[Lucid ec2] Fix kernel deadlock in spinlock

[Stefan Bader]

On 25.06.2012 11:55, Stefan Bader wrote:
> Xen allows for a certain level of nested spinlocks. However the code
> (SUSE patchset) that currently is in ec2 has a serious problems there.
> 
> I picked the new implementation from the more recent version of the
> patchset and backported it to lucid-ec2. Since the bug is not easy
> to reproduce it took a while to get feedback. But it seems to be
> good enough according to a recent feedback.
> 
> NOTE: This requires an ABI bump!
> 
> -Stefan
> 
> 
Yes, I know the patch is quite ugly from the SRU point of view. That is the
reason I held off pushing that so long.


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