Re: Regression in kernel 4.2.3+ (relative to 4.1.10) on AMD 990FX system with IOMMU enabled

[Joerg Roedel <jroedel-l3A5Bk7waGM@public.gmane.org>]

Hello Laine,

On Thu, Nov 12, 2015 at 12:33:53PM -0500, Laine Stump wrote:
> After a crash course in kernel building from Alex, I bisected down
> to commit aafd8ba - a kernel built without this commit succeeds in
> setting up all the devices mentioned, adding it causes failure (and
> a very long delay during boot). Joerg, do you have any ideas for
> debugging the problem further to see what in the commit causes this
> problem? (note that 2 other people with the same chipset but
> slightly different hardware plugged into it report no failure - see
> the other replies to the parent of this message for more detail).
> I'm happy to build a kernel with any suggested patches and report
> results...
> 
> commit aafd8ba0ca74894b9397e412bbd7f8ea2662ead8
> Author: Joerg Roedel <jroedel-l3A5Bk7waGM@public.gmane.org>
> Date:   Thu May 28 18:41:39 2015 +0200
> 
>     iommu/amd: Implement add_device and remove_device
> 
>     Implement these two iommu-ops call-backs to make use of the
>     initialization and notifier features of the iommu core.
> 
>     Signed-off-by: Joerg Roedel <jroedel-l3A5Bk7waGM@public.gmane.org>

I have no idea yet how this patch causes your regression. You certainly
already posted it, but since I was not on Cc, can you please give me an
overview about the problem you are seeing with this patch?



	Joerg