From 4dead48bc7641edf5bd91c944ec69f49ea0855a6 Mon Sep 17 00:00:00 2001 From: Steven Capper Date: Tue, 18 Feb 2014 16:56:55 +0100 Subject: [PATCH] ARM: 7979/1: mm: Remove hugetlb warning from Coherent DMA allocator The Coherant DMA allocator allocates pages of high order then splits them up into smaller pages. This splitting logic would run into problems if the allocator was given compound pages. Thus the Coherant DMA allocator was originally incompatible with compound pages existing and, by extension, huge pages. A compile #error was put in place whenever huge pages were enabled. Compatibility with compound pages has since been introduced by the following commit (which merely excludes GFP_COMP pages from being requested by the coherant DMA allocator): ea2e705 ARM: 7172/1: dma: Drop GFP_COMP for DMA memory allocations When huge page support was introduced to ARM, the compile #error in dma-mapping.c was replaced by a #warning when it should have been removed instead. This patch removes the compile #warning in dma-mapping.c when huge pages are enabled. Signed-off-by: Steve Capper Signed-off-by: Russell King --- arch/arm/mm/dma-mapping.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index 0670365deaf7..775903edde17 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -218,9 +218,6 @@ static void __dma_free_buffer(struct page *page, size_t size) } #ifdef CONFIG_MMU -#ifdef CONFIG_HUGETLB_PAGE -#warning ARM Coherent DMA allocator does not (yet) support huge TLB -#endif static void *__alloc_from_contiguous(struct device *dev, size_t size, pgprot_t prot, struct page **ret_page); -- 2.39.2