On 11 Aug 2025, at 10:39, David Hildenbrand wrote: > migrate_folio_unmap() is the only user of MIGRATEPAGE_UNMAP. We want to > remove MIGRATEPAGE_* completely. > > It's rather weird to have a generic MIGRATEPAGE_UNMAP, documented to be > returned from address-space callbacks, when it's only used for an > internal helper. > > Let's start by having only a single "success" return value for > migrate_folio_unmap() -- 0 -- by moving the "folio was already freed" > check into the single caller. > > There is a remaining comment for PG_isolated, which we renamed to > PG_movable_ops_isolated recently and forgot to update. > > While we might still run into that case with zsmalloc, it's something we > want to get rid of soon. So let's just focus that optimization on real > folios only for now by excluding movable_ops pages. Note that concurrent > freeing can happen at any time and this "already freed" check is not > relevant for correctness. > > Signed-off-by: David Hildenbrand <david@xxxxxxxxxx> > --- > include/linux/migrate.h | 1 - > mm/migrate.c | 40 ++++++++++++++++++++-------------------- > 2 files changed, 20 insertions(+), 21 deletions(-) > LGTM. Reviewed-by: Zi Yan <ziy@xxxxxxxxxx> Best Regards, Yan, Zi
