[PATCH] arm:swiotlb:keep disabled in default configuration

On Thu, 23 Jun 2016, Stefano Stabellini wrote:

On Jun 23, 2016 8:27 AM, "Manjeet Pawar" [off-list ref] wrote:

quoted

From: Rohit Thapliyal <redacted>

swiotlb implementation not required to be enabled in arm and
disabling it reduces uImage size by 16KB.

How so? There are no DMA operations on ARM?

Xen actively uses the swiotlb on ARM, see

arch/arm64/include/asm/dma-mapping.h:get_dma_ops
arch/arm/xen/mm.c:xen_swiotlb_dma_ops

quoted

Signed-off-by: Rohit Thapliyal <redacted>
Signed-off-by: Ajeet Kumar Yadav <redacted>
---
 arch/arm/Kconfig |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 90542db..ae65f29 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig

@@ -1754,7 +1754,7 @@ config SECCOMP
          defined by each seccomp mode.

 config SWIOTLB
-       def_bool y
+       def_bool n

 config IOMMU_HELPER
        def_bool SWIOTLB
--

1.7.9.5