1 files changed, 29 insertions, 13 deletions

diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 95250d7c8d91..72a020cabb4c 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -875,8 +875,8 @@ static inline void *saveable_highmem_page(unsigned long pfn) { return NULL; }
 #endif /* CONFIG_HIGHMEM */
 
 /**
- *      saveable - Determine whether a non-highmem page should be included in
- *      the suspend image.
+ *      saveable_page - Determine whether a non-highmem page should be included
+ *      in the suspend image.
  *
  *      We should save the page if it isn't Nosave, and is not in the range
  *      of pages statically defined as 'unsaveable', and it isn't a part of
@@ -897,7 +897,8 @@ static struct page *saveable_page(unsigned long pfn)
         if (swsusp_page_is_forbidden(page) || swsusp_page_is_free(page))
                 return NULL;
 
-        if (PageReserved(page) && pfn_is_nosave(pfn))
+        if (PageReserved(page)
+            && (!kernel_page_present(page) || pfn_is_nosave(pfn)))
                 return NULL;
 
         return page;
@@ -938,6 +939,25 @@ static inline void do_copy_page(long *dst, long *src)
                 *dst++ = *src++;
 }
 
+
+/**
+ *      safe_copy_page - check if the page we are going to copy is marked as
+ *              present in the kernel page tables (this always is the case if
+ *              CONFIG_DEBUG_PAGEALLOC is not set and in that case
+ *              kernel_page_present() always returns 'true').
+ */
+static void safe_copy_page(void *dst, struct page *s_page)
+{
+        if (kernel_page_present(s_page)) {
+                do_copy_page(dst, page_address(s_page));
+        } else {
+                kernel_map_pages(s_page, 1, 1);
+                do_copy_page(dst, page_address(s_page));
+                kernel_map_pages(s_page, 1, 0);
+        }
+}
+
+
 #ifdef CONFIG_HIGHMEM
 static inline struct page *
 page_is_saveable(struct zone *zone, unsigned long pfn)
@@ -946,8 +966,7 @@ page_is_saveable(struct zone *zone, unsigned long pfn)
                         saveable_highmem_page(pfn) : saveable_page(pfn);
 }
 
-static inline void
-copy_data_page(unsigned long dst_pfn, unsigned long src_pfn)
+static void copy_data_page(unsigned long dst_pfn, unsigned long src_pfn)
 {
         struct page *s_page, *d_page;
         void *src, *dst;
@@ -961,29 +980,26 @@ copy_data_page(unsigned long dst_pfn, unsigned long src_pfn)
                 kunmap_atomic(src, KM_USER0);
                 kunmap_atomic(dst, KM_USER1);
         } else {
-                src = page_address(s_page);
                 if (PageHighMem(d_page)) {
                         /* Page pointed to by src may contain some kernel
                          * data modified by kmap_atomic()
                          */
-                        do_copy_page(buffer, src);
+                        safe_copy_page(buffer, s_page);
                         dst = kmap_atomic(pfn_to_page(dst_pfn), KM_USER0);
                         memcpy(dst, buffer, PAGE_SIZE);
                         kunmap_atomic(dst, KM_USER0);
                 } else {
-                        dst = page_address(d_page);
-                        do_copy_page(dst, src);
+                        safe_copy_page(page_address(d_page), s_page);
                 }
         }
 }
 #else
 #define page_is_saveable(zone, pfn)     saveable_page(pfn)
 
-static inline void
-copy_data_page(unsigned long dst_pfn, unsigned long src_pfn)
+static inline void copy_data_page(unsigned long dst_pfn, unsigned long src_pfn)
 {
-        do_copy_page(page_address(pfn_to_page(dst_pfn)),
-                        page_address(pfn_to_page(src_pfn)));
+        safe_copy_page(page_address(pfn_to_page(dst_pfn)),
+                                pfn_to_page(src_pfn));
 }
 #endif /* CONFIG_HIGHMEM */