mm: mem_reliable: Fix reliable page counter mismatch problem

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I77BDW
CVE: NA

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

During copy_present_pte, rss counter is increased but the corresponding
reliable page counter is not updated. This will lead to reliable page
counter mismatch. Fix this by adding reliable page counter.

Fixes: d81e9624 ("proc: Count reliable memory usage of reliable tasks")
Signed-off-by: NMa Wupeng <mawupeng1@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: NNanyong Sun <sunnanyong@huawei.com>

mm/memory.c

@@ -887,6 +887,7 @@ copy_present_pte(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma,
 		get_page(page);
 		page_dup_rmap(page, false);
 		rss[mm_counter(page)]++;
+		reliable_page_counter(page, dst_vma->vm_mm, 1);
 	}
 
 	/*