On Wed, Jan 2, 2019 at 11:23 PM Christoph Hellwig <hch@xxxxxx> wrote: > I think something like the patch below should fix it: > > diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig > index ccd56f5df8cd..8d7396bd1790 100644 > --- a/arch/ia64/Kconfig > +++ b/arch/ia64/Kconfig > @@ -31,7 +31,7 @@ config IA64 > select HAVE_MEMBLOCK_NODE_MAP > select HAVE_VIRT_CPU_ACCOUNTING > select ARCH_HAS_DMA_COHERENT_TO_PFN if SWIOTLB > - select ARCH_HAS_SYNC_DMA_FOR_CPU > + select ARCH_HAS_SYNC_DMA_FOR_CPU if SWIOTLB Close. But no cigar. Now I get: CC arch/ia64/mm/init.o arch/ia64/mm/init.c:75:6: error: redefinition of ‘arch_sync_dma_for_cpu’ ./include/linux/dma-noncoherent.h:61:20: note: previous definition of ‘arch_sync_dma_for_cpu’ was here make[1]: *** [arch/ia64/mm/init.o] Error 1 make: *** [arch/ia64/mm/init.o] Error 2 -Tony
