From patchwork Mon Nov 8 10:11:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Borislav Petkov X-Patchwork-Id: 12608183 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F12B9C433F5 for ; Mon, 8 Nov 2021 10:13:10 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id BAFDD611C4 for ; Mon, 8 Nov 2021 10:13:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org BAFDD611C4 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=alien8.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.223173.385744 (Exim 4.92) (envelope-from ) id 1mk1dY-0000dX-3C; Mon, 08 Nov 2021 10:12:24 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 223173.385744; Mon, 08 Nov 2021 10:12:24 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1mk1dY-0000dQ-0G; Mon, 08 Nov 2021 10:12:24 +0000 Received: by outflank-mailman (input) for mailman id 223173; Mon, 08 Nov 2021 10:12:23 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1mk1dN-0000dK-8d for xen-devel@lists.xenproject.org; Mon, 08 Nov 2021 10:12:23 +0000 Received: from mail.skyhub.de (mail.skyhub.de [5.9.137.197]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 55cb7bd2-407c-11ec-9787-a32c541c8605; Mon, 08 Nov 2021 11:12:10 +0100 (CET) Received: from zn.tnic (p200300ec2f33110088892b77bd117736.dip0.t-ipconnect.de [IPv6:2003:ec:2f33:1100:8889:2b77:bd11:7736]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id BABC81EC04E0; Mon, 8 Nov 2021 11:12:09 +0100 (CET) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 55cb7bd2-407c-11ec-9787-a32c541c8605 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1636366329; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=grdSLe+txR+qPcky5ijEGsjPCSkRE9m2uQKOXesimzE=; b=OveTWrDzAdrOoSEwa1Av97jBWR5pZb8d7IM/QcE2Bm0tLy+LKZctYgVNu/8HPp+khPKy8S fBJxFCpTfhDSa0lqOVDygpDhEY+AGd64/coDHahUOeAP4LgJ5PPdM1pvgt1eBYUTFfAiTM J8ofTFwzerbk/CRlwmeCnSLXSqeLzqY= From: Borislav Petkov To: LKML Cc: xen-devel@lists.xenproject.org Subject: [PATCH v0 02/42] xen/x86: Check notifier registration return value Date: Mon, 8 Nov 2021 11:11:17 +0100 Message-Id: <20211108101157.15189-3-bp@alien8.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20211108101157.15189-1-bp@alien8.de> References: <20211108101157.15189-1-bp@alien8.de> MIME-Version: 1.0 From: Borislav Petkov Avoid homegrown notifier registration checks. No functional changes. Signed-off-by: Borislav Petkov Cc: xen-devel@lists.xenproject.org --- arch/x86/xen/enlighten.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 95d970359e17..2264dd6e157f 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -354,7 +354,9 @@ static struct notifier_block xen_panic_block = { int xen_panic_handler_init(void) { - atomic_notifier_chain_register(&panic_notifier_list, &xen_panic_block); + if (atomic_notifier_chain_register(&panic_notifier_list, &xen_panic_block)) + pr_warn("Xen panic notifier already registered\n"); + return 0; }