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dmarc=pass (policy=quarantine) header.from=suse.com X-Rspamd-Server: rspam06 X-Rspam-User: X-Stat-Signature: go9isp1g9okm8e3hadx4djwepyzcjx6u X-HE-Tag: 1664783913-129205 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri 30-09-22 19:14:33, Kamalesh Babulal wrote: > Replace the checks for memcg is root memcg, with mem_cgroup_is_root() > helper. > > Signed-off-by: Kamalesh Babulal Acked-by: Michal Hocko Thanks! > --- > mm/memcontrol.c | 20 ++++++++++---------- > 1 file changed, 10 insertions(+), 10 deletions(-) > > diff --git a/mm/memcontrol.c b/mm/memcontrol.c > index b69979c9ced5..99b3d0cbd426 100644 > --- a/mm/memcontrol.c > +++ b/mm/memcontrol.c > @@ -1148,7 +1148,7 @@ static void invalidate_reclaim_iterators(struct mem_cgroup *dead_memcg) > * cgroup root (root_mem_cgroup). So we have to handle > * dead_memcg from cgroup root separately. > */ > - if (last != root_mem_cgroup) > + if (!mem_cgroup_is_root(last)) > __invalidate_reclaim_iterators(root_mem_cgroup, > dead_memcg); > } > @@ -1172,7 +1172,7 @@ int mem_cgroup_scan_tasks(struct mem_cgroup *memcg, > struct mem_cgroup *iter; > int ret = 0; > > - BUG_ON(memcg == root_mem_cgroup); > + BUG_ON(mem_cgroup_is_root(memcg)); > > for_each_mem_cgroup_tree(iter, memcg) { > struct css_task_iter it; > @@ -1201,7 +1201,7 @@ void lruvec_memcg_debug(struct lruvec *lruvec, struct folio *folio) > memcg = folio_memcg(folio); > > if (!memcg) > - VM_BUG_ON_FOLIO(lruvec_memcg(lruvec) != root_mem_cgroup, folio); > + VM_BUG_ON_FOLIO(!mem_cgroup_is_root(lruvec_memcg(lruvec)), folio); > else > VM_BUG_ON_FOLIO(lruvec_memcg(lruvec) != memcg, folio); > } > @@ -1982,7 +1982,7 @@ struct mem_cgroup *mem_cgroup_get_oom_group(struct task_struct *victim, > rcu_read_lock(); > > memcg = mem_cgroup_from_task(victim); > - if (memcg == root_mem_cgroup) > + if (mem_cgroup_is_root(memcg)) > goto out; > > /* > @@ -2940,7 +2940,7 @@ static struct obj_cgroup *__get_obj_cgroup_from_memcg(struct mem_cgroup *memcg) > { > struct obj_cgroup *objcg = NULL; > > - for (; memcg != root_mem_cgroup; memcg = parent_mem_cgroup(memcg)) { > + for (; !mem_cgroup_is_root(memcg); memcg = parent_mem_cgroup(memcg)) { > objcg = rcu_dereference(memcg->objcg); > if (objcg && obj_cgroup_tryget(objcg)) > break; > @@ -7073,7 +7073,7 @@ void mem_cgroup_sk_alloc(struct sock *sk) > > rcu_read_lock(); > memcg = mem_cgroup_from_task(current); > - if (memcg == root_mem_cgroup) > + if (mem_cgroup_is_root(memcg)) > goto out; > if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && !memcg->tcpmem_active) > goto out; > @@ -7208,7 +7208,7 @@ static struct mem_cgroup *mem_cgroup_id_get_online(struct mem_cgroup *memcg) > * The root cgroup cannot be destroyed, so it's refcount must > * always be >= 1. > */ > - if (WARN_ON_ONCE(memcg == root_mem_cgroup)) { > + if (WARN_ON_ONCE(mem_cgroup_is_root(memcg))) { > VM_BUG_ON(1); > break; > } > @@ -7369,7 +7369,7 @@ long mem_cgroup_get_nr_swap_pages(struct mem_cgroup *memcg) > > if (cgroup_memory_noswap || !cgroup_subsys_on_dfl(memory_cgrp_subsys)) > return nr_swap_pages; > - for (; memcg != root_mem_cgroup; memcg = parent_mem_cgroup(memcg)) > + for (; !mem_cgroup_is_root(memcg); memcg = parent_mem_cgroup(memcg)) > nr_swap_pages = min_t(long, nr_swap_pages, > READ_ONCE(memcg->swap.max) - > page_counter_read(&memcg->swap)); > @@ -7391,7 +7391,7 @@ bool mem_cgroup_swap_full(struct page *page) > if (!memcg) > return false; > > - for (; memcg != root_mem_cgroup; memcg = parent_mem_cgroup(memcg)) { > + for (; !mem_cgroup_is_root(memcg); memcg = parent_mem_cgroup(memcg)) { > unsigned long usage = page_counter_read(&memcg->swap); > > if (usage * 2 >= READ_ONCE(memcg->swap.high) || > @@ -7556,7 +7556,7 @@ bool obj_cgroup_may_zswap(struct obj_cgroup *objcg) > return true; > > original_memcg = get_mem_cgroup_from_objcg(objcg); > - for (memcg = original_memcg; memcg != root_mem_cgroup; > + for (memcg = original_memcg; !mem_cgroup_is_root(memcg); > memcg = parent_mem_cgroup(memcg)) { > unsigned long max = READ_ONCE(memcg->zswap_max); > unsigned long pages; > > base-commit: 987a926c1d8a40e4256953b04771fbdb63bc7938 > -- > 2.34.3 -- Michal Hocko SUSE Labs