Re: CMA alignment question

[Michal Nazarewicz]

> On Tue, Nov 04 2014, Gregory Fong wrote:
>> The alignment in cma_alloc() is done w.r.t. the bitmap.  This is a
>> problem when, for example:
>>
>> - a device requires 16M (order 12) alignment
>> - the CMA region is not 16 M aligned

On Wed, Nov 05 2014, Weijie Yang wrote:
> I think the device driver should ensure that situation could not occur,
> by assign suitable alignment parameter in cma_declare_contiguous().

What about default CMA area? Besides, I think principle of least
surprise applies here and alignment should be physical.

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