ARC: dma: non-coherent pages need V-P mapping if in HIGHMEM

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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>

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This commit is contained in:

Vineet Gupta 2016-03-14 15:34:36 +05:30

parent d98a15a565

commit 6b7003930e

1 changed files with 32 additions and 15 deletions

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arch/arc/mm/dma.c

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