From nobody Sun Feb 8 13:10:44 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8D05DC77B73 for ; Sat, 27 May 2023 02:40:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230527AbjE0CkP (ORCPT ); Fri, 26 May 2023 22:40:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50588 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229715AbjE0CkN (ORCPT ); Fri, 26 May 2023 22:40:13 -0400 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B9FDFC9; Fri, 26 May 2023 19:40:11 -0700 (PDT) Received: from canpemm500002.china.huawei.com (unknown [172.30.72.57]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4QSm9f52TQzqSHN; Sat, 27 May 2023 10:35:34 +0800 (CST) Received: from huawei.com (10.175.104.170) by canpemm500002.china.huawei.com (7.192.104.244) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.23; Sat, 27 May 2023 10:40:07 +0800 From: Miaohe Lin To: , , , , CC: , , , , Subject: [PATCH] memcg: remove unused mem_cgroup_from_obj() Date: Sat, 27 May 2023 18:31:26 +0800 Message-ID: <20230527103126.398267-1-linmiaohe@huawei.com> X-Mailer: git-send-email 2.23.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.175.104.170] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To canpemm500002.china.huawei.com (7.192.104.244) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" The function mem_cgroup_from_obj() is not used anymore. Remove it and clean up relevant comments. Signed-off-by: Miaohe Lin Reviewed-by: Yosry Ahmed --- include/linux/memcontrol.h | 6 ------ mm/memcontrol.c | 31 ------------------------------- 2 files changed, 37 deletions(-) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 00a88cf947e1..ce8c2355ed9f 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -1813,7 +1813,6 @@ static inline int memcg_kmem_id(struct mem_cgroup *me= mcg) return memcg ? memcg->kmemcg_id : -1; } =20 -struct mem_cgroup *mem_cgroup_from_obj(void *p); struct mem_cgroup *mem_cgroup_from_slab_obj(void *p); =20 static inline void count_objcg_event(struct obj_cgroup *objcg, @@ -1876,11 +1875,6 @@ static inline int memcg_kmem_id(struct mem_cgroup *m= emcg) return -1; } =20 -static inline struct mem_cgroup *mem_cgroup_from_obj(void *p) -{ - return NULL; -} - static inline struct mem_cgroup *mem_cgroup_from_slab_obj(void *p) { return NULL; diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 6a3d4ce87b8a..532b29c9a0fe 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2972,37 +2972,6 @@ struct mem_cgroup *mem_cgroup_from_obj_folio(struct = folio *folio, void *p) /* * Returns a pointer to the memory cgroup to which the kernel object is ch= arged. * - * A passed kernel object can be a slab object, vmalloc object or a generic - * kernel page, so different mechanisms for getting the memory cgroup poin= ter - * should be used. - * - * In certain cases (e.g. kernel stacks or large kmallocs with SLUB) the c= aller - * can not know for sure how the kernel object is implemented. - * mem_cgroup_from_obj() can be safely used in such cases. - * - * The caller must ensure the memcg lifetime, e.g. by taking rcu_read_lock= (), - * cgroup_mutex, etc. - */ -struct mem_cgroup *mem_cgroup_from_obj(void *p) -{ - struct folio *folio; - - if (mem_cgroup_disabled()) - return NULL; - - if (unlikely(is_vmalloc_addr(p))) - folio =3D page_folio(vmalloc_to_page(p)); - else - folio =3D virt_to_folio(p); - - return mem_cgroup_from_obj_folio(folio, p); -} - -/* - * Returns a pointer to the memory cgroup to which the kernel object is ch= arged. - * Similar to mem_cgroup_from_obj(), but faster and not suitable for objec= ts, - * allocated using vmalloc(). - * * A passed kernel object must be a slab object or a generic kernel page. * * The caller must ensure the memcg lifetime, e.g. by taking rcu_read_lock= (), --=20 2.27.0