Re: [PATCH] Revert "mm: introduce a new page type for page pool in page type"

[Byungchul Park]

On Mon, May 18, 2026 at 05:31:19PM -0700, Andrew Morton wrote:
> On Mon, 18 May 2026 12:00:11 +0100 Lorenzo Stoakes <ljs@xxxxxxxxxx> wrote:
> 
> > Maybe worth putting [PATCH mm-hotfixes] just to make it clear this should be an
> > urgent hotfix?
> >
> > On Fri, May 15, 2026 at 12:47:01PM +0900, Byungchul Park wrote:
> > > This reverts commit db359fccf212e7fa3136e6edbed6228475646fd7.
> >
> > Maybe 'this reverts commit db359fccf212 ("...") and partially reverts commit
> > 735a309b4bfb9e ("...") <details>'?
> >
> > >
> > > Netpp page_type'ed pages might be used in mapping so as to use
> > > @_mapcount.  However, since @page_type and @_mapcount are union'ed in
> > > struct page, these two can't be used at the same time.  Revert the
> > > commit introducing page_type for Netpp for now.
> >
> > Yikes!
> >
> > >
> > > The patch will be retried once @page_type and @_mapcount get allowed to
> > > be used at the same time.
> > >
> > > The revert also includes removal of @page_type initialization part
> > > introduced by commit 735a309b4bfb9e ("net: add net_iov_init() and use it
> > > to initialize ->page_type"), which will be restored on the retry.
> >
> > As above maybe mentioning at top of commit msg, as right now this reads as a
> > pure revert of db359fccf212.
> 
> I did

Oh great!  Thanks.

	Byungchul

> : This reverts commit db359fccf212 ("mm: introduce a new page type for page
> : pool in page type") and a part of 735a309b4bfb9e ("net: add net_iov_init()
> : and use it > to initialize ->page_type").
> 
> > >
> > > Reported-by: Dragos Tatulea <dtatulea@xxxxxxxxxx>
> > > Closes: https://lore.kernel.org/all/982b9bc1-0a0a-4fc5-8e3a-3672db2b29a1@xxxxxxxxxx
> >
> > Fixes tag?
> 
> I assume db359fccf212 ("mm: introduce a new page type for page pool in
> page type") is close enough.  Both that and 735a309b4bfb9e are new in
> 7.1-rcX.