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Commit 0803e605 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Thomas Gleixner
Browse files

swiotlb: Make swiotlb_{alloc,free}_buffer depend on CONFIG_DMA_DIRECT_OPS 



Otherwise this causes unused symbol warnings for configs that build
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: 16e73adb ("dma/swiotlb: Remove swiotlb_{alloc,free}_coherent()")
Reported-by: default avatarStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: iommu@lists.linux-foundation.org
Cc: konrad.wilk@oracle.com
Link: https://lkml.kernel.org/r/20180323174930.17767-1-hch@lst.de
parent 16e73adb

lib/swiotlb.c

+2 −0
Original line number Diff line number Diff line
@@ -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,