linux-kernel - Re: [PATCH v3 6/7] mm: Remove can_modify

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Message-ID: <fkg5t5etq756jjpxqpedlud6tkbvxtevfzledwxog6tbmhu7wz@wb3mtvjglpdj>
Date: Mon, 19 Aug 2024 16:32:38 -0400
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: Pedro Falcato <pedro.falcato@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
        Shuah Khan <shuah@...nel.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        jeffxu@...omium.org, oliver.sang@...el.com,
        torvalds@...ux-foundation.org, Michael Ellerman <mpe@...erman.id.au>,
        Kees Cook <kees@...nel.org>
Subject: Re: [PATCH v3 6/7] mm: Remove can_modify_mm()

* Pedro Falcato <pedro.falcato@...il.com> [240816 20:18]:
> With no more users in the tree, we can finally remove can_modify_mm().
> 
> Signed-off-by: Pedro Falcato <pedro.falcato@...il.com>

Reviewed-by: Liam R. Howlett <Liam.Howlett@...cle.com>

> ---
>  mm/internal.h | 14 --------------
>  mm/mseal.c    | 21 ---------------------
>  2 files changed, 35 deletions(-)
> 
> diff --git a/mm/internal.h b/mm/internal.h
> index 1db320650539..3b738b0ad893 100644
> --- a/mm/internal.h
> +++ b/mm/internal.h
> @@ -1361,25 +1361,11 @@ static inline int can_do_mseal(unsigned long flags)
>  	return 0;
>  }
>  
> -bool can_modify_mm(struct mm_struct *mm, unsigned long start,
> -		unsigned long end);
>  #else
>  static inline int can_do_mseal(unsigned long flags)
>  {
>  	return -EPERM;
>  }
> -
> -static inline bool can_modify_mm(struct mm_struct *mm, unsigned long start,
> -		unsigned long end)
> -{
> -	return true;
> -}
> -
> -static inline bool can_modify_mm_madv(struct mm_struct *mm, unsigned long start,
> -		unsigned long end, int behavior)
> -{
> -	return true;
> -}
>  #endif
>  
>  #ifdef CONFIG_SHRINKER_DEBUG
> diff --git a/mm/mseal.c b/mm/mseal.c
> index fdd1666344fa..28cd17d7aaf2 100644
> --- a/mm/mseal.c
> +++ b/mm/mseal.c
> @@ -53,27 +53,6 @@ static bool is_ro_anon(struct vm_area_struct *vma)
>  	return false;
>  }
>  
> -/*
> - * Check if the vmas of a memory range are allowed to be modified.
> - * the memory ranger can have a gap (unallocated memory).
> - * return true, if it is allowed.
> - */
> -bool can_modify_mm(struct mm_struct *mm, unsigned long start, unsigned long end)
> -{
> -	struct vm_area_struct *vma;
> -
> -	VMA_ITERATOR(vmi, mm, start);
> -
> -	/* going through each vma to check. */
> -	for_each_vma_range(vmi, vma, end) {
> -		if (unlikely(!can_modify_vma(vma)))
> -			return false;
> -	}
> -
> -	/* Allow by default. */
> -	return true;
> -}
> -
>  /*
>   * Check if a vma is allowed to be modified by madvise.
>   */
> 
> -- 
> 2.46.0
>