linux-kernel - Re: [PATCH v6 05/18] x86/mm: Convert pte_next_pfn() to pte_advance

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Message-ID: <6ff877c4-dc97-4572-b45c-2384c1d40fba@redhat.com>
Date: Thu, 15 Feb 2024 11:43:01 +0100
From: David Hildenbrand <david@...hat.com>
To: Ryan Roberts <ryan.roberts@....com>,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 Ard Biesheuvel <ardb@...nel.org>, Marc Zyngier <maz@...nel.org>,
 James Morse <james.morse@....com>, Andrey Ryabinin <ryabinin.a.a@...il.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Matthew Wilcox <willy@...radead.org>, Mark Rutland <mark.rutland@....com>,
 Kefeng Wang <wangkefeng.wang@...wei.com>, John Hubbard
 <jhubbard@...dia.com>, Zi Yan <ziy@...dia.com>,
 Barry Song <21cnbao@...il.com>, Alistair Popple <apopple@...dia.com>,
 Yang Shi <shy828301@...il.com>, Thomas Gleixner <tglx@...utronix.de>,
 Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
 Dave Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com>
Cc: linux-arm-kernel@...ts.infradead.org, x86@...nel.org,
 linuxppc-dev@...ts.ozlabs.org, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 05/18] x86/mm: Convert pte_next_pfn() to
 pte_advance_pfn()

On 15.02.24 11:31, Ryan Roberts wrote:
> Core-mm needs to be able to advance the pfn by an arbitrary amount, so
> override the new pte_advance_pfn() API to do so.
> 
> Signed-off-by: Ryan Roberts <ryan.roberts@....com>
> ---
>   arch/x86/include/asm/pgtable.h | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
> index b50b2ef63672..69ed0ea0641b 100644
> --- a/arch/x86/include/asm/pgtable.h
> +++ b/arch/x86/include/asm/pgtable.h
> @@ -955,13 +955,13 @@ static inline int pte_same(pte_t a, pte_t b)
>   	return a.pte == b.pte;
>   }
>   
> -static inline pte_t pte_next_pfn(pte_t pte)
> +static inline pte_t pte_advance_pfn(pte_t pte, unsigned long nr)
>   {
>   	if (__pte_needs_invert(pte_val(pte)))
> -		return __pte(pte_val(pte) - (1UL << PFN_PTE_SHIFT));
> -	return __pte(pte_val(pte) + (1UL << PFN_PTE_SHIFT));
> +		return __pte(pte_val(pte) - (nr << PFN_PTE_SHIFT));
> +	return __pte(pte_val(pte) + (nr << PFN_PTE_SHIFT));
>   }
> -#define pte_next_pfn	pte_next_pfn
> +#define pte_advance_pfn	pte_advance_pfn
>   
>   static inline int pte_present(pte_t a)
>   {

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

-- 
Cheers,

David / dhildenb