Re: [PATCH for 4.19-stable 00/25] mm/memory_hotplug: backport of pending stable fixes

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On Thu, Jan 16, 2020 at 09:59:44AM +0100, David Hildenbrand wrote:
> On 16.01.20 09:54, Greg Kroah-Hartman wrote:
> > On Thu, Jan 16, 2020 at 09:42:51AM +0100, David Hildenbrand wrote:
> >> On 16.01.20 09:34, Greg Kroah-Hartman wrote:
> >>> On Wed, Jan 15, 2020 at 04:54:59PM +0100, David Hildenbrand wrote:
> >>>>>
> >>>>> And why would 4.9 and 4.4 care about them?
> >>>>
> >>>> The crashes can be trigger under 4.9 and 4.4. If we decide that we do
> >>>> not care, then this series can be dropped.
> >>>
> >>> Do we have users of memory hotplug that are somehow stuck at those old
> >>> versions that can not upgrade?  Obviously this didn't work previously
> >>> for them, so moving to a modern kernel might be a good reason to get
> >>> this new feature :)
> >>
> >> That's a good point - but usually when you experience a crash it's too
> >> late for you to realize that you have to move to a newer release :) It
> >> used to work before 4.4 IIRC.
> >>
> >> (one case I am concerned with is when memory onlining after memory
> >> hotplug failed (e.g., because the was an OOM event happening
> >> concurrently) - then memory hotunplug will crash your system.)
> >>
> >> But yeah, I am not aware of a report where somebody actually hit any of
> >> these issues on a stable kernel.
> 
> Just to clarify: I can reproduce them of course :)
> 
> > 
> > Ok, let's start with 4.19 and 4.14 for these for now.  Should make
> > things easier, right?
> 
> What do you mean with "start with"? Drop this series and not do the
> backport, meaning people should switch to a stable kernel > 4.19 if they
> don't want surprises on memory unplug?

No, I'm saying I want to take this for 4.19, and 4.14 if you have it.

But your original series you sent needs to be fixed up, I can't take it
as-is for the authorship reasons.

thanks,

greg k-h



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