[PATCH 04/10] writeback use [global/wb]_domain_dirty_avail helper in cgwb_calc_thresh

[Kemeng Shi <shikemeng@huaweicloud.com>]

Use [global/wb]_domain_dirty_avail helper in cgwb_calc_thresh to remove
repeated code.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
---
 mm/page-writeback.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 28a29180fc9f..a1d48e8387ed 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -934,16 +934,9 @@ unsigned long cgwb_calc_thresh(struct bdi_writeback *wb)
 {
 	struct dirty_throttle_control gdtc = { GDTC_INIT_NO_WB };
 	struct dirty_throttle_control mdtc = { MDTC_INIT(wb, &gdtc) };
-	unsigned long filepages = 0, headroom = 0, writeback = 0;
-
-	gdtc.avail = global_dirtyable_memory();
-	gdtc.dirty = global_node_page_state(NR_FILE_DIRTY) +
-		     global_node_page_state(NR_WRITEBACK);
 
-	mem_cgroup_wb_stats(wb, &filepages, &headroom,
-			    &mdtc.dirty, &writeback);
-	mdtc.dirty += writeback;
-	mdtc_calc_avail(&mdtc, filepages, headroom);
+	global_domain_dirty_avail(&gdtc, false);
+	wb_domain_dirty_avail(&mdtc, false);
 	domain_dirty_limits(&mdtc);
 
 	return __wb_calc_thresh(&mdtc, mdtc.thresh);
-- 
2.30.0