Re: [PATCH v2 09/13] mm: update all remaining mmap_prepare users to use vma_flags_t

Darrick J. Wong
2026-01-23T07:47:49Z

On Thu, Jan 22, 2026 at 04:06:18PM +0000, Lorenzo Stoakes wrote:
> We will be shortly removing the vm_flags_t field from vm_area_desc so we
> need to update all mmap_prepare users to only use the dessc->vma_flags
> field.
>
> This patch achieves that and makes all ancillary changes required to make
> this possible.
>
> This lays the groundwork for future work to eliminate the use of vm_flags_t
> in vm_area_desc altogether and more broadly throughout the kernel.
>
> While we're here, we take the opportunity to replace VM_REMAP_FLAGS with
> VMA_REMAP_FLAGS, the vma_flags_t equivalent.
>
> No functional changes intended.
>
> Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
> ---
> drivers/char/mem.c | 6 +++---
> drivers/dax/device.c | 10 +++++-----
> fs/aio.c | 2 +-
> fs/erofs/data.c | 5 +++--
> fs/ext4/file.c | 4 ++--
> fs/ntfs3/file.c | 2 +-
> fs/orangefs/file.c | 4 ++--
> fs/ramfs/file-nommu.c | 2 +-
> fs/resctrl/pseudo_lock.c | 2 +-
> fs/romfs/mmap-nommu.c | 2 +-
> fs/xfs/xfs_file.c | 4 ++--
> fs/zonefs/file.c | 3 ++-
> include/linux/dax.h | 8 ++++----
> include/linux/mm.h | 24 +++++++++++++++++++-----
> kernel/relay.c | 2 +-
> mm/memory.c | 17 ++++++++---------
> 16 files changed, 56 insertions(+), 41 deletions(-)
>

<snip to xfs>

> diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
> index 7874cf745af3..1238ec018bc7 100644
> --- a/fs/xfs/xfs_file.c
> +++ b/fs/xfs/xfs_file.c
> @@ -1974,14 +1974,14 @@ xfs_file_mmap_prepare(
> * We don't support synchronous mappings for non-DAX files and
> * for DAX files if underneath dax_device is not synchronous.
> */
> - if (!daxdev_mapping_supported(desc->vm_flags, file_inode(file),
> + if (!daxdev_mapping_supported(desc, file_inode(file),
> target->bt_daxdev))
> return -EOPNOTSUPP;
>
> file_accessed(file);
> desc->vm_ops = &xfs_file_vm_ops;
> if (IS_DAX(inode))
> - desc->vm_flags |= VM_HUGEPAGE;
> + vma_desc_set_flags(desc, VMA_HUGEPAGE_BIT);

Looks good to me,
Acked-by: "Darrick J. Wong" <djwong@kernel.org>

--D

> return 0;
> }
>