linux-kernel - Re: [PATCH v4 5/6] mm: convert copy_user_huge_page() to copy_user

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Message-ID: <ZCXRzfUKZUgPiscf@casper.infradead.org>
Date:   Thu, 30 Mar 2023 19:15:41 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Peng Zhang <zhangpeng362@...wei.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        akpm@...ux-foundation.org, mike.kravetz@...cle.com,
        vishal.moola@...il.com, muchun.song@...ux.dev,
        sidhartha.kumar@...cle.com, wangkefeng.wang@...wei.com,
        sunnanyong@...wei.com
Subject: Re: [PATCH v4 5/6] mm: convert copy_user_huge_page() to
 copy_user_folio()

On Thu, Mar 30, 2023 at 09:40:44PM +0800, Peng Zhang wrote:
> +void copy_user_folio(struct folio *dst, struct folio *src,
> +		      unsigned long addr_hint,
> +		      struct vm_area_struct *vma,
> +		      unsigned int pages_per_huge_page);

Do we really want to pass in pages_per_huge_page here?  We can get
that from folio_nr_pages(dst).

> +++ b/mm/hugetlb.c
> @@ -5097,8 +5097,8 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
>  					ret = PTR_ERR(new_folio);
>  					break;
>  				}
> -				copy_user_huge_page(&new_folio->page, ptepage, addr, dst_vma,
> -						    npages);
> +				copy_user_folio(new_folio, page_folio(ptepage), addr, dst_vma,
> +						npages);
>  				put_page(ptepage);

This function should be converted to s/ptepage/pte_folio/, but that's
not for this patch series.

> -	copy_user_huge_page(&new_folio->page, old_page, address, vma,
> -			    pages_per_huge_page(h));
> +	copy_user_folio(new_folio, page_folio(old_page), address, vma,
> +			pages_per_huge_page(h));

Likewise for s/old_page/old_folio/