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Coldfire cores configured with a data cache can't provide coherent
DMA allocations at all.
Instead of returning non-coherent kernel memory in this case,
return NULL and fail the allocation.
The only driver that used to rely on the previous behavior (fec) has
been switched to use non-coherent allocations for this case recently.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Greg Ungerer <gerg@linux-m68k.org>
Tested-by: Greg Ungerer <gerg@linux-m68k.org>
7a360df941