linux-kernel - Re: [patch -next] cpuset: remove dead code in cpuset-v1.c

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Message-ID: <2a829c98-9e6e-4c99-85c1-110a776db43e@redhat.com>
Date: Sun, 21 Dec 2025 23:10:36 -0500
From: Waiman Long <llong@...hat.com>
To: Chen Ridong <chenridong@...weicloud.com>, tj@...nel.org,
 hannes@...xchg.org, mkoutny@...e.com, chenridong@...wei.com
Cc: cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
 lujialin4@...wei.com, dan.carpenter@...aro.org
Subject: Re: [patch -next] cpuset: remove dead code in cpuset-v1.c

On 12/20/25 5:15 AM, Chen Ridong wrote:
> From: Chen Ridong <chenridong@...wei.com>
>
> The commit 6e1d31ce495c ("cpuset: separate generate_sched_domains for v1
> and v2") introduced dead code that was originally added for cpuset-v2
> partition domain generation. Remove the redundant root_load_balance check.
>
> Fixes: 6e1d31ce495c ("cpuset: separate generate_sched_domains for v1 and v2")
> Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
> Closes: https://lore.kernel.org/cgroups/9a442808-ed53-4657-988b-882cc0014c0d@huaweicloud.com/T/
> Signed-off-by: Chen Ridong <chenridong@...wei.com>
> ---
>   kernel/cgroup/cpuset-v1.c | 5 +----
>   1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/kernel/cgroup/cpuset-v1.c b/kernel/cgroup/cpuset-v1.c
> index 7303315fdba7..ecfea7800f0d 100644
> --- a/kernel/cgroup/cpuset-v1.c
> +++ b/kernel/cgroup/cpuset-v1.c
> @@ -605,7 +605,6 @@ int cpuset1_generate_sched_domains(cpumask_var_t **domains,
>   	int ndoms = 0;		/* number of sched domains in result */
>   	int nslot;		/* next empty doms[] struct cpumask slot */
>   	struct cgroup_subsys_state *pos_css;
> -	bool root_load_balance = is_sched_load_balance(&top_cpuset);
>   	int nslot_update;
>   
>   	lockdep_assert_cpuset_lock_held();
> @@ -615,7 +614,7 @@ int cpuset1_generate_sched_domains(cpumask_var_t **domains,
>   	csa = NULL;
>   
>   	/* Special case for the 99% of systems with one, full, sched domain */
> -	if (root_load_balance) {
> +	if (is_sched_load_balance(&top_cpuset)) {
>   		ndoms = 1;
>   		doms = alloc_sched_domains(ndoms);
>   		if (!doms)
> @@ -638,8 +637,6 @@ int cpuset1_generate_sched_domains(cpumask_var_t **domains,
>   	csn = 0;
>   
>   	rcu_read_lock();
> -	if (root_load_balance)
> -		csa[csn++] = &top_cpuset;
>   	cpuset_for_each_descendant_pre(cp, pos_css, &top_cpuset) {
>   		if (cp == &top_cpuset)
>   			continue;
Reviewed-by: Waiman Long <longman@...hat.com>