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Subject: Re: [PATCH v4 08/11] hugetlb: Introduce generic version of
 prepare_hugepage_range
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>
 <20180705110716.3919-9-alex@ghiti.fr>
From:   Mike Kravetz <mike.kravetz@oracle.com>
Message-ID: <5f2bebab-4ee9-bdbe-fcaa-445d6fd2dc69@oracle.com>
Date:   Thu, 26 Jul 2018 12:05:58 -0700
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On 07/05/2018 04:07 AM, Alexandre Ghiti wrote:
> arm, arm64, powerpc, sparc, x86 architectures use the same version of
> prepare_hugepage_range, 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.h     | 11 -----------
>  arch/arm64/include/asm/hugetlb.h   | 11 -----------
>  arch/ia64/include/asm/hugetlb.h    |  1 +
>  arch/mips/include/asm/hugetlb.h    |  1 +
>  arch/parisc/include/asm/hugetlb.h  |  1 +
>  arch/powerpc/include/asm/hugetlb.h | 15 ---------------
>  arch/sh/include/asm/hugetlb.h      |  1 +
>  arch/sparc/include/asm/hugetlb.h   | 16 ----------------
>  arch/x86/include/asm/hugetlb.h     | 15 ---------------
>  include/asm-generic/hugetlb.h      | 15 +++++++++++++++
>  10 files changed, 19 insertions(+), 68 deletions(-)
> 
> diff --git a/arch/arm/include/asm/hugetlb.h b/arch/arm/include/asm/hugetlb.h
> index 1e718a626ef9..34fb401efe81 100644
> --- a/arch/arm/include/asm/hugetlb.h
> +++ b/arch/arm/include/asm/hugetlb.h
> @@ -32,17 +32,6 @@ static inline int is_hugepage_only_range(struct mm_struct *mm,
>  	return 0;
>  }
>  
> -static inline int prepare_hugepage_range(struct file *file,
> -					 unsigned long addr, unsigned long len)
> -{
> -	struct hstate *h = hstate_file(file);
> -	if (len & ~huge_page_mask(h))
> -		return -EINVAL;
> -	if (addr & ~huge_page_mask(h))
> -		return -EINVAL;
> -	return 0;
> -}
> -
>  static inline void arch_clear_hugepage_flags(struct page *page)
>  {
>  	clear_bit(PG_dcache_clean, &page->flags);
> diff --git a/arch/arm64/include/asm/hugetlb.h b/arch/arm64/include/asm/hugetlb.h
> index 1fd64ebf0cd7..3e7f6e69b28d 100644
> --- a/arch/arm64/include/asm/hugetlb.h
> +++ b/arch/arm64/include/asm/hugetlb.h
> @@ -31,17 +31,6 @@ static inline int is_hugepage_only_range(struct mm_struct *mm,
>  	return 0;
>  }
>  
> -static inline int prepare_hugepage_range(struct file *file,
> -					 unsigned long addr, unsigned long len)
> -{
> -	struct hstate *h = hstate_file(file);
> -	if (len & ~huge_page_mask(h))
> -		return -EINVAL;
> -	if (addr & ~huge_page_mask(h))
> -		return -EINVAL;
> -	return 0;
> -}
> -
>  static inline void arch_clear_hugepage_flags(struct page *page)
>  {
>  	clear_bit(PG_dcache_clean, &page->flags);
> diff --git a/arch/ia64/include/asm/hugetlb.h b/arch/ia64/include/asm/hugetlb.h
> index 82fe3d7a38d9..cbe296271030 100644
> --- a/arch/ia64/include/asm/hugetlb.h
> +++ b/arch/ia64/include/asm/hugetlb.h
> @@ -9,6 +9,7 @@ void hugetlb_free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
>  			    unsigned long end, unsigned long floor,
>  			    unsigned long ceiling);
>  
> +#define __HAVE_ARCH_PREPARE_HUGEPAGE_RANGE
>  int prepare_hugepage_range(struct file *file,
>  			unsigned long addr, unsigned long len);
>  
> diff --git a/arch/mips/include/asm/hugetlb.h b/arch/mips/include/asm/hugetlb.h
> index b3d6bb53ee6e..6ff2531cfb1d 100644
> --- a/arch/mips/include/asm/hugetlb.h
> +++ b/arch/mips/include/asm/hugetlb.h
> @@ -18,6 +18,7 @@ static inline int is_hugepage_only_range(struct mm_struct *mm,
>  	return 0;
>  }
>  
> +#define __HAVE_ARCH_PREPARE_HUGEPAGE_RANGE
>  static inline int prepare_hugepage_range(struct file *file,
>  					 unsigned long addr,
>  					 unsigned long len)
> diff --git a/arch/parisc/include/asm/hugetlb.h b/arch/parisc/include/asm/hugetlb.h
> index 5a102d7251e4..fb7e0fd858a3 100644
> --- a/arch/parisc/include/asm/hugetlb.h
> +++ b/arch/parisc/include/asm/hugetlb.h
> @@ -22,6 +22,7 @@ static inline int is_hugepage_only_range(struct mm_struct *mm,
>   * If the arch doesn't supply something else, assume that hugepage
>   * size aligned regions are ok without further preparation.
>   */
> +#define __HAVE_ARCH_PREPARE_HUGEPAGE_RANGE
>  static inline int prepare_hugepage_range(struct file *file,
>  			unsigned long addr, unsigned long len)
>  {
> diff --git a/arch/powerpc/include/asm/hugetlb.h b/arch/powerpc/include/asm/hugetlb.h
> index 7123599089c6..69c14ecac133 100644
> --- a/arch/powerpc/include/asm/hugetlb.h
> +++ b/arch/powerpc/include/asm/hugetlb.h
> @@ -117,21 +117,6 @@ void hugetlb_free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
>  			    unsigned long end, unsigned long floor,
>  			    unsigned long ceiling);
>  
> -/*
> - * If the arch doesn't supply something else, assume that hugepage
> - * size aligned regions are ok without further preparation.
> - */
> -static inline int prepare_hugepage_range(struct file *file,
> -			unsigned long addr, unsigned long len)
> -{
> -	struct hstate *h = hstate_file(file);
> -	if (len & ~huge_page_mask(h))
> -		return -EINVAL;
> -	if (addr & ~huge_page_mask(h))
> -		return -EINVAL;
> -	return 0;
> -}
> -
>  #define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
>  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 54f65094efe6..f1bbd255ee43 100644
> --- a/arch/sh/include/asm/hugetlb.h
> +++ b/arch/sh/include/asm/hugetlb.h
> @@ -15,6 +15,7 @@ static inline int is_hugepage_only_range(struct mm_struct *mm,
>   * If the arch doesn't supply something else, assume that hugepage
>   * size aligned regions are ok without further preparation.
>   */
> +#define __HAVE_ARCH_PREPARE_HUGEPAGE_RANGE
>  static inline int prepare_hugepage_range(struct file *file,
>  			unsigned long addr, unsigned long len)
>  {
> diff --git a/arch/sparc/include/asm/hugetlb.h b/arch/sparc/include/asm/hugetlb.h
> index f661362376e0..2101ea217f33 100644
> --- a/arch/sparc/include/asm/hugetlb.h
> +++ b/arch/sparc/include/asm/hugetlb.h
> @@ -26,22 +26,6 @@ static inline int is_hugepage_only_range(struct mm_struct *mm,
>  	return 0;
>  }
>  
> -/*
> - * If the arch doesn't supply something else, assume that hugepage
> - * size aligned regions are ok without further preparation.
> - */
> -static inline int prepare_hugepage_range(struct file *file,
> -			unsigned long addr, unsigned long len)
> -{
> -	struct hstate *h = hstate_file(file);
> -
> -	if (len & ~huge_page_mask(h))
> -		return -EINVAL;
> -	if (addr & ~huge_page_mask(h))
> -		return -EINVAL;
> -	return 0;
> -}
> -
>  #define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
>  static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
>  					 unsigned long addr, pte_t *ptep)
> diff --git a/arch/x86/include/asm/hugetlb.h b/arch/x86/include/asm/hugetlb.h
> index 19668672ab37..2e5117d37c7d 100644
> --- a/arch/x86/include/asm/hugetlb.h
> +++ b/arch/x86/include/asm/hugetlb.h
> @@ -12,21 +12,6 @@ static inline int is_hugepage_only_range(struct mm_struct *mm,
>  	return 0;
>  }
>  
> -/*
> - * If the arch doesn't supply something else, assume that hugepage
> - * size aligned regions are ok without further preparation.
> - */
> -static inline int prepare_hugepage_range(struct file *file,
> -			unsigned long addr, unsigned long len)
> -{
> -	struct hstate *h = hstate_file(file);
> -	if (len & ~huge_page_mask(h))
> -		return -EINVAL;
> -	if (addr & ~huge_page_mask(h))
> -		return -EINVAL;
> -	return 0;
> -}
> -
>  static inline void huge_ptep_set_wrprotect(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 cd9697672b79..6c0c8b0c71e0 100644
> --- a/include/asm-generic/hugetlb.h
> +++ b/include/asm-generic/hugetlb.h
> @@ -87,4 +87,19 @@ static inline pte_t huge_pte_wrprotect(pte_t pte)
>  }
>  #endif
>  
> +#ifndef __HAVE_ARCH_PREPARE_HUGEPAGE_RANGE
> +static inline int prepare_hugepage_range(struct file *file,
> +		unsigned long addr, unsigned long len)
> +{
> +	struct hstate *h = hstate_file(file);
> +
> +	if (len & ~huge_page_mask(h))
> +		return -EINVAL;
> +	if (addr & ~huge_page_mask(h))
> +		return -EINVAL;
> +
> +	return 0;
> +}
> +#endif
> +
>  #endif /* _ASM_GENERIC_HUGETLB_H */
>