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: Andi Kleen <ak@suse.de>

---
 arch/x86_64/kernel/pci-nommu.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

Index: linux/arch/x86_64/kernel/pci-nommu.c
===================================================================
--- linux.orig/arch/x86_64/kernel/pci-nommu.c
+++ linux/arch/x86_64/kernel/pci-nommu.c
@@ -12,9 +12,10 @@ static int
 check_addr(char *name, struct device *hwdev, dma_addr_t bus, size_t size)
 {
         if (hwdev && bus + size > *hwdev->dma_mask) {
-		printk(KERN_ERR
-		    "nommu_%s: overflow %Lx+%lu of device mask %Lx\n",
-	       name, (long long)bus, size, (long long)*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);
 		return 0;
 	}
 	return 1;