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SubjectRe: [PATCH 2 of 13] ipath - set up 32-bit DMA mask if 64-bit setup fails
    Bryan> Some systems do not set up 64-bit maps on systems with 2GB
Bryan> or less of memory installed, so we have to fall back to
Bryan> trying a 32-bit setup.

Which systems does this happen on? I'm just curious, because mthca has

err = pci_set_dma_mask(pdev, DMA_64BIT_MASK);
if (err) {
dev_warn(&pdev->dev, "Warning: couldn't set 64-bit PCI DMA mask.\n");

and I've never had a single report of that warning triggering.

- R.
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