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 5ED82C4167D for ; Tue, 31 Oct 2023 22:21:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346579AbjJaWVD (ORCPT ); Tue, 31 Oct 2023 18:21:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49646 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346453AbjJaWVB (ORCPT ); Tue, 31 Oct 2023 18:21:01 -0400 Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.100]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 31E6C103 for ; Tue, 31 Oct 2023 15:20:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1698790858; x=1730326858; h=date:from:to:cc:subject:message-id:mime-version; bh=osGCNnHSWoccgR6iWXJsiQk+I62shHuLwIhpqQAxvqQ=; b=D+kXruUmlsjUoWvyvOmVbepXB5vXJP0lUEWPRUbW7WmBlvePbxhLouZU t2b12/yupoeudK4hWJgOAO/mtLXZGwDfIGdZympg1AHHraW2oUu3g5/6l sAw8x3APpxYq6LzhjAl+J1mi/rxZ2K3elojH4F78kFvcWk9D60XhqkmHn cX0XjoQvPR6DkFHvPYWkzPP7aO1k4lIZlbxLKxy0Ey502SKPjtlQ4e8+E +R7fk8MffEQuncFCMdUErVYF8+FXUpuTdrtSRp4UIafGu6D5rhF/DK53+ P53W8u+neK02/MCv5it8TFPUecNsFXPIGAGBS7evQOlTEcKZBSjwx2DBC w==; X-IronPort-AV: E=McAfee;i="6600,9927,10880"; a="454854290" X-IronPort-AV: E=Sophos;i="6.03,266,1694761200"; d="scan'208";a="454854290" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Oct 2023 15:20:57 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10880"; a="831191463" X-IronPort-AV: E=Sophos;i="6.03,266,1694761200"; d="scan'208";a="831191463" Received: from lkp-server01.sh.intel.com (HELO 17d9e85e5079) ([10.239.97.150]) by fmsmga004.fm.intel.com with ESMTP; 31 Oct 2023 15:20:56 -0700 Received: from kbuild by 17d9e85e5079 with local (Exim 4.96) (envelope-from ) id 1qxx6U-0000Q7-04; Tue, 31 Oct 2023 22:20:54 +0000 Date: Wed, 1 Nov 2023 06:20:07 +0800 From: kernel test robot To: Jens Axboe Cc: oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org Subject: fs/eventpoll.c:526:9: sparse: sparse: restricted __poll_t degrades to integer Message-ID: <202311010654.LEo7oBW4-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 5a6a09e97199d6600d31383055f9d43fbbcbe86f commit: caf1aeaffc3b09649a56769e559333ae2c4f1802 eventpoll: add EPOLL_URING_WAKE poll wakeup flag date: 11 months ago config: x86_64-randconfig-r031-20230909 (https://download.01.org/0day-ci/archive/20231101/202311010654.LEo7oBW4-lkp@intel.com/config) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231101/202311010654.LEo7oBW4-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202311010654.LEo7oBW4-lkp@intel.com/ sparse warnings: (new ones prefixed by >>) >> fs/eventpoll.c:526:9: sparse: sparse: restricted __poll_t degrades to integer >> fs/eventpoll.c:526:9: sparse: sparse: cast to restricted __poll_t >> fs/eventpoll.c:1213:53: sparse: sparse: incorrect type in argument 3 (different base types) @@ expected unsigned int pollflags @@ got restricted __poll_t @@ fs/eventpoll.c:1213:53: sparse: expected unsigned int pollflags fs/eventpoll.c:1213:53: sparse: got restricted __poll_t vim +526 fs/eventpoll.c 493 494 static void ep_poll_safewake(struct eventpoll *ep, struct epitem *epi, 495 unsigned pollflags) 496 { 497 struct eventpoll *ep_src; 498 unsigned long flags; 499 u8 nests = 0; 500 501 /* 502 * To set the subclass or nesting level for spin_lock_irqsave_nested() 503 * it might be natural to create a per-cpu nest count. However, since 504 * we can recurse on ep->poll_wait.lock, and a non-raw spinlock can 505 * schedule() in the -rt kernel, the per-cpu variable are no longer 506 * protected. Thus, we are introducing a per eventpoll nest field. 507 * If we are not being call from ep_poll_callback(), epi is NULL and 508 * we are at the first level of nesting, 0. Otherwise, we are being 509 * called from ep_poll_callback() and if a previous wakeup source is 510 * not an epoll file itself, we are at depth 1 since the wakeup source 511 * is depth 0. If the wakeup source is a previous epoll file in the 512 * wakeup chain then we use its nests value and record ours as 513 * nests + 1. The previous epoll file nests value is stable since its 514 * already holding its own poll_wait.lock. 515 */ 516 if (epi) { 517 if ((is_file_epoll(epi->ffd.file))) { 518 ep_src = epi->ffd.file->private_data; 519 nests = ep_src->nests; 520 } else { 521 nests = 1; 522 } 523 } 524 spin_lock_irqsave_nested(&ep->poll_wait.lock, flags, nests); 525 ep->nests = nests + 1; > 526 wake_up_locked_poll(&ep->poll_wait, EPOLLIN | pollflags); 527 ep->nests = 0; 528 spin_unlock_irqrestore(&ep->poll_wait.lock, flags); 529 } 530 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki