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Date:	Thu, 6 Feb 2014 11:12:15 -0800
From:	Dan Williams <>
To:	Sander Eikelenboom <>
Cc:	Konrad Rzeszutek Wilk <>,
	Wei Liu <>,
	Francois Romieu <>,
	"" <>,
	"" <>
Subject: Re: 3.14-mw regression: rtl8169 WARNING: DMA-API: exceeded 7
 overlapping mappings of pfn 55ebe

On Thu, Feb 6, 2014 at 6:27 AM, Sander Eikelenboom <> wrote:
>>>> Not using it seems to prevent the warning, but before 3.14 i have never seen this (with r8169.use_dac=1)
>> If you are still hitting this with the patch:
>>   59f2e7df574c dma-debug: fix overlap detection
>> ...then I'm more inclined to think it is an actual positive report.
>> If you don't mind I'll send some debug patches to narrow this down.
> Please do .. sounds better than bisecting :-)

Hi, attached is a patch that should give some insight whether the
driver is triggering many overlapping mappings.  Try it on top of

Thank you for the debug help!

Download attachment "debug-overlap" of type "application/octet-stream" (1965 bytes)

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