From: SeongJae Park <sjpark@xxxxxxxxx>
'Idle page tracking' users can pass random pfn that might be mapped to
an offline page. To avoid accessing such pages, this commit modifies
the 'page_idle_get_page()' to use 'pfn_to_online_page()' instead of
'pfn_valid()' and 'pfn_to_page()' combination, so that the pfn mapped to
an offline page can be skipped.
Signed-off-by: SeongJae Park <sjpark@xxxxxxxxx>
Reported-by: David Hildenbrand <david@xxxxxxxxxx>
---
mm/page_idle.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/mm/page_idle.c b/mm/page_idle.c
index 295512465065..057c61df12db 100644
--- a/mm/page_idle.c
+++ b/mm/page_idle.c
@@ -4,6 +4,7 @@
#include <linux/fs.h>
#include <linux/sysfs.h>
#include <linux/kobject.h>
+#include <linux/memory_hotplug.h>
#include <linux/mm.h>
#include <linux/mmzone.h>
#include <linux/pagemap.h>
@@ -30,13 +31,9 @@
*/
static struct page *page_idle_get_page(unsigned long pfn)
{
- struct page *page;
+ struct page *page = pfn_to_online_page(pfn);
pg_data_t *pgdat;
- if (!pfn_valid(pfn))
- return NULL;
-
- page = pfn_to_page(pfn);
if (!page || !PageLRU(page) ||
!get_page_unless_zero(page))
return NULL;
--
2.17.1
