From patchwork Thu Jun 20 13:51:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Federico Serafini X-Patchwork-Id: 13705544 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 5D2CFC2D0D0 for ; Thu, 20 Jun 2024 13:52:16 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.744511.1151594 (Exim 4.92) (envelope-from ) id 1sKICn-0000mM-3t; Thu, 20 Jun 2024 13:52:01 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 744511.1151594; Thu, 20 Jun 2024 13:52:01 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1sKICm-0000ko-Sw; Thu, 20 Jun 2024 13:52:00 +0000 Received: by outflank-mailman (input) for mailman id 744511; Thu, 20 Jun 2024 13:51:59 +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 1sKICl-0008AF-G5 for xen-devel@lists.xenproject.org; Thu, 20 Jun 2024 13:51:59 +0000 Received: from support.bugseng.com (mail.bugseng.com [162.55.131.47]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 436bee80-2f0c-11ef-90a3-e314d9c70b13; Thu, 20 Jun 2024 15:51:59 +0200 (CEST) Received: from truciolo.bugseng.com (unknown [78.208.165.219]) by support.bugseng.com (Postfix) with ESMTPSA id 6075A4EE0754; Thu, 20 Jun 2024 15:51:58 +0200 (CEST) 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: 436bee80-2f0c-11ef-90a3-e314d9c70b13 From: Federico Serafini To: xen-devel@lists.xenproject.org Cc: consulting@bugseng.com, Federico Serafini Subject: [XEN PATCH 09/13] x86/mm: add defensive return Date: Thu, 20 Jun 2024 15:51:43 +0200 Message-Id: <282da9981826370ca839503477fb515af14ff4b5.1718890095.git.federico.serafini@bugseng.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <10af9145252a2f5c31ea0f13cbb67cbe76a8ba3a.1718890095.git.federico.serafini@bugseng.com> References: <10af9145252a2f5c31ea0f13cbb67cbe76a8ba3a.1718890095.git.federico.serafini@bugseng.com> MIME-Version: 1.0 Add defensive return statement at the end of an unreachable default case. Other than improve safety, this meets the requirements to deviate a violation of MISRA C Rule 16.3. Signed-off-by: Federico Serafini --- xen/arch/x86/mm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c index 648d6dd475..2e19ced15e 100644 --- a/xen/arch/x86/mm.c +++ b/xen/arch/x86/mm.c @@ -916,6 +916,7 @@ get_page_from_l1e( return 0; default: ASSERT_UNREACHABLE(); + return 0; } } else if ( l1f & _PAGE_RW )