On Fri, Mar 23, 2018 at 06:49:30PM +0100, Christoph Hellwig wrote: > Otherwise we might get unused symbol warnings for configs that built > swiotlb.c only for use by xen-swiotlb.c and that don't otherwise select > CONFIG_DMA_DIRECT_OPS, which is possible on arm. > > Fixes: 16e73adbca76 ("dma/swiotlb: Remove swiotlb_{alloc,free}_coherent()") > Reported-by: Stephen Rothwell <s...@canb.auug.org.au> > Signed-off-by: Christoph Hellwig <h...@lst.de>
Alternatively could we set the Kconfig to slect DMA_DIRECT_OPS? > --- > lib/swiotlb.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/lib/swiotlb.c b/lib/swiotlb.c > index 15954b86f09e..47aeb04c1997 100644 > --- a/lib/swiotlb.c > +++ b/lib/swiotlb.c > @@ -692,6 +692,7 @@ void swiotlb_tbl_sync_single(struct device *hwdev, > phys_addr_t tlb_addr, > } > } > > +#ifdef CONFIG_DMA_DIRECT_OPS > static inline bool dma_coherent_ok(struct device *dev, dma_addr_t addr, > size_t size) > { > @@ -763,6 +764,7 @@ static bool swiotlb_free_buffer(struct device *dev, > size_t size, > DMA_ATTR_SKIP_CPU_SYNC); > return true; > } > +#endif > > static void > swiotlb_full(struct device *dev, size_t size, enum dma_data_direction dir, > -- > 2.14.2 > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu