From: Zhaoyang Huang <zhaoyang.huang@xxxxxxxxxx>
High-order pcp page escaped from checking when both of DEBUG_VM and debug_pagealloc
are all disabled if it allocated again from pcp_list without going to global
free list, which should be introduced by 44042b4498.
fix:44042b4498
Signed-off-by: Zhaoyang Huang <zhaoyang.huang@xxxxxxxxxx>
---
changes of v2: update comments
---
---
mm/page_alloc.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e008a3d..b54976d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1412,7 +1412,7 @@ static __always_inline bool free_pages_prepare(struct page *page,
#ifdef CONFIG_DEBUG_VM
/*
- * With DEBUG_VM enabled, order-0 pages are checked immediately when being freed
+ * With DEBUG_VM enabled, pages are checked immediately when being freed
* to pcp lists. With debug_pagealloc also enabled, they are also rechecked when
* moved from pcp lists to free lists.
*/
@@ -1430,14 +1430,14 @@ static bool bulkfree_pcp_prepare(struct page *page)
}
#else
/*
- * With DEBUG_VM disabled, order-0 pages being freed are checked only when
+ * With DEBUG_VM disabled, pages being freed are checked only when
* moving from pcp lists to free list in order to reduce overhead. With
* debug_pagealloc enabled, they are checked also immediately when being freed
* to the pcp lists.
*/
static bool free_pcp_prepare(struct page *page, unsigned int order)
{
- if (debug_pagealloc_enabled_static())
+ if (debug_pagealloc_enabled_static() || order)
return free_pages_prepare(page, order, true, FPI_NONE);
else
return free_pages_prepare(page, order, false, FPI_NONE);
--
1.9.1
