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=-12.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 DA820C41604 for ; Sun, 4 Oct 2020 02:40:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AE81120657 for ; Sun, 4 Oct 2020 02:40:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726722AbgJDCkJ (ORCPT ); Sat, 3 Oct 2020 22:40:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48892 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726569AbgJDCji (ORCPT ); Sat, 3 Oct 2020 22:39:38 -0400 Received: from ZenIV.linux.org.uk (zeniv.linux.org.uk [IPv6:2002:c35c:fd02::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0C2D9C0613B0; Sat, 3 Oct 2020 19:39:35 -0700 (PDT) Received: from viro by ZenIV.linux.org.uk with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kOtvx-00BUs4-NS; Sun, 04 Oct 2020 02:39:33 +0000 From: Al Viro To: Linus Torvalds Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Marc Zyngier Subject: [RFC PATCH 25/27] lift rcu_read_lock() into reverse_path_check() Date: Sun, 4 Oct 2020 03:39:27 +0100 Message-Id: <20201004023929.2740074-25-viro@ZenIV.linux.org.uk> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20201004023929.2740074-1-viro@ZenIV.linux.org.uk> References: <20201004023608.GM3421308@ZenIV.linux.org.uk> <20201004023929.2740074-1-viro@ZenIV.linux.org.uk> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: Al Viro Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Al Viro Signed-off-by: Al Viro --- fs/eventpoll.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/eventpoll.c b/fs/eventpoll.c index 78b8769b72dc..8a7ad752befd 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -1257,7 +1257,6 @@ static int reverse_path_check_proc(struct file *file, int depth) return -1; /* CTL_DEL can remove links here, but that can't increase our count */ - rcu_read_lock(); hlist_for_each_entry_rcu(epi, &file->f_ep_links, fllink) { struct file *recepient = epi->ep->file; if (WARN_ON(!is_file_epoll(recepient))) @@ -1269,7 +1268,6 @@ static int reverse_path_check_proc(struct file *file, int depth) if (error != 0) break; } - rcu_read_unlock(); return error; } @@ -1291,7 +1289,9 @@ static int reverse_path_check(void) /* let's call this for all tfiles */ list_for_each_entry(current_file, &tfile_check_list, f_tfile_llink) { path_count_init(); + rcu_read_lock(); error = reverse_path_check_proc(current_file, 0); + rcu_read_unlock(); if (error) break; } -- 2.11.0