arm64/ascend: Add set hugepage number helper function

ascend inclusion
category: feature
bugzilla: NA
CVE: NA

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

Add helper function for change system hugepage nr, and export it out.
Signed-off-by: NWeilong Chen <chenweilong@huawei.com>
Reviewed-by: NDing Tianhong <dingtianhong@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

mm/hugetlb.c

@@ -3068,6 +3068,19 @@ int hugetlb_sysctl_handler(struct ctl_table *table, int write,
 							buffer, length, ppos);
 }
 
+#ifdef CONFIG_ASCEND_AUTO_TUNING_HUGEPAGE
+int hugetlb_sysctl_store(size_t length)
+{
+	int ret;
+	struct hstate *h = &default_hstate;
+
+	ret = __nr_hugepages_store_common(false, h, NUMA_NO_NODE, length,
+					  length);
+	return ret;
+}
+EXPORT_SYMBOL(hugetlb_sysctl_store);
+#endif
+
 #ifdef CONFIG_NUMA
 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *table, int write,
 			  void __user *buffer, size_t *length, loff_t *ppos)