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=-12.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=unavailable 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 53FE2C433E0 for ; Wed, 5 Aug 2020 23:51:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2E9F221D95 for ; Wed, 5 Aug 2020 23:51:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="gVcEk7Me" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726545AbgHEXvm (ORCPT ); Wed, 5 Aug 2020 19:51:42 -0400 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:59777 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725969AbgHEXvl (ORCPT ); Wed, 5 Aug 2020 19:51:41 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1596671499; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=ymAmVIHHL+Dhhj1h1m9JWFZK2nhEhBDWELf2pfbLxZ0=; b=gVcEk7MehsVmMU7RE4kh93agO0J2ylBzUtbiufEcoQC3zEG5VkHE6qaIX7ZbXg3FOYt1YB 5NNIfhytpA0W5DsWfhg3F27Oh7YhOcarDUcbaeDzOGp/RrWt92xnJbT1M3HF9Ol2sqeNFd XdQaWjY6GhjFLuhYYPNAXcUSsDVm7Os= Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-184-D-Fj4btsNxCRB5TlqNKSRg-1; Wed, 05 Aug 2020 19:51:25 -0400 X-MC-Unique: D-Fj4btsNxCRB5TlqNKSRg-1 Received: by mail-wm1-f69.google.com with SMTP id v8so3021961wma.6 for ; Wed, 05 Aug 2020 16:51:25 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=ymAmVIHHL+Dhhj1h1m9JWFZK2nhEhBDWELf2pfbLxZ0=; b=WeYqqIUynOyMhzl0gId/o+WuX1GHQf4IpZ/ruUi4MKMgu/tO+s6/GZV8l9CpM8zxJh Z9wq8xAUgySqLX/X6Tqg7ToyKFjBIV1U/N2SlJ8KlEwXCvH1DWS2Cob0t+W8NgZN6sqk aiQoEp5XnUlxXFj5udyuuO7aSKuQWom7ZSDHnwt8eklRsPoXzuVdy5pmeqdzTzb+TxqI KCTzDj++q/DjPLkTQahX95QqziTe/X2jjDX4mkKHpTbAwGgLvRjqDDKfHpGSRU/e3JqJ vZIZW31nlrAWY640ua7+SvDL5P9radK0+zhLmKYstGJotzNmuXXyfA0O60xzb5y6wrFq AJVA== X-Gm-Message-State: AOAM533iJquJjMG1UBDAvRWsUGhD63lL7zOfYXwd5Vbl6f3a0/a0mcP7 4SLdVNrViqtdZb/FGHk8QTbCRauYROMWKaiK+BtCP+8tpCKN0cKWqZVStO1sQ+11EmnBt/2vhXo o35cmjk9+JQ22EhIh X-Received: by 2002:a1c:7e44:: with SMTP id z65mr5641568wmc.13.1596671483705; Wed, 05 Aug 2020 16:51:23 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyhju1ve0kkpCATUrgTYIgXrE3GBjo7F/ffCZhO4W/DdC3nDfToWjShQ/n9PBezQv2u+xI/jA== X-Received: by 2002:a1c:7e44:: with SMTP id z65mr5641553wmc.13.1596671483427; Wed, 05 Aug 2020 16:51:23 -0700 (PDT) Received: from redhat.com (bzq-79-177-102-128.red.bezeqint.net. [79.177.102.128]) by smtp.gmail.com with ESMTPSA id v15sm4525545wrm.23.2020.08.05.16.51.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Aug 2020 16:51:22 -0700 (PDT) Date: Wed, 5 Aug 2020 19:51:19 -0400 From: "Michael S. Tsirkin" To: kernel test robot Cc: kbuild-all@lists.01.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Subject: Re: [vhost:vhost 32/52] include/linux/typecheck.h:12:18: warning: comparison of distinct pointer types lacks a cast Message-ID: <20200805190937-mutt-send-email-mst@kernel.org> References: <202008060456.M9GRXltb%lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <202008060456.M9GRXltb%lkp@intel.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Thu, Aug 06, 2020 at 04:17:13AM +0800, kernel test robot wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git vhost > head: 4c05433bc6fb4ae172270f0279be8ba89a3da64f > commit: b025584098e621d88894d28e80af686958e273af [32/52] virtio_input: convert to LE accessors > config: parisc-randconfig-r003-20200805 (attached as .config) > compiler: hppa-linux-gcc (GCC) 9.3.0 > reproduce (this is a W=1 build): > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > git checkout b025584098e621d88894d28e80af686958e273af > # save the attached .config to linux build tree > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc Weird. So the following fixes it: diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index ecb166c824bb..8fe857e27ef3 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -357,10 +357,10 @@ static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val) */ #define virtio_le_to_cpu(x) \ _Generic((x), \ - __u8: (x), \ - __le16: le16_to_cpu(x), \ - __le32: le32_to_cpu(x), \ - __le64: le64_to_cpu(x) \ + __u8: (u8)(x), \ + __le16: (u16)le16_to_cpu(x), \ + __le32: (u32)le32_to_cpu(x), \ + __le64: (u64)le64_to_cpu(x) \ ) #define virtio_cpu_to_le(x, m) \ @@ -400,7 +400,6 @@ static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val) *(ptr) = virtio_le_to_cpu(virtio_cread_v); \ } while(0) -/* Config space accessors. */ #define virtio_cwrite_le(vdev, structname, member, ptr) \ do { \ typeof(((structname*)0)->member) virtio_cwrite_v = \ How could this be? le16_to_cpu doesn't return a u16? I suspect this compiler gets confused by _Generic. Let's hope it does not also miscompile the code :) > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot > > All warnings (new ones prefixed by >>): > > In file included from include/linux/irqflags.h:15, > from include/asm-generic/cmpxchg-local.h:6, > from arch/parisc/include/asm/cmpxchg.h:89, > from arch/parisc/include/asm/atomic.h:10, > from include/linux/atomic.h:7, > from arch/parisc/include/asm/bitops.h:13, > from include/linux/bitops.h:29, > from include/linux/kernel.h:12, > from include/linux/list.h:9, > from include/linux/module.h:12, > from drivers/virtio/virtio_input.c:2: > drivers/virtio/virtio_input.c: In function 'virtinput_probe': > >> include/linux/typecheck.h:12:18: warning: comparison of distinct pointer types lacks a cast > 12 | (void)(&__dummy == &__dummy2); \ > | ^~ > include/linux/virtio_config.h:405:3: note: in expansion of macro 'typecheck' > 405 | typecheck(typeof(virtio_le_to_cpu(virtio_cread_v)), *(ptr)); \ > | ^~~~~~~~~ > drivers/virtio/virtio_input.c:247:3: note: in expansion of macro 'virtio_cread_le' > 247 | virtio_cread_le(vi->vdev, struct virtio_input_config, > | ^~~~~~~~~~~~~~~ > >> include/linux/typecheck.h:12:18: warning: comparison of distinct pointer types lacks a cast > 12 | (void)(&__dummy == &__dummy2); \ > | ^~ > include/linux/virtio_config.h:405:3: note: in expansion of macro 'typecheck' > 405 | typecheck(typeof(virtio_le_to_cpu(virtio_cread_v)), *(ptr)); \ > | ^~~~~~~~~ > drivers/virtio/virtio_input.c:249:3: note: in expansion of macro 'virtio_cread_le' > 249 | virtio_cread_le(vi->vdev, struct virtio_input_config, > | ^~~~~~~~~~~~~~~ > >> include/linux/typecheck.h:12:18: warning: comparison of distinct pointer types lacks a cast > 12 | (void)(&__dummy == &__dummy2); \ > | ^~ > include/linux/virtio_config.h:405:3: note: in expansion of macro 'typecheck' > 405 | typecheck(typeof(virtio_le_to_cpu(virtio_cread_v)), *(ptr)); \ > | ^~~~~~~~~ > drivers/virtio/virtio_input.c:251:3: note: in expansion of macro 'virtio_cread_le' > 251 | virtio_cread_le(vi->vdev, struct virtio_input_config, > | ^~~~~~~~~~~~~~~ > >> include/linux/typecheck.h:12:18: warning: comparison of distinct pointer types lacks a cast > 12 | (void)(&__dummy == &__dummy2); \ > | ^~ > include/linux/virtio_config.h:405:3: note: in expansion of macro 'typecheck' > 405 | typecheck(typeof(virtio_le_to_cpu(virtio_cread_v)), *(ptr)); \ > | ^~~~~~~~~ > drivers/virtio/virtio_input.c:253:3: note: in expansion of macro 'virtio_cread_le' > 253 | virtio_cread_le(vi->vdev, struct virtio_input_config, > | ^~~~~~~~~~~~~~~ > > vim +12 include/linux/typecheck.h > > e0deaff470900a4 Andrew Morton 2008-07-25 4 > e0deaff470900a4 Andrew Morton 2008-07-25 5 /* > e0deaff470900a4 Andrew Morton 2008-07-25 6 * Check at compile time that something is of a particular type. > e0deaff470900a4 Andrew Morton 2008-07-25 7 * Always evaluates to 1 so you may use it easily in comparisons. > e0deaff470900a4 Andrew Morton 2008-07-25 8 */ > e0deaff470900a4 Andrew Morton 2008-07-25 9 #define typecheck(type,x) \ > e0deaff470900a4 Andrew Morton 2008-07-25 10 ({ type __dummy; \ > e0deaff470900a4 Andrew Morton 2008-07-25 11 typeof(x) __dummy2; \ > e0deaff470900a4 Andrew Morton 2008-07-25 @12 (void)(&__dummy == &__dummy2); \ > e0deaff470900a4 Andrew Morton 2008-07-25 13 1; \ > e0deaff470900a4 Andrew Morton 2008-07-25 14 }) > e0deaff470900a4 Andrew Morton 2008-07-25 15 > > :::::: The code at line 12 was first introduced by commit > :::::: e0deaff470900a4c3222ca7139f6c9639e26a2f5 split the typecheck macros out of include/linux/kernel.h > > :::::: TO: Andrew Morton > :::::: CC: Linus Torvalds > > --- > 0-DAY CI Kernel Test Service, Intel Corporation > https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org