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>
2018-04-27 08:41:09 +02:00 · 2018-04-27 08:41:09 +02:00 · f1306f0423
commit f1306f0423
parent c3e4ed012b
1 changed files with 1 additions and 1 deletions
--- 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