[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: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 4 insertions, 3 deletions

diff --git a/arch/x86_64/kernel/pci-nommu.c b/arch/x86_64/kernel/pci-nommu.c
index 44adcc2d5e5b..1f6ecc62061d 100644
--- a/arch/x86_64/kernel/pci-nommu.c
+++ b/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;