On 13 Nov 2025, at 20:22, Balbir Singh wrote: > 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(). > > Cc: Andrew Morton <[email protected]> > Cc: David Hildenbrand <[email protected]> > Cc: Zi Yan <[email protected]> > Cc: Joshua Hahn <[email protected]> > Cc: Rakie Kim <[email protected]> > Cc: Byungchul Park <[email protected]> > Cc: Gregory Price <[email protected]> > Cc: Ying Huang <[email protected]> > Cc: Alistair Popple <[email protected]> > Cc: Oscar Salvador <[email protected]> > Cc: Lorenzo Stoakes <[email protected]> > Cc: Baolin Wang <[email protected]> > Cc: "Liam R. Howlett" <[email protected]> > Cc: Nico Pache <[email protected]> > Cc: Ryan Roberts <[email protected]> > Cc: Dev Jain <[email protected]> > Cc: Barry Song <[email protected]> > Cc: Lyude Paul <[email protected]> > Cc: Danilo Krummrich <[email protected]> > Cc: David Airlie <[email protected]> > Cc: Simona Vetter <[email protected]> > Cc: Ralph Campbell <[email protected]> > Cc: Mika Penttilä <[email protected]> > Cc: Matthew Brost <[email protected]> > Cc: Francois Dugast <[email protected]> > > Suggested-by: Zi Yan <[email protected]> > Signed-off-by: Balbir Singh <[email protected]> > --- > include/linux/huge_mm.h | 5 +- > mm/huge_memory.c | 332 ++++++++++++++++++++++------------------ > mm/migrate_device.c | 3 +- > 3 files changed, 191 insertions(+), 149 deletions(-) > LGTM. Acked-by: Zi Yan <[email protected]>
Best Regards, Yan, Zi
