linux-kernel - Re: [PATCH 04/10] mm: convert arch-specific code to mm_flags

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Message-ID: <aJ2eu1qv1KkUsSbL@kernel.org>
Date: Thu, 14 Aug 2025 11:30:51 +0300
From: Mike Rapoport <rppt@...nel.org>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
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Subject: Re: [PATCH 04/10] mm: convert arch-specific code to mm_flags_*()
 accessors

On Tue, Aug 12, 2025 at 04:44:13PM +0100, Lorenzo Stoakes wrote:
> As part of the effort to move to mm->flags becoming a bitmap field, convert
> existing users to making use of the mm_flags_*() accessors which will, when
> the conversion is complete, be the only means of accessing mm_struct flags.
> 
> No functional change intended.
> 
> Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>

Reviewed-by: Mike Rapoport (Microsoft) <rppt@...nel.org>

> ---
>  arch/s390/mm/mmap.c              | 4 ++--
>  arch/sparc/kernel/sys_sparc_64.c | 4 ++--
>  arch/x86/mm/mmap.c               | 4 ++--
>  3 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
> index 40a526d28184..c884b580eb5e 100644
> --- a/arch/s390/mm/mmap.c
> +++ b/arch/s390/mm/mmap.c
> @@ -182,10 +182,10 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
>  	 */
>  	if (mmap_is_legacy(rlim_stack)) {
>  		mm->mmap_base = mmap_base_legacy(random_factor);
> -		clear_bit(MMF_TOPDOWN, &mm->flags);
> +		mm_flags_clear(MMF_TOPDOWN, mm);
>  	} else {
>  		mm->mmap_base = mmap_base(random_factor, rlim_stack);
> -		set_bit(MMF_TOPDOWN, &mm->flags);
> +		mm_flag_set(MMF_TOPDOWN, mm);
>  	}
>  }
>  
> diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c
> index c5a284df7b41..785e9909340f 100644
> --- a/arch/sparc/kernel/sys_sparc_64.c
> +++ b/arch/sparc/kernel/sys_sparc_64.c
> @@ -309,7 +309,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
>  	    gap == RLIM_INFINITY ||
>  	    sysctl_legacy_va_layout) {
>  		mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
> -		clear_bit(MMF_TOPDOWN, &mm->flags);
> +		mm_flags_clear(MMF_TOPDOWN, mm);
>  	} else {
>  		/* We know it's 32-bit */
>  		unsigned long task_size = STACK_TOP32;
> @@ -320,7 +320,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
>  			gap = (task_size / 6 * 5);
>  
>  		mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
> -		set_bit(MMF_TOPDOWN, &mm->flags);
> +		mm_flags_set(MMF_TOPDOWN, mm);
>  	}
>  }
>  
> diff --git a/arch/x86/mm/mmap.c b/arch/x86/mm/mmap.c
> index 5ed2109211da..708f85dc9380 100644
> --- a/arch/x86/mm/mmap.c
> +++ b/arch/x86/mm/mmap.c
> @@ -122,9 +122,9 @@ static void arch_pick_mmap_base(unsigned long *base, unsigned long *legacy_base,
>  void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
>  {
>  	if (mmap_is_legacy())
> -		clear_bit(MMF_TOPDOWN, &mm->flags);
> +		mm_flags_clear(MMF_TOPDOWN, mm);
>  	else
> -		set_bit(MMF_TOPDOWN, &mm->flags);
> +		mm_flags_set(MMF_TOPDOWN, mm);
>  
>  	arch_pick_mmap_base(&mm->mmap_base, &mm->mmap_legacy_base,
>  			arch_rnd(mmap64_rnd_bits), task_size_64bit(0),
> -- 
> 2.50.1
> 

-- 
Sincerely yours,
Mike.