From: Jinliang Zheng <alexjlzheng@tencent.com>
Date: Tue, 8 Aug 2023 08:44:32 +0000 (+0800)
Subject: writeback: remove redundant checks for root memcg
X-Git-Tag: v6.6.7~1970^2~162
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9af7c7426c2e49bad77cf7494fea85a773d1ded6;p=platform%2Fkernel%2Flinux-starfive.git

writeback: remove redundant checks for root memcg

The check for root memcg will be done in wb_get_lookup(), so remove the
redundant one to simplify the code.

Link: https://lkml.kernel.org/r/20230808084431.1632934-1-alexjlzheng@tencent.com
Signed-off-by: Jinliang Zheng <alexjlzheng@tencent.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index fc44bfb..1e3447b 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -732,9 +732,6 @@ struct bdi_writeback *wb_get_create(struct backing_dev_info *bdi,
 
 	might_alloc(gfp);
 
-	if (!memcg_css->parent)
-		return &bdi->wb;
-
 	do {
 		wb = wb_get_lookup(bdi, memcg_css);
 	} while (!wb && !cgwb_create(bdi, memcg_css, gfp));