Re: [Bug 15836] Commit 6ad696d2cf535772dff659298ec7e7260e344595 breaks my SD card reader [197b:2381]

[Andi Kleen <andi@firstfloor.org>]

On Mon, May 03, 2010 at 08:47:21PM +0200, Stephan Sürken wrote:
> On Sun, 2010-05-02 at 01:04 +0200, Andi Kleen wrote:
> (..) 
> > > config-2.6.33.2.git19f00f0-config-2.6.33-2-amd64.nohiber:CONFIG_MEMORY_HOTPLUG=y
> > > =>"bad"
> > > config-2.6.33.2.git19f00f0-config-2.6.33-2-amd64.nohotplug:# CONFIG_MEMORY_HOTPLUG is not set
> > > =>"good"
> (..)
> > Can send the diff of two boot logs with memory hotplug on and off?
> > I wonder if you have the same memory layout in both cases.
> 
> Attached, from the above two good/bad kernel builds; I stripped the
> stamps to make it more readable.

Thanks,

I was hoping for a comparison between memory hotplug on and off with
hibernation always off, this seems to be between memory hotplug and 
hibernation. 

Anyways looking at this log. The only significant difference I can
see is that in the one case a lot of stuff including sdhci 
get initialized earlier. Presumably the timing is somewhat 
different related to the USB scanning and the memory hotadd
kernel being a bit slower to boot (perhaps due to the increased printks)

Perhaps this exposes some races that cause the problem.
What these races are I don't know.

I would suggest to check with the mmc maintainer.

-Andi