Unmapped was added as a parameter to __folio_split() and related call
sites to support splitting of folios already in the midst of a migration.
This special case arose for device private folio migration since during
migration there could be a disconnect between source and destination on
the folio size.
Introduce folio_split_unmapped() to handle this special case. Also
refactor code and add __folio_freeze_and_split_unmapped() helper that is
common to both __folio_split() and folio_split_unmapped().
This in turn removes the special casing introduced by the unmapped
parameter in __folio_split().
[balbirs@nvidia.com: v2]
Link: https://lkml.kernel.org/r/20251115084041.3914728-1-balbirs@nvidia.com
[balbirs@nvidia.com: fix clang-20 build]
Link: https://lkml.kernel.org/r/20251120134232.3588203-1-balbirs@nvidia.com
[akpm@linux-foundation.org: add `inline' to shmem_uncharge() stub, per Balbir]
Link: https://lkml.kernel.org/r/20251114012228.2634882-1-balbirs@nvidia.com
Signed-off-by: Balbir Singh <balbirs@nvidia.com>
Suggested-by: Zi Yan <ziy@nvidia.com>
Acked-by: Zi Yan <ziy@nvidia.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Joshua Hahn <joshua.hahnjy@gmail.com>
Cc: Rakie Kim <rakie.kim@sk.com>
Cc: Byungchul Park <byungchul@sk.com>
Cc: Gregory Price <gourry@gourry.net>
Cc: Ying Huang <ying.huang@linux.alibaba.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: "Liam R. Howlett" <Liam.Howlett@oracle.com>
Cc: Nico Pache <npache@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Lyude Paul <lyude@redhat.com>
Cc: Danilo Krummrich <dakr@kernel.org>
Cc: David Airlie <airlied@gmail.com>
Cc: Simona Vetter <simona@ffwll.ch>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Mika Penttilä <mpenttil@redhat.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Francois Dugast <francois.dugast@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
cab812d9c9