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Date: Wed, 6 Mar 2024 08:15:53 +0200
From: Mike Rapoport <rppt@kernel.org>
To: peterx@redhat.com
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Christophe Leroy <christophe.leroy@csgroup.eu>, x86@kernel.org,
	"Kirill A . Shutemov" <kirill@shutemov.name>,
	Jason Gunthorpe <jgg@nvidia.com>, Yang Shi <shy828301@gmail.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	linuxppc-dev@lists.ozlabs.org, Muchun Song <muchun.song@linux.dev>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Nicholas Piggin <npiggin@gmail.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@kernel.org>,
	"Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
Subject: Re: [PATCH v3 01/10] mm/ppc: Define pXd_large() with pXd_leaf()
Message-ID: <ZegKGU4kTV-icKKC@kernel.org>
References: <20240305043750.93762-1-peterx@redhat.com>
 <20240305043750.93762-2-peterx@redhat.com>
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In-Reply-To: <20240305043750.93762-2-peterx@redhat.com>

On Tue, Mar 05, 2024 at 12:37:41PM +0800, peterx@redhat.com wrote:
> From: Peter Xu <peterx@redhat.com>
> 
> The two definitions are the same.  The only difference is that pXd_large()
> is only defined with THP selected, and only on book3s 64bits.
> 
> Instead of implementing it twice, make pXd_large() a macro to pXd_leaf().
> Define it unconditionally just like pXd_leaf().  This helps to prepare
> merging the two APIs.
> 
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: Nicholas Piggin <npiggin@gmail.com>
> Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
> Cc: "Aneesh Kumar K.V" <aneesh.kumar@kernel.org>
> Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
> Cc: linuxppc-dev@lists.ozlabs.org
> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Peter Xu <peterx@redhat.com>

Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org>

> ---
>  arch/powerpc/include/asm/book3s/64/pgtable.h | 16 ++--------------
>  arch/powerpc/include/asm/pgtable.h           |  2 +-
>  2 files changed, 3 insertions(+), 15 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
> index 927d585652bc..d1318e8582ac 100644
> --- a/arch/powerpc/include/asm/book3s/64/pgtable.h
> +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
> @@ -1157,20 +1157,6 @@ pud_hugepage_update(struct mm_struct *mm, unsigned long addr, pud_t *pudp,
>  	return pud_val(*pudp);
>  }
>  
> -/*
> - * returns true for pmd migration entries, THP, devmap, hugetlb
> - * But compile time dependent on THP config
> - */
> -static inline int pmd_large(pmd_t pmd)
> -{
> -	return !!(pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE));
> -}
> -
> -static inline int pud_large(pud_t pud)
> -{
> -	return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PTE));
> -}
> -
>  /*
>   * For radix we should always find H_PAGE_HASHPTE zero. Hence
>   * the below will work for radix too
> @@ -1455,6 +1441,7 @@ static inline bool is_pte_rw_upgrade(unsigned long old_val, unsigned long new_va
>   */
>  #define pmd_is_leaf pmd_is_leaf
>  #define pmd_leaf pmd_is_leaf
> +#define pmd_large pmd_leaf
>  static inline bool pmd_is_leaf(pmd_t pmd)
>  {
>  	return !!(pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE));
> @@ -1462,6 +1449,7 @@ static inline bool pmd_is_leaf(pmd_t pmd)
>  
>  #define pud_is_leaf pud_is_leaf
>  #define pud_leaf pud_is_leaf
> +#define pud_large pud_leaf
>  static inline bool pud_is_leaf(pud_t pud)
>  {
>  	return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PTE));
> diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
> index 7a1ba8889aea..5928b3c1458d 100644
> --- a/arch/powerpc/include/asm/pgtable.h
> +++ b/arch/powerpc/include/asm/pgtable.h
> @@ -101,7 +101,7 @@ void poking_init(void);
>  extern unsigned long ioremap_bot;
>  extern const pgprot_t protection_map[16];
>  
> -#ifndef CONFIG_TRANSPARENT_HUGEPAGE
> +#ifndef pmd_large
>  #define pmd_large(pmd)		0
>  #endif
>  
> -- 
> 2.44.0
> 
> 

-- 
Sincerely yours,
Mike.