Re: [PATCH v3 0/6] Fix incorrect access of hugetlb pte entries

[Will Deacon <will@kernel.org>]

On Tue, Jul 21, 2026 at 01:36:36PM -0700, Andrew Morton wrote:
> On Tue, 21 Jul 2026 18:18:38 +0100 Will Deacon <will@kernel.org> wrote:
> 
> > On Fri, 03 Jul 2026 11:41:53 +0000, Dev Jain wrote:
> > > There are various places which use ptep_get() to get the pte entry
> > > corresponding to a hugetlb folio. Some arches (like s390) have special
> > > handling to compute the pteval, so they provide huge_ptep_get(). Use this
> > > helper consistently.
> > > 
> > > Additionally, some code paths may provide huge_ptep_get with an unaligned
> > > address. This is a problem on arm64 (I checked other arches and it looks
> > > fine for them), which is fixed in patch 1. The fix is made to be
> > > to huge_ptep_get() - that is wider churn and we can do that later.
> > > 
> > > [...]
> > 
> > Applied first patch to arm64 (for-next/fixes), thanks!
> > 
> > [1/6] arm64: make huge_ptep_get handled unaligned addresses
> >       https://git.kernel.org/arm64/c/9175a8c7cfe88
> > 
> > I'm hoping Andrew can drop this from the mm tree to avoid a duplicate,
> > but I didn't hear back yet and I'd like to land the fix.
> 
> I can redo Dev's series to omit [1/6].  The patches apply that way, but
> there might be build-time or runtime issues running the other patches
> without [1/6] present, haven't looked.
> 
> Also, review indicates that the changelog requires updating
> (https://lore.kernel.org/all/2b9d60a2-8698-46b0-80ae-b8747a66a85b@kernel.org/)
> and I believe that Dev plans to do that.

There's been no update for two weeks, so I wouldn't hold your breath!

> IOW, it would be better to carry this in mm.git with your ack.
> 
> Do you plan to upstream this in 7.2-rcX?  If so then I can hang onto
> this patch until it appears in mainline.  Or something.

Yes, I'd like to get this (just this first patch!) in for -rc5 so I
picked it into the arm64 fixes branch.

Will