Hello,
On Tuesday, May 29, 2012 2:30 PM Russell King - ARM Linux wrote:
I notice we have new warnings as a result of CMA being merged, though thankfully they're just in Kconfig:
warning: (ARM) selects CMA which has unmet direct dependencies (HAVE_DMA_CONTIGUOUS && HAVE_MEMBLOCK && EXPERIMENTAL)
This seems totally weird: you're mandating that ARM must have CMA selected, but it's an experimental feature? So you're implying that the entire ARM kernel becomes totally experimental for the next release cycle?
I think this needs fixing.
No, that wasn't my intention. I will provide a patch which removes unconditional dependency on CMA - it will let one to disable CMA and use old allocation method if needed, but this requires a few more changes in the dma-mapping implementation. I wasn't aware of the consequences and no one has complained about this since v15 of CMA patches (Aug 2011).
Best regards