--- zzzz-none-000/linux-4.4.60/arch/arm/mm/proc-syms.c	2017-04-08 07:53:53.000000000 +0000
+++ jet-2400-727/linux-4.4.60/arch/arm/mm/proc-syms.c	2021-03-17 14:36:41.000000000 +0000
@@ -30,6 +30,9 @@
 EXPORT_SYMBOL(__cpuc_flush_user_range);
 EXPORT_SYMBOL(__cpuc_coherent_kern_range);
 EXPORT_SYMBOL(__cpuc_flush_dcache_area);
+EXPORT_SYMBOL(dmac_inv_range);
+EXPORT_SYMBOL(dmac_clean_range);
+EXPORT_SYMBOL(dmac_flush_range);
 #else
 EXPORT_SYMBOL(cpu_cache);
 #endif