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Date: Tue, 4 Dec 2007 13:49:07 -0800 From: Gary Hade <garyhade@...ibm.com> To: "Jun'ichi Nomura" <j-nomura@...jp.nec.com> Cc: linux-kernel@...r.kernel.org, linux-pci@...ey.karlin.mff.cuni.cz, Greg KH <gregkh@...e.de>, jbeulich@...ell.com Subject: Re: [PATCH] pci: Omit error message for benign allocation failure On Tue, Dec 04, 2007 at 02:35:48PM -0500, Jun'ichi Nomura wrote: > Hi, > > On a system with PCI-to-PCI bridges, following errors are observed: > > PCI: Failed to allocate mem resource #8:100000@...00000 for 0000:02:00.0 > PCI: Failed to allocate mem resource #6:10000@0 for 0000:03:01.0 > > '#6' is for expansion ROM and '#8' for the bridge where the device > with the expansion ROM is connected. I believe there is a good chance that may be another instance of the regression caused by my "Avoid creating P2P prefetch window for expansion ROMs" patch that was recently reported by Jan Beulich. http://marc.info/?l=linux-kernel&m=119555581103023&w=2 You might want to try reverting my changes to see if the problem disappears. I am working on a better fix for the problem that the patch was attempting to address but this is turning out to be much more difficult than I expected. If I don't have a solution very soon I plan to publish a revert patch. > But I think the failure is benign because the allocation is > not necessary for these resources. This is an interesting idea. Could you elaborate? As far as I can tell, the kernel always tries to allocate memory for expansion ROMs which it also exports to user level. I have assumed that some drivers or user level apps may need to access this space. Is this not true? If this is due to my change, sorry for the trouble. Thanks, Gary -- Gary Hade System x Enablement IBM Linux Technology Center 503-578-4503 IBM T/L: 775-4503 garyhade@...ibm.com http://www.ibm.com/linux/ltc -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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