[PATCH 6/6] writeback: remove unneeded GDTC_INIT_NO_WB

[Kemeng Shi]

We never use gdtc->dom set with GDTC_INIT_NO_WB, just remove unneeded
GDTC_INIT_NO_WB

Signed-off-by: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
---
 mm/page-writeback.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 481b6bf34c21..09b2b0754cc5 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -154,8 +154,6 @@ 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 +208,6 @@ 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)
@@ -438,7 +435,7 @@ static void domain_dirty_limits(struct dirty_throttle_control *dtc)
  */
 void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty)
 {
-	struct dirty_throttle_control gdtc = { GDTC_INIT_NO_WB };
+	struct dirty_throttle_control gdtc = { };
 
 	gdtc.avail = global_dirtyable_memory();
 	domain_dirty_limits(&gdtc);
@@ -895,7 +892,7 @@ unsigned long wb_calc_thresh(struct bdi_writeback *wb, unsigned long thresh)
 
 unsigned long wb_calc_cg_thresh(struct bdi_writeback *wb)
 {
-	struct dirty_throttle_control gdtc = { GDTC_INIT_NO_WB };
+	struct dirty_throttle_control gdtc = { };
 	struct dirty_throttle_control mdtc = { MDTC_INIT(wb, &gdtc) };
 	unsigned long filepages, headroom, writeback;
 
-- 
2.30.0