linux-kernel - Re: [PATCH v5 05/12] mm: constify process_shares

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Message-ID: <7bc9e9c5-369e-4049-a4b2-e3a0a3d9b58c@lucifer.local>
Date: Mon, 1 Sep 2025 15:46:01 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Max Kellermann <max.kellermann@...os.com>
Cc: akpm@...ux-foundation.org, david@...hat.com, axelrasmussen@...gle.com,
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Subject: Re: [PATCH v5 05/12] mm: constify process_shares_mm() for improved
 const-correctness

On Mon, Sep 01, 2025 at 02:30:21PM +0200, Max Kellermann wrote:
> This function only reads from the pointer arguments.
>
> Local (loop) variables are also annotated with `const` to clarify that
> these will not be written to.
>
> Signed-off-by: Max Kellermann <max.kellermann@...os.com>

This is nice thanks,

Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>

> ---
>  include/linux/mm.h | 2 +-
>  mm/oom_kill.c      | 7 ++++---
>  2 files changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 18deb14cb1f5..f70c6b4d5f80 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -3840,7 +3840,7 @@ static inline int in_gate_area(struct mm_struct *mm, unsigned long addr)
>  }
>  #endif	/* __HAVE_ARCH_GATE_AREA */
>
> -extern bool process_shares_mm(struct task_struct *p, struct mm_struct *mm);
> +bool process_shares_mm(const struct task_struct *p, const struct mm_struct *mm);
>
>  void drop_slab(void);
>
> diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> index 17650f0b516e..6a888a5de2a4 100644
> --- a/mm/oom_kill.c
> +++ b/mm/oom_kill.c
> @@ -490,12 +490,13 @@ static bool oom_killer_disabled __read_mostly;
>   * task's threads: if one of those is using this mm then this task was also
>   * using it.
>   */
> -bool process_shares_mm(struct task_struct *p, struct mm_struct *mm)
> +bool process_shares_mm(const struct task_struct *const p,
> +		       const struct mm_struct *const mm)
>  {
> -	struct task_struct *t;
> +	const struct task_struct *t;
>
>  	for_each_thread(p, t) {
> -		struct mm_struct *t_mm = READ_ONCE(t->mm);
> +		const struct mm_struct *t_mm = READ_ONCE(t->mm);
>  		if (t_mm)
>  			return t_mm == mm;
>  	}
> --
> 2.47.2
>