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Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: a2fe8e59-707d-4d2b-ec29-08de6a51212e X-MS-Exchange-CrossTenant-AuthSource: DS7PR12MB9473.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Feb 2026 16:09:41.6582 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: oI8yq5A8V2ZRRsWcFfth0gCXm9X0O32rti9+tfBQ+eHLr0sWSLHVg6wHta7hwsy4 X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB5594 X-Rspamd-Server: rspam11 X-Stat-Signature: pkdfpxstmhb6uxjjug4esuj8gcdxyt7z X-Rspam-User: X-Rspamd-Queue-Id: D11534000F X-HE-Tag: 1770912589-650607 X-HE-Meta: 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 jIphZBjl HiOvHm7/i2DzJfp8qdFvN37H77lWljU4m6lfw1/LWCEPD0Fx9fGVj4CPKDz59fuuN9QAVqmaseqf2nwJ0O3yDsqMRP79GtAybX3PClxzR461oL2l7b1qdzIHduA+9UDd721UUwhknIfKQ0nCL+7rcNEwLKix0Z43ZGLb/WWxqTUdXN1TIl4uaLr/n7TrSeu+I4wrxRE8pIH38vRbFlwmXSrD2qaHxYBcClen2RLsV54uBvyS12CgpZv/TT6/7358IGiQfplU+aio5UxAm/Om57a4Ju6J10bCaGBeoEqKrOh5EOa996jy24BLUcf9JTAg0FNRkKUCBXTpxEJLsJjkCpAfJqIjIEYwXY42PI0dSfcD9Vw3Crpz/PbtcobiJ/YCi0lweNJukcfvQb15Og9CoZQ4P7T45dFXxhCj7bYI6F63q4NeUgRCiNGT7hw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 11 Feb 2026, at 21:18, Nico Pache wrote: > The anonymous page fault handler in do_anonymous_page() open-codes the > sequence to map a newly allocated anonymous folio at the PTE level: > - construct the PTE entry > - add rmap > - add to LRU > - set the PTEs > - update the MMU cache. > > Introduce a two helpers to consolidate this duplicated logic, mirroring t= he > existing map_anon_folio_pmd_nopf() pattern for PMD-level mappings: > > map_anon_folio_pte_nopf(): constructs the PTE entry, takes folio > references, adds anon rmap and LRU. This function also handles the > uffd_wp that can occur in the pf variant. > > map_anon_folio_pte_pf(): extends the nopf variant to handle MM_ANONPAGES > counter updates, and mTHP fault allocation statistics for the page fault > path. > > The zero-page read path in do_anonymous_page() is also untangled from the > shared setpte label, since it does not allocate a folio and should not > share the same mapping sequence as the write path. Make nr_pages =3D 1 > rather than relying on the variable. This makes it more clear that we > are operating on the zero page only. > > This refactoring will also help reduce code duplication between mm/memory= .c > and mm/khugepaged.c, and provides a clean API for PTE-level anonymous fol= io > mapping that can be reused by future callers. > > Signed-off-by: Nico Pache > --- > include/linux/mm.h | 4 ++++ > mm/memory.c | 56 ++++++++++++++++++++++++++++++---------------- > 2 files changed, 41 insertions(+), 19 deletions(-) > > diff --git a/include/linux/mm.h b/include/linux/mm.h > index f8a8fd47399c..c3aa1f51e020 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -4916,4 +4916,8 @@ static inline bool snapshot_page_is_faithful(const = struct page_snapshot *ps) > > void snapshot_page(struct page_snapshot *ps, const struct page *page); > > +void map_anon_folio_pte_nopf(struct folio *folio, pte_t *pte, > + struct vm_area_struct *vma, unsigned long addr, > + bool uffd_wp); > + > #endif /* _LINUX_MM_H */ > diff --git a/mm/memory.c b/mm/memory.c > index 8c19af97f0a0..61c2277c9d9f 100644 > --- a/mm/memory.c > +++ b/mm/memory.c > @@ -5211,6 +5211,35 @@ static struct folio *alloc_anon_folio(struct vm_fa= ult *vmf) > return folio_prealloc(vma->vm_mm, vma, vmf->address, true); > } > > + > +void map_anon_folio_pte_nopf(struct folio *folio, pte_t *pte, > + struct vm_area_struct *vma, unsigned long addr, > + bool uffd_wp) > +{ > + pte_t entry =3D folio_mk_pte(folio, vma->vm_page_prot); > + unsigned int nr_pages =3D folio_nr_pages(folio); > + > + entry =3D maybe_mkwrite(pte_mkdirty(entry), vma); > + if (uffd_wp) > + entry =3D pte_mkuffd_wp(entry); > + > + folio_ref_add(folio, nr_pages - 1); > + folio_add_new_anon_rmap(folio, vma, addr, RMAP_EXCLUSIVE); > + folio_add_lru_vma(folio, vma); > + set_ptes(vma->vm_mm, addr, pte, entry, nr_pages); > + update_mmu_cache_range(NULL, vma, addr, pte, nr_pages); Copy the comment /* No need to invalidate - it was non-present before */ above it please. > +} > + > +static void map_anon_folio_pte_pf(struct folio *folio, pte_t *pte, > + struct vm_area_struct *vma, unsigned long addr, > + unsigned int nr_pages, bool uffd_wp) > +{ > + map_anon_folio_pte_nopf(folio, pte, vma, addr, uffd_wp); > + add_mm_counter(vma->vm_mm, MM_ANONPAGES, nr_pages); > + count_mthp_stat(folio_order(folio), MTHP_STAT_ANON_FAULT_ALLOC); > +} > + > + > /* > * We enter with non-exclusive mmap_lock (to exclude vma changes, > * but allow concurrent faults), and pte mapped but not yet locked. > @@ -5257,7 +5286,13 @@ static vm_fault_t do_anonymous_page(struct vm_faul= t *vmf) > pte_unmap_unlock(vmf->pte, vmf->ptl); > return handle_userfault(vmf, VM_UFFD_MISSING); > } > - goto setpte; > + if (vmf_orig_pte_uffd_wp(vmf)) > + entry =3D pte_mkuffd_wp(entry); > + set_pte_at(vma->vm_mm, addr, vmf->pte, entry); entry is only used in this if statement, you can move its declaration insid= e. > + > + /* No need to invalidate - it was non-present before */ > + update_mmu_cache_range(vmf, vma, addr, vmf->pte, /*nr_pages=3D*/ 1); > + goto unlock; > } > > /* Allocate our own private page. */ > @@ -5281,11 +5316,6 @@ static vm_fault_t do_anonymous_page(struct vm_faul= t *vmf) > */ > __folio_mark_uptodate(folio); > > - entry =3D folio_mk_pte(folio, vma->vm_page_prot); > - entry =3D pte_sw_mkyoung(entry); It is removed, can you explain why? > - if (vma->vm_flags & VM_WRITE) > - entry =3D pte_mkwrite(pte_mkdirty(entry), vma); OK, this becomes maybe_mkwrite(pte_mkdirty(entry), vma). > - The above code is moved into map_anon_folio_pte_nopf(), thus executed later than before the change. folio, vma->vm_flags, and vma->vm_page_prot are not changed between, so there should be no functional change. But it is better to explain it in the commit message to make review easier. > vmf->pte =3D pte_offset_map_lock(vma->vm_mm, vmf->pmd, addr, &vmf->ptl)= ; > if (!vmf->pte) > goto release; > @@ -5307,19 +5337,7 @@ static vm_fault_t do_anonymous_page(struct vm_faul= t *vmf) > folio_put(folio); > return handle_userfault(vmf, VM_UFFD_MISSING); > } > - > - folio_ref_add(folio, nr_pages - 1); > - add_mm_counter(vma->vm_mm, MM_ANONPAGES, nr_pages); > - count_mthp_stat(folio_order(folio), MTHP_STAT_ANON_FAULT_ALLOC); These counter updates are moved after folio_add_new_anon_rmap(), mirroring map_anon_folio_pmd_pf()=E2=80=99s order. Looks good to me. > - folio_add_new_anon_rmap(folio, vma, addr, RMAP_EXCLUSIVE); > - folio_add_lru_vma(folio, vma); > -setpte: > - if (vmf_orig_pte_uffd_wp(vmf)) > - entry =3D pte_mkuffd_wp(entry); This is moved above folio_ref_add() in map_anon_folio_pte_nopf(), but no functional change is expected. > - set_ptes(vma->vm_mm, addr, vmf->pte, entry, nr_pages); > - > - /* No need to invalidate - it was non-present before */ > - update_mmu_cache_range(vmf, vma, addr, vmf->pte, nr_pages); > + map_anon_folio_pte_pf(folio, vmf->pte, vma, addr, nr_pages, vmf_orig_pt= e_uffd_wp(vmf)); > unlock: > if (vmf->pte) > pte_unmap_unlock(vmf->pte, vmf->ptl); > --=20 > 2.53.0 3 things: 1. Copy the comment for update_mmu_cache_range() in map_anon_folio_pte_nopf= (). 2. Make pte_t entry local in zero-page handling. 3. Explain why entry =3D pte_sw_mkyoung(entry) is removed. Thanks. Best Regards, Yan, Zi