linux-kernel - Re: [PATCH v3 04/10] mm/x86: Replace pgd_large() with pgd

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Date: Wed, 6 Mar 2024 08:23:50 +0200
From: Mike Rapoport <rppt@...nel.org>
To: peterx@...hat.com
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Christophe Leroy <christophe.leroy@...roup.eu>, 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, Muchun Song <muchun.song@...ux.dev>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH v3 04/10] mm/x86: Replace pgd_large() with pgd_leaf()

On Tue, Mar 05, 2024 at 12:37:44PM +0800, peterx@...hat.com wrote:
> From: Peter Xu <peterx@...hat.com>
> 
> pgd_leaf() is a global API while pgd_large() is not.  Always use
> the global pgd_leaf(), then drop pgd_large().
> 
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: x86@...nel.org
> Signed-off-by: Peter Xu <peterx@...hat.com>

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

> ---
>  arch/x86/include/asm/pgtable.h | 4 ++--
>  arch/x86/mm/pti.c              | 2 +-
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
> index 69ed0ea0641b..d6e993a5659f 100644
> --- a/arch/x86/include/asm/pgtable.h
> +++ b/arch/x86/include/asm/pgtable.h
> @@ -1418,8 +1418,8 @@ static inline bool pgdp_maps_userspace(void *__ptr)
>  	return (((ptr & ~PAGE_MASK) / sizeof(pgd_t)) < PGD_KERNEL_START);
>  }
>  
> -#define pgd_leaf	pgd_large
> -static inline int pgd_large(pgd_t pgd) { return 0; }
> +#define pgd_leaf	pgd_leaf
> +static inline int pgd_leaf(pgd_t pgd) { return 0; }
>  
>  #ifdef CONFIG_PAGE_TABLE_ISOLATION
>  /*
> diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c
> index dc0a81f5f60e..c17aab24c1b3 100644
> --- a/arch/x86/mm/pti.c
> +++ b/arch/x86/mm/pti.c
> @@ -185,7 +185,7 @@ static p4d_t *pti_user_pagetable_walk_p4d(unsigned long address)
>  
>  		set_pgd(pgd, __pgd(_KERNPG_TABLE | __pa(new_p4d_page)));
>  	}
> -	BUILD_BUG_ON(pgd_large(*pgd) != 0);
> +	BUILD_BUG_ON(pgd_leaf(*pgd) != 0);
>  
>  	return p4d_offset(pgd, address);
>  }
> -- 
> 2.44.0
> 
> 

-- 
Sincerely yours,
Mike.