linux-kernel - Re: [PATCH] mm: consolidate pgtable_cache_init() and pgd_cache

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Date:   Wed, 21 Aug 2019 20:36:14 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Mike Rapoport <rppt@...ux.ibm.com>
cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>, x86@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: consolidate pgtable_cache_init() and
 pgd_cache_init()

On Wed, 21 Aug 2019, Mike Rapoport wrote:
> diff --git a/arch/x86/include/asm/pgtable_32.h b/arch/x86/include/asm/pgtable_32.h
> index b9b9f8a..0dca7f7 100644
> --- a/arch/x86/include/asm/pgtable_32.h
> +++ b/arch/x86/include/asm/pgtable_32.h
> @@ -29,7 +29,6 @@ extern pgd_t swapper_pg_dir[1024];
>  extern pgd_t initial_page_table[1024];
>  extern pmd_t initial_pg_pmd[];
>  
> -static inline void pgtable_cache_init(void) { }
>  void paging_init(void);
>  void sync_initial_page_table(void);
>  
> diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h
> index a26d2d5..0b6c4042 100644
> --- a/arch/x86/include/asm/pgtable_64.h
> +++ b/arch/x86/include/asm/pgtable_64.h
> @@ -241,8 +241,6 @@ extern void cleanup_highmap(void);
>  #define HAVE_ARCH_UNMAPPED_AREA
>  #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
>  
> -#define pgtable_cache_init()   do { } while (0)
> -
>  #define PAGE_AGP    PAGE_KERNEL_NOCACHE
>  #define HAVE_PAGE_AGP 1
>  
> diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
> index 73757bc..3e4b903 100644
> --- a/arch/x86/mm/pgtable.c
> +++ b/arch/x86/mm/pgtable.c
> @@ -357,7 +357,7 @@ static void pgd_prepopulate_user_pmd(struct mm_struct *mm,
>  
>  static struct kmem_cache *pgd_cache;
>  
> -void __init pgd_cache_init(void)
> +void __init pgtable_cache_init(void)
>  {
>  	/*
>  	 * When PAE kernel is running as a Xen domain, it does not use
> @@ -402,10 +402,6 @@ static inline void _pgd_free(pgd_t *pgd)
>  }
>  #else
>  
> -void __init pgd_cache_init(void)
> -{
> -}

Acked-by: Thomas Gleixner <tglx@...utronix.de>