linux-kernel - [PATCH 1/2] cgroup: cgroup

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Message-Id: <20211127145919.31159-1-richard.weiyang@gmail.com>
Date:   Sat, 27 Nov 2021 14:59:18 +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: cgroup_subsys[ssid] is never NULL

When the check, (ssid) < CGROUP_SUBSYS_COUNT, passed, it means
cgroup_subsys[ssid] is defined to its proper value. It is not
necessary to use a true to enter the loop.

Signed-off-by: Wei Yang <richard.weiyang@...il.com>
---
 kernel/cgroup/cgroup-internal.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/cgroup/cgroup-internal.h b/kernel/cgroup/cgroup-internal.h
index bfbeabc17a9d..0c5d1df6cdef 100644
--- a/kernel/cgroup/cgroup-internal.h
+++ b/kernel/cgroup/cgroup-internal.h
@@ -163,7 +163,7 @@ extern struct file_system_type cgroup_fs_type;
  */
 #define for_each_subsys(ss, ssid)					\
 	for ((ssid) = 0; (ssid) < CGROUP_SUBSYS_COUNT &&		\
-	     (((ss) = cgroup_subsys[ssid]) || true); (ssid)++)
+	     ((ss) = cgroup_subsys[ssid]); (ssid)++)
 
 static inline bool cgroup_is_dead(const struct cgroup *cgrp)
 {
-- 
2.33.1