linux-kernel - [PATCH 1/2] cgroup: rstat: explicitly put loop variant in while

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Message-Id: <20211225000932.7253-1-richard.weiyang@gmail.com>
Date:   Sat, 25 Dec 2021 00:09:31 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     tj@...nel.org, lizefan.x@...edance.com, hannes@...xchg.org
Cc:     cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wei Yang <richard.weiyang@...il.com>
Subject: [PATCH 1/2] cgroup: rstat: explicitly put loop variant in while

Instead of do while unconditionally, let's put the loop variant in
while.

Signed-off-by: Wei Yang <richard.weiyang@...il.com>
---
 kernel/cgroup/rstat.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/cgroup/rstat.c b/kernel/cgroup/rstat.c
index 1486768f2318..a9d344e0521d 100644
--- a/kernel/cgroup/rstat.c
+++ b/kernel/cgroup/rstat.c
@@ -124,12 +124,10 @@ static struct cgroup *cgroup_rstat_cpu_pop_updated(struct cgroup *pos,
 
 			prstatc = cgroup_rstat_cpu(parent, cpu);
 			nextp = &prstatc->updated_children;
-			while (true) {
+			while (*nextp != pos) {
 				struct cgroup_rstat_cpu *nrstatc;
 
 				nrstatc = cgroup_rstat_cpu(*nextp, cpu);
-				if (*nextp == pos)
-					break;
 				WARN_ON_ONCE(*nextp == parent);
 				nextp = &nrstatc->updated_next;
 			}
-- 
2.33.1