From mboxrd@z Thu Jan 1 00:00:00 1970 From: Miaohe Lin 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> Mime-Version: 1.0 Content-Transfer-Encoding: 7BIT Return-path: List-ID: Content-Type: text/plain; charset="us-ascii" To: hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org, mhocko-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, roman.gushchin-fxUVXftIFDnyG1zEObXtfA@public.gmane.org, shakeelb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org Cc: muchun.song-fxUVXftIFDnyG1zEObXtfA@public.gmane.org, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linmiaohe-hv44wF8Li93QT0dZR+AlfA@public.gmane.org The function mem_cgroup_from_obj() is not used anymore. Remove it and clean up relevant comments. Signed-off-by: Miaohe Lin --- 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 *memcg) return memcg ? memcg->kmemcg_id : -1; } -struct mem_cgroup *mem_cgroup_from_obj(void *p); struct mem_cgroup *mem_cgroup_from_slab_obj(void *p); static inline void count_objcg_event(struct obj_cgroup *objcg, @@ -1876,11 +1875,6 @@ static inline int memcg_kmem_id(struct mem_cgroup *memcg) return -1; } -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 charged. * - * A passed kernel object can be a slab object, vmalloc object or a generic - * kernel page, so different mechanisms for getting the memory cgroup pointer - * should be used. - * - * In certain cases (e.g. kernel stacks or large kmallocs with SLUB) the caller - * 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 = page_folio(vmalloc_to_page(p)); - else - folio = 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 charged. - * Similar to mem_cgroup_from_obj(), but faster and not suitable for objects, - * 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(), -- 2.27.0