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=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable 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 A8DC7C43381 for ; Sat, 13 Mar 2021 07:59:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7FA3564F1D for ; Sat, 13 Mar 2021 07:59:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233409AbhCMH6i (ORCPT ); Sat, 13 Mar 2021 02:58:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58964 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232230AbhCMH6C (ORCPT ); Sat, 13 Mar 2021 02:58:02 -0500 Received: from mail-qk1-x74a.google.com (mail-qk1-x74a.google.com [IPv6:2607:f8b0:4864:20::74a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 562C3C061574 for ; Fri, 12 Mar 2021 23:58:02 -0800 (PST) Received: by mail-qk1-x74a.google.com with SMTP id d137so4579263qkb.18 for ; Fri, 12 Mar 2021 23:58:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=aLRTkKE+4395hmMwkgIvoFPbmsRrSNB3cb7TyZ2ydVo=; b=RbyWeK4rUqhSF6l4+WOn4bz/6l7Kc8FPXxW3gI+7y8uPJAZ1QX8cf/I1Awt1gV/SbI bjnyW7mGxY1NMOZzzbS/+Pu/wZOk8PcdLyHQjU8FYS7MY3rlxWHPLiUeDkvVnQXqR/vU VjFNQgX24G3KsIyOvy72WKVvMUMe73K7lMeGcaq5JwzYtlJpwJmAq7im1mo7v1rCTUgA 0mo4ifiQHDGxfCFwMiqlcmL9XCp3IrCMWE8XU4ROv4uXfZw0LtfhovB0FFVhgU4OaGPo 9xkxh+e9HnpJUWha5GVEemFT2phEp+qmiZ0b0RvdNPBXFoxHBjwLSKOp/alc26idQnA2 6ehw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=aLRTkKE+4395hmMwkgIvoFPbmsRrSNB3cb7TyZ2ydVo=; b=sPWOPGHoVohb7G6EOihIswCUjaDOMsg/DvRB2ugPnziQk8PcjMml4kYe8yFsYiBamJ ZBRsKYaIxBbegmcuF2aq6FE8IRzx6eYh8i5L6RQ83/jPcS1VVViz30AEgGo2OR0qlRtK 6e9I4lEcrR67MLWdkHooamn5SOvnTfgJcr7FGERX+0O/FzSxT56KcHTaEjHYnS68pxQM cryChrhdy5jpPx9+EiGLdZI95GTYYHE3/TXMlABP1Dv4YEWI93zhR/ePrlm0SjEioKWR PW1K3Blnn4t6EIlzyEcAxmVz7702MA3b1x1hM3iPT6B+pwdovapsNRL+JH3s67twnKUc qBWQ== X-Gm-Message-State: AOAM532W7wUq4pmKjtVvHSPslHZDT9pB3jR1xJmNsJD9ZqrBMl8E+xpH v9xzx/Rcs8diDMvgzLYOU4hfhWFObf4= X-Google-Smtp-Source: ABdhPJwU+Y5hioYI52CJyazw+FjQUFeKf1QbQJTSQIAKTuuIxfYVSs2ErBNlMhmNRx4/c6B7zv8sBwMBzxE= X-Received: from yuzhao.bld.corp.google.com ([2620:15c:183:200:f931:d3e4:faa0:4f74]) (user=yuzhao job=sendgmr) by 2002:ad4:5c87:: with SMTP id o7mr1743197qvh.31.1615622281483; Fri, 12 Mar 2021 23:58:01 -0800 (PST) Date: Sat, 13 Mar 2021 00:57:37 -0700 In-Reply-To: <20210313075747.3781593-1-yuzhao@google.com> Message-Id: <20210313075747.3781593-5-yuzhao@google.com> Mime-Version: 1.0 References: <20210313075747.3781593-1-yuzhao@google.com> X-Mailer: git-send-email 2.31.0.rc2.261.g7f71774620-goog Subject: [PATCH v1 04/14] include/linux/cgroup.h: export cgroup_mutex From: Yu Zhao To: linux-mm@kvack.org Cc: Alex Shi , Andrew Morton , Dave Hansen , Hillf Danton , Johannes Weiner , Joonsoo Kim , Matthew Wilcox , Mel Gorman , Michal Hocko , Roman Gushchin , Vlastimil Babka , Wei Yang , Yang Shi , Ying Huang , linux-kernel@vger.kernel.org, page-reclaim@google.com, Yu Zhao Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Archived-At: List-Archive: List-Post: Export cgroup_mutex so it can be used to synchronize with memcg allocations. Signed-off-by: Yu Zhao --- include/linux/cgroup.h | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 4f2f79de083e..bd5744360cfa 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -432,6 +432,18 @@ static inline void cgroup_put(struct cgroup *cgrp) css_put(&cgrp->self); } +extern struct mutex cgroup_mutex; + +static inline void cgroup_lock(void) +{ + mutex_lock(&cgroup_mutex); +} + +static inline void cgroup_unlock(void) +{ + mutex_unlock(&cgroup_mutex); +} + /** * task_css_set_check - obtain a task's css_set with extra access conditions * @task: the task to obtain css_set for @@ -446,7 +458,6 @@ static inline void cgroup_put(struct cgroup *cgrp) * as locks used during the cgroup_subsys::attach() methods. */ #ifdef CONFIG_PROVE_RCU -extern struct mutex cgroup_mutex; extern spinlock_t css_set_lock; #define task_css_set_check(task, __c) \ rcu_dereference_check((task)->cgroups, \ @@ -704,6 +715,8 @@ struct cgroup; static inline u64 cgroup_id(const struct cgroup *cgrp) { return 1; } static inline void css_get(struct cgroup_subsys_state *css) {} static inline void css_put(struct cgroup_subsys_state *css) {} +static inline void cgroup_lock(void) {} +static inline void cgroup_unlock(void) {} static inline int cgroup_attach_task_all(struct task_struct *from, struct task_struct *t) { return 0; } static inline int cgroupstats_build(struct cgroupstats *stats, -- 2.31.0.rc2.261.g7f71774620-goog