Commit 07c75d7a authored by Vladimir Murzin's avatar Vladimir Murzin Committed by Christoph Hellwig
Browse files

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: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarVladimir Murzin <vladimir.murzin@arm.com>
Tested-by: default avatarBenjamin Gaignard <benjamin.gaignard@linaro.org>
parent 93228b44

arch/blackfin/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -41,6 +41,7 @@ config BLACKFIN 
	select MODULES_USE_ELF_RELA

	select HAVE_DEBUG_STACKOVERFLOW

	select HAVE_NMI

	select ARCH_NO_COHERENT_DMA_MMAP



config GENERIC_CSUM

	def_bool y

arch/m32r/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/m68k/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ config M68K 
	bool

	default y

	select ARCH_MIGHT_HAVE_PC_PARPORT if ISA

	select ARCH_NO_COHERENT_DMA_MMAP if !MMU

	select HAVE_IDE

	select HAVE_AOUT if MMU

	select HAVE_DEBUG_BUGVERBOSE

arch/microblaze/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ config MICROBLAZE 
	def_bool y

	select ARCH_HAS_GCOV_PROFILE_ALL

	select ARCH_MIGHT_HAVE_PC_PARPORT

	select ARCH_NO_COHERENT_DMA_MMAP if !MMU

	select ARCH_WANT_IPC_PARSE_VERSION

	select BUILDTIME_EXTABLE_SORT

	select CLKSRC_OF

arch/sh/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

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