From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:46134 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933483AbcIVNmV (ORCPT ); Thu, 22 Sep 2016 09:42:21 -0400 Subject: Patch "cpuset: make sure new tasks conform to the current config of the cpuset" has been added to the 4.4-stable tree To: lizefan@huawei.com, gregkh@linuxfoundation.org, tj@kernel.org Cc: , From: Date: Thu, 22 Sep 2016 15:41:40 +0200 Message-ID: <1474551700197223@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled cpuset: make sure new tasks conform to the current config of the cpuset to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: cpuset-make-sure-new-tasks-conform-to-the-current-config-of-the-cpuset.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 06f4e94898918bcad00cdd4d349313a439d6911e Mon Sep 17 00:00:00 2001 From: Zefan Li Date: Tue, 9 Aug 2016 11:25:01 +0800 Subject: cpuset: make sure new tasks conform to the current config of the cpuset From: Zefan Li commit 06f4e94898918bcad00cdd4d349313a439d6911e upstream. A new task inherits cpus_allowed and mems_allowed masks from its parent, but if someone changes cpuset's config by writing to cpuset.cpus/cpuset.mems before this new task is inserted into the cgroup's task list, the new task won't be updated accordingly. Signed-off-by: Zefan Li Signed-off-by: Tejun Heo Signed-off-by: Greg Kroah-Hartman --- kernel/cpuset.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -2074,6 +2074,20 @@ static void cpuset_bind(struct cgroup_su mutex_unlock(&cpuset_mutex); } +/* + * Make sure the new task conform to the current state of its parent, + * which could have been changed by cpuset just after it inherits the + * state from the parent and before it sits on the cgroup's task list. + */ +void cpuset_fork(struct task_struct *task) +{ + if (task_css_is_root(task, cpuset_cgrp_id)) + return; + + set_cpus_allowed_ptr(task, ¤t->cpus_allowed); + task->mems_allowed = current->mems_allowed; +} + struct cgroup_subsys cpuset_cgrp_subsys = { .css_alloc = cpuset_css_alloc, .css_online = cpuset_css_online, @@ -2084,6 +2098,7 @@ struct cgroup_subsys cpuset_cgrp_subsys .attach = cpuset_attach, .post_attach = cpuset_post_attach, .bind = cpuset_bind, + .fork = cpuset_fork, .legacy_cftypes = files, .early_init = 1, }; Patches currently in stable-queue which might be from lizefan@huawei.com are queue-4.4/cpuset-make-sure-new-tasks-conform-to-the-current-config-of-the-cpuset.patch