152 lines
7.0 KiB
Diff
152 lines
7.0 KiB
Diff
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Mon, 12 Apr 2021 23:56:46 -0700 (PDT)
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Date: Tue, 13 Apr 2021 00:56:21 -0600
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In-Reply-To: <20210413065633.2782273-1-yuzhao@google.com>
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Message-Id: <20210413065633.2782273-5-yuzhao@google.com>
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Subject: [PATCH v2 04/16] include/linux/cgroup.h: export cgroup_mutex
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From: Yu Zhao <yuzhao@google.com>
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To: linux-mm@kvack.org
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Cc: Alex Shi <alexs@kernel.org>, Andi Kleen <ak@linux.intel.com>,
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Andrew Morton <akpm@linux-foundation.org>,
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Benjamin Manes <ben.manes@gmail.com>,
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Dave Chinner <david@fromorbit.com>,
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Dave Hansen <dave.hansen@linux.intel.com>,
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Hillf Danton <hdanton@sina.com>, Jens Axboe <axboe@kernel.dk>,
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Johannes Weiner <hannes@cmpxchg.org>,
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Jonathan Corbet <corbet@lwn.net>,
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Joonsoo Kim <iamjoonsoo.kim@lge.com>,
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Matthew Wilcox <willy@infradead.org>,
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Mel Gorman <mgorman@suse.de>,
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Miaohe Lin <linmiaohe@huawei.com>,
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Michael Larabel <michael@michaellarabel.com>,
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Michal Hocko <mhocko@suse.com>,
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Michel Lespinasse <michel@lespinasse.org>,
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Rik van Riel <riel@surriel.com>,
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Roman Gushchin <guro@fb.com>,
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Rong Chen <rong.a.chen@intel.com>,
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SeongJae Park <sjpark@amazon.de>,
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Tim Chen <tim.c.chen@linux.intel.com>,
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Vlastimil Babka <vbabka@suse.cz>,
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Yang Shi <shy828301@gmail.com>,
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Ying Huang <ying.huang@intel.com>, Zi Yan <ziy@nvidia.com>,
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linux-kernel@vger.kernel.org, lkp@lists.01.org,
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page-reclaim@google.com, Yu Zhao <yuzhao@google.com>
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Content-Type: text/plain; charset="UTF-8"
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Precedence: bulk
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List-ID: <linux-kernel.vger.kernel.org>
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X-Mailing-List: linux-kernel@vger.kernel.org
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Archived-At: <https://lore.kernel.org/lkml/20210413065633.2782273-5-yuzhao@google.com/>
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List-Archive: <https://lore.kernel.org/lkml/>
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List-Post: <mailto:linux-kernel@vger.kernel.org>
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cgroup_mutex is needed to synchronize with memcg creations.
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Signed-off-by: Yu Zhao <yuzhao@google.com>
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---
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include/linux/cgroup.h | 15 ++++++++++++++-
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1 file changed, 14 insertions(+), 1 deletion(-)
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diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
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index 4f2f79de083e..bd5744360cfa 100644
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--- a/include/linux/cgroup.h
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+++ b/include/linux/cgroup.h
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@@ -432,6 +432,18 @@ static inline void cgroup_put(struct cgroup *cgrp)
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css_put(&cgrp->self);
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}
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+extern struct mutex cgroup_mutex;
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+
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+static inline void cgroup_lock(void)
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+{
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+ mutex_lock(&cgroup_mutex);
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+}
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+
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+static inline void cgroup_unlock(void)
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+{
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+ mutex_unlock(&cgroup_mutex);
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+}
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+
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/**
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* task_css_set_check - obtain a task's css_set with extra access conditions
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* @task: the task to obtain css_set for
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@@ -446,7 +458,6 @@ static inline void cgroup_put(struct cgroup *cgrp)
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* as locks used during the cgroup_subsys::attach() methods.
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*/
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#ifdef CONFIG_PROVE_RCU
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-extern struct mutex cgroup_mutex;
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extern spinlock_t css_set_lock;
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#define task_css_set_check(task, __c) \
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rcu_dereference_check((task)->cgroups, \
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@@ -704,6 +715,8 @@ struct cgroup;
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static inline u64 cgroup_id(const struct cgroup *cgrp) { return 1; }
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static inline void css_get(struct cgroup_subsys_state *css) {}
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static inline void css_put(struct cgroup_subsys_state *css) {}
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+static inline void cgroup_lock(void) {}
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+static inline void cgroup_unlock(void) {}
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static inline int cgroup_attach_task_all(struct task_struct *from,
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struct task_struct *t) { return 0; }
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static inline int cgroupstats_build(struct cgroupstats *stats,
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--
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2.31.1.295.g9ea45b61b8-goog
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