[PATCH v2 1/2] mm/page_ext: support to record the last stack of page

[Walter Wu]

KASAN will record last stack of page in order to help programmer
to see memory corruption caused by page.

What is difference between page_owner and our patch?
page_owner records alloc stack of page, but our patch is to record
last stack(it may be alloc or free stack of page).

Signed-off-by: Walter Wu <walter-zh.wu@xxxxxxxxxxxx>
---
 mm/page_ext.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/page_ext.c b/mm/page_ext.c
index 5f5769c7db3b..7ca33dcd9ffa 100644
--- a/mm/page_ext.c
+++ b/mm/page_ext.c
@@ -65,6 +65,9 @@ static struct page_ext_operations *page_ext_ops[] = {
 #if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT)
 	&page_idle_ops,
 #endif
+#ifdef CONFIG_KASAN
+	&page_stack_ops,
+#endif
 };
 
 static unsigned long total_usage;
-- 
2.18.0