linux-kernel - [PATCH] sched/topology: remove unneeded do while loop in cpu_attach

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Date:   Sat, 17 Jun 2023 16:19:26 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <mingo@...hat.com>, <peterz@...radead.org>,
        <juri.lelli@...hat.com>, <vincent.guittot@...aro.org>
CC:     <dietmar.eggemann@....com>, <rostedt@...dmis.org>,
        <bsegall@...gle.com>, <mgorman@...e.de>, <bristot@...hat.com>,
        <vschneid@...hat.com>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH] sched/topology: remove unneeded do while loop in cpu_attach_domain()

When sg != sd->groups, the do while loop would cause deadloop here. But
that won't occur because sg is always equal to sd->groups now. Remove
this unneeded do while loop.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 kernel/sched/topology.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index ca4472281c28..9010c93c3fdb 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -750,10 +750,7 @@ cpu_attach_domain(struct sched_domain *sd, struct root_domain *rd, int cpu)
 			 * domain for convenience. Clear such flags since
 			 * the child is being destroyed.
 			 */
-			do {
-				sg->flags = 0;
-			} while (sg != sd->groups);
-
+			sg->flags = 0;
 			sd->child = NULL;
 		}
 	}
-- 
2.27.0