Re: [Xen-devel] [linux-linus test] 25478: regressions - FAIL [and 1 more messages]

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Apr 16, 2014 7:47 AM, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx> wrote:
>
> David Vrabel writes ("Re: [Xen-devel] [linux-linus test] 25478: regressions - 
> FAIL [and 1 more messages]"): 
> > On 16/04/14 11:12, Ian Jackson wrote: 
> > > Ian Jackson writes ("Re: [Xen-devel] [linux-linus test] 25478: 
> > > regressions - FAIL [and 1 more messages]"): 
> > >> Are we any closer to figuring out how to get a fix for this past the 
> > >> x86 maintainers ? 
> > >> 
> > >> Does the Linux kernel not have a "no regressions" policy ? This is a 
> > >> regression, after all... 
> > > 
> > > Another week has gone by and Linux tip still fails this test. 
> > 
> > Yes, You've not fixed it yet. 
>
> My understanding from private emails is that the problem is mostly 
> political rather than technical. 
>
> You wrote: 
> >> mptsas is a driver that uses dma_get_required_mask() to determine a 
> >> "suitable" DMA mask -- but under Xen dma_get_required_mask() may return 
> >> the wrong mask since it only gets the physical RAM range and not machine 
> >> addresses. 
>
> I'm not familiar with the Linux kernel's VM system. However, if 
> someone would write a patch which provides an arch override for this 
> (which from the private emails seems like is what required and would 
> not be too hard for someone who knew what they were doing), then I can 
> try to do the political work of negotiating with the Linux community. 
>

Sure. But before we go that route - can you try the suggestion given by David 
to see if does indeed 'fix' the issue.

> Ian. 
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