share_pool: Add VM_SHARE_POOL flag for vm_area_struct

ascend inclusion
category: Feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4NDAW
CVE: NA

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

This flag specify that the vm_area_struct is related to share_pool (in
detail, has a spa corresponding to it).
Signed-off-by: NWang Wensheng <wangwensheng4@huawei.com>
Signed-off-by: NTang Yizhou <tangyizhou@huawei.com>
Reviewed-by: Kefeng Wang<wangkefeng.wang@huawei.com>
Reviewed-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

include/linux/mm.h

@@ -378,6 +378,12 @@ extern unsigned int kobjsize(const void *objp);
 # define VM_MTE_ALLOWED	VM_NONE
 #endif
 
+#if defined(CONFIG_ASCEND_SHARE_POOL)
+# define VM_SHARE_POOL VM_HIGH_ARCH_4
+#else
+# define VM_SHARE_POOL VM_NONE
+#endif
+
 #ifndef VM_GROWSUP
 # define VM_GROWSUP	VM_NONE
 #endif

include/linux/share_pool.h

@@ -272,6 +272,14 @@ static inline void sp_area_work_around(struct vm_unmapped_area_info *info,
 		info->high_limit = min(info->high_limit, MMAP_SHARE_POOL_START);
 }
 
+static inline bool sp_check_vm_share_pool(unsigned long vm_flags)
+{
+	if (sp_is_enabled() && (vm_flags & VM_SHARE_POOL))
+		return true;
+
+	return false;
+}
+
 #else /* CONFIG_ASCEND_SHARE_POOL */
 
 static inline int mg_sp_group_add_task(int pid, unsigned long prot, int spg_id)