linux-kernel - [PATCH v2] cgroup: use legacy_name for cgroup v1 disable info

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Date:   Fri,  6 Oct 2023 17:20:32 +0530
From:   Kamalesh Babulal <kamalesh.babulal@...cle.com>
To:     Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>
Cc:     Tom Hromatka <tom.hromatka@...cle.com>, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] cgroup: use legacy_name for cgroup v1 disable info

cgroup v1 or v2 or both controller names can be passed as arguments to
the 'cgroup_no_v1' kernel parameter, though most of the controller's
names are the same for both cgroup versions. This can be confusing when
both versions are used interchangeably, i.e., passing cgroup_no_v1=io

$ sudo dmesg |grep cgroup
...
cgroup: Disabling io control group subsystem in v1 mounts
cgroup: Disabled controller 'blkio'

Make it consistent across the pr_info()'s, by using ss->legacy_name, as
the subsystem name, while printing the cgroup v1 controller disabling
information in cgroup_init().

Signed-off-by: Kamalesh Babulal <kamalesh.babulal@...cle.com>
---
v2 changes:
- Dropped the subsys name comparison with ss->legacy_name only while
  parsing cgroup_no_v1 cmdline
- Adapt the commit subject to match the partial change

 kernel/cgroup/cgroup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 1fb7f562289d..622fb53a806b 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -6121,7 +6121,7 @@ int __init cgroup_init(void)

 		if (cgroup1_ssid_disabled(ssid))
 			pr_info("Disabling %s control group subsystem in v1 mounts\n",
-				ss->name);
+				ss->legacy_name);

 		cgrp_dfl_root.subsys_mask |= 1 << ss->id;

base-commit: b78b18fb8ee19f7a05f20c3abc865b3bfe182884
-- 
2.41.0