_offset(char *buf) early_param("randomize_kstack_offset", early_randomize_kstack_offset); #endif -void __init __weak arch_call_rest_init(void) +void __init __weak __noreturn arch_call_rest_init(void) { rest_init(); } diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 0a1cf867d9b2..f79baae3e338 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -167,6 +167,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func, "__reiserfs_panic", "__stack_chk_fail", "__ubsan_handle_builtin_unreachable", + "arch_call_rest_init", "cpu_bringup_and_idle", "cpu_startup_entry", "do_exit", @@ -181,6 +182,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func, "machine_real_restart", "make_task_dead", "panic", + "rest_init", "rewind_stack_and_make_dead", "sev_es_terminate", "snp_abort",