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 <liwanp@linux.vnet.ibm.com>
Reviewed-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index e1703ded543a..4e198ca1f685 100644
--- 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,