1 files changed, 6 insertions, 1 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index e40c0a01d5a6..bc0e96b78dfd 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -28,6 +28,8 @@
 #include <linux/mman.h>
 #include <linux/mmu_notifier.h>
 #include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/vmacache.h>
 #include <linux/nsproxy.h>
 #include <linux/capability.h>
 #include <linux/cpu.h>
@@ -364,7 +366,7 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
 
         mm->locked_vm = 0;
         mm->mmap = NULL;
-        mm->mmap_cache = NULL;
+        mm->vmacache_seqnum = 0;
         mm->map_count = 0;
         cpumask_clear(mm_cpumask(mm));
         mm->mm_rb = RB_ROOT;
@@ -882,6 +884,9 @@ static int copy_mm(unsigned long clone_flags, struct task_struct *tsk)
         if (!oldmm)
                 return 0;
 
+        /* initialize the new vmacache entries */
+        vmacache_flush(tsk);
+
         if (clone_flags & CLONE_VM) {
                 atomic_inc(&oldmm->mm_users);
                 mm = oldmm;