Linux MM drops PG_private to free a flag bit for folios
Zi Yan's patchset replaces the page flag with pointer checks so a scarce bit can become PG_folio.
By kexec#page-flags
Kernel RFC aims to drop PG_private for a new folio flag bit
Zi Yan’s series would free a scarce page-flag bit by treating a non-NULL private pointer as the sole signal that a page carries filesystem or driver state.
By kexec