On 12/14/2016 12:45 PM, Rob Herring wrote: > On Wed, Nov 23, 2016 at 5:37 AM, Jason Liu <[email protected]> wrote: >> Need ensure the cma reserved region not cross the low/high memory boundary >> when using the dynamic allocation methond through device-tree, otherwise, >> kernel will fail to boot up when cma reserved region cross how/high mem. > > The kernel command line code setting CMA already deals with this. Why > don't we just call the CMA code (cma_declare_contiguous) to deal with > this? > > Rob >
That was proposed in the first version[1] but I think this is a generic problem not specific to CMA. Even non-CMA reservations trying to span zones could cause problems so the devicetree allocation code should restrict reservations to a single zone. Thanks, Laura [1] https://marc.info/?l=linux-kernel&m=147928325113103&w=2
