Re: [PATCH v3 1/5] mm/rmap: convert page -> folio for hwpoison checks

[Andrew Morton]

On Sat, 25 Jul 2026 13:06:25 +0530 Dev Jain <dev.jain@xxxxxxx> wrote:

> >> @@ -2204,7 +2205,11 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
> >>  		/* Update high watermark before we lower rss */
> >>  		update_hiwater_rss(mm);
> >>
> >> -		if (PageHWPoison(subpage) && (flags & TTU_HWPOISON)) {
> >> +		/*
> >> +		 * With TTU_HWPOISON, we only expect small folios or hugetlb
> >> +		 * folios here for now.
> >> +		 */
> >> +		if (folio_test_hwpoison(folio) && (flags & TTU_HWPOISON)) {
> > 
> > As per v2 discussion, I feel this could be tightened up, maybe something like:
> > 
> > 		/* unmap_poisoned_folio() only refs order-0 or hugetlb folios */
> > 
> 
> I can do this. But note that this series is in mm-unstable already - what should
> I base the v4 on?

Ordinarily basing on latest Linus works.  But this patchset has ~450
patches ahead of it and a quick trial merge wasn't promising.

I could drop the v3 series so you can base on next mm-new, please lmk.

Or

mm> git log --oneline | grep "mm/rmap: convert page -> folio for hwpoison checks"
bb2f8a7eb126 mm/rmap: convert page -> folio for hwpoison checks
mm> git checkout bb2f8a7eb126^