On Fri, Dec 7, 2018 at 11:08 AM Christoph Hellwig <hch@xxxxxx> wrote: > > Instead of providing a special dma_mark_clean hook just for ia64, switch > ia64 to use the normal arch_sync_dma_for_cpu hooks instead. > > This means that we now also set the PG_arch_1 bit for pages in the > swiotlb buffer, which isn't stricly needed as we will never execute code > out of the swiotlb buffer, but otherwise harmless. ia64 build based on arch/ia64/configs/zx1_defconfig now fails with undefined symbols arch_dma_alloc and arch_dma_free (used by kernel/dma/direct.c). This config doesn't define CONFIG_SWIOTLB, so we don't get the benefit of the routines in arch/ia64/kernel/dma-mapping.c -Tony
