mm/huge_memory: remove unused can_split_folio()

Patch series "mm/huge_memory: drop dead split helper variants".

Two trivial cleanups in the folio split API, found while auditing the
split helpers for the inode UAF fix [1]:

 - can_split_folio() is dead: only the !THP stub remains, no definition
   under CONFIG_TRANSPARENT_HUGEPAGE and no callers. Leftover from an
   earlier cleanup.

 - split_folio_to_list_to_order() has no direct callers; its only user
   is split_folio_to_order(), which always passes a NULL list. Fold it.

No functional change.


This patch (of 2):

can_split_folio() has no callers and no definition under
CONFIG_TRANSPARENT_HUGEPAGE; only the !THP stub remains, left behind by an
earlier cleanup.  Remove it.

No functional change.

Link: https://lore.kernel.org/20260716100345.473473-1-kirill@shutemov.name
Link: https://lore.kernel.org/20260716100345.473473-2-kirill@shutemov.name
Link: https://lore.kernel.org/linux-mm/aldjhtfVByHDQXe6@thinkstation [1]
Link: https://lore.kernel.org/linux-mm/20260714122344.351895-1-kirill@shutemov.name [2]
Signed-off-by: Kiryl Shutsemau (Meta) <kas@kernel.org>
Acked-by: Usama Arif <usama.arif@linux.dev>
Reviewed-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Nico Pache <npache@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

0 files changed, 0 insertions, 0 deletions