summaryrefslogtreecommitdiffstats
path: root/include
diff options
context:
space:
mode:
Diffstat (limited to 'include')
-rw-r--r--include/linux/mm.h17
-rw-r--r--include/linux/page-debug-flags.h4
2 files changed, 20 insertions, 1 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 5d9b4c9813bd..5568553a41fd 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1618,5 +1618,22 @@ extern void copy_user_huge_page(struct page *dst, struct page *src,
unsigned int pages_per_huge_page);
#endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
+#ifdef CONFIG_DEBUG_PAGEALLOC
+extern unsigned int _debug_guardpage_minorder;
+
+static inline unsigned int debug_guardpage_minorder(void)
+{
+ return _debug_guardpage_minorder;
+}
+
+static inline bool page_is_guard(struct page *page)
+{
+ return test_bit(PAGE_DEBUG_FLAG_GUARD, &page->debug_flags);
+}
+#else
+static inline unsigned int debug_guardpage_minorder(void) { return 0; }
+static inline bool page_is_guard(struct page *page) { return false; }
+#endif /* CONFIG_DEBUG_PAGEALLOC */
+
#endif /* __KERNEL__ */
#endif /* _LINUX_MM_H */
diff --git a/include/linux/page-debug-flags.h b/include/linux/page-debug-flags.h
index b0638fd91e92..22691f614043 100644
--- a/include/linux/page-debug-flags.h
+++ b/include/linux/page-debug-flags.h
@@ -13,6 +13,7 @@
enum page_debug_flags {
PAGE_DEBUG_FLAG_POISON, /* Page is poisoned */
+ PAGE_DEBUG_FLAG_GUARD,
};
/*
@@ -21,7 +22,8 @@ enum page_debug_flags {
*/
#ifdef CONFIG_WANT_PAGE_DEBUG_FLAGS
-#if !defined(CONFIG_PAGE_POISONING) \
+#if !defined(CONFIG_PAGE_POISONING) && \
+ !defined(CONFIG_PAGE_GUARD) \
/* && !defined(CONFIG_PAGE_DEBUG_SOMETHING_ELSE) && ... */
#error WANT_PAGE_DEBUG_FLAGS is turned on with no debug features!
#endif