Re: pci-usb/pci-sata broken with LPAE config after "reduce use of block bounce buffers"

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On Wed, Feb 05, 2020 at 10:45:24AM +0530, Kishon Vijay Abraham I wrote:
> > Ok, this mostly like means we allocate a swiotlb buffer that isn't
> > actually addressable.  To verify that can you post the output with the
> > first attached patch?  If it shows the overflow message added there,
> > please try if the second patch fixes it.
> 
> I'm seeing some sort of busy loop after applying your 1st patch. I sent
> a SysRq to see where it is stuck

And that shows up just with the patch?  Really strange as it doesn't
change any blockig points.  What also is strange is that I don't see
any of the warnings that should be there.  FYI, the slightly updated
version of the patch that went through my testing it here:

    git://git.infradead.org/users/hch/misc.git swiotlb-debug

Gitweb:

    http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/swiotlb-debug

this also includes what was the second patch in the previous mail.  Can
you try that branch?



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