From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758924Ab0BYKMg (ORCPT ); Thu, 25 Feb 2010 05:12:36 -0500 Received: from hera.kernel.org ([140.211.167.34]:40855 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758908Ab0BYKMd (ORCPT ); Thu, 25 Feb 2010 05:12:33 -0500 Date: Thu, 25 Feb 2010 10:11:56 GMT From: "tip-bot for Paul E. McKenney" Cc: linux-kernel@vger.kernel.org, paulmck@linux.vnet.ibm.com, hpa@zytor.com, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de, mingo@elte.hu Reply-To: mingo@redhat.com, hpa@zytor.com, paulmck@linux.vnet.ibm.com, linux-kernel@vger.kernel.org, peterz@infradead.org, tglx@linutronix.de, mingo@elte.hu In-Reply-To: <1266887105-1528-9-git-send-email-paulmck@linux.vnet.ibm.com> References: <1266887105-1528-9-git-send-email-paulmck@linux.vnet.ibm.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:core/rcu] vfs: Abstract rcu_dereference_check for files-fdtable use Message-ID: Git-Commit-ID: af61b96b4f68f7ab25ebf34fed275fabf64f2edc X-Mailer: tip-git-log-daemon MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.3 (hera.kernel.org [127.0.0.1]); Thu, 25 Feb 2010 10:11:56 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: af61b96b4f68f7ab25ebf34fed275fabf64f2edc Gitweb: http://git.kernel.org/tip/af61b96b4f68f7ab25ebf34fed275fabf64f2edc Author: Paul E. McKenney AuthorDate: Mon, 22 Feb 2010 17:04:53 -0800 Committer: Ingo Molnar CommitDate: Thu, 25 Feb 2010 10:34:49 +0100 vfs: Abstract rcu_dereference_check for files-fdtable use Create an rcu_dereference_check_fdtable() that encapsulates the rcu_dereference_check() condition for fcheck_files() use. This has the beneficial side-effect of getting rid of a very long line. Suggested-by: Peter Zijlstra Signed-off-by: Paul E. McKenney Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu Cc: dhowells@redhat.com LKML-Reference: <1266887105-1528-9-git-send-email-paulmck@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar --- include/linux/fdtable.h | 11 +++++++---- 1 files changed, 7 insertions(+), 4 deletions(-) diff --git a/include/linux/fdtable.h b/include/linux/fdtable.h index 144412f..013dc52 100644 --- a/include/linux/fdtable.h +++ b/include/linux/fdtable.h @@ -57,11 +57,14 @@ struct files_struct { struct file * fd_array[NR_OPEN_DEFAULT]; }; -#define files_fdtable(files) \ - (rcu_dereference_check((files)->fdt, \ +#define rcu_dereference_check_fdtable(files, fdtfd) \ + (rcu_dereference_check((fdtfd), \ rcu_read_lock_held() || \ lockdep_is_held(&(files)->file_lock) || \ - atomic_read(&files->count) == 1)) + atomic_read(&(files)->count) == 1)) + +#define files_fdtable(files) \ + (rcu_dereference_check_fdtable((files), (files)->fdt)) struct file_operations; struct vfsmount; @@ -82,7 +85,7 @@ static inline struct file * fcheck_files(struct files_struct *files, unsigned in struct fdtable *fdt = files_fdtable(files); if (fd < fdt->max_fds) - file = rcu_dereference_check(fdt->fd[fd], rcu_read_lock_held() || lockdep_is_held(&files->file_lock) || atomic_read(&files->count) == 1); + file = rcu_dereference_check_fdtable(files, fdt->fd[fd]); return file; }