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authorVladimir Murzin <vladimir.murzin@arm.com>2017-06-28 10:16:57 +0100
committerChristoph Hellwig <hch@lst.de>2017-06-30 10:03:07 -0700
commit07c75d7a6b9eae24ab72c6eb2fbd39963775b0bf (patch)
tree463fc188df21de87c3cef87b4eab54438805c86e /arch/sh/Kconfig
parentdrivers: dma-coherent: Introduce default DMA pool (diff)
downloadlinux-dev-07c75d7a6b9eae24ab72c6eb2fbd39963775b0bf.tar.xz
linux-dev-07c75d7a6b9eae24ab72c6eb2fbd39963775b0bf.zip
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 <realmz6@gmail.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Michal Simek <monstr@monstr.eu> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Rich Felker <dalias@libc.org> Cc: Chris Zankel <chris@zankel.net> Cc: Max Filippov <jcmvbkbc@gmail.com> Suggested-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com> Tested-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Diffstat (limited to '')
-rw-r--r--arch/sh/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index ee086958b2b2..640a85925060 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -2,6 +2,7 @@ config SUPERH
def_bool y
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_MIGHT_HAVE_PC_PARPORT
+ select ARCH_NO_COHERENT_DMA_MMAP if !MMU
select HAVE_PATA_PLATFORM
select CLKDEV_LOOKUP
select HAVE_IDE if HAS_IOPORT_MAP