ARC: dma: non-coherent pages need V-P mapping if in HIGHMEM
Previously a non-coherent page (hardware IOC or simply driver needs)
could be handled by cpu with paddr alone (kvaddr used to be needed for
coherent mappings to enforce uncached semantics via a MMU mapping).
Now however such a page might still require a V-P mapping if it was in
physical address space > 32bits due to PAE40, which the CPU can't access
directly with a paddr
So decouple decision of kvaddr allocation from type of alloc request
(coh/non-coh)
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
1 file changed