[PATCH v4 3/6] mm/writeback: commit reason of WB_REASON_FORKER_THREAD mismatch name

[Wanpeng Li]

Changelog:
 v3 - > v4:
    * add Tejun's Reviewed-by
	* explicitly point to the TPs rather than saying "somewhat" visible 

After commit 839a8e86("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.

Reviewed-by: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
---
 include/linux/writeback.h |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index 8b5cec4..ac73a9d 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -47,6 +47,11 @@ 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,
-- 
1.7.5.4

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