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On an iMac G5, the b43 driver is failing to initialise because trying to set the dma mask to 30-bit fails. Even though there's only 512MiB of RAM in the machine anyway: https://bugzilla.redhat.com/show_bug.cgi?id=514787 We should probably let it succeed if the available RAM in the system doesn't exceed the requested limit. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>