diff options
Diffstat (limited to 'mm/internal.h')
| -rw-r--r-- | mm/internal.h | 44 |
1 files changed, 0 insertions, 44 deletions
diff --git a/mm/internal.h b/mm/internal.h index 38e24b89e4c4..569facd1f6da 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -66,50 +66,6 @@ static inline void set_page_refcounted(struct page *page) set_page_count(page, 1); } -static inline void __get_page_tail_foll(struct page *page, - bool get_page_head) -{ - /* - * If we're getting a tail page, the elevated page->_count is - * required only in the head page and we will elevate the head - * page->_count and tail page->_mapcount. - * - * We elevate page_tail->_mapcount for tail pages to force - * page_tail->_count to be zero at all times to avoid getting - * false positives from get_page_unless_zero() with - * speculative page access (like in - * page_cache_get_speculative()) on tail pages. - */ - VM_BUG_ON_PAGE(atomic_read(&compound_head(page)->_count) <= 0, page); - if (get_page_head) - atomic_inc(&compound_head(page)->_count); - get_huge_page_tail(page); -} - -/* - * This is meant to be called as the FOLL_GET operation of - * follow_page() and it must be called while holding the proper PT - * lock while the pte (or pmd_trans_huge) is still mapping the page. - */ -static inline void get_page_foll(struct page *page) -{ - if (unlikely(PageTail(page))) - /* - * This is safe only because - * __split_huge_page_refcount() can't run under - * get_page_foll() because we hold the proper PT lock. - */ - __get_page_tail_foll(page, true); - else { - /* - * Getting a normal page or the head of a compound page - * requires to already have an elevated page->_count. - */ - VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page); - atomic_inc(&page->_count); - } -} - extern unsigned long highest_memmap_pfn; /* |