Re: [PATCH] mm, page_alloc: do not break __GFP_THISNODE by zonelist reset

[Andrew Morton]

On Fri, 25 May 2018 15:08:53 +0200 Vlastimil Babka <vbabka@xxxxxxx> wrote:

> we might consider this for 4.17 although I don't know if there's anything
> currently broken. Stable backports should be more important, but will have to
> be reviewed carefully, as the code went through many changes.
> BTW I think that also the ac->preferred_zoneref reset is currently useless if
> we don't also reset ac->nodemask from a mempolicy to NULL first (which we
> probably should for the OOM victims etc?), but I would leave that for a
> separate patch.

Confused.  If nothing is currently broken then why is a backport
needed?  Presumably because we expect breakage in the future?  Can you
expand on this?