From 07c75d7a6b9eae24ab72c6eb2fbd39963775b0bf Mon Sep 17 00:00:00 2001 From: Vladimir Murzin Date: Wed, 28 Jun 2017 10:16:57 +0100 Subject: drivers: dma-mapping: allow dma_common_mmap() for NOMMU Currently, internals of dma_common_mmap() is compiled out if build is done for either NOMMU or target which explicitly says it does not have/want coherent DMA mmap. It turned out that dma_common_mmap() can be handy in NOMMU setup (at least for ARM). This patch converts exitent NOMMU targets to use ARCH_NO_COHERENT_DMA_MMAP, thus when CONFIG_MMU is gone from dma_common_mmap() their behaviour stays unchanged. ARM is not converted to ARCH_NO_COHERENT_DMA_MMAP because it 1) already has mmap callback which can handle (at some extent) NOMMU 2) already defines dummy pgprot_noncached() for NOMMU build. c6x and frv stay untouched since they already have ARCH_NO_COHERENT_DMA_MMAP. Cc: Steven Miao Cc: Geert Uytterhoeven Cc: Michal Simek Cc: Yoshinori Sato Cc: Rich Felker Cc: Chris Zankel Cc: Max Filippov Suggested-by: Christoph Hellwig Signed-off-by: Vladimir Murzin Tested-by: Benjamin Gaignard --- arch/m32r/Kconfig | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/m32r/Kconfig') diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig index 95474460b367..87cde1e4b38c 100644 --- a/arch/m32r/Kconfig +++ b/arch/m32r/Kconfig @@ -19,6 +19,7 @@ config M32R select HAVE_DEBUG_STACKOVERFLOW select CPU_NO_EFFICIENT_FFS select DMA_NOOP_OPS + select ARCH_NO_COHERENT_DMA_MMAP if !MMU config SBUS bool -- cgit v1.2.3