linux-kernel - Re: [PATCH 11/13] mm/treewide: Replace pXd_huge() with pXd

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Date: Thu, 14 Mar 2024 08:50:20 +0000
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: "peterx@...hat.com" <peterx@...hat.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>
CC: "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, Matthew Wilcox <willy@...radead.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>, Andrew
 Morton <akpm@...ux-foundation.org>, "x86@...nel.org" <x86@...nel.org>, Mike
 Rapoport <rppt@...nel.org>, Muchun Song <muchun.song@...ux.dev>,
	"sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>, Jason Gunthorpe
	<jgg@...dia.com>
Subject: Re: [PATCH 11/13] mm/treewide: Replace pXd_huge() with pXd_leaf()



Le 13/03/2024 à 22:47, peterx@...hat.com a écrit :
> From: Peter Xu <peterx@...hat.com>
> 
> Now after we're sure all pXd_huge() definitions are the same as pXd_leaf(),
> reuse it.  Luckily, pXd_huge() isn't widely used.
> 
> Signed-off-by: Peter Xu <peterx@...hat.com>
> ---
>   arch/arm/include/asm/pgtable-3level.h | 2 +-
>   arch/arm64/include/asm/pgtable.h      | 2 +-
>   arch/arm64/mm/hugetlbpage.c           | 4 ++--
>   arch/loongarch/mm/hugetlbpage.c       | 2 +-
>   arch/mips/mm/tlb-r4k.c                | 2 +-
>   arch/powerpc/mm/pgtable_64.c          | 6 +++---
>   arch/x86/mm/pgtable.c                 | 4 ++--
>   mm/gup.c                              | 4 ++--
>   mm/hmm.c                              | 2 +-
>   mm/memory.c                           | 2 +-
>   10 files changed, 15 insertions(+), 15 deletions(-)
> 
> diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h
> index e7aecbef75c9..9e3c44f0aea2 100644
> --- a/arch/arm/include/asm/pgtable-3level.h
> +++ b/arch/arm/include/asm/pgtable-3level.h
> @@ -190,7 +190,7 @@ static inline pte_t pte_mkspecial(pte_t pte)
>   #define pmd_dirty(pmd)		(pmd_isset((pmd), L_PMD_SECT_DIRTY))
>   
>   #define pmd_hugewillfault(pmd)	(!pmd_young(pmd) || !pmd_write(pmd))
> -#define pmd_thp_or_huge(pmd)	(pmd_huge(pmd) || pmd_trans_huge(pmd))
> +#define pmd_thp_or_huge(pmd)	(pmd_leaf(pmd) || pmd_trans_huge(pmd))

Previous patch said pmd_trans_huge() implies pmd_leaf().

Or is that only for GUP ?

>   
>   #ifdef CONFIG_TRANSPARENT_HUGEPAGE
>   #define pmd_trans_huge(pmd)	(pmd_val(pmd) && !pmd_table(pmd))


> diff --git a/mm/hmm.c b/mm/hmm.c
> index c95b9ec5d95f..93aebd9cc130 100644
> --- a/mm/hmm.c
> +++ b/mm/hmm.c
> @@ -429,7 +429,7 @@ static int hmm_vma_walk_pud(pud_t *pudp, unsigned long start, unsigned long end,
>   		return hmm_vma_walk_hole(start, end, -1, walk);
>   	}
>   
> -	if (pud_huge(pud) && pud_devmap(pud)) {
> +	if (pud_leaf(pud) && pud_devmap(pud)) {

Didn't previous patch say devmap implies leaf ? Or is it only for GUP ?

>   		unsigned long i, npages, pfn;
>   		unsigned int required_fault;
>   		unsigned long *hmm_pfns;