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| author | Vladimir Murzin <vladimir.murzin@arm.com> | 2017-06-28 10:16:57 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2017-06-30 10:03:07 -0700 |
| commit | 07c75d7a6b9eae24ab72c6eb2fbd39963775b0bf (patch) | |
| tree | 463fc188df21de87c3cef87b4eab54438805c86e /arch/xtensa | |
| parent | 93228b44c33a572cb36cec2dbed42e9bdbc88d79 (diff) | |
| download | linux-07c75d7a6b9eae24ab72c6eb2fbd39963775b0bf.tar.bz2 | |
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 'arch/xtensa')
| -rw-r--r-- | arch/xtensa/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index f4126cf997a4..7ad6d77b2f22 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -3,6 +3,7 @@ config ZONE_DMA config XTENSA def_bool y + select ARCH_NO_COHERENT_DMA_MMAP if !MMU select ARCH_WANT_FRAME_POINTERS select ARCH_WANT_IPC_PARSE_VERSION select BUILDTIME_EXTABLE_SORT |