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Subject: Re: [PATCH v4 11/11] hugetlb: Introduce generic version of
 huge_ptep_get
To:     Alexandre Ghiti <alex@ghiti.fr>, linux@armlinux.org.uk,
        catalin.marinas@arm.com, will.deacon@arm.com, tony.luck@intel.com,
        fenghua.yu@intel.com, ralf@linux-mips.org, paul.burton@mips.com,
        jhogan@kernel.org, jejb@parisc-linux.org, deller@gmx.de,
        benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au,
        ysato@users.sourceforge.jp, dalias@libc.org, davem@davemloft.net,
        tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com,
        x86@kernel.org, arnd@arndb.de,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-ia64@vger.kernel.org, linux-mips@linux-mips.org,
        linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        linux-sh@vger.kernel.org, sparclinux@vger.kernel.org,
        linux-arch@vger.kernel.org
References: <20180705110716.3919-1-alex@ghiti.fr>
 <20180705110716.3919-12-alex@ghiti.fr>
From:   Mike Kravetz <mike.kravetz@oracle.com>
Message-ID: <b309296d-ec88-a682-0a10-38a3408a51b7@oracle.com>
Date:   Thu, 26 Jul 2018 12:13:52 -0700
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On 07/05/2018 04:07 AM, Alexandre Ghiti wrote:
> ia64, mips, parisc, powerpc, sh, sparc, x86 architectures use the
> same version of huge_ptep_get, so move this generic implementation into
> asm-generic/hugetlb.h.
> 

Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
-- 
Mike Kravetz

> Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
> ---
>  arch/arm/include/asm/hugetlb-3level.h | 1 +
>  arch/arm64/include/asm/hugetlb.h      | 1 +
>  arch/ia64/include/asm/hugetlb.h       | 5 -----
>  arch/mips/include/asm/hugetlb.h       | 5 -----
>  arch/parisc/include/asm/hugetlb.h     | 5 -----
>  arch/powerpc/include/asm/hugetlb.h    | 5 -----
>  arch/sh/include/asm/hugetlb.h         | 5 -----
>  arch/sparc/include/asm/hugetlb.h      | 5 -----
>  arch/x86/include/asm/hugetlb.h        | 5 -----
>  include/asm-generic/hugetlb.h         | 7 +++++++
>  10 files changed, 9 insertions(+), 35 deletions(-)
> 
> diff --git a/arch/arm/include/asm/hugetlb-3level.h b/arch/arm/include/asm/hugetlb-3level.h
> index 54e4b097b1f5..0d9f3918fa7e 100644
> --- a/arch/arm/include/asm/hugetlb-3level.h
> +++ b/arch/arm/include/asm/hugetlb-3level.h
> @@ -29,6 +29,7 @@
>   * ptes.
>   * (The valid bit is automatically cleared by set_pte_at for PROT_NONE ptes).
>   */
> +#define __HAVE_ARCH_HUGE_PTEP_GET
>  static inline pte_t huge_ptep_get(pte_t *ptep)
>  {
>  	pte_t retval = *ptep;
> diff --git a/arch/arm64/include/asm/hugetlb.h b/arch/arm64/include/asm/hugetlb.h
> index 80887abcef7f..fb6609875455 100644
> --- a/arch/arm64/include/asm/hugetlb.h
> +++ b/arch/arm64/include/asm/hugetlb.h
> @@ -20,6 +20,7 @@
>  
>  #include <asm/page.h>
>  
> +#define __HAVE_ARCH_HUGE_PTEP_GET
>  static inline pte_t huge_ptep_get(pte_t *ptep)
>  {
>  	return READ_ONCE(*ptep);
> diff --git a/arch/ia64/include/asm/hugetlb.h b/arch/ia64/include/asm/hugetlb.h
> index e9b42750fdf5..36cc0396b214 100644
> --- a/arch/ia64/include/asm/hugetlb.h
> +++ b/arch/ia64/include/asm/hugetlb.h
> @@ -27,11 +27,6 @@ static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
>  {
>  }
>  
> -static inline pte_t huge_ptep_get(pte_t *ptep)
> -{
> -	return *ptep;
> -}
> -
>  static inline void arch_clear_hugepage_flags(struct page *page)
>  {
>  }
> diff --git a/arch/mips/include/asm/hugetlb.h b/arch/mips/include/asm/hugetlb.h
> index 120adc3b2ffd..425bb6fc3bda 100644
> --- a/arch/mips/include/asm/hugetlb.h
> +++ b/arch/mips/include/asm/hugetlb.h
> @@ -82,11 +82,6 @@ static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
>  	return changed;
>  }
>  
> -static inline pte_t huge_ptep_get(pte_t *ptep)
> -{
> -	return *ptep;
> -}
> -
>  static inline void arch_clear_hugepage_flags(struct page *page)
>  {
>  }
> diff --git a/arch/parisc/include/asm/hugetlb.h b/arch/parisc/include/asm/hugetlb.h
> index 165b4e5a6f32..7cb595dcb7d7 100644
> --- a/arch/parisc/include/asm/hugetlb.h
> +++ b/arch/parisc/include/asm/hugetlb.h
> @@ -48,11 +48,6 @@ int huge_ptep_set_access_flags(struct vm_area_struct *vma,
>  					     unsigned long addr, pte_t *ptep,
>  					     pte_t pte, int dirty);
>  
> -static inline pte_t huge_ptep_get(pte_t *ptep)
> -{
> -	return *ptep;
> -}
> -
>  static inline void arch_clear_hugepage_flags(struct page *page)
>  {
>  }
> diff --git a/arch/powerpc/include/asm/hugetlb.h b/arch/powerpc/include/asm/hugetlb.h
> index 658bf7136a3c..33a2d9e3ea9e 100644
> --- a/arch/powerpc/include/asm/hugetlb.h
> +++ b/arch/powerpc/include/asm/hugetlb.h
> @@ -142,11 +142,6 @@ extern int huge_ptep_set_access_flags(struct vm_area_struct *vma,
>  				      unsigned long addr, pte_t *ptep,
>  				      pte_t pte, int dirty);
>  
> -static inline pte_t huge_ptep_get(pte_t *ptep)
> -{
> -	return *ptep;
> -}
> -
>  static inline void arch_clear_hugepage_flags(struct page *page)
>  {
>  }
> diff --git a/arch/sh/include/asm/hugetlb.h b/arch/sh/include/asm/hugetlb.h
> index c87195ae0cfa..6f025fe18146 100644
> --- a/arch/sh/include/asm/hugetlb.h
> +++ b/arch/sh/include/asm/hugetlb.h
> @@ -32,11 +32,6 @@ static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
>  {
>  }
>  
> -static inline pte_t huge_ptep_get(pte_t *ptep)
> -{
> -	return *ptep;
> -}
> -
>  static inline void arch_clear_hugepage_flags(struct page *page)
>  {
>  	clear_bit(PG_dcache_clean, &page->flags);
> diff --git a/arch/sparc/include/asm/hugetlb.h b/arch/sparc/include/asm/hugetlb.h
> index 028a1465fbe7..3963f80d1cb3 100644
> --- a/arch/sparc/include/asm/hugetlb.h
> +++ b/arch/sparc/include/asm/hugetlb.h
> @@ -53,11 +53,6 @@ static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
>  	return changed;
>  }
>  
> -static inline pte_t huge_ptep_get(pte_t *ptep)
> -{
> -	return *ptep;
> -}
> -
>  static inline void arch_clear_hugepage_flags(struct page *page)
>  {
>  }
> diff --git a/arch/x86/include/asm/hugetlb.h b/arch/x86/include/asm/hugetlb.h
> index 1df8944904c6..c97b34a29054 100644
> --- a/arch/x86/include/asm/hugetlb.h
> +++ b/arch/x86/include/asm/hugetlb.h
> @@ -12,11 +12,6 @@ static inline int is_hugepage_only_range(struct mm_struct *mm,
>  	return 0;
>  }
>  
> -static inline pte_t huge_ptep_get(pte_t *ptep)
> -{
> -	return *ptep;
> -}
> -
>  static inline void arch_clear_hugepage_flags(struct page *page)
>  {
>  }
> diff --git a/include/asm-generic/hugetlb.h b/include/asm-generic/hugetlb.h
> index f3c99a03ee83..71d7b77eea50 100644
> --- a/include/asm-generic/hugetlb.h
> +++ b/include/asm-generic/hugetlb.h
> @@ -119,4 +119,11 @@ static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
>  }
>  #endif
>  
> +#ifndef __HAVE_ARCH_HUGE_PTEP_GET
> +static inline pte_t huge_ptep_get(pte_t *ptep)
> +{
> +	return *ptep;
> +}
> +#endif
> +
>  #endif /* _ASM_GENERIC_HUGETLB_H */
>