On Tue, Sep 12, 2017 at 01:58:35PM -0700, Andrew Morton wrote: > On Tue, 12 Sep 2017 13:54:48 -0700 Andrew Morton <a...@linux-foundation.org> > wrote: > > > On Tue, 12 Sep 2017 22:43:06 +0200 Alexandru Moise > > <00moses.alexande...@gmail.com> 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?
No, MADV_HWPOISON is ok because it doesn't dissolve the hugepage, so the page remains a compound page the 2nd loop around. ../Alex
