linux-kernel - Re: [PATCH 1/4] mm: Add optional close() to struct vm_special

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Message-ID: <1b0e07fb-33fb-4397-b03e-65698601bc70@redhat.com>
Date: Wed, 7 Aug 2024 17:32:12 +0200
From: David Hildenbrand <david@...hat.com>
To: Michael Ellerman <mpe@...erman.id.au>, linux-mm@...ck.org
Cc: linuxppc-dev@...ts.ozlabs.org, torvalds@...ux-foundation.org,
 akpm@...ux-foundation.org, christophe.leroy@...roup.eu, jeffxu@...omium.org,
 jeffxu@...gle.com, Liam.Howlett@...cle.com, linux-kernel@...r.kernel.org,
 npiggin@...il.com, oliver.sang@...el.com, pedro.falcato@...il.com
Subject: Re: [PATCH 1/4] mm: Add optional close() to struct vm_special_mapping

On 07.08.24 14:41, Michael Ellerman wrote:
> Add an optional close() callback to struct vm_special_mapping. It will
> be used, by powerpc at least, to handle unmapping of the VDSO.
> 
> Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
> Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
> ---
>   include/linux/mm_types.h | 2 ++
>   mm/mmap.c                | 3 +++
>   2 files changed, 5 insertions(+)
> 
> diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
> index 485424979254..ef32d87a3adc 100644
> --- a/include/linux/mm_types.h
> +++ b/include/linux/mm_types.h
> @@ -1313,6 +1313,8 @@ struct vm_special_mapping {
>   
>   	int (*mremap)(const struct vm_special_mapping *sm,
>   		     struct vm_area_struct *new_vma);
> +	void (*close)(const struct vm_special_mapping *sm,
> +		      struct vm_area_struct *vma);
>   };
>   
>   enum tlb_flush_reason {
> diff --git a/mm/mmap.c b/mm/mmap.c
> index d0dfc85b209b..24bd6aa9155c 100644
> --- a/mm/mmap.c
> +++ b/mm/mmap.c
> @@ -3624,6 +3624,9 @@ static vm_fault_t special_mapping_fault(struct vm_fault *vmf);
>    */
>   static void special_mapping_close(struct vm_area_struct *vma)
>   {
> +	const struct vm_special_mapping *sm = vma->vm_private_data;

I'm old-fashioned, I enjoy an empty line here ;)

> +	if (sm->close)
> +		sm->close(sm, vma);

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Cheers,

David / dhildenb