linux-kernel - Re: [PATCH v3 01/10] mm/ppc: Define pXd_large() with pXd

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Message-ID: <a4bcf0b2-bdc1-4832-8d29-1203b5f25d82@csgroup.eu>
Date: Tue, 5 Mar 2024 17:29:45 +0000
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: "peterx@...hat.com" <peterx@...hat.com>, "linux-mm@...ck.org"
	<linux-mm@...ck.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
CC: "x86@...nel.org" <x86@...nel.org>, "Kirill A . Shutemov"
	<kirill@...temov.name>, Jason Gunthorpe <jgg@...dia.com>, Yang Shi
	<shy828301@...il.com>, Andrew Morton <akpm@...ux-foundation.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>, Muchun Song
	<muchun.song@...ux.dev>, Michael Ellerman <mpe@...erman.id.au>, Nicholas
 Piggin <npiggin@...il.com>, Aneesh Kumar K.V <aneesh.kumar@...nel.org>,
	"Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>
Subject: Re: [PATCH v3 01/10] mm/ppc: Define pXd_large() with pXd_leaf()



Le 05/03/2024 à 05:37, peterx@...hat.com a écrit :
> From: Peter Xu <peterx@...hat.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@...erman.id.au>
> Cc: Nicholas Piggin <npiggin@...il.com>
> Cc: Christophe Leroy <christophe.leroy@...roup.eu>
> Cc: "Aneesh Kumar K.V" <aneesh.kumar@...nel.org>
> Cc: "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>
> Cc: linuxppc-dev@...ts.ozlabs.org
> Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
> Signed-off-by: Peter Xu <peterx@...hat.com>

Reviewed-by: Christophe Leroy <christophe.leroy@...roup.eu>

> ---
>   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
>