diff options
Diffstat (limited to 'mm/gup.c')
| -rw-r--r-- | mm/gup.c | 38 |
1 files changed, 12 insertions, 26 deletions
@@ -29,23 +29,6 @@ struct follow_page_context { unsigned int page_mask; }; -/* Equivalent to calling put_page() @refs times. */ -static void put_page_refs(struct page *page, int refs) -{ -#ifdef CONFIG_DEBUG_VM - if (VM_WARN_ON_ONCE_PAGE(page_ref_count(page) < refs, page)) - return; -#endif - - /* - * Calling put_page() for each ref is unnecessarily slow. Only the last - * ref needs a put_page(). - */ - if (refs > 1) - page_ref_sub(page, refs - 1); - put_page(page); -} - /* * Return the folio with ref appropriately incremented, * or NULL if that failed. @@ -156,20 +139,23 @@ struct page *try_grab_compound_head(struct page *page, return &try_grab_folio(page, refs, flags)->page; } -static void put_compound_head(struct page *page, int refs, unsigned int flags) +static void gup_put_folio(struct folio *folio, int refs, unsigned int flags) { - VM_BUG_ON_PAGE(PageTail(page), page); - if (flags & FOLL_PIN) { - mod_node_page_state(page_pgdat(page), NR_FOLL_PIN_RELEASED, - refs); - if (PageHead(page)) - atomic_sub(refs, compound_pincount_ptr(page)); + node_stat_mod_folio(folio, NR_FOLL_PIN_RELEASED, refs); + if (folio_test_large(folio)) + atomic_sub(refs, folio_pincount_ptr(folio)); else refs *= GUP_PIN_COUNTING_BIAS; } - put_page_refs(page, refs); + folio_put_refs(folio, refs); +} + +static void put_compound_head(struct page *page, int refs, unsigned int flags) +{ + VM_BUG_ON_PAGE(PageTail(page), page); + gup_put_folio((struct folio *)page, refs, flags); } /** @@ -230,7 +216,7 @@ bool __must_check try_grab_page(struct page *page, unsigned int flags) */ void unpin_user_page(struct page *page) { - put_compound_head(compound_head(page), 1, FOLL_PIN); + gup_put_folio(page_folio(page), 1, FOLL_PIN); } EXPORT_SYMBOL(unpin_user_page); |