[PATCH v3 10/11] mm/memory_hotplug: Make unregister_memory_block_under_nodes() never fail

Michal Hocko mhocko at kernel.org
Mon Jul 1 20:27:56 AEST 2019

On Mon 01-07-19 11:36:44, Oscar Salvador wrote:
> On Mon, Jul 01, 2019 at 10:51:44AM +0200, Michal Hocko wrote:
> > Yeah, we do not allow to offline multi zone (node) ranges so the current
> > code seems to be over engineered.
> > 
> > Anyway, I am wondering why do we have to strictly check for already
> > removed nodes links. Is the sysfs code going to complain we we try to
> > remove again?
> No, sysfs will silently "fail" if the symlink has already been removed.
> At least that is what I saw last time I played with it.
> I guess the question is what if sysfs handling changes in the future
> and starts dropping warnings when trying to remove a symlink is not there.
> Maybe that is unlikely to happen?

And maybe we handle it then rather than have a static allocation that
everybody with hotremove configured has to pay for.
Michal Hocko

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