Merge tag 'mm-stable-2026-02-18-19-48' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull more MM  updates from Andrew Morton:

 - "mm/vmscan: fix demotion targets checks in reclaim/demotion" fixes a
   couple of issues in the demotion code - pages were failed demotion
   and were finding themselves demoted into disallowed nodes (Bing Jiao)

 - "Remove XA_ZERO from error recovery of dup_mmap()" fixes a rare
   mapledtree race and performs a number of cleanups (Liam Howlett)

 - "mm: add bitmap VMA flag helpers and convert all mmap_prepare to use
   them" implements a lot of cleanups following on from the conversion
   of the VMA flags into a bitmap (Lorenzo Stoakes)

 - "support batch checking of references and unmapping for large folios"
   implements batching to greatly improve the performance of reclaiming
   clean file-backed large folios (Baolin Wang)

 - "selftests/mm: add memory failure selftests" does as claimed (Miaohe
   Lin)

* tag 'mm-stable-2026-02-18-19-48' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (36 commits)
  mm/page_alloc: clear page->private in free_pages_prepare()
  selftests/mm: add memory failure dirty pagecache test
  selftests/mm: add memory failure clean pagecache test
  selftests/mm: add memory failure anonymous page test
  mm: rmap: support batched unmapping for file large folios
  arm64: mm: implement the architecture-specific clear_flush_young_ptes()
  arm64: mm: support batch clearing of the young flag for large folios
  arm64: mm: factor out the address and ptep alignment into a new helper
  mm: rmap: support batched checks of the references for large folios
  tools/testing/vma: add VMA userland tests for VMA flag functions
  tools/testing/vma: separate out vma_internal.h into logical headers
  tools/testing/vma: separate VMA userland tests into separate files
  mm: make vm_area_desc utilise vma_flags_t only
  mm: update all remaining mmap_prepare users to use vma_flags_t
  mm: update shmem_[kernel]_file_*() functions to use vma_flags_t
  mm: update secretmem to use VMA flags on mmap_prepare
  mm: update hugetlbfs to use VMA flags on mmap_prepare
  mm: add basic VMA flag operation helper functions
  tools: bitmap: add missing bitmap_[subset(), andnot()]
  mm: add mk_vma_flags() bitmap flag macro helper
  ...

1 files changed, 6 insertions, 6 deletions

diff --git a/ipc/shm.c b/ipc/shm.c
index 3db36773dd10..e8c7d1924c50 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -707,9 +707,10 @@ static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
 	int error;
 	struct shmid_kernel *shp;
 	size_t numpages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
+	const bool has_no_reserve = shmflg & SHM_NORESERVE;
+	vma_flags_t acctflag = EMPTY_VMA_FLAGS;
 	struct file *file;
 	char name[13];
-	vm_flags_t acctflag = 0;
 
 	if (size < SHMMIN || size > ns->shm_ctlmax)
 		return -EINVAL;
@@ -749,8 +750,8 @@ static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
 		hugesize = ALIGN(size, huge_page_size(hs));
 
 		/* hugetlb_file_setup applies strict accounting */
-		if (shmflg & SHM_NORESERVE)
-			acctflag = VM_NORESERVE;
+		if (has_no_reserve)
+			vma_flags_set(&acctflag, VMA_NORESERVE_BIT);
 		file = hugetlb_file_setup(name, hugesize, acctflag,
 				HUGETLB_SHMFS_INODE, (shmflg >> SHM_HUGE_SHIFT) & SHM_HUGE_MASK);
 	} else {
@@ -758,9 +759,8 @@ static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
 		 * Do not allow no accounting for OVERCOMMIT_NEVER, even
 		 * if it's asked for.
 		 */
-		if  ((shmflg & SHM_NORESERVE) &&
-				sysctl_overcommit_memory != OVERCOMMIT_NEVER)
-			acctflag = VM_NORESERVE;
+		if  (has_no_reserve && sysctl_overcommit_memory != OVERCOMMIT_NEVER)
+			vma_flags_set(&acctflag, VMA_NORESERVE_BIT);
 		file = shmem_kernel_file_setup(name, size, acctflag);
 	}
 	error = PTR_ERR(file);