From patchwork Fri Feb 3 22:05:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Josh Poimboeuf X-Patchwork-Id: 13128503 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 C08CEC05027 for ; Fri, 3 Feb 2023 22:31:56 +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=uGPcRPjwwHgjUTnoWKYJpypdXr7LROgoxK/7mE15BlE=; b=fR+MwLH6zqHhkG WDXWSJizYl6NJFAWn9ICaNwr/KdOJ24HNi17ACMBnfdk5VNgCpF2oIpO/TwPyyN3kUvzaTYDulgrW JeYqMkz4+W1BSvDgqHF5NzToVxVntlQVeD41wq2KEIhaFWQxjI9sF4j23AHiVNpWKjftP0QFcazud TgdpFMZdLA1hMA80KeHSJ1/8BaRsUi6+ejigOBf4DulVJ41XfGD0UXvmQoZ6D7fA7g7j4NbLmILr7 EpPegrJnjSYJqVdfIBZJr0gnsRVnPkbZRqoHtIHHukNIIRj3eLLNhrv6UQrvzIEP02E75RZXH/TFR n2SpXqjigam6r0VN/h8A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pO4a5-003sR9-PK; Fri, 03 Feb 2023 22:30:54 +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 1pO4CH-003k2m-HR for linux-arm-kernel@lists.infradead.org; Fri, 03 Feb 2023 22:06:19 +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 045EF62021; Fri, 3 Feb 2023 22:06:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 265AEC433D2; Fri, 3 Feb 2023 22:06:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1675461976; bh=qzio4RRFUV3T4RxMjX88Z4lXma5TBrgxzmQ4rFvXUQ4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=k65vkzVP6z141oLnhjfrwBtKaSVH4NDImaR6KsAo5tm4t33CTjXSkk1Kc002UVteN xjJFsLbbmrzV/oEDThT0uVKwXiyt81xJhbaZw5d1W0aCS8iJi8ZN1n47ZmOxdaXlne brWwWunBne264Md4i+0bg1dx7gUqkbA9IFbPGDydUxEo11sw9DVpvqZHgK2MDBJDej trULeFzTKyDLcTkcAA8D9XSzTnv4n/e1IfgE/o/RMoSp7z0wipVfyAtH77G7/nVsy4 343nx2w/X70+IGMD3m7acnwGo130O5HOl5lHXueR8i/o1BQV7Ek1JE0i3Q3oOf9k9F DgZNg3mMxOn+w== 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 19/22] xtensa/cpu: Make sure cpu_die() doesn't return Date: Fri, 3 Feb 2023 14:05:28 -0800 Message-Id: <13cfde410b50047d778f535d12d928813e92c745.1675461757.git.jpoimboe@kernel.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230203_140617_642250_ACA2CB39 X-CRM114-Status: GOOD ( 10.63 ) 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 */