Re: [PATCH v2 4/4] ARC: don't check for HIGHMEM pages in arch_dma_alloc

On Mon, Jul 30, 2018 at 07:26:36PM +0300, Eugeniy Paltsev wrote: > __GFP_HIGHMEM flag is cleared by upper layer functions > (in include/linux/dma-mapping.h) so we'll never get a > __GFP_HIGHMEM flag in arch_dma_alloc gfp argument. > That's why alloc_pages will never return highmem page > here. > >

[PATCH v2 4/4] ARC: don't check for HIGHMEM pages in arch_dma_alloc

__GFP_HIGHMEM flag is cleared by upper layer functions (in include/linux/dma-mapping.h) so we'll never get a __GFP_HIGHMEM flag in arch_dma_alloc gfp argument. That's why alloc_pages will never return highmem page here. Get rid of highmem pages handling and cleanup arch_dma_alloc and arch_dma_free