Commit ca77a8f5 authored Mar 26, 2018 by Charan Teja Reddy

mm: increase the count of dma_mmu_remap areas

Increase the count of mmu remap areas in dma_mmu_remap to provide the
space for the carveout region with fixup. Otherwise when configured
CMA areas touch MAX_CMA_AREAS, it results in undefined behaviour due to
last cma area encroaching into fixup area. This undefined behaviour is
because of the section mappings of the last cma, where we end up in
using with out clearing it's PTE's.

Change-Id: Ibbb2557022e2b123338d80be317877c2dcf7b9f1
Signed-off-by: Charan Teja Reddy <charante@codeaurora.org>

parent 3afabc36

arch/arm64/mm/mmu.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -67,7 +67,10 @@ struct dma_contig_early_reserve {
		unsigned long size;
		};

		static struct dma_contig_early_reserve dma_mmu_remap[MAX_CMA_AREAS];
		/* allocate the memory for the fixup regions as well */
		#define MAX_FIXUP_AREAS MAX_CMA_AREAS
		static struct dma_contig_early_reserve
		dma_mmu_remap[MAX_CMA_AREAS + MAX_FIXUP_AREAS];
		static int dma_mmu_remap_num;

		void __init dma_contiguous_early_fixup(phys_addr_t base, unsigned long size)