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 ze3uLa/8 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uniform_split) >> + struct list_head *list, bool uniform_split, bool unmapped) >> { >> struct deferred_split *ds_queue = get_deferred_split_queue(folio); >> XA_STATE(xas, &folio->mapping->i_pages, folio->index); >> @@ -3765,13 +3757,15 @@ static int __folio_split(struct folio *folio, unsigned int new_order, >> * is taken to serialise against parallel split or collapse >> * operations. >> */ >> - anon_vma = folio_get_anon_vma(folio); >> - if (!anon_vma) { >> - ret = -EBUSY; >> - goto out; >> + if (!unmapped) { >> + anon_vma = folio_get_anon_vma(folio); >> + if (!anon_vma) { >> + ret = -EBUSY; >> + goto out; >> + } >> + anon_vma_lock_write(anon_vma); >> } >> mapping = NULL; >> - anon_vma_lock_write(anon_vma); >> } else { >> unsigned int min_order; >> gfp_t gfp; >> @@ -3838,7 +3832,8 @@ static int __folio_split(struct folio *folio, unsigned int new_order, >> goto out_unlock; >> } >> >> - unmap_folio(folio); >> + if (!unmapped) >> + unmap_folio(folio); >> >> /* block interrupt reentry in xa_lock and spinlock */ >> local_irq_disable(); >> @@ -3925,10 +3920,13 @@ static int __folio_split(struct folio *folio, unsigned int new_order, >> >> next = folio_next(new_folio); >> >> + zone_device_private_split_cb(folio, new_folio); >> + >> expected_refs = folio_expected_ref_count(new_folio) + 1; >> folio_ref_unfreeze(new_folio, expected_refs); >> >> - lru_add_split_folio(folio, new_folio, lruvec, list); >> + if (!unmapped) >> + lru_add_split_folio(folio, new_folio, lruvec, list); >> >> /* >> * Anonymous folio with swap cache. >> @@ -3959,6 +3957,8 @@ static int __folio_split(struct folio *folio, unsigned int new_order, >> __filemap_remove_folio(new_folio, NULL); >> folio_put_refs(new_folio, nr_pages); >> } >> + >> + zone_device_private_split_cb(folio, NULL); >> /* >> * Unfreeze @folio only after all page cache entries, which >> * used to point to it, have been updated with new folios. >> @@ -3982,6 +3982,9 @@ static int __folio_split(struct folio *folio, unsigned int new_order, >> >> local_irq_enable(); >> >> + if (unmapped) >> + return ret; > > As the comment of __folio_split() and __split_huge_page_to_list_to_order() > mentioned: > > * The large folio must be locked > * After splitting, the after-split folio containing @lock_at remains locked > > But here we seems to change the prerequisites. > > Hmm.. I am not sure this is correct. > The code is correct, but you are right in that the documentation needs to be updated. When "unmapped", we do want to leave the folios locked after the split. Balbir