mm/writeback: commit reason of WB_REASON_FORKER_THREAD mismatch name

After commit 839a8e8660b6 ("writeback: replace custom worker pool
implementation with unbound workqueue"), there is no bdi forker thread
any more.  However, WB_REASON_FORKER_THREAD is still used due to it is
TPs userland visible and we won't be exposing exactly the same
information with just a different name.

Signed-off-by: Wanpeng Li <[email protected]>
Reviewed-by: Tejun Heo <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index e1703ded543aed7b2e52fda3ca97c3b99c66cfc0..4e198ca1f685de549b38ced1644d2b2008d18624 100644 (file)
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -47,6 +47,12 @@ enum wb_reason {
        WB_REASON_LAPTOP_TIMER,
        WB_REASON_FREE_MORE_MEM,
        WB_REASON_FS_FREE_SPACE,
+       /*
+        * There is no bdi forker thread any more and works are done
+        * by emergency worker, however, this is TPs userland visible
+        * and we'll be exposing exactly the same information,
+        * so it has a mismatch name.
+        */
        WB_REASON_FORKER_THREAD,
 
        WB_REASON_MAX,