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author | Christoph Hellwig <hch@lst.de> | 2016-01-20 15:01:22 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-20 17:09:18 -0800 |
commit | 0d4a619b64bad7117947a84a10c17a2b8f14d252 (patch) | |
tree | 07ce1a6bfc43b0e0fb54f3231923c1f893938ff8 /drivers/base | |
parent | f9ed89e17ee7d1f5f25615bb0080b9a3ff1bb5f0 (diff) | |
download | linux-0d4a619b64bad7117947a84a10c17a2b8f14d252.tar.gz |
dma-mapping: make the generic coherent dma mmap implementation optional
This series converts all remaining architectures to use dma_map_ops and the generic implementation of the DMA API. This not only simplifies the code a lot, but also prepares for possible future changes like more generic non-iommu dma_ops implementations or generic per-device dma_map_ops. This patch (of 16): We have a couple architectures that do not want to support this code, so add another Kconfig symbol that disables the code similar to what we do for the nommu case. Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Haavard Skinnemoen <hskinnemoen@gmail.com> Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no> Cc: Steven Miao <realmz6@gmail.com> Cc: Ley Foon Tan <lftan@altera.com> Cc: David Howells <dhowells@redhat.com> Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> Cc: Chris Metcalf <cmetcalf@ezchip.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Aurelien Jacquiot <a-jacquiot@ti.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Helge Deller <deller@gmx.de> Cc: James Hogan <james.hogan@imgtec.com> Cc: Jesper Nilsson <jesper.nilsson@axis.com> Cc: Mark Salter <msalter@redhat.com> Cc: Mikael Starvik <starvik@axis.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Joerg Roedel <jroedel@suse.de> Cc: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/base')
-rw-r--r-- | drivers/base/dma-mapping.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c index d95c5971c225..381e39d5204e 100644 --- a/drivers/base/dma-mapping.c +++ b/drivers/base/dma-mapping.c @@ -247,7 +247,7 @@ int dma_common_mmap(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, dma_addr_t dma_addr, size_t size) { int ret = -ENXIO; -#ifdef CONFIG_MMU +#if defined(CONFIG_MMU) && !defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) unsigned long user_count = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT; unsigned long pfn = page_to_pfn(virt_to_page(cpu_addr)); @@ -264,7 +264,7 @@ int dma_common_mmap(struct device *dev, struct vm_area_struct *vma, user_count << PAGE_SHIFT, vma->vm_page_prot); } -#endif /* CONFIG_MMU */ +#endif /* CONFIG_MMU && !CONFIG_ARCH_NO_COHERENT_DMA_MMAP */ return ret; } |