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riscv: only enable ZONE_DMA32 for 64-bit 

Until we actually support > 32bit physical addresses for 32-bit using
highmem there is no point in enabling ZONE_DMA32.  And even if such
support is ever added it probably should be conditional to not burden
low end embedded devices.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Christoph Hellwig 2018-04-27 08:41:09 +02:00
parent c3e4ed012b
commit f1306f0423
1 changed files with 1 additions and 1 deletions
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arch/riscv/Kconfig
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@ -48,7 +48,7 @@ config MMU
config ZONE_DMA32
bool
default y
default y if 64BIT
config PAGE_OFFSET
hex