[RFC PATCH] ARM: dma: default ZONE_DMA to y if ARM_LPAE

Will Deacon will.deacon at arm.com
Fri Jul 26 09:05:51 EDT 2013

On systems running with LPAE enabled, DMA masters capable only of 32-bit
addressing require ZONE_DMA to be set. Given the proliferation of such
masters, and the tendency to re-use existing system IP with newer
processors, this patch defaults ZONE_DMA to y if ARM_LPAE, rather than
force each SoC to select it individually.

Cc: Olof Johansson <olof at lixom.net>
Signed-off-by: Will Deacon <will.deacon at arm.com>
 arch/arm/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 82f06982..7fede35 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -192,6 +192,7 @@ config ARCH_MAY_HAVE_PC_FDC
 config ZONE_DMA
+	default y if ARM_LPAE
        def_bool y

More information about the linux-arm-kernel mailing list