linux-kernel - [PATCH-cgroup] cgroup/cpuset: Fix incorrect top

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Date: Tue, 23 Apr 2024 21:00:20 -0400
From: Waiman Long <longman@...hat.com>
To: Tejun Heo <tj@...nel.org>,
	Zefan Li <lizefan.x@...edance.com>,
	Johannes Weiner <hannes@...xchg.org>
Cc: linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org,
	Xiu Jianfeng <xiujianfeng@...wei.com>,
	Waiman Long <longman@...hat.com>
Subject: [PATCH-cgroup] cgroup/cpuset: Fix incorrect top_cpuset flags

Commit 8996f93fc388 ("cgroup/cpuset: Statically initialize more
members of top_cpuset") uses an incorrect "<" relational operator for
the CS_SCHED_LOAD_BALANCE bit when initializing the top_cpuset. This
results in load_balancing turned off by default in the top cpuset which
is bad for performance.

Fix this by using the BIT() helper macro to set the desired top_cpuset
flags and avoid similar mistake from being made in the future.

Fixes: 8996f93fc388 ("cgroup/cpuset: Statically initialize more members of top_cpuset")
Signed-off-by: Waiman Long <longman@...hat.com>
---
 kernel/cgroup/cpuset.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index e70008a1d86a..b0a97efa5f20 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -368,8 +368,8 @@ static inline void notify_partition_change(struct cpuset *cs, int old_prs)
 }
 
 static struct cpuset top_cpuset = {
-	.flags = ((1 << CS_ONLINE) | (1 << CS_CPU_EXCLUSIVE) |
-		  (1 << CS_MEM_EXCLUSIVE) | (1 < CS_SCHED_LOAD_BALANCE)),
+	.flags = BIT(CS_ONLINE) | BIT(CS_CPU_EXCLUSIVE) |
+		 BIT(CS_MEM_EXCLUSIVE) | BIT(CS_SCHED_LOAD_BALANCE),
 	.partition_root_state = PRS_ROOT,
 	.relax_domain_level = -1,
 	.remote_sibling = LIST_HEAD_INIT(top_cpuset.remote_sibling),
-- 
2.39.3