1 files changed, 6 insertions, 6 deletions

diff --git a/mm/mmap.c b/mm/mmap.c
index 8a49df4c7363..2c1c2cb0e2e1 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -86,7 +86,7 @@ EXPORT_SYMBOL(vm_get_page_prot);
 int sysctl_overcommit_memory = OVERCOMMIT_GUESS;  /* heuristic overcommit */
 int sysctl_overcommit_ratio = 50;       /* default is 50% */
 int sysctl_max_map_count __read_mostly = DEFAULT_MAX_MAP_COUNT;
-atomic_long_t vm_committed_space = ATOMIC_LONG_INIT(0);
+struct percpu_counter vm_committed_as;
 
 /*
  * Check that a process has enough memory to allocate a new virtual
@@ -180,11 +180,7 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
         if (mm)
                 allowed -= mm->total_vm / 32;
 
-        /*
-         * cast `allowed' as a signed long because vm_committed_space
-         * sometimes has a negative value
-         */
-        if (atomic_long_read(&vm_committed_space) < (long)allowed)
+        if (percpu_counter_read_positive(&vm_committed_as) < allowed)
                 return 0;
 error:
         vm_unacct_memory(pages);
@@ -2491,4 +2487,8 @@ void mm_drop_all_locks(struct mm_struct *mm)
  */
 void __init mmap_init(void)
 {
+        int ret;
+
+        ret = percpu_counter_init(&vm_committed_as, 0);
+        VM_BUG_ON(ret);
 }