[PATCH 2/3] riscv: only enable ZONE_DMA32 for 64-bit

Christoph Hellwig hch at lst.de
Wed May 16 07:43:01 PDT 2018

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 at lst.de>
 arch/riscv/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 7817bbe0cfac..c4488ce8c2fa 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -48,7 +48,7 @@ config MMU
 config ZONE_DMA32
-	default y
+	default y if 64BIT

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