Merge tag 'mm-hotfixes-stable-2026-05-25-16-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mmHEADmaster

Pull misc fixes from Andrew Morton:
 "13 hotfixes. 9 are for MM. 9 are cc:stable and the remaining 4 address
  post-7.1 issues or aren't considered suitable for backporting.

  All patches are singletons - please see the individual changelogs for
  details"

* tag 'mm-hotfixes-stable-2026-05-25-16-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
  Revert "mm: introduce a new page type for page pool in page type"
  mm/vmalloc: do not trigger BUG() on BH disabled context
  MAINTAINERS, mailmap: change email for Eugen Hristev
  mm/migrate_device: fix pgtable leak in migrate_vma_insert_huge_pmd_page
  kernel/fork: validate exit_signal in kernel_clone()
  mm: memcontrol: propagate NMI slab stats to memcg vmstats
  mm/damon/sysfs-schemes: delete tried region in regions_rmdirs()
  mm/rmap: initialize nr_pages to 1 at loop start in try_to_unmap_one
  zram: fix use-after-free in zram_writeback_endio
  memfd: deny writeable mappings when implying SEAL_WRITE
  ipc: limit next_id allocation to the valid ID range
  Revert "mm/hugetlbfs: update hugetlbfs to use mmap_prepare"
  MAINTAINERS: .mailmap: update after GEHC spin-off

4 files changed, 27 insertions, 28 deletions

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 93418625d3c5..5957bc25efa8 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -148,7 +148,7 @@ int hugetlb_mfill_atomic_pte(pte_t *dst_pte,
 			     struct folio **foliop);
 #endif /* CONFIG_USERFAULTFD */
 long hugetlb_reserve_pages(struct inode *inode, long from, long to,
-			   struct vm_area_desc *desc, vma_flags_t vma_flags);
+			   struct vm_area_struct *vma, vma_flags_t vma_flags);
 long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
 						long freed);
 bool folio_isolate_hugetlb(struct folio *folio, struct list_head *list);
@@ -276,7 +276,6 @@ long hugetlb_change_protection(struct vm_area_struct *vma,
 void hugetlb_unshare_all_pmds(struct vm_area_struct *vma);
 void fixup_hugetlb_reservations(struct vm_area_struct *vma);
 void hugetlb_split(struct vm_area_struct *vma, unsigned long addr);
-int hugetlb_vma_lock_alloc(struct vm_area_struct *vma);
 
 unsigned int arch_hugetlb_cma_order(void);
 
@@ -469,11 +468,6 @@ static inline void fixup_hugetlb_reservations(struct vm_area_struct *vma)
 
 static inline void hugetlb_split(struct vm_area_struct *vma, unsigned long addr) {}
 
-static inline int hugetlb_vma_lock_alloc(struct vm_area_struct *vma)
-{
-	return 0;
-}
-
 #endif /* !CONFIG_HUGETLB_PAGE */
 
 #ifndef pgd_write
diff --git a/include/linux/hugetlb_inline.h b/include/linux/hugetlb_inline.h
index 565b473fd135..5c29cd3223a1 100644
--- a/include/linux/hugetlb_inline.h
+++ b/include/linux/hugetlb_inline.h
@@ -6,23 +6,13 @@
 
 #ifdef CONFIG_HUGETLB_PAGE
 
-static inline bool is_vm_hugetlb_flags(vm_flags_t vm_flags)
-{
-	return !!(vm_flags & VM_HUGETLB);
-}
-
 static inline bool is_vma_hugetlb_flags(const vma_flags_t *flags)
 {
-	return vma_flags_test_any(flags, VMA_HUGETLB_BIT);
+	return vma_flags_test(flags, VMA_HUGETLB_BIT);
 }
 
 #else
 
-static inline bool is_vm_hugetlb_flags(vm_flags_t vm_flags)
-{
-	return false;
-}
-
 static inline bool is_vma_hugetlb_flags(const vma_flags_t *flags)
 {
 	return false;
@@ -32,7 +22,7 @@ static inline bool is_vma_hugetlb_flags(const vma_flags_t *flags)
 
 static inline bool is_vm_hugetlb_page(const struct vm_area_struct *vma)
 {
-	return is_vm_hugetlb_flags(vma->vm_flags);
+	return is_vma_hugetlb_flags(&vma->flags);
 }
 
 #endif
diff --git a/include/linux/mm.h b/include/linux/mm.h
index af23453e9dbd..06bbe9eba636 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -5174,9 +5174,10 @@ int arch_lock_shadow_stack_status(struct task_struct *t, unsigned long status);
  * DMA mapping IDs for page_pool
  *
  * When DMA-mapping a page, page_pool allocates an ID (from an xarray) and
- * stashes it in the upper bits of page->pp_magic. Non-PP pages can have
- * arbitrary kernel pointers stored in the same field as pp_magic (since
- * it overlaps with page->lru.next), so we must ensure that we cannot
+ * stashes it in the upper bits of page->pp_magic. We always want to be able to
+ * unambiguously identify page pool pages (using page_pool_page_is_pp()). Non-PP
+ * pages can have arbitrary kernel pointers stored in the same field as pp_magic
+ * (since it overlaps with page->lru.next), so we must ensure that we cannot
  * mistake a valid kernel pointer with any of the values we write into this
  * field.
  *
@@ -5211,6 +5212,26 @@ int arch_lock_shadow_stack_status(struct task_struct *t, unsigned long status);
 #define PP_DMA_INDEX_MASK GENMASK(PP_DMA_INDEX_BITS + PP_DMA_INDEX_SHIFT - 1, \
 				  PP_DMA_INDEX_SHIFT)
 
+/* Mask used for checking in page_pool_page_is_pp() below. page->pp_magic is
+ * OR'ed with PP_SIGNATURE after the allocation in order to preserve bit 0 for
+ * the head page of compound page and bit 1 for pfmemalloc page, as well as the
+ * bits used for the DMA index. page_is_pfmemalloc() is checked in
+ * __page_pool_put_page() to avoid recycling the pfmemalloc page.
+ */
+#define PP_MAGIC_MASK ~(PP_DMA_INDEX_MASK | 0x3UL)
+
+#ifdef CONFIG_PAGE_POOL
+static inline bool page_pool_page_is_pp(const struct page *page)
+{
+	return (page->pp_magic & PP_MAGIC_MASK) == PP_SIGNATURE;
+}
+#else
+static inline bool page_pool_page_is_pp(const struct page *page)
+{
+	return false;
+}
+#endif
+
 #define PAGE_SNAPSHOT_FAITHFUL (1 << 0)
 #define PAGE_SNAPSHOT_PG_BUDDY (1 << 1)
 #define PAGE_SNAPSHOT_PG_IDLE  (1 << 2)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 0e03d816e8b9..7223f6f4e2b4 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -923,7 +923,6 @@ enum pagetype {
 	PGTY_zsmalloc		= 0xf6,
 	PGTY_unaccepted		= 0xf7,
 	PGTY_large_kmalloc	= 0xf8,
-	PGTY_netpp		= 0xf9,
 
 	PGTY_mapcount_underflow = 0xff
 };
@@ -1056,11 +1055,6 @@ PAGE_TYPE_OPS(Zsmalloc, zsmalloc, zsmalloc)
 PAGE_TYPE_OPS(Unaccepted, unaccepted, unaccepted)
 PAGE_TYPE_OPS(LargeKmalloc, large_kmalloc, large_kmalloc)
 
-/*
- * Marks page_pool allocated pages.
- */
-PAGE_TYPE_OPS(Netpp, netpp, netpp)
-
 /**
  * PageHuge - Determine if the page belongs to hugetlbfs
  * @page: The page to test.