On Thu, 23 Jun 2016, Stefano Stabellini wrote: > On Jun 23, 2016 8:27 AM, "Manjeet Pawar" <manjee...@samsung.com> wrote: > > > > From: Rohit Thapliyal <r.thapli...@samsung.com> > > > > 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 > > Signed-off-by: Rohit Thapliyal <r.thapli...@samsung.com> > > Signed-off-by: Ajeet Kumar Yadav <ajee...@samsung.com> > > --- > > 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 > > >