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Subject: Re: [PATCH v4 03/11] hugetlb: Introduce generic version of
 set_huge_pte_at
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>
 <20180705110716.3919-4-alex@ghiti.fr>
From:   Mike Kravetz <mike.kravetz@oracle.com>
Message-ID: <b9341c15-38d5-8a6f-2e51-bae3f6593880@oracle.com>
Date:   Thu, 26 Jul 2018 12:00:06 -0700
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On 07/05/2018 04:07 AM, Alexandre Ghiti wrote:
> arm, ia64, mips, powerpc, sh, x86 architectures use the
> same version of set_huge_pte_at, so move this generic
> implementation into asm-generic/hugetlb.h.
> 

Just one comment below, otherwise:
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>

> Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
> ---
>  arch/arm/include/asm/hugetlb-3level.h | 6 ------
>  arch/arm64/include/asm/hugetlb.h      | 1 +
>  arch/ia64/include/asm/hugetlb.h       | 6 ------
>  arch/mips/include/asm/hugetlb.h       | 6 ------
>  arch/parisc/include/asm/hugetlb.h     | 1 +
>  arch/powerpc/include/asm/hugetlb.h    | 6 ------
>  arch/sh/include/asm/hugetlb.h         | 6 ------
>  arch/sparc/include/asm/hugetlb.h      | 1 +
>  arch/x86/include/asm/hugetlb.h        | 6 ------
>  include/asm-generic/hugetlb.h         | 8 +++++++-
>  10 files changed, 10 insertions(+), 37 deletions(-)
> 
> diff --git a/arch/arm/include/asm/hugetlb-3level.h b/arch/arm/include/asm/hugetlb-3level.h
> index d4014fbe5ea3..398fb06e8207 100644
> --- a/arch/arm/include/asm/hugetlb-3level.h
> +++ b/arch/arm/include/asm/hugetlb-3level.h
> @@ -37,12 +37,6 @@ static inline pte_t huge_ptep_get(pte_t *ptep)
>  	return retval;
>  }
>  
> -static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
> -				   pte_t *ptep, pte_t pte)
> -{
> -	set_pte_at(mm, addr, ptep, pte);
> -}
> -

Since <asm-generic/hugetlb.h> is not directly included in this file,
I had to search around in the #include dependency chain to look for
it.  It makes me just a tiny bit nervous, but since it compiled, I'm
sure there is not an issue.
-- 
Mike Kravetz

>  static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
>  					 unsigned long addr, pte_t *ptep)
>  {
> diff --git a/arch/arm64/include/asm/hugetlb.h b/arch/arm64/include/asm/hugetlb.h
> index 4af1a800a900..874661a1dff1 100644
> --- a/arch/arm64/include/asm/hugetlb.h
> +++ b/arch/arm64/include/asm/hugetlb.h
> @@ -60,6 +60,7 @@ static inline void arch_clear_hugepage_flags(struct page *page)
>  extern pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
>  				struct page *page, int writable);
>  #define arch_make_huge_pte arch_make_huge_pte
> +#define __HAVE_ARCH_HUGE_SET_HUGE_PTE_AT
>  extern void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
>  			    pte_t *ptep, pte_t pte);
>  extern int huge_ptep_set_access_flags(struct vm_area_struct *vma,
> diff --git a/arch/ia64/include/asm/hugetlb.h b/arch/ia64/include/asm/hugetlb.h
> index afe9fa4d969b..a235d6f60fb3 100644
> --- a/arch/ia64/include/asm/hugetlb.h
> +++ b/arch/ia64/include/asm/hugetlb.h
> @@ -20,12 +20,6 @@ static inline int is_hugepage_only_range(struct mm_struct *mm,
>  		REGION_NUMBER((addr)+(len)-1) == RGN_HPAGE);
>  }
>  
> -static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
> -				   pte_t *ptep, pte_t pte)
> -{
> -	set_pte_at(mm, addr, ptep, pte);
> -}
> -
>  static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
>  					    unsigned long addr, pte_t *ptep)
>  {
> diff --git a/arch/mips/include/asm/hugetlb.h b/arch/mips/include/asm/hugetlb.h
> index 53764050243e..8ea439041d5d 100644
> --- a/arch/mips/include/asm/hugetlb.h
> +++ b/arch/mips/include/asm/hugetlb.h
> @@ -36,12 +36,6 @@ static inline int prepare_hugepage_range(struct file *file,
>  	return 0;
>  }
>  
> -static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
> -				   pte_t *ptep, pte_t pte)
> -{
> -	set_pte_at(mm, addr, ptep, pte);
> -}
> -
>  static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
>  					    unsigned long addr, pte_t *ptep)
>  {
> diff --git a/arch/parisc/include/asm/hugetlb.h b/arch/parisc/include/asm/hugetlb.h
> index 28c23b68d38d..77c8adbac7c3 100644
> --- a/arch/parisc/include/asm/hugetlb.h
> +++ b/arch/parisc/include/asm/hugetlb.h
> @@ -4,6 +4,7 @@
>  
>  #include <asm/page.h>
>  
> +#define __HAVE_ARCH_HUGE_SET_HUGE_PTE_AT
>  void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
>  		     pte_t *ptep, pte_t pte);
>  
> diff --git a/arch/powerpc/include/asm/hugetlb.h b/arch/powerpc/include/asm/hugetlb.h
> index a7d5c739df9b..0794b53439d4 100644
> --- a/arch/powerpc/include/asm/hugetlb.h
> +++ b/arch/powerpc/include/asm/hugetlb.h
> @@ -132,12 +132,6 @@ static inline int prepare_hugepage_range(struct file *file,
>  	return 0;
>  }
>  
> -static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
> -				   pte_t *ptep, pte_t pte)
> -{
> -	set_pte_at(mm, addr, ptep, pte);
> -}
> -
>  static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
>  					    unsigned long addr, pte_t *ptep)
>  {
> diff --git a/arch/sh/include/asm/hugetlb.h b/arch/sh/include/asm/hugetlb.h
> index f6a51b609409..bc552e37c1c9 100644
> --- a/arch/sh/include/asm/hugetlb.h
> +++ b/arch/sh/include/asm/hugetlb.h
> @@ -25,12 +25,6 @@ static inline int prepare_hugepage_range(struct file *file,
>  	return 0;
>  }
>  
> -static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
> -				   pte_t *ptep, pte_t pte)
> -{
> -	set_pte_at(mm, addr, ptep, pte);
> -}
> -
>  static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
>  					    unsigned long addr, pte_t *ptep)
>  {
> diff --git a/arch/sparc/include/asm/hugetlb.h b/arch/sparc/include/asm/hugetlb.h
> index 59d89b52ccb7..16b0c53ea6c9 100644
> --- a/arch/sparc/include/asm/hugetlb.h
> +++ b/arch/sparc/include/asm/hugetlb.h
> @@ -12,6 +12,7 @@ struct pud_huge_patch_entry {
>  extern struct pud_huge_patch_entry __pud_huge_patch, __pud_huge_patch_end;
>  #endif
>  
> +#define __HAVE_ARCH_HUGE_SET_HUGE_PTE_AT
>  void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
>  		     pte_t *ptep, pte_t pte);
>  
> diff --git a/arch/x86/include/asm/hugetlb.h b/arch/x86/include/asm/hugetlb.h
> index 996ce8e15365..554d5614b375 100644
> --- a/arch/x86/include/asm/hugetlb.h
> +++ b/arch/x86/include/asm/hugetlb.h
> @@ -27,12 +27,6 @@ static inline int prepare_hugepage_range(struct file *file,
>  	return 0;
>  }
>  
> -static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
> -				   pte_t *ptep, pte_t pte)
> -{
> -	set_pte_at(mm, addr, ptep, pte);
> -}
> -
>  static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
>  					    unsigned long addr, pte_t *ptep)
>  {
> diff --git a/include/asm-generic/hugetlb.h b/include/asm-generic/hugetlb.h
> index c697ca9dda18..ee010b756246 100644
> --- a/include/asm-generic/hugetlb.h
> +++ b/include/asm-generic/hugetlb.h
> @@ -47,8 +47,14 @@ static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
>  {
>  	free_pgd_range(tlb, addr, end, floor, ceiling);
>  }
> +#endif
>  
> -
> +#ifndef __HAVE_ARCH_HUGE_SET_HUGE_PTE_AT
> +static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
> +		pte_t *ptep, pte_t pte)
> +{
> +	set_pte_at(mm, addr, ptep, pte);
> +}
>  #endif
>  
>  #endif /* _ASM_GENERIC_HUGETLB_H */
>