linux-kernel - [PATCH 1/4] cgroup: a u16 is enough for cgroup_subsys.depends

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Message-Id: <20211004084928.17622-1-richard.weiyang@gmail.com>
Date:   Mon,  4 Oct 2021 08:49:25 +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 1/4] cgroup: a u16 is enough for cgroup_subsys.depends_on

After commit 6e5c830770f9 ("cgroup: make cgroup subsystem masks u16"),
we limit the number of subsystem to be less then 16. This applies to
cgroup_subsys.depends_on too.

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

diff --git a/include/linux/cgroup-defs.h b/include/linux/cgroup-defs.h
index db2e147e069f..f6d80896daab 100644
--- a/include/linux/cgroup-defs.h
+++ b/include/linux/cgroup-defs.h
@@ -705,7 +705,7 @@ struct cgroup_subsys {
 	 * not visible to userland until explicitly enabled.  The following
 	 * specifies the mask of subsystems that this one depends on.
 	 */
-	unsigned int depends_on;
+	u16 depends_on;
 };
 
 extern struct percpu_rw_semaphore cgroup_threadgroup_rwsem;
-- 
2.23.0