From patchwork Fri Feb 3 22:05:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Josh Poimboeuf X-Patchwork-Id: 52682 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:adf:eb09:0:0:0:0:0 with SMTP id s9csp1080491wrn; Fri, 3 Feb 2023 14:08:41 -0800 (PST) X-Google-Smtp-Source: AK7set+aAnmpoxcKhLUU3beKzQUjIuOq2k+VYd5lqTR61aZLcff/MxIMGkH91NjrDuMC56rZN51w X-Received: by 2002:a62:1dc2:0:b0:592:4502:fb0 with SMTP id d185-20020a621dc2000000b0059245020fb0mr10940504pfd.0.1675462120877; Fri, 03 Feb 2023 14:08:40 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1675462120; cv=none; d=google.com; s=arc-20160816; b=iNgcErg0SaJKmCsbX0j4Mt/tZHbgcWhYEIJn7C+6WUUsXx9N08VpRc7uoT0E+osE4r S5D2/CyRnJVr3vuphnj5DnQGgR00kvHjk2EeV9De40qtfbj3hbCZv0+/hq6uCT+MpXvc r/erfSwJo5dHKUun+lXOE5kfjxKAuqg6T+GBAOdgsdzdAZzmPaXv8s/bwagA2UKMW2vc eOSf3p1vqMvM1hz2zpTZjKqz+tA514wYiwE+JW86uVmk5zrRNe/vz3xLcxEP26pvXSLa ykuT6iPX4C+3wRnKtnReEU1t+THZu1OipUqYS3EXw6rJ6EOHNYPdRnhCSEyBsBpcbXOu 87Sw== 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=hlV1IOqgC/IRgshViIND178CsmpcnlF2zLWoTjFMsPk=; b=cUGXFox/C4blhX0AySMV5W9nIFqhBBzBK0BWdyKDHWguarDNkZkFgeIRiEJSwcV6fd CcQbCLIhhAVnphkr4EQeTImYhuE5zW3IxlpLPEngQr2w8n0Phxd8pKfEUoSAcUPsAUZm wL8u//yQw2KqJM/lpIq/+JoCmsmKR9bpiILkw8XkxGFRMuGKg+67S05APDIFXod77+eL 2yyjuLeyhBpUjJt200ZW774nuiSQzi2NevTdFe/cUl/zcAjfWszTKqrXtum2abd7Nr+6 4va92ZzNOdGceVJ1yV8aBpGGIAweACvpPF5wi+b39m2es7z2Cp1s/0pYEvytjR5EbW/K G62Q== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=YE3hiGii; 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 x16-20020a056a00189000b0058db504f977si4141392pfh.294.2023.02.03.14.08.27; Fri, 03 Feb 2023 14:08:40 -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=YE3hiGii; 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 S233187AbjBCWGE (ORCPT + 99 others); Fri, 3 Feb 2023 17:06:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56490 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233935AbjBCWFy (ORCPT ); Fri, 3 Feb 2023 17:05:54 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 47833AB5DE; Fri, 3 Feb 2023 14:05:53 -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 ams.source.kernel.org (Postfix) with ESMTPS id EF6F5B82C32; Fri, 3 Feb 2023 22:05:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D9FD4C4339C; Fri, 3 Feb 2023 22:05:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1675461950; bh=bmnsttKFT2vt8nGO3aA3GL09+qkDKrC1WcjQyEBFYe0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YE3hiGiiwH26Qr/K5PJOS+hNPeo3XuuCzqosW8oIqc0E3EJH0XGyBuNtXvJJ+SDrq JWmWDQWlcs+rYmML0rmuGU0SgDAh8zsWcPGWR/IeV9EOploqiQQdVC6qQ3Mjd98Kkp qRir1VJnOqGiyahlKVWc3Q3eeabaKpe08lyVFr75tS/LESPPL1b4z/fZbqVUOKw35u FmxMJjAAFN4EIAdXWaTf/CNUOG+n3QxS4Ayq9xfsJ63ylTjRXx8FH6ZqSSf9B9zOjo Do4XcGJmVDfvZbC1YhgBETGpx9fbFkRBfVkORFUvu04PjtpY5bUIjcbGas4InxOYCL W7lQoYSaYIxBA== 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 05/22] csky/cpu: Make sure arch_cpu_idle_dead() doesn't return Date: Fri, 3 Feb 2023 14:05:14 -0800 Message-Id: X-Mailer: git-send-email 2.39.0 In-Reply-To: References: MIME-Version: 1.0 Content-type: text/plain X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, 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?1756849368788201136?= X-GMAIL-MSGID: =?utf-8?q?1756849368788201136?= arch_cpu_idle_dead() doesn't return. Make that more explicit with a BUG(). BUG() is preferable to unreachable() because BUG() is a more explicit failure mode and avoids undefined behavior like falling off the edge of the function into whatever code happens to be next. Signed-off-by: Josh Poimboeuf Acked-by: Guo Ren --- arch/csky/kernel/smp.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/csky/kernel/smp.c b/arch/csky/kernel/smp.c index b45d1073307f..0ec20efaf5fd 100644 --- a/arch/csky/kernel/smp.c +++ b/arch/csky/kernel/smp.c @@ -317,5 +317,7 @@ void arch_cpu_idle_dead(void) "jmpi csky_start_secondary" : : "r" (secondary_stack)); + + BUG(); } #endif