linux-kernel - Re: [PATCH v2 10/10] s390/hugetlb: convert PG_arch

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Message-ID: <20240507183307.3336dabc@p-imbrenda.boeblingen.de.ibm.com>
Date: Tue, 7 May 2024 18:33:07 +0200
From: Claudio Imbrenda <imbrenda@...ux.ibm.com>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-s390@...r.kernel.org, Heiko Carstens <hca@...ux.ibm.com>,
        Vasily
 Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle
 <svens@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Gerald
 Schaefer <gerald.schaefer@...ux.ibm.com>,
        Matthew Wilcox
 <willy@...radead.org>, Thomas Huth <thuth@...hat.com>
Subject: Re: [PATCH v2 10/10] s390/hugetlb: convert PG_arch_1 code to work
 on folio->flags

On Fri, 12 Apr 2024 16:21:20 +0200
David Hildenbrand <david@...hat.com> wrote:

> Let's make it clearer that we are always working on folio flags and
> never page flags of tail pages.

please be a little more verbose, and explain what you are doing (i.e.
converting usages of page flags to folio flags), not just why.

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

with a few extra words in the description:

Reviewed-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>

> ---
>  arch/s390/mm/gmap.c        | 4 ++--
>  arch/s390/mm/hugetlbpage.c | 8 ++++----
>  2 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c
> index 0351cb139df4..9eea05cd93b7 100644
> --- a/arch/s390/mm/gmap.c
> +++ b/arch/s390/mm/gmap.c
> @@ -2648,7 +2648,7 @@ static int __s390_enable_skey_hugetlb(pte_t *pte, unsigned long addr,
>  {
>  	pmd_t *pmd = (pmd_t *)pte;
>  	unsigned long start, end;
> -	struct page *page = pmd_page(*pmd);
> +	struct folio *folio = page_folio(pmd_page(*pmd));
>  
>  	/*
>  	 * The write check makes sure we do not set a key on shared
> @@ -2663,7 +2663,7 @@ static int __s390_enable_skey_hugetlb(pte_t *pte, unsigned long addr,
>  	start = pmd_val(*pmd) & HPAGE_MASK;
>  	end = start + HPAGE_SIZE - 1;
>  	__storage_key_init_range(start, end);
> -	set_bit(PG_arch_1, &page->flags);
> +	set_bit(PG_arch_1, &folio->flags);
>  	cond_resched();
>  	return 0;
>  }
> diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c
> index c2e8242bd15d..a32047315f9a 100644
> --- a/arch/s390/mm/hugetlbpage.c
> +++ b/arch/s390/mm/hugetlbpage.c
> @@ -121,7 +121,7 @@ static inline pte_t __rste_to_pte(unsigned long rste)
>  
>  static void clear_huge_pte_skeys(struct mm_struct *mm, unsigned long rste)
>  {
> -	struct page *page;
> +	struct folio *folio;
>  	unsigned long size, paddr;
>  
>  	if (!mm_uses_skeys(mm) ||
> @@ -129,16 +129,16 @@ static void clear_huge_pte_skeys(struct mm_struct *mm, unsigned long rste)
>  		return;
>  
>  	if ((rste & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) {
> -		page = pud_page(__pud(rste));
> +		folio = page_folio(pud_page(__pud(rste)));
>  		size = PUD_SIZE;
>  		paddr = rste & PUD_MASK;
>  	} else {
> -		page = pmd_page(__pmd(rste));
> +		folio = page_folio(pmd_page(__pmd(rste)));
>  		size = PMD_SIZE;
>  		paddr = rste & PMD_MASK;
>  	}
>  
> -	if (!test_and_set_bit(PG_arch_1, &page->flags))
> +	if (!test_and_set_bit(PG_arch_1, &folio->flags))
>  		__storage_key_init_range(paddr, paddr + size - 1);
>  }
>