1 files changed, 22 insertions, 0 deletions

diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index b02228411d57..4f0f0604f1c4 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -1132,6 +1132,28 @@ void free_basic_memory_bitmaps(void)
         pr_debug("PM: Basic memory bitmaps freed\n");
 }
 
+void clear_free_pages(void)
+{
+#ifdef CONFIG_PAGE_POISONING_ZERO
+        struct memory_bitmap *bm = free_pages_map;
+        unsigned long pfn;
+
+        if (WARN_ON(!(free_pages_map)))
+                return;
+
+        memory_bm_position_reset(bm);
+        pfn = memory_bm_next_pfn(bm);
+        while (pfn != BM_END_OF_MAP) {
+                if (pfn_valid(pfn))
+                        clear_highpage(pfn_to_page(pfn));
+
+                pfn = memory_bm_next_pfn(bm);
+        }
+        memory_bm_position_reset(bm);
+        pr_info("PM: free pages cleared after restore\n");
+#endif /* PAGE_POISONING_ZERO */
+}
+
 /**
  * snapshot_additional_pages - Estimate the number of extra pages needed.
  * @zone: Memory zone to carry out the computation for.