[PATCH v2 6/6] writeback: define GDTC_INIT_NO_WB to null

[Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>]

We never use gdtc->dom set with GDTC_INIT_NO_WB, just remove unneeded
initialization of gdtc->dom for now.

Signed-off-by: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
---
 mm/page-writeback.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 211565d01600..2fd2fd2e1932 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -147,6 +147,7 @@ struct dirty_throttle_control {
  * reflect changes in current writeout rate.
  */
 #define VM_COMPLETIONS_PERIOD_LEN (3*HZ)
+#define GDTC_INIT_NO_WB
 
 #ifdef CONFIG_CGROUP_WRITEBACK
 
@@ -154,8 +155,6 @@ struct dirty_throttle_control {
 				.dom = &global_wb_domain,		\
 				.wb_completions = &(__wb)->completions
 
-#define GDTC_INIT_NO_WB		.dom = &global_wb_domain
-
 #define MDTC_INIT(__wb, __gdtc)	.wb = (__wb),				\
 				.dom = mem_cgroup_wb_domain(__wb),	\
 				.wb_completions = &(__wb)->memcg_completions, \
@@ -210,7 +209,6 @@ static void wb_min_max_ratio(struct bdi_writeback *wb,
 
 #define GDTC_INIT(__wb)		.wb = (__wb),                           \
 				.wb_completions = &(__wb)->completions
-#define GDTC_INIT_NO_WB
 #define MDTC_INIT(__wb, __gdtc)
 
 static bool mdtc_valid(struct dirty_throttle_control *dtc)
-- 
2.30.0