Re: [PATCH] mm, hugetlb, soft_offline: save compound page order before page migration

[Andrew Morton]

On Tue, 12 Sep 2017 13:54:48 -0700 Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:

> On Tue, 12 Sep 2017 22:43:06 +0200 Alexandru Moise <00moses.alexander00@xxxxxxxxx> wrote:
> 
> > This fixes a bug in madvise() where if you'd try to soft offline a
> > hugepage via madvise(), while walking the address range you'd end up,
> > using the wrong page offset due to attempting to get the compound
> > order of a former but presently not compound page, due to dissolving
> > the huge page (since c3114a8).
> 
> What are the user visible effects of the bug?  The wrong page is
> offlined?  No offlining occurs?  

This also affects MADV_HWPOISON?