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

[Christoph Hellwig]

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
 	bool
-	default y
+	default y if 64BIT
 
 config PAGE_OFFSET
 	hex
-- 
2.17.0