diff options
| -rw-r--r-- | include/linux/mm.h | 21 | ||||
| -rw-r--r-- | mm/util.c | 23 |
2 files changed, 24 insertions, 20 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 5b375133c695..9c2852cabf01 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1032,26 +1032,7 @@ static inline pgoff_t page_file_index(struct page *page) return page->index; } -/* - * Return true if this page is mapped into pagetables. - * For compound page it returns true if any subpage of compound page is mapped. - */ -static inline bool page_mapped(struct page *page) -{ - int i; - if (likely(!PageCompound(page))) - return atomic_read(&page->_mapcount) >= 0; - page = compound_head(page); - if (atomic_read(compound_mapcount_ptr(page)) >= 0) - return true; - if (PageHuge(page)) - return false; - for (i = 0; i < hpage_nr_pages(page); i++) { - if (atomic_read(&page[i]._mapcount) >= 0) - return true; - } - return false; -} +bool page_mapped(struct page *page); /* * Return true only if the page has been allocated with diff --git a/mm/util.c b/mm/util.c index 6cc81e7b8705..8a1b3a1fb595 100644 --- a/mm/util.c +++ b/mm/util.c @@ -346,6 +346,29 @@ void *page_rmapping(struct page *page) return __page_rmapping(page); } +/* + * Return true if this page is mapped into pagetables. + * For compound page it returns true if any subpage of compound page is mapped. + */ +bool page_mapped(struct page *page) +{ + int i; + + if (likely(!PageCompound(page))) + return atomic_read(&page->_mapcount) >= 0; + page = compound_head(page); + if (atomic_read(compound_mapcount_ptr(page)) >= 0) + return true; + if (PageHuge(page)) + return false; + for (i = 0; i < hpage_nr_pages(page); i++) { + if (atomic_read(&page[i]._mapcount) >= 0) + return true; + } + return false; +} +EXPORT_SYMBOL(page_mapped); + struct anon_vma *page_anon_vma(struct page *page) { unsigned long mapping; |