diff options
Diffstat (limited to 'include/linux/mm.h')
| -rw-r--r-- | include/linux/mm.h | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 3b337efbe533..66560f1a0564 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -19,6 +19,7 @@ #include <linux/bit_spinlock.h> #include <linux/shrinker.h> #include <linux/resource.h> +#include <linux/page_ext.h> struct mempolicy; struct anon_vma; @@ -2155,20 +2156,36 @@ extern void copy_user_huge_page(struct page *dst, struct page *src, unsigned int pages_per_huge_page); #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ +extern struct page_ext_operations debug_guardpage_ops; +extern struct page_ext_operations page_poisoning_ops; + #ifdef CONFIG_DEBUG_PAGEALLOC extern unsigned int _debug_guardpage_minorder; +extern bool _debug_guardpage_enabled; static inline unsigned int debug_guardpage_minorder(void) { return _debug_guardpage_minorder; } +static inline bool debug_guardpage_enabled(void) +{ + return _debug_guardpage_enabled; +} + static inline bool page_is_guard(struct page *page) { - return test_bit(PAGE_DEBUG_FLAG_GUARD, &page->debug_flags); + struct page_ext *page_ext; + + if (!debug_guardpage_enabled()) + return false; + + page_ext = lookup_page_ext(page); + return test_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags); } #else static inline unsigned int debug_guardpage_minorder(void) { return 0; } +static inline bool debug_guardpage_enabled(void) { return false; } static inline bool page_is_guard(struct page *page) { return false; } #endif /* CONFIG_DEBUG_PAGEALLOC */ |