diff options
Diffstat (limited to 'mm/memremap.c')
| -rw-r--r-- | mm/memremap.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/mm/memremap.c b/mm/memremap.c index 5f04a0709e43..55d23e9f5c04 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -501,4 +501,25 @@ void free_devmap_managed_page(struct page *page) page->mapping = NULL; page->pgmap->ops->page_free(page); } + +void put_devmap_managed_page(struct page *page) +{ + int count; + + if (WARN_ON_ONCE(!page_is_devmap_managed(page))) + return; + + count = page_ref_dec_return(page); + + /* + * devmap page refcounts are 1-based, rather than 0-based: if + * refcount is 1, then the page is free and the refcount is + * stable because nobody holds a reference on the page. + */ + if (count == 1) + free_devmap_managed_page(page); + else if (!count) + __put_page(page); +} +EXPORT_SYMBOL(put_devmap_managed_page); #endif /* CONFIG_DEV_PAGEMAP_OPS */ |