linux-kernel - Re: [PATCH v2 2/3] hugetlb: Convert hugetlb_no_page() to use struct vm

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Date: Thu, 4 Apr 2024 14:50:35 +0200
From: Oscar Salvador <osalvador@...e.de>
To: "Vishal Moola (Oracle)" <vishal.moola@...il.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, muchun.song@...ux.dev,
	willy@...radead.org
Subject: Re: [PATCH v2 2/3] hugetlb: Convert hugetlb_no_page() to use struct
 vm_fault

On Mon, Apr 01, 2024 at 01:26:50PM -0700, Vishal Moola (Oracle) wrote:
> hugetlb_no_page() can use the struct vm_fault passed in from
> hugetlb_fault(). This alleviates the stack by consolidating 7
> variables into a single struct.
> 
> Signed-off-by: Vishal Moola (Oracle) <vishal.moola@...il.com>
> ---
>  mm/hugetlb.c | 59 ++++++++++++++++++++++++++--------------------------
>  1 file changed, 29 insertions(+), 30 deletions(-)
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 360b82374a89..aca2f11b4138 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -6189,9 +6189,7 @@ static bool hugetlb_pte_stable(struct hstate *h, struct mm_struct *mm,
>  
>  static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
>  			struct vm_area_struct *vma,
> -			struct address_space *mapping, pgoff_t idx,
> -			unsigned long address, pte_t *ptep,
> -			pte_t old_pte, unsigned int flags,
> +			struct address_space *mapping,

AFAICS all this can be self-contained in vm_fault struct.
vmf->vma->mm and vmf->vma.
I mean, if we want to convert this interface, why not going all the way?

Looks a bit odd some fields yes while some others remain.

Or am I missing something?

-- 
Oscar Salvador
SUSE Labs