Re: [PATCH v5 09/11] hugetlb: Introduce generic version of huge_ptep_set_wrprotect

[Alex Ghiti <alex@xxxxxxxx>]

Ok, I tried every defconfig available:

- for the nohash/32, I found that I could use mpc885_ads_defconfig and I 
activated HUGETLBFS.
I removed the definition of huge_ptep_set_wrprotect from 
nohash/32/pgtable.h, add an #error in
include/asm-generic/hugetlb.h right before the generic definition of 
huge_ptep_set_wrprotect,
and fell onto it at compile-time:
=> I'm pretty confident then that removing the definition of 
huge_ptep_set_wrprotect does not
break anythingin this case.

- regardind book3s/32, I did not find any defconfig with 
CONFIG_PPC_BOOK3S_32, CONFIG_PPC32
allowing to enable huge page support (ie CONFIG_SYS_SUPPORTS_HUGETLBFS)
=> Do you have a defconfig that would allow me to try the same as above ?

Thanks,

Alex


On 07/31/2018 11:17 AM, Alexandre Ghiti wrote:
> On 07/31/2018 12:06 PM, Michael Ellerman wrote:
> > Alexandre Ghiti <alex@xxxxxxxx> writes:
> >
> > > 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.
> > Do you remember what the problem was there?
> >
> > It looks like you should just be able to drop them like the others. I
> > assume there's some header spaghetti that causes problems though?
>
> Yes, the header spaghetti frightened me a bit. Maybe I should have 
> tried harder: I can try to remove them and find the right defconfigs 
> to compile both to begin with. And to guarantee the functionality is 
> preserved, can I use the testsuite of libhugetlbfs with qemu ?
>
> Alex
>
> > cheers
> >
> >
> > > Signed-off-by: Alexandre Ghiti <alex@xxxxxxxx>
> > > Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
> > > ---
> > >   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 +
> > >   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 59c056adb3c9..a3f781f7a264 100644
> > > --- a/arch/x86/include/asm/hugetlb.h
> > > +++ b/arch/x86/include/asm/hugetlb.h
> > > @@ -13,12 +13,6 @@ 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 */
> > > --
> > > 2.16.2