[Xen-devel] [PATCH v1 7/8] PM / Hibernate: use pfn_to_online_page()

[David Hildenbrand <david@xxxxxxxxxx>]

Let's use pfn_to_online_page() instead of pfn_to_page() when checking
for saveable pages to not save/restore offline memory sections.

Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
Cc: Pavel Machek <pavel@xxxxxx>
Cc: Len Brown <len.brown@xxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Suggested-by: Michal Hocko <mhocko@xxxxxxxxxx>
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
---
 kernel/power/snapshot.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 640b2034edd6..87e6dd57819f 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -1215,8 +1215,8 @@ static struct page *saveable_highmem_page(struct zone 
*zone, unsigned long pfn)
        if (!pfn_valid(pfn))
                return NULL;
 
-       page = pfn_to_page(pfn);
-       if (page_zone(page) != zone)
+       page = pfn_to_online_page(pfn);
+       if (!page || page_zone(page) != zone)
                return NULL;
 
        BUG_ON(!PageHighMem(page));
@@ -1277,8 +1277,8 @@ static struct page *saveable_page(struct zone *zone, 
unsigned long pfn)
        if (!pfn_valid(pfn))
                return NULL;
 
-       page = pfn_to_page(pfn);
-       if (page_zone(page) != zone)
+       page = pfn_to_online_page(pfn);
+       if (!page || page_zone(page) != zone)
                return NULL;
 
        BUG_ON(PageHighMem(page));
-- 
2.17.2


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