On 12/01/2016 10:02 PM, Michal Nazarewicz wrote:
On Thu, Dec 01 2016, Michal Hocko wrote:
I am not familiar with this code so I cannot really argue but a quick
look at rmem_cma_setup doesn't suggest any speicific placing or
anything...
early_cma parses ‘cma’ command line argument which can specify where
exactly the default CMA area is to be located. Furthermore, CMA areas
can be assigned per-device (via the Device Tree IIRC).
OK, but the context of this bug report is a generic cma pool and generic
dma alloc, which tries cma first and then fallback to
alloc_pages_node(). If a device really requires specific placing as you
suggest, then it probably uses a different allocation interface,
otherwise there would be some flag to disallow the alloc_pages_node()
fallback?
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