From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 78F31C43381 for ; Fri, 8 Mar 2019 23:17:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4CAC22064A for ; Fri, 8 Mar 2019 23:17:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726756AbfCHXR2 (ORCPT ); Fri, 8 Mar 2019 18:17:28 -0500 Received: from shards.monkeyblade.net ([23.128.96.9]:41388 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726423AbfCHXR1 (ORCPT ); Fri, 8 Mar 2019 18:17:27 -0500 Received: from localhost (unknown [IPv6:2601:601:9f80:35cd::d71]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) (Authenticated sender: davem-davemloft) by shards.monkeyblade.net (Postfix) with ESMTPSA id 2BA081479DBE8; Fri, 8 Mar 2019 15:17:27 -0800 (PST) Date: Fri, 08 Mar 2019 15:17:26 -0800 (PST) Message-Id: <20190308.151726.1373226353046701716.davem@davemloft.net> To: arnd@arndb.de Cc: mst@redhat.com, jasowang@redhat.com, stefanha@redhat.com, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] vhost: silence an unused-variable warning From: David Miller In-Reply-To: <20190306110602.2529137-1-arnd@arndb.de> References: <20190306110602.2529137-1-arnd@arndb.de> X-Mailer: Mew version 6.8 on Emacs 26.1 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Fri, 08 Mar 2019 15:17:27 -0800 (PST) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Arnd Bergmann Date: Wed, 6 Mar 2019 12:05:49 +0100 > On some architectures, the MMU can be disabled, leading to access_ok() > becoming an empty macro that does not evaluate its size argument, > which in turn produces an unused-variable warning: > > drivers/vhost/vhost.c:1191:9: error: unused variable 's' [-Werror,-Wunused-variable] > size_t s = vhost_has_feature(vq, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0; > > Mark the variable as __maybe_unused to shut up that warning. > > Signed-off-by: Arnd Bergmann I'll apply this, thanks Arnd.