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To: "Bryan O'Sullivan" <bos@pathscale.com>
Cc: openib-general@openib.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2 of 13] ipath - set up 32-bit DMA mask if 64-bit setup fails
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References: <1906950392f7ef8c7d07.1145913778@eng-12.pathscale.com>
From: Roland Dreier <rdreier@cisco.com>
Date: Mon, 01 May 2006 11:47:32 -0700
In-Reply-To: <1906950392f7ef8c7d07.1145913778@eng-12.pathscale.com> (Bryan O'Sullivan's message of "Mon, 24 Apr 2006 14:22:58 -0700")
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    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.