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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: 16e73adbca ("dma/swiotlb: Remove swiotlb_{alloc,free}_coherent()")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Thomas 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
This commit is contained in:
Christoph Hellwig 2018-03-23 18:49:30 +01:00 committed by Thomas Gleixner
parent 16e73adbca
commit 0803e6051c
1 changed files with 2 additions and 0 deletions
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2
lib/swiotlb.c
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@ -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,