Re: preparations for 4.13.1 and 4.12.3

[Jan Beulich <jbeulich@xxxxxxxx>]

On 14.04.2020 15:07, Andrew Cooper wrote:
> On 09/04/2020 08:41, Jan Beulich wrote:
>> All,
>>
>> the releases are due in a week or two. Please point out backports
>> you find missing from the respective staging branches, but which
>> you consider relevant. (Ian, I notice there haven't been any
>> tools side backports at all so far. Julien, Stefano - same for
>> Arm.)
> 
> 540d4d60378c "cpu: sync any remaining RCU callbacks before CPU up/down"
> which fixes crashes after vcpu hotplug in shim.
> 
> It looks to depend on 53ddfc80a84a, a9b6dacf88fe, c301211a5111 and
> 53594c7bd197 which are other RCU bugfixes.

And cef21210fb133 as well as a6fe79a5979a then. Iirc we had even
talked about this on irc, and were largely in agreement that this
is a little beyond what we'd normally backport.

I have to admit that while I followed Igor's advice that there is
a dependency of his patch on Jürgen's work, I'm still not really
clear where that dependency actually lies. The patch merely moves
where rcu_barrier() gets invoked from (thus covering previously
uncovered places). If there hadn't been that named dependency, I
would have taken Igor's patch already.

Jan