diff --git a/mm/huge_memory.c b/mm/huge_memory.c index a7a247136bd5..8218e9d1887b 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -3438,6 +3438,7 @@ static int __split_unmapped_folio(struct folio *folio, int new_order, { int order = folio_order(folio); int start_order = uniform_split ? new_order : order - 1; + struct folio *old_folio = folio; bool stop_split = false; struct folio *next; int split_order; @@ -3468,12 +3469,16 @@ static int __split_unmapped_folio(struct folio *folio, int new_order, * uniform split has xas_split_alloc() called before * irq is disabled to allocate enough memory, whereas * non-uniform split can handle ENOMEM. + * Use the to-be-split folio, so that a parallel + * folio_try_get() waits on it until xarray is updated + * with after-split folios and the original one is + * unfrozen. */ if (uniform_split) - xas_split(xas, folio, old_order); + xas_split(xas, old_folio, old_order); else { xas_set_order(xas, folio->index, split_order); - xas_try_split(xas, folio, old_order); + xas_try_split(xas, old_folio, old_order); if (xas_error(xas)) { ret = xas_error(xas); stop_split = true;