[PATCH 0/3] dma-mapping:remove CONFIG_HAVE_DMA_ATTRS

[tom . leiming]

This patch sets  enable CONFIG_HAVE_DMA_ATTRS always, so remove
it in dma-mapping and Kconfig of X86 and IA64 arch, based on
the following ideas:

1,Currently asm-generic/dma-mapping-common.h has provided dma_map_*_attrs()
and dma_unmap_*_attrs(), and more ARCHs will move to asm-generic/dma-mapping-common.h;

2,Disabling CONFIG_HAVE_DMA_ATTRS may lead to a compile failure;

3,X86 and IA64 has taken asm-generic/dma-mapping-common.h and always enabled the
option now;

4,If CONFIG_HAVE_DMA_ATTRS is enabled, dma_set/get_attr support the passed attrs
is NULL.


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