linux-kernel - Re: [PATCH v6 03/18] mm: Introduce pte_advance_pfn() and use for pte_next

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Date: Thu, 15 Feb 2024 11:40:49 +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 03/18] mm: Introduce pte_advance_pfn() and use for
 pte_next_pfn()

On 15.02.24 11:31, Ryan Roberts wrote:
> The goal is to be able to advance a PTE by an arbitrary number of PFNs.
> So introduce a new API that takes a nr param. Define the default
> implementation here and allow for architectures to override.
> pte_next_pfn() becomes a wrapper around pte_advance_pfn().
> 
> Follow up commits will convert each overriding architecture's
> pte_next_pfn() to pte_advance_pfn().
> 
> Signed-off-by: Ryan Roberts <ryan.roberts@....com>
> ---
>   include/linux/pgtable.h | 9 ++++++---
>   1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
> index 231370e1b80f..b7ac8358f2aa 100644
> --- a/include/linux/pgtable.h
> +++ b/include/linux/pgtable.h
> @@ -212,14 +212,17 @@ static inline int pmd_dirty(pmd_t pmd)
>   #define arch_flush_lazy_mmu_mode()	do {} while (0)
>   #endif
>   
> -
>   #ifndef pte_next_pfn
> -static inline pte_t pte_next_pfn(pte_t pte)
> +#ifndef pte_advance_pfn
> +static inline pte_t pte_advance_pfn(pte_t pte, unsigned long nr)
>   {
> -	return __pte(pte_val(pte) + (1UL << PFN_PTE_SHIFT));
> +	return __pte(pte_val(pte) + (nr << PFN_PTE_SHIFT));
>   }
>   #endif
>   
> +#define pte_next_pfn(pte) pte_advance_pfn(pte, 1)
> +#endif
> +
>   #ifndef set_ptes
>   /**
>    * set_ptes - Map consecutive pages to a contiguous range of addresses.

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

-- 
Cheers,

David / dhildenb