Re: [PATCH] mm: Fix the pgtable leak

[Greg KH]

On Wed, Feb 13, 2019 at 08:29:00PM +0900, Minchan Kim wrote:
> [1] was backported to v4.9 stable tree but it introduces pgtable
> memory leak because with fault retrial, preallocated pagetable
> could be leaked in second iteration.
> To fix the problem, this patch backport [2].
> 
> [1] 5cf3e5ff95876, mm, memcg: fix reclaim deadlock with writeback

This is really commit 63f3655f9501 ("mm, memcg: fix reclaim deadlock
with writeback") which was in 4.9.152, 4.14.94, 4.19.16, and 4.20.3 as
well as 5.0-rc2.

> [2] b0b9b3df27d10, mm: stop leaking PageTables

This commit was in 4.10, so I am guessing that this really is just a
backport of that commit?

If so, it's not the full backport, why not take the whole thing?  Why
only cherry-pick one chunk of it?  Why do we not need the other parts?

thanks,

greg k-h