mm/huge_memory: split the routine for splitting anon and file folio

No functional change intended.  Before adding more logic, split
__folio_freeze_and_split_unmapped() into an anon and a file variant so
each path can evolve independently.  The two paths shared little beyond
the folio freeze call, the LRU locking, and the unfreeze skeleton, but
differed in all other per-folio bookkeeping and routines.

While splitting, some cleanups become easy to apply, and helped drop a few
now-redundant checks.

The zone_device_private_split_cb() calls are only kept in the anon
variant, as device private folios can only back anonymous memory, and add
a VM_WARN_ON_ONCE_FOLIO() at the entry of the file variant.

Link: https://lore.kernel.org/20260923-swap-thp-cleanup-v6-4-ba1b4ba72c6f@tencent.com
Signed-off-by: Kairui Song <kasong@tencent.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: Kiryl Shutsemau (Meta) <kas@kernel.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Nico Pache <nico.pache@linux.dev>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Usama Arif <usama.arif@linux.dev>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Chris Li <chrisl@kernel.org>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Baoquan He <baoquan.he@linux.dev>
Cc: Barry Song <baohua@kernel.org>
Cc: Youngjun Park <youngjun.park@lge.com>
Cc: Shivam Kalra <shivamkalra98@zohomail.in>
Cc: Kairui Song <ryncsn@gmail.com>

0 files changed, 0 insertions, 0 deletions