Re: [PATCH v1 0/4] mm: move vma_(kernel|mmu)_pagesize() out of hugetlb.c

["Lorenzo Stoakes (Oracle)" <ljs@kernel.org>]

On Fri, Mar 06, 2026 at 11:13:41AM +0000, Pedro Falcato wrote:
> On Fri, Mar 06, 2026 at 11:15:56AM +0100, David Hildenbrand (Arm) wrote:
> > Looking into vma_(kernel|mmu)_pagesize(), I realized that there is one
> > scenario where DAX would not do the right thing when the kernel is
> > not compiled with hugetlb support.
> >
> > Without hugetlb support, vma_(kernel|mmu)_pagesize() will always return
> > PAGE_SIZE instead of using the ->pagesize() result provided by dax-device
> > code.
> >
> > Fix that by moving vma_kernel_pagesize() to core MM code, where it belongs.
> > I don't think this is stable material, but am not 100% sure.
> >
> > Also, move vma_mmu_pagesize() while at it. Remove the unnecessary hugetlb.h
> > inclusion from KVM code.
> >
> > Cross-compiled heavily.
> >
> > Cc: Andrew Morton <akpm@linux-foundation.org>
> > Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
> > Cc: Nicholas Piggin <npiggin@gmail.com>
> > Cc: Michael Ellerman <mpe@ellerman.id.au>
> > Cc: "Christophe Leroy (CS GROUP)" <chleroy@kernel.org>
> > Cc: Muchun Song <muchun.song@linux.dev>
> > Cc: Oscar Salvador <osalvador@suse.de>
> > Cc: Lorenzo Stoakes <ljs@kernel.org>
> > Cc: "Liam R. Howlett" <Liam.Howlett@oracle.com>
> > Cc: Vlastimil Babka <vbabka@kernel.org>
> > Cc: Mike Rapoport <rppt@kernel.org>
> > Cc: Suren Baghdasaryan <surenb@google.com>
> > Cc: Michal Hocko <mhocko@suse.com>
> > Cc: Jann Horn <jannh@google.com>
> > Cc: Pedro Falcato <pfalcato@suse.de>
> > Cc: Paolo Bonzini <pbonzini@redhat.com>
> > Cc: Dan Williams <dan.j.williams@intel.com>
>
> Although we all love less mail, FYI it seems like this didn't work properly
> for the patches (no CC's on there).
>
> Did you try git-email --cc-cover?

Yeah I noticed this also :>) Assumed it was a new way of doing things somehow?
:P

>
> --
> Pedro

Cheers, Lorenzo