linux-kernel - Re: [PATCH 08/19] mm: Always define pxx

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Message-ID: <20240814130915.GI2032816@nvidia.com>
Date: Wed, 14 Aug 2024 10:09:15 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Peter Xu <peterx@...hat.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Sean Christopherson <seanjc@...gle.com>,
	Oscar Salvador <osalvador@...e.de>,
	Axel Rasmussen <axelrasmussen@...gle.com>,
	linux-arm-kernel@...ts.infradead.org, x86@...nel.org,
	Will Deacon <will@...nel.org>, Gavin Shan <gshan@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>, Zi Yan <ziy@...dia.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Ingo Molnar <mingo@...hat.com>,
	Alistair Popple <apopple@...dia.com>,
	Borislav Petkov <bp@...en8.de>,
	David Hildenbrand <david@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>, kvm@...r.kernel.org,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Yan Zhao <yan.y.zhao@...el.com>
Subject: Re: [PATCH 08/19] mm: Always define pxx_pgprot()

On Fri, Aug 09, 2024 at 12:08:58PM -0400, Peter Xu wrote:
> There're:
> 
>   - 8 archs (arc, arm64, include, mips, powerpc, s390, sh, x86) that
>   support pte_pgprot().
> 
>   - 2 archs (x86, sparc) that support pmd_pgprot().
> 
>   - 1 arch (x86) that support pud_pgprot().
> 
> Always define them to be used in generic code, and then we don't need to
> fiddle with "#ifdef"s when doing so.
> 
> Signed-off-by: Peter Xu <peterx@...hat.com>
> ---
>  arch/arm64/include/asm/pgtable.h    |  1 +
>  arch/powerpc/include/asm/pgtable.h  |  1 +
>  arch/s390/include/asm/pgtable.h     |  1 +
>  arch/sparc/include/asm/pgtable_64.h |  1 +
>  include/linux/pgtable.h             | 12 ++++++++++++
>  5 files changed, 16 insertions(+)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

> diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
> index 7a4f5604be3f..b78cc4a6758b 100644
> --- a/arch/arm64/include/asm/pgtable.h
> +++ b/arch/arm64/include/asm/pgtable.h
> @@ -384,6 +384,7 @@ static inline void __sync_cache_and_tags(pte_t pte, unsigned int nr_pages)
>  /*
>   * Select all bits except the pfn
>   */
> +#define pte_pgprot pte_pgprot
>  static inline pgprot_t pte_pgprot(pte_t pte)
>  {
>  	unsigned long pfn = pte_pfn(pte);

Stylistically I've been putting the #defines after the function body,
I wonder if there is a common pattern..

Jason