linux-kernel - Re: [PATCH 3/4] mm/memory: convert do_shared

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Date:   Mon, 3 Jul 2023 17:29:43 +0800
From:   "zhangpeng (AS)" <zhangpeng362@...wei.com>
To:     Sidhartha Kumar <sidhartha.kumar@...cle.com>,
        <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
CC:     <akpm@...ux-foundation.org>, <willy@...radead.org>
Subject: Re: [PATCH 3/4] mm/memory: convert do_shared_fault() to folios

On 2023/7/3 13:58, Sidhartha Kumar wrote:

> Saves three implicit calls to compound_head().
>
> Signed-off-by: Sidhartha Kumar <sidhartha.kumar@...cle.com>

Reviewed-by: ZhangPeng <zhangpeng362@...wei.com>

> ---
>   mm/memory.c | 9 +++++----
>   1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/mm/memory.c b/mm/memory.c
> index 93480e846ace6..33bf13431974c 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -4594,6 +4594,7 @@ static vm_fault_t do_shared_fault(struct vm_fault *vmf)
>   {
>   	struct vm_area_struct *vma = vmf->vma;
>   	vm_fault_t ret, tmp;
> +	struct folio *folio = page_folio(vmf->page);
>   
>   	ret = __do_fault(vmf);
>   	if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)))
> @@ -4604,11 +4605,11 @@ static vm_fault_t do_shared_fault(struct vm_fault *vmf)
>   	 * about to become writable
>   	 */
>   	if (vma->vm_ops->page_mkwrite) {
> -		unlock_page(vmf->page);
> +		folio_unlock(folio);
>   		tmp = do_page_mkwrite(vmf);
>   		if (unlikely(!tmp ||
>   				(tmp & (VM_FAULT_ERROR | VM_FAULT_NOPAGE)))) {
> -			put_page(vmf->page);
> +			folio_put(folio);
>   			return tmp;
>   		}
>   	}
> @@ -4616,8 +4617,8 @@ static vm_fault_t do_shared_fault(struct vm_fault *vmf)
>   	ret |= finish_fault(vmf);
>   	if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE |
>   					VM_FAULT_RETRY))) {
> -		unlock_page(vmf->page);
> -		put_page(vmf->page);
> +		folio_unlock(folio);
> +		folio_put(folio);
>   		return ret;
>   	}
>