--- zzzz-none-000/linux-4.4.60/arch/mips/mm/cache.c	2017-04-08 07:53:53.000000000 +0000
+++ scorpion-7490-727/linux-4.4.60/arch/mips/mm/cache.c	2021-02-04 17:41:59.000000000 +0000
@@ -39,6 +39,8 @@
 
 void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
 EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range);
+EXPORT_SYMBOL(flush_cache_all);
+EXPORT_SYMBOL(__flush_cache_all);
 void (*__invalidate_kernel_vmap_range)(unsigned long vaddr, int size);
 
 /* MIPS specific cache operations */
@@ -59,6 +61,8 @@
 void (*_dma_cache_inv)(unsigned long start, unsigned long size);
 
 EXPORT_SYMBOL(_dma_cache_wback_inv);
+EXPORT_SYMBOL(_dma_cache_inv);
+EXPORT_SYMBOL(_dma_cache_wback);
 
 #endif /* CONFIG_DMA_NONCOHERENT || CONFIG_DMA_MAYBE_COHERENT */