PM / hibernate: use unsigned local variables in swsusp_show_speed()

do_div() needs 'u64' type, or it reports warning. And negative number
is meaningless for "speed", so change all signed to unsigned within
swsusp_show_speed().

The related warning (with allmodconfig for unicore32):

    CC      kernel/power/hibernate.o
  kernel/power/hibernate.c: In function ‘swsusp_show_speed’:
  kernel/power/hibernate.c:237: warning: comparison of distinct pointer types lacks a cast

Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
[rjw: Subject]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 9 insertions, 5 deletions

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index f4f2073711d3..de4b989cc8fd 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -228,19 +228,23 @@ static void platform_recover(int platform_mode)
 void swsusp_show_speed(struct timeval *start, struct timeval *stop,
                         unsigned nr_pages, char *msg)
 {
-        s64 elapsed_centisecs64;
-        int centisecs;
-        int k;
-        int kps;
+        u64 elapsed_centisecs64;
+        unsigned int centisecs;
+        unsigned int k;
+        unsigned int kps;
 
         elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start);
+        /*
+         * If "(s64)elapsed_centisecs64 < 0", it will print long elapsed time,
+         * it is obvious enough for what went wrong.
+         */
         do_div(elapsed_centisecs64, NSEC_PER_SEC / 100);
         centisecs = elapsed_centisecs64;
         if (centisecs == 0)
                 centisecs = 1;  /* avoid div-by-zero */
         k = nr_pages * (PAGE_SIZE / 1024);
         kps = (k * 100) / centisecs;
-        printk(KERN_INFO "PM: %s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n",
+        printk(KERN_INFO "PM: %s %u kbytes in %u.%02u seconds (%u.%02u MB/s)\n",
                         msg, k,
                         centisecs / 100, centisecs % 100,
                         kps / 1000, (kps % 1000) / 10);