PM/Hibernate: exclude all PageOffline() pages

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.

In saveable_highmem_page(), move the PageReserved() check to a new check
along with the PageOffline() check to separate it from the swsusp
checks.

[[e-mail]: v2]
Link: http://lkml.kernel.org/r/[e-mail]
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: David Hildenbrand <[e-mail]>
Acked-by: Pavel Machek <[e-mail]>
Acked-by: Rafael J. Wysocki <[e-mail]>
Cc: Pavel Machek <[e-mail]>
Cc: Len Brown <[e-mail]>
Cc: Matthew Wilcox <[e-mail]>
Cc: Michal Hocko <[e-mail]>
Cc: "Michael S. Tsirkin" <[e-mail]>
Cc: Alexander Duyck <[e-mail]>
Cc: Alexey Dobriyan <[e-mail]>
Cc: Arnd Bergmann <[e-mail]>
Cc: Baoquan He <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Cc: Boris Ostrovsky <[e-mail]>
Cc: Christian Hansen <[e-mail]>
Cc: Dave Young <[e-mail]>
Cc: David Rientjes <[e-mail]>
Cc: Greg Kroah-Hartman <[e-mail]>
Cc: Haiyang Zhang <[e-mail]>
Cc: Jonathan Corbet <[e-mail]>
Cc: Juergen Gross <[e-mail]>
Cc: Julien Freche <[e-mail]>
Cc: Kairui Song <[e-mail]>
Cc: Kazuhito Hagio <[e-mail]>
Cc: "Kirill A. Shutemov" <[e-mail]>
Cc: Konstantin Khlebnikov <[e-mail]>
Cc: "K. Y. Srinivasan" <[e-mail]>
Cc: Lianbo Jiang <[e-mail]>
Cc: Michal Hocko <[e-mail]>
Cc: Mike Rapoport <[e-mail]>
Cc: Miles Chen <[e-mail]>
Cc: Nadav Amit <[e-mail]>
Cc: Naoya Horiguchi <[e-mail]>
Cc: Omar Sandoval <[e-mail]>
Cc: Pankaj gupta <[e-mail]>
Cc: Pavel Tatashin <[e-mail]>
Cc: "Rafael J. Wysocki" <[e-mail]>
Cc: Stefano Stabellini <[e-mail]>
Cc: Stephen Hemminger <[e-mail]>
Cc: Stephen Rothwell <[e-mail]>
Cc: Vitaly Kuznetsov <[e-mail]>
Cc: Vlastimil Babka <[e-mail]>
Cc: Xavier Deguillard <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

kernel/power/snapshot.c

···
 
 	BUG_ON(!PageHighMem(page));
 
-	if (swsusp_page_is_forbidden(page) ||  swsusp_page_is_free(page) ||
-	    PageReserved(page))
+	if (swsusp_page_is_forbidden(page) ||  swsusp_page_is_free(page))
+		return NULL;
+
+	if (PageReserved(page) || PageOffline(page))
 		return NULL;
 
 	if (page_is_guard(page))
···
 	BUG_ON(PageHighMem(page));
 
 	if (swsusp_page_is_forbidden(page) || swsusp_page_is_free(page))
+		return NULL;
+
+	if (PageOffline(page))
 		return NULL;
 
 	if (PageReserved(page)