1 files changed, 9 insertions, 1 deletions

diff --git a/mm/vmpressure.c b/mm/vmpressure.c
index 149fdf6c5c56..6063581f705c 100644
--- a/mm/vmpressure.c
+++ b/mm/vmpressure.c
@@ -112,9 +112,16 @@ static enum vmpressure_levels vmpressure_calc_level(unsigned long scanned,
                                                     unsigned long reclaimed)
 {
         unsigned long scale = scanned + reclaimed;
-        unsigned long pressure;
+        unsigned long pressure = 0;
 
         /*
+         * reclaimed can be greater than scanned in cases
+         * like THP, where the scanned is 1 and reclaimed
+         * could be 512
+         */
+        if (reclaimed >= scanned)
+                goto out;
+        /*
          * We calculate the ratio (in percents) of how many pages were
          * scanned vs. reclaimed in a given time frame (window). Note that
          * time is in VM reclaimer's "ticks", i.e. number of pages
@@ -124,6 +131,7 @@ static enum vmpressure_levels vmpressure_calc_level(unsigned long scanned,
         pressure = scale - (reclaimed * scale / scanned);
         pressure = pressure * 100 / scale;
 
+out:
         pr_debug("%s: %3lu  (s: %lu  r: %lu)\n", __func__, pressure,
                  scanned, reclaimed);