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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EE373C433EF for ; Mon, 28 Mar 2022 17:17:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244528AbiC1RTA (ORCPT ); Mon, 28 Mar 2022 13:19:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51286 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236199AbiC1RS5 (ORCPT ); Mon, 28 Mar 2022 13:18:57 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0187164BE0 for ; Mon, 28 Mar 2022 10:17:15 -0700 (PDT) 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 ams.source.kernel.org (Postfix) with ESMTPS id 891FCB8117D for ; Mon, 28 Mar 2022 17:17:14 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E3505C340F0; Mon, 28 Mar 2022 17:17:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1648487833; bh=tsHOIB8dmpEnEigOmeEzDX7+3UaF+f5tQDsXH8gievU=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=R+dhNRJ3fJh94YsiEAPa1fz1v7bIvyALQBN7pfBRthhbjgJBB/MVXl5gZBOQsiMlV VwO+I5g9NbgOzKZh0i+HOw+qKjeDKND6BAodGwsbLoQEqH98Syj8UynG/+rr6US8Uu j4FSxhaE/h0BO8fghQhNfSv+5SKpiq9r3JuHUTvcu+oF+f1kztqR4CznJQWopZFJ7L O3auhUsc+FUZoUaKW+2xQSjLd4e1yRCzmxz5S+odM3LswUuClzU2xXNxcTmUTuNKh/ C4v+QgKdbNiA73tkI5Sqk9Z6vuknKXg36V2QT79anPX7LTPEgSBeB780JEjCX6kCDg dRqiMKebjRkcQ== Date: Mon, 28 Mar 2022 10:17:11 -0700 From: Jakub Kicinski To: kernel test robot Cc: Eric Dumazet , kbuild-all@lists.01.org, linux-kernel@vger.kernel.org, Brian Vazquez , linux-riscv@lists.infradead.org Subject: Re: net/core/dev.c:10290:18: sparse: sparse: cast removes address space '__percpu' of expression Message-ID: <20220328101711.111e1dd5@kernel.org> In-Reply-To: <202203281436.hsNgYWWu-lkp@intel.com> References: <202203281436.hsNgYWWu-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org CC: riscv, is there something special about cmpxchg() on that arch? We don't see it on x86, and I don't see anything special in the code for riscv, at least on 5.17. On Mon, 28 Mar 2022 14:28:34 +0800 kernel test robot wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > head: ae085d7f9365de7da27ab5c0d16b12d51ea7fca9 > commit: 625788b5844511cf4c30cffa7fa0bc3a69cebc82 net: add per-cpu storage and net->core_stats > date: 2 weeks ago > config: riscv-randconfig-s032-20220328 (https://download.01.org/0day-ci/archive/20220328/202203281436.hsNgYWWu-lkp@intel.com/config) > compiler: riscv64-linux-gcc (GCC) 11.2.0 > reproduce: > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > # apt-get install sparse > # sparse version: v0.6.4-dirty > # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=625788b5844511cf4c30cffa7fa0bc3a69cebc82 > git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > git fetch --no-tags linus master > git checkout 625788b5844511cf4c30cffa7fa0bc3a69cebc82 > # save the config file to linux build tree > mkdir build_dir > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=riscv SHELL=/bin/bash net/core/ > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot > > > sparse warnings: (new ones prefixed by >>) > net/core/dev.c:3254:23: sparse: sparse: incorrect type in argument 4 (different base types) @@ expected restricted __wsum [usertype] csum @@ got unsigned int @@ > net/core/dev.c:3254:23: sparse: expected restricted __wsum [usertype] csum > net/core/dev.c:3254:23: sparse: got unsigned int > net/core/dev.c:3254:23: sparse: sparse: cast from restricted __wsum > >> net/core/dev.c:10290:18: sparse: sparse: cast removes address space '__percpu' of expression > net/core/dev.c:3759:17: sparse: sparse: context imbalance in '__dev_queue_xmit' - different lock contexts for basic block > net/core/dev.c:4961:17: sparse: sparse: context imbalance in 'net_tx_action' - different lock contexts for basic block > > vim +/__percpu +10290 net/core/dev.c > > 10282 > 10283 struct net_device_core_stats *netdev_core_stats_alloc(struct net_device *dev) > 10284 { > 10285 struct net_device_core_stats __percpu *p; > 10286 > 10287 p = alloc_percpu_gfp(struct net_device_core_stats, > 10288 GFP_ATOMIC | __GFP_NOWARN); > 10289 > 10290 if (p && cmpxchg(&dev->core_stats, NULL, p)) > 10291 free_percpu(p); > 10292 > 10293 /* This READ_ONCE() pairs with the cmpxchg() above */ > 10294 p = READ_ONCE(dev->core_stats); > 10295 if (!p) > 10296 return NULL; > 10297 > 10298 return this_cpu_ptr(p); > 10299 } > 10300 EXPORT_SYMBOL(netdev_core_stats_alloc); > 10301 >