[Linaro-mm-sig] [PATCH 7/8] common: dma-mapping: change alloc/free_coherent method to more generic alloc/free_attrs

KyongHo Cho pullip.cho at samsung.com
Mon Jun 20 15:14:14 UTC 2011


On Tue, Jun 21, 2011 at 12:06 AM, Russell King - ARM Linux
<linux at arm.linux.org.uk> wrote:
> Wrong - there is a difference.  For pre-ARMv6 CPUs, it returns memory
> with different attributes from DMA coherent memory.
>
> And we're not going to sweep away pre-ARMv6 CPUs any time soon.  So
> you can't ignore dma_alloc_writecombine() which must remain to sanely
> support framebuffers.
>
OK. Thanks.

Then, I think we can implement dma_alloc_writecombine() away from dma_map_ops.
IMHO, those devices that use dma_alloc_writecombine() are enough with
the default dma_map_ops.
Removing a member from dma_map_ops is too heavy work.



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