sched/numa: Slow scan rate if no NUMA hinting faults are being recorded

[platform/adaptation/renesas_rcar/renesas_kernel.git] / fs / direct-io.c

diff --git a/fs/direct-io.c b/fs/direct-io.c
index 1782023..0e04142 100644 (file)
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -544,6 +544,7 @@ static inline int dio_bio_reap(struct dio *dio, struct dio_submit *sdio)
  */
 static int sb_init_dio_done_wq(struct super_block *sb)
 {
+       struct workqueue_struct *old;
        struct workqueue_struct *wq = alloc_workqueue("dio/%s",
                                                      WQ_MEM_RECLAIM, 0,
                                                      sb->s_id);
@@ -552,9 +553,9 @@ static int sb_init_dio_done_wq(struct super_block *sb)
        /*
         * This has to be atomic as more DIOs can race to create the workqueue
         */
-       cmpxchg(&sb->s_dio_done_wq, NULL, wq);
+       old = cmpxchg(&sb->s_dio_done_wq, NULL, wq);
        /* Someone created workqueue before us? Free ours... */
-       if (wq != sb->s_dio_done_wq)
+       if (old)
                destroy_workqueue(wq);
        return 0;
 }