[Xen-devel] [PATCH RFC 6/6] PM / Hibernate: exclude all PageOffline() pages

[David Hildenbrand <david@xxxxxxxxxx>]

The content of pages that are marked PG_offline is not of interest
(e.g. inflated by a balloon driver), let's skip these pages.

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>
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
---
 kernel/power/snapshot.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index b0308a2c6000..01db1d13481a 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -1222,7 +1222,7 @@ static struct page *saveable_highmem_page(struct zone 
*zone, unsigned long pfn)
        BUG_ON(!PageHighMem(page));
 
        if (swsusp_page_is_forbidden(page) ||  swsusp_page_is_free(page) ||
-           PageReserved(page))
+           PageReserved(page) || PageOffline(page))
                return NULL;
 
        if (page_is_guard(page))
@@ -1286,6 +1286,9 @@ static struct page *saveable_page(struct zone *zone, 
unsigned long pfn)
        if (swsusp_page_is_forbidden(page) || swsusp_page_is_free(page))
                return NULL;
 
+       if (PageOffline(page))
+               return NULL;
+
        if (PageReserved(page)
            && (!kernel_page_present(page) || pfn_is_nosave(pfn)))
                return NULL;
-- 
2.17.2


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