--- 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