From patchwork Tue Feb 14 07:05:53 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Josh Poimboeuf X-Patchwork-Id: 13139538 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E8450C61DA4 for ; Tue, 14 Feb 2023 07:16:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=pSvNrcgDXi6yyM1oqS1mTHrczHLwoWPh9wJafvuyTJY=; b=1rYK3cVeAFEAmQ WAI7lj5AvW47NwihnBF9sCkqvgEavkz4P4c39JHzZfh2+AojlE8VTgGD9wGleLzC/0VapmiQ28qZU 0PEaoEknfnNVyvPPKbW0KF2aJ22xlA3IierXBgDCzeXY450ww9vOnMH7miomxB3RRdUWP03+UySez 1fEKB2O5ky/q3UhPJN5OLl0+DLh/kfp4GQZ4r7EBGAJm0j4vZtJy1qnKgAonXJiX2KMQukRXtEVHV qy4+j2FkpoVlQgAmCTxEKoBYvudOK25jdGcSkMJWjk+/qCjb9++5E2mmedr6wYzN1naTahZ7sa8KP F1OntPPvdslyKt8E4T4Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pRpXD-000CKA-IA; Tue, 14 Feb 2023 07:15:29 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pRpPQ-00085T-Ti for linux-arm-kernel@lists.infradead.org; Tue, 14 Feb 2023 07:07:27 +0000 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 6E95F61480; Tue, 14 Feb 2023 07:07:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2BC09C4339C; Tue, 14 Feb 2023 07:07:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1676358443; bh=Vz9pacmD2uWnKtGE9AgzwIGUED4qhPPVsYwwh31r10c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ihibyp4ipYh7lQbANFcsUTiHup0xNx5JMQ/c4E3q5yGId+1gTQii/DTVSUWTsOltw IqvTEQrOFzi2eFo294/k7bZhA6LANgcvqyIA6iJgUKc3l8XDMyd8GBQE+AIh601ofR Qc3xpRS1OEc1oUgLhUfbdhFWnImGAZlRDONcTJ/AUMAJRMW7eT2YlrHDa/yyWvyexc X6uQrIyw5EWPq7+6xku9zrDlYBy8ZUaQ+gxoKXgdd3pvsLjc6WJXXE5XCSZlHYHxoY 0KvkA5welRNTeqfi984yl9rKlVPjqPnNJdmII0J45bsDxbkD1Y+8mlhaPORYaSNPw7 yJswjRO+Y9qRw== 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 19/24] xtensa/cpu: Make sure cpu_die() doesn't return Date: Mon, 13 Feb 2023 23:05:53 -0800 Message-Id: X-Mailer: git-send-email 2.39.1 In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230213_230725_076427_DD46A3BF X-CRM114-Status: GOOD ( 10.72 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org cpu_die() 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 --- arch/xtensa/kernel/smp.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/xtensa/kernel/smp.c b/arch/xtensa/kernel/smp.c index 4dc109dd6214..7bad78495536 100644 --- a/arch/xtensa/kernel/smp.c +++ b/arch/xtensa/kernel/smp.c @@ -341,6 +341,8 @@ void __ref cpu_die(void) __asm__ __volatile__( " movi a2, cpu_restart\n" " jx a2\n"); + + BUG(); } #endif /* CONFIG_HOTPLUG_CPU */