1 files changed, 9 insertions, 0 deletions

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 4fa8d84599b0..e0fc963acc41 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1259,6 +1259,12 @@ static bool __purge_vmap_area_lazy(unsigned long start, unsigned long end)
                 return false;
 
         /*
+         * First make sure the mappings are removed from all page-tables
+         * before they are freed.
+         */
+        vmalloc_sync_all();
+
+        /*
          * TODO: to calculate a flush range without looping.
          * The list can be up to lazy_max_pages() elements.
          */
@@ -3038,6 +3044,9 @@ EXPORT_SYMBOL(remap_vmalloc_range);
 /*
  * Implement a stub for vmalloc_sync_all() if the architecture chose not to
  * have one.
+ *
+ * The purpose of this function is to make sure the vmalloc area
+ * mappings are identical in all page-tables in the system.
  */
 void __weak vmalloc_sync_all(void)
 {