PM / hibernate: exclude freed pages from allocated pages printout

hibernate_preallocate_memory() prints out that how many pages are
allocated, but it doesn't take into consideration the pages freed by
free_unnecessary_pages(). Therefore, it always shows the count more
than actually allocated.

Signed-off-by: Wonhong Kwon <wonhong.kwon@lge.com>
[ rjw: Subject ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 8e75a5a1e9b4..c24d5a23bf93 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -1472,9 +1472,9 @@ static inline unsigned long preallocate_highmem_fraction(unsigned long nr_pages,
 /**
  * free_unnecessary_pages - Release preallocated pages not needed for the image
  */
-static void free_unnecessary_pages(void)
+static unsigned long free_unnecessary_pages(void)
 {
-        unsigned long save, to_free_normal, to_free_highmem;
+        unsigned long save, to_free_normal, to_free_highmem, free;
 
         save = count_data_pages();
         if (alloc_normal >= save) {
@@ -1495,6 +1495,7 @@ static void free_unnecessary_pages(void)
                 else
                         to_free_normal = 0;
         }
+        free = to_free_normal + to_free_highmem;
 
         memory_bm_position_reset(&copy_bm);
 
@@ -1518,6 +1519,8 @@ static void free_unnecessary_pages(void)
                 swsusp_unset_page_free(page);
                 __free_page(page);
         }
+
+        return free;
 }
 
 /**
@@ -1707,7 +1710,7 @@ int hibernate_preallocate_memory(void)
          * pages in memory, but we have allocated more.  Release the excessive
          * ones now.
          */
-        free_unnecessary_pages();
+        pages -= free_unnecessary_pages();
 
  out:
         stop = ktime_get();