[PATCH] x86_64: Don't warn for overflow in nommu case when dma_mask is < 32bit

This triggers for b44's 1GB DMA workaround which tries to map
first and then bounces.

The 32bit heuristic is reasonable because the IOMMU doesn't attempt
to handle < 32bit masks anyways.
Signed-off-by: NAndi Kleen <ak@suse.de>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

arch/x86_64/kernel/pci-nommu.c

@@ -12,6 +12,7 @@ static int
 check_addr(char *name, struct device *hwdev, dma_addr_t bus, size_t size)
 {
         if (hwdev && bus + size > *hwdev->dma_mask) {
+		if (*hwdev->dma_mask >= 0xffffffffULL)
 			printk(KERN_ERR
 			    "nommu_%s: overflow %Lx+%lu of device mask %Lx\n",
 	       			name, (long long)bus, size, (long long)*hwdev->dma_mask);