--- zzzz-none-000/linux-3.10.107/arch/arm/mm/proc-syms.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/arm/mm/proc-syms.c	2021-02-04 17:41:59.000000000 +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