1 files changed, 22 insertions, 6 deletions

diff --git a/mm/vmpressure.c b/mm/vmpressure.c
index 736a6011c2c8..0c1e37d829fa 100644
--- a/mm/vmpressure.c
+++ b/mm/vmpressure.c
@@ -180,12 +180,12 @@ static void vmpressure_work_fn(struct work_struct *work)
         if (!vmpr->scanned)
                 return;
 
-        mutex_lock(&vmpr->sr_lock);
+        spin_lock(&vmpr->sr_lock);
         scanned = vmpr->scanned;
         reclaimed = vmpr->reclaimed;
         vmpr->scanned = 0;
         vmpr->reclaimed = 0;
-        mutex_unlock(&vmpr->sr_lock);
+        spin_unlock(&vmpr->sr_lock);
 
         do {
                 if (vmpressure_event(vmpr, scanned, reclaimed))
@@ -240,13 +240,13 @@ void vmpressure(gfp_t gfp, struct mem_cgroup *memcg,
         if (!scanned)
                 return;
 
-        mutex_lock(&vmpr->sr_lock);
+        spin_lock(&vmpr->sr_lock);
         vmpr->scanned += scanned;
         vmpr->reclaimed += reclaimed;
         scanned = vmpr->scanned;
-        mutex_unlock(&vmpr->sr_lock);
+        spin_unlock(&vmpr->sr_lock);
 
-        if (scanned < vmpressure_win || work_pending(&vmpr->work))
+        if (scanned < vmpressure_win)
                 return;
         schedule_work(&vmpr->work);
 }
@@ -367,8 +367,24 @@ void vmpressure_unregister_event(struct cgroup *cg, struct cftype *cft,
  */
 void vmpressure_init(struct vmpressure *vmpr)
 {
-        mutex_init(&vmpr->sr_lock);
+        spin_lock_init(&vmpr->sr_lock);
         mutex_init(&vmpr->events_lock);
         INIT_LIST_HEAD(&vmpr->events);
         INIT_WORK(&vmpr->work, vmpressure_work_fn);
 }
+
+/**
+ * vmpressure_cleanup() - shuts down vmpressure control structure
+ * @vmpr:       Structure to be cleaned up
+ *
+ * This function should be called before the structure in which it is
+ * embedded is cleaned up.
+ */
+void vmpressure_cleanup(struct vmpressure *vmpr)
+{
+        /*
+         * Make sure there is no pending work before eventfd infrastructure
+         * goes away.
+         */
+        flush_work(&vmpr->work);
+}