21 Nov
2017
21 Nov
'17
10:12 p.m.
On Mon, 20 Nov 2017 21:18:55 -0500 Zi Yan zi.yan@sent.com wrote:
In [1], Andrea reported that during memory hotplug/hot remove prep_transhuge_page() is called incorrectly on non-THP pages for migration, when THP is on but THP migration is not enabled. This leads to a bad state of target pages for migration.
This patch fixes it by only calling prep_transhuge_page() when we are certain that the target page is THP.
What are the user-visible effects of the bug?