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 09:42:51AM +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.

Ok, let's start with 4.19 and 4.14 for these for now.  Should make
things easier, right?

thanks,

greg k-h



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