mm/sharepool: bugfix for 2M U2K

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5PZDX
CVE: NA

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

We could determine if a userspace map is huge-mapped after walking its
pagetable. So the uva_align should be calculated again after walking
the pagetable if it is huge-mapped.
Signed-off-by: NZhou Guanghui <zhouguanghui1@huawei.com>

mm/share_pool.c

@@ -3188,6 +3188,9 @@ static int __sp_walk_page_range(unsigned long uva, unsigned long size,
 		sp_walk_data->pages = NULL;
 	}
 
+	if (sp_walk_data->is_hugepage)
+		sp_walk_data->uva_aligned = ALIGN_DOWN(uva, PMD_SIZE);
+
 	return ret;
 }