linux-kernel - Re: [PATCH] sched: Remove unused variable in mm_cid

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Message-ID: <d76040f3-40d2-4cc3-bf59-cdd9f6673ad2@arm.com>
Date: Mon, 20 Oct 2025 11:16:09 +0100
From: Christian Loehle <christian.loehle@....com>
To: Kevin Brodsky <kevin.brodsky@....com>, linux-kernel@...r.kernel.org,
 andriy.shevchenko@...ux.intel.com
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
 Juri Lelli <juri.lelli@...hat.com>
Subject: Re: [PATCH] sched: Remove unused variable in mm_cid_get()

On 10/17/25 08:30, Kevin Brodsky wrote:
> The cpumask variable in mm_cid_get() has never been used, remove it.
> 
> This fixes a -Wunused-but-set-variable warning when building with
> W=1.
> 
> Signed-off-by: Kevin Brodsky <kevin.brodsky@....com>
> ---
> Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Juri Lelli <juri.lelli@...hat.com>
> ---
>  kernel/sched/sched.h | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
> index 1f5d07067f60..361f9101cef9 100644
> --- a/kernel/sched/sched.h
> +++ b/kernel/sched/sched.h
> @@ -3740,11 +3740,9 @@ static inline int mm_cid_get(struct rq *rq, struct task_struct *t,
>  			     struct mm_struct *mm)
>  {
>  	struct mm_cid __percpu *pcpu_cid = mm->pcpu_cid;
> -	struct cpumask *cpumask;
>  	int cid;
>  
>  	lockdep_assert_rq_held(rq);
> -	cpumask = mm_cidmask(mm);
>  	cid = __this_cpu_read(pcpu_cid->cid);
>  	if (mm_cid_is_valid(cid)) {
>  		mm_cid_snapshot_time(rq, mm);
> 
> base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787

Andy also posted this:
https://lore.kernel.org/lkml/20251015091935.2977229-1-andriy.shevchenko@linux.intel.com/