linux-kernel - Re: [PATCH] cgroup: remove unneeded return value of cgroup_rm_cftypes

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Date:   Tue, 11 Jul 2023 10:58:48 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     Michal Koutný <mkoutny@...e.com>
CC:     <tj@...nel.org>, <hannes@...xchg.org>, <lizefan.x@...edance.com>,
        <cgroups@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cgroup: remove unneeded return value of
 cgroup_rm_cftypes_locked()

On 2023/7/10 23:46, Michal Koutný wrote:
> Hi.
> 
> On Sat, Jul 01, 2023 at 03:38:56PM +0800, Miaohe Lin <linmiaohe@...wei.com> wrote:
>> The return value of cgroup_rm_cftypes_locked() is always 0. So remove
>> it to simplify the code. No functional change intended.
> 
> I'd add a comment that it builds upon cgroup_addrm_files()'s:

Do you mean something like below:

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index b0d98542eea2..2c02f319a7d4 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -4320,6 +4320,7 @@ static int cgroup_init_cftypes(struct cgroup_subsys *ss, struct cftype *cfts)
        return ret;
 }

+/* It builds upon cgroup_addrm_files()'s. */
 static void cgroup_rm_cftypes_locked(struct cftype *cfts)
 {
        lockdep_assert_held(&cgroup_mutex);


>> For removals, this function never fails.
> 
>> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
>> ---
>>  kernel/cgroup/cgroup.c | 9 +++------
>>  1 file changed, 3 insertions(+), 6 deletions(-)
> 
> Reviewed-by: Michal Koutný <mkoutny@...e.com>

Thanks for review and suggestion.