mirror of https://github.com/torvalds/linux.git
33dcb37cef
All the way back to introducing dma_common_mmap we've defaulted to mark
the pages as uncached. But this is wrong for DMA coherent devices.
Later on DMA_ATTR_WRITE_COMBINE also got incorrect treatment as that
flag is only treated special on the alloc side for non-coherent devices.
Introduce a new dma_pgprot helper that deals with the check for coherent
devices so that only the remapping cases ever reach arch_dma_mmap_pgprot
and we thus ensure no aliasing of page attributes happens, which makes
the powerpc version of arch_dma_mmap_pgprot obsolete and simplifies the
remaining ones.
Note that this means arch_dma_mmap_pgprot is a bit misnamed now, but
we'll phase it out soon.
Fixes:
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|---|---|---|
| .. | ||
| Kconfig | ||
| Makefile | ||
| coherent.c | ||
| contiguous.c | ||
| debug.c | ||
| direct.c | ||
| dummy.c | ||
| mapping.c | ||
| remap.c | ||
| swiotlb.c | ||
| virt.c | ||