Re: [PATCH v4 09/11] hugetlb: Introduce generic version of huge_ptep_set_wrprotect

From: Mike Kravetz
Date: Thu Jul 26 2018 - 15:12:12 EST

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On 07/05/2018 04:07 AM, Alexandre Ghiti wrote:
> arm, ia64, mips, sh, x86 architectures use the same version
> of huge_ptep_set_wrprotect, so move this generic implementation into
> asm-generic/hugetlb.h.
> Note: powerpc uses twice for book3s/32 and nohash/32 the same version as
> the above architectures, but the modification was not straightforward
> and hence has not been done.
>

Just one small comment, otehrwise
Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>

> Signed-off-by: Alexandre Ghiti <alex@xxxxxxxx>
> ---
> 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/book3s/32/pgtable.h | 2 ++
> arch/powerpc/include/asm/book3s/64/pgtable.h | 1 +
> arch/powerpc/include/asm/nohash/32/pgtable.h | 2 ++
> arch/powerpc/include/asm/nohash/64/pgtable.h | 1 +

As in patch 03, the book3s and nohash header files do not explicitly
include <asm-generic/hugetlb.h>. With these, I had an even harder time
finding out who brought in that file. This is not an issue with this
patch, just wish there was some easier way to check/prove include file
dependencies. Since it compiles, I am sure it is OK.
--
Mike Kravetz

> 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 ++++++++
> 13 files changed, 17 insertions(+), 30 deletions(-)
>
> diff --git a/arch/arm/include/asm/hugetlb-3level.h b/arch/arm/include/asm/hugetlb-3level.h
> index b897541520ef..8247cd6a2ac6 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 huge_ptep_set_wrprotect(struct mm_struct *mm,
> - unsigned long addr, pte_t *ptep)
> -{
> - ptep_set_wrprotect(mm, addr, ptep);
> -}
> -
> static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
> unsigned long addr, pte_t *ptep,
> pte_t pte, int dirty)
> diff --git a/arch/arm64/include/asm/hugetlb.h b/arch/arm64/include/asm/hugetlb.h
> index 3e7f6e69b28d..f4f69ae5466e 100644
> --- a/arch/arm64/include/asm/hugetlb.h
> +++ b/arch/arm64/include/asm/hugetlb.h
> @@ -48,6 +48,7 @@ extern int huge_ptep_set_access_flags(struct vm_area_struct *vma,
> #define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
> extern pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
> unsigned long addr, pte_t *ptep);
> +#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
> extern void huge_ptep_set_wrprotect(struct mm_struct *mm,
> unsigned long addr, pte_t *ptep);
> #define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
> diff --git a/arch/ia64/include/asm/hugetlb.h b/arch/ia64/include/asm/hugetlb.h
> index cbe296271030..49d1f7949f3a 100644
> --- a/arch/ia64/include/asm/hugetlb.h
> +++ b/arch/ia64/include/asm/hugetlb.h
> @@ -27,12 +27,6 @@ static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
> {
> }
>
> -static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
> - unsigned long addr, pte_t *ptep)
> -{
> - ptep_set_wrprotect(mm, addr, ptep);
> -}
> -
> static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
> unsigned long addr, pte_t *ptep,
> pte_t pte, int dirty)
> diff --git a/arch/mips/include/asm/hugetlb.h b/arch/mips/include/asm/hugetlb.h
> index 6ff2531cfb1d..3dcf5debf8c4 100644
> --- a/arch/mips/include/asm/hugetlb.h
> +++ b/arch/mips/include/asm/hugetlb.h
> @@ -63,12 +63,6 @@ static inline int huge_pte_none(pte_t pte)
> return !val || (val == (unsigned long)invalid_pte_table);
> }
>
> -static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
> - unsigned long addr, pte_t *ptep)
> -{
> - ptep_set_wrprotect(mm, addr, ptep);
> -}
> -
> static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
> unsigned long addr,
> pte_t *ptep, pte_t pte,
> diff --git a/arch/parisc/include/asm/hugetlb.h b/arch/parisc/include/asm/hugetlb.h
> index fb7e0fd858a3..9c3950ca2974 100644
> --- a/arch/parisc/include/asm/hugetlb.h
> +++ b/arch/parisc/include/asm/hugetlb.h
> @@ -39,6 +39,7 @@ static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
> {
> }
>
> +#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
> void huge_ptep_set_wrprotect(struct mm_struct *mm,
> unsigned long addr, pte_t *ptep);
>
> diff --git a/arch/powerpc/include/asm/book3s/32/pgtable.h b/arch/powerpc/include/asm/book3s/32/pgtable.h
> index 02f5acd7ccc4..d2cd1d0226e9 100644
> --- a/arch/powerpc/include/asm/book3s/32/pgtable.h
> +++ b/arch/powerpc/include/asm/book3s/32/pgtable.h
> @@ -228,6 +228,8 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
> {
> pte_update(ptep, (_PAGE_RW | _PAGE_HWWRITE), _PAGE_RO);
> }
> +
> +#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
> static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
> unsigned long addr, pte_t *ptep)
> {
> diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
> index 42aafba7a308..7d957f7c47cd 100644
> --- a/arch/powerpc/include/asm/book3s/64/pgtable.h
> +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
> @@ -451,6 +451,7 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
> pte_update(mm, addr, ptep, 0, _PAGE_PRIVILEGED, 0);
> }
>
> +#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
> static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
> unsigned long addr, pte_t *ptep)
> {
> diff --git a/arch/powerpc/include/asm/nohash/32/pgtable.h b/arch/powerpc/include/asm/nohash/32/pgtable.h
> index 7c46a98cc7f4..f39e200d9591 100644
> --- a/arch/powerpc/include/asm/nohash/32/pgtable.h
> +++ b/arch/powerpc/include/asm/nohash/32/pgtable.h
> @@ -249,6 +249,8 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
> {
> pte_update(ptep, (_PAGE_RW | _PAGE_HWWRITE), _PAGE_RO);
> }
> +
> +#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
> static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
> unsigned long addr, pte_t *ptep)
> {
> diff --git a/arch/powerpc/include/asm/nohash/64/pgtable.h b/arch/powerpc/include/asm/nohash/64/pgtable.h
> index dd0c7236208f..69fbf7e9b4db 100644
> --- a/arch/powerpc/include/asm/nohash/64/pgtable.h
> +++ b/arch/powerpc/include/asm/nohash/64/pgtable.h
> @@ -238,6 +238,7 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
> pte_update(mm, addr, ptep, _PAGE_RW, 0, 0);
> }
>
> +#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
> static inline void huge_ptep_set_wrprotect(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 f1bbd255ee43..8df4004977b9 100644
> --- a/arch/sh/include/asm/hugetlb.h
> +++ b/arch/sh/include/asm/hugetlb.h
> @@ -32,12 +32,6 @@ static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
> {
> }
>
> -static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
> - unsigned long addr, pte_t *ptep)
> -{
> - ptep_set_wrprotect(mm, addr, ptep);
> -}
> -
> static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
> unsigned long addr, pte_t *ptep,
> pte_t pte, int dirty)
> diff --git a/arch/sparc/include/asm/hugetlb.h b/arch/sparc/include/asm/hugetlb.h
> index 2101ea217f33..c41754a113f3 100644
> --- a/arch/sparc/include/asm/hugetlb.h
> +++ b/arch/sparc/include/asm/hugetlb.h
> @@ -32,6 +32,7 @@ static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
> {
> }
>
> +#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
> static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
> unsigned long addr, pte_t *ptep)
> {
> diff --git a/arch/x86/include/asm/hugetlb.h b/arch/x86/include/asm/hugetlb.h
> index 2e5117d37c7d..de370836a17d 100644
> --- a/arch/x86/include/asm/hugetlb.h
> +++ b/arch/x86/include/asm/hugetlb.h
> @@ -12,12 +12,6 @@ static inline int is_hugepage_only_range(struct mm_struct *mm,
> return 0;
> }
>
> -static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
> - unsigned long addr, pte_t *ptep)
> -{
> - ptep_set_wrprotect(mm, addr, ptep);
> -}
> -
> static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
> unsigned long addr, pte_t *ptep,
> pte_t pte, int dirty)
> diff --git a/include/asm-generic/hugetlb.h b/include/asm-generic/hugetlb.h
> index 6c0c8b0c71e0..9b9039845278 100644
> --- a/include/asm-generic/hugetlb.h
> +++ b/include/asm-generic/hugetlb.h
> @@ -102,4 +102,12 @@ static inline int prepare_hugepage_range(struct file *file,
> }
> #endif
>
> +#ifndef __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
> +static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
> + unsigned long addr, pte_t *ptep)
> +{
> + ptep_set_wrprotect(mm, addr, ptep);
> +}
> +#endif
> +
> #endif /* _ASM_GENERIC_HUGETLB_H */
>

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