From patchwork Wed Apr 12 23:49:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Josh Poimboeuf X-Patchwork-Id: 13209651 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2021AC77B76 for ; Wed, 12 Apr 2023 23:50:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229647AbjDLXuB (ORCPT ); Wed, 12 Apr 2023 19:50:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45508 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229536AbjDLXuA (ORCPT ); Wed, 12 Apr 2023 19:50:00 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A94B45B88; Wed, 12 Apr 2023 16:49:59 -0700 (PDT) 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 3592B63A2A; Wed, 12 Apr 2023 23:49:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 21006C433A0; Wed, 12 Apr 2023 23:49:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1681343398; bh=4fYa0NLrdkGVjoVOTJdz3b/WtV2GBidYTUmLc/xH2+I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eb3JlSsHUpXn9NWH/xcny+gA4O7DsRrGM/dCAIAIviMjfao8xf/SlwdBdiLHbXRJD Ijd0uQwdFKuXNBWlHDlGK7DkdMvB5h1/wy9A5I39eqQKn256zr9ggEQeUVVMIac6Zl 0pgt9cfERHEYDdVJiZCfxSQhPh2InZA3U86BtOOqqz0O6wNoI7aJZtV4tQk/sWd1P7 AgIsR8zRaJB80FfTxS/dVbRVdU9GThw6tVW7vDLvePrBBgzWMNftB8ZZkmmGX4d6CF Ke6ueda2/eWzmVHkYuNKv2dcZMuBt5GKcCf4qRhIRHzwdWNpk1ItMAB4+0HxRJoKpC venRWAE2t1TQQ== From: Josh Poimboeuf To: x86@kernel.org Cc: linux-kernel@vger.kernel.org, Peter Zijlstra , Miroslav Benes , linux-btrfs@vger.kernel.org, Mark Rutland , linux-scsi@vger.kernel.org, linux-hyperv@vger.kernel.org, Arnd Bergmann , "Guilherme G . Piccoli" , Michael Kelley , Nick Desaulniers , Nathan Chancellor Subject: [PATCH v2 01/11] init: Mark [arch_call_]rest_init() __noreturn Date: Wed, 12 Apr 2023 16:49:31 -0700 Message-Id: <7194ed8a989a85b98d92e62df660f4a90435a723.1681342859.git.jpoimboe@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: References: MIME-Version: 1.0 Content-type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org In preparation for improving objtool's handling of weak noreturn functions, mark start_kernel(), arch_call_rest_init(), and rest_init() __noreturn. Reviewed-by: Nick Desaulniers 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 8ec5cdf9dadc..4259b6c50516 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -396,7 +396,7 @@ 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 4425d1783d5c..161ed956d738 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 cae6ac6ff246..e7442e7ad676 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -202,6 +202,7 @@ 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", "arch_cpu_idle_dead", "cpu_bringup_and_idle", "cpu_startup_entry", @@ -217,6 +218,7 @@ 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",