memcontrol: Add oom recover for kmemcg when release buddy hugepage

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I63SDZ

-------------------------------

In Ascend, we use tmp hugepage and disable OOM-killer, when we cause a OOM,
and after some time, the memory is enough for process, the process will not
return to run normal. In this case, we must use oom recover to let the
process run.
Signed-off-by: NJian Zhang <zhangjian210@huawei.com>

mm/memcontrol.c

@@ -3116,12 +3116,23 @@ void __memcg_kmem_uncharge_page(struct page *page, int order)
 {
 	struct obj_cgroup *objcg;
 	unsigned int nr_pages = 1 << order;
+#ifdef CONFIG_ASCEND_FEATURES
+	struct mem_cgroup *memcg;
+#endif
 
 	if (!PageMemcgKmem(page))
 		return;
 
 	objcg = __page_objcg(page);
 	obj_cgroup_uncharge_pages(objcg, nr_pages);
+
+#ifdef CONFIG_ASCEND_FEATURES
+	memcg = get_mem_cgroup_from_objcg(objcg);
+	if (!mem_cgroup_is_root(memcg))
+		memcg_oom_recover(memcg);
+	css_put(&memcg->css);
+#endif
+
 	page->memcg_data = 0;
 	obj_cgroup_put(objcg);
 }