| Message ID | 1643029028-12710-5-git-send-email-anshuman.khandual@arm.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | mm/mmap: Drop protection_map[] and platform's __SXXX/__PXXX requirements | expand |
On Mon, Jan 24, 2022 at 06:26:41PM +0530, Anshuman Khandual wrote: > This defines and exports a platform specific custom vm_get_page_prot() via > subscribing ARCH_HAS_VM_GET_PAGE_PROT. Subsequently all __SXXX and __PXXX > macros can be dropped which are no longer needed. While here, this also > localizes arch_vm_get_page_prot() as powerpc_vm_get_page_prot(). > > Cc: Michael Ellerman <mpe@ellerman.id.au> > Cc: Paul Mackerras <paulus@samba.org> > Cc: linuxppc-dev@lists.ozlabs.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> > --- > arch/powerpc/Kconfig | 1 + > arch/powerpc/include/asm/mman.h | 3 +- > arch/powerpc/include/asm/pgtable.h | 19 ------------ > arch/powerpc/mm/mmap.c | 47 ++++++++++++++++++++++++++++++ > 4 files changed, 49 insertions(+), 21 deletions(-) > > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index b779603978e1..ddb4a3687c05 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -135,6 +135,7 @@ config PPC > select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST > select ARCH_HAS_UACCESS_FLUSHCACHE > select ARCH_HAS_UBSAN_SANITIZE_ALL > + select ARCH_HAS_VM_GET_PAGE_PROT > select ARCH_HAVE_NMI_SAFE_CMPXCHG > select ARCH_KEEP_MEMBLOCK > select ARCH_MIGHT_HAVE_PC_PARPORT > diff --git a/arch/powerpc/include/asm/mman.h b/arch/powerpc/include/asm/mman.h > index 7cb6d18f5cd6..7b10c2031e82 100644 > --- a/arch/powerpc/include/asm/mman.h > +++ b/arch/powerpc/include/asm/mman.h > @@ -24,7 +24,7 @@ static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot, > } > #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey) > > -static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags) > +static inline pgprot_t powerpc_vm_get_page_prot(unsigned long vm_flags) > { > #ifdef CONFIG_PPC_MEM_KEYS > return (vm_flags & VM_SAO) ? > @@ -34,7 +34,6 @@ static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags) > return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0); > #endif > } > -#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags) > > static inline bool arch_validate_prot(unsigned long prot, unsigned long addr) > { > diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h > index d564d0ecd4cd..3cbb6de20f9d 100644 > --- a/arch/powerpc/include/asm/pgtable.h > +++ b/arch/powerpc/include/asm/pgtable.h > @@ -20,25 +20,6 @@ struct mm_struct; > #include <asm/nohash/pgtable.h> > #endif /* !CONFIG_PPC_BOOK3S */ > > -/* Note due to the way vm flags are laid out, the bits are XWR */ > -#define __P000 PAGE_NONE > -#define __P001 PAGE_READONLY > -#define __P010 PAGE_COPY > -#define __P011 PAGE_COPY > -#define __P100 PAGE_READONLY_X > -#define __P101 PAGE_READONLY_X > -#define __P110 PAGE_COPY_X > -#define __P111 PAGE_COPY_X > - > -#define __S000 PAGE_NONE > -#define __S001 PAGE_READONLY > -#define __S010 PAGE_SHARED > -#define __S011 PAGE_SHARED > -#define __S100 PAGE_READONLY_X > -#define __S101 PAGE_READONLY_X > -#define __S110 PAGE_SHARED_X > -#define __S111 PAGE_SHARED_X > - > #ifndef __ASSEMBLY__ > > #ifndef MAX_PTRS_PER_PGD > diff --git a/arch/powerpc/mm/mmap.c b/arch/powerpc/mm/mmap.c > index c475cf810aa8..7f05e7903bd2 100644 > --- a/arch/powerpc/mm/mmap.c > +++ b/arch/powerpc/mm/mmap.c > @@ -254,3 +254,50 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) > mm->get_unmapped_area = arch_get_unmapped_area_topdown; > } > } > + > +static inline pgprot_t __vm_get_page_prot(unsigned long vm_flags) > +{ > + switch (vm_flags & (VM_READ | VM_WRITE | VM_EXEC | VM_SHARED)) { > + case VM_NONE: > + return PAGE_NONE; > + case VM_READ: > + return PAGE_READONLY; > + case VM_WRITE: > + return PAGE_COPY; > + case VM_READ | VM_WRITE: > + return PAGE_COPY; > + case VM_EXEC: > + return PAGE_READONLY_X; > + case VM_EXEC | VM_READ: > + return PAGE_READONLY_X; > + case VM_EXEC | VM_WRITE: > + return PAGE_COPY_X; > + case VM_EXEC | VM_READ | VM_WRITE: > + return PAGE_COPY_X; > + case VM_SHARED: > + return PAGE_NONE; > + case VM_SHARED | VM_READ: > + return PAGE_READONLY; > + case VM_SHARED | VM_WRITE: > + return PAGE_SHARED; > + case VM_SHARED | VM_READ | VM_WRITE: > + return PAGE_SHARED; > + case VM_SHARED | VM_EXEC: > + return PAGE_READONLY_X; > + case VM_SHARED | VM_EXEC | VM_READ: > + return PAGE_READONLY_X; > + case VM_SHARED | VM_EXEC | VM_WRITE: > + return PAGE_SHARED_X; > + case VM_SHARED | VM_EXEC | VM_READ | VM_WRITE: > + return PAGE_SHARED_X; > + default: > + BUILD_BUG(); > + } > +} > + > +pgprot_t vm_get_page_prot(unsigned long vm_flags) > +{ > + return __pgprot(pgprot_val(__vm_get_page_prot(vm_flags)) | > + pgprot_val(powerpc_vm_get_page_prot(vm_flags))); Any reason to keep powerpc_vm_get_page_prot() rather than open code it here? This applies to other architectures that implement arch_vm_get_page_prot() and/or arch_filter_pgprot() as well. > +} > +EXPORT_SYMBOL(vm_get_page_prot); > -- > 2.25.1 > >
On 2/3/22 11:45 PM, Mike Rapoport wrote: > On Mon, Jan 24, 2022 at 06:26:41PM +0530, Anshuman Khandual wrote: >> This defines and exports a platform specific custom vm_get_page_prot() via >> subscribing ARCH_HAS_VM_GET_PAGE_PROT. Subsequently all __SXXX and __PXXX >> macros can be dropped which are no longer needed. While here, this also >> localizes arch_vm_get_page_prot() as powerpc_vm_get_page_prot(). >> >> Cc: Michael Ellerman <mpe@ellerman.id.au> >> Cc: Paul Mackerras <paulus@samba.org> >> Cc: linuxppc-dev@lists.ozlabs.org >> Cc: linux-kernel@vger.kernel.org >> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> >> --- >> arch/powerpc/Kconfig | 1 + >> arch/powerpc/include/asm/mman.h | 3 +- >> arch/powerpc/include/asm/pgtable.h | 19 ------------ >> arch/powerpc/mm/mmap.c | 47 ++++++++++++++++++++++++++++++ >> 4 files changed, 49 insertions(+), 21 deletions(-) >> >> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig >> index b779603978e1..ddb4a3687c05 100644 >> --- a/arch/powerpc/Kconfig >> +++ b/arch/powerpc/Kconfig >> @@ -135,6 +135,7 @@ config PPC >> select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST >> select ARCH_HAS_UACCESS_FLUSHCACHE >> select ARCH_HAS_UBSAN_SANITIZE_ALL >> + select ARCH_HAS_VM_GET_PAGE_PROT >> select ARCH_HAVE_NMI_SAFE_CMPXCHG >> select ARCH_KEEP_MEMBLOCK >> select ARCH_MIGHT_HAVE_PC_PARPORT >> diff --git a/arch/powerpc/include/asm/mman.h b/arch/powerpc/include/asm/mman.h >> index 7cb6d18f5cd6..7b10c2031e82 100644 >> --- a/arch/powerpc/include/asm/mman.h >> +++ b/arch/powerpc/include/asm/mman.h >> @@ -24,7 +24,7 @@ static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot, >> } >> #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey) >> >> -static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags) >> +static inline pgprot_t powerpc_vm_get_page_prot(unsigned long vm_flags) >> { >> #ifdef CONFIG_PPC_MEM_KEYS >> return (vm_flags & VM_SAO) ? >> @@ -34,7 +34,6 @@ static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags) >> return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0); >> #endif >> } >> -#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags) >> >> static inline bool arch_validate_prot(unsigned long prot, unsigned long addr) >> { >> diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h >> index d564d0ecd4cd..3cbb6de20f9d 100644 >> --- a/arch/powerpc/include/asm/pgtable.h >> +++ b/arch/powerpc/include/asm/pgtable.h >> @@ -20,25 +20,6 @@ struct mm_struct; >> #include <asm/nohash/pgtable.h> >> #endif /* !CONFIG_PPC_BOOK3S */ >> >> -/* Note due to the way vm flags are laid out, the bits are XWR */ >> -#define __P000 PAGE_NONE >> -#define __P001 PAGE_READONLY >> -#define __P010 PAGE_COPY >> -#define __P011 PAGE_COPY >> -#define __P100 PAGE_READONLY_X >> -#define __P101 PAGE_READONLY_X >> -#define __P110 PAGE_COPY_X >> -#define __P111 PAGE_COPY_X >> - >> -#define __S000 PAGE_NONE >> -#define __S001 PAGE_READONLY >> -#define __S010 PAGE_SHARED >> -#define __S011 PAGE_SHARED >> -#define __S100 PAGE_READONLY_X >> -#define __S101 PAGE_READONLY_X >> -#define __S110 PAGE_SHARED_X >> -#define __S111 PAGE_SHARED_X >> - >> #ifndef __ASSEMBLY__ >> >> #ifndef MAX_PTRS_PER_PGD >> diff --git a/arch/powerpc/mm/mmap.c b/arch/powerpc/mm/mmap.c >> index c475cf810aa8..7f05e7903bd2 100644 >> --- a/arch/powerpc/mm/mmap.c >> +++ b/arch/powerpc/mm/mmap.c >> @@ -254,3 +254,50 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) >> mm->get_unmapped_area = arch_get_unmapped_area_topdown; >> } >> } >> + >> +static inline pgprot_t __vm_get_page_prot(unsigned long vm_flags) >> +{ >> + switch (vm_flags & (VM_READ | VM_WRITE | VM_EXEC | VM_SHARED)) { >> + case VM_NONE: >> + return PAGE_NONE; >> + case VM_READ: >> + return PAGE_READONLY; >> + case VM_WRITE: >> + return PAGE_COPY; >> + case VM_READ | VM_WRITE: >> + return PAGE_COPY; >> + case VM_EXEC: >> + return PAGE_READONLY_X; >> + case VM_EXEC | VM_READ: >> + return PAGE_READONLY_X; >> + case VM_EXEC | VM_WRITE: >> + return PAGE_COPY_X; >> + case VM_EXEC | VM_READ | VM_WRITE: >> + return PAGE_COPY_X; >> + case VM_SHARED: >> + return PAGE_NONE; >> + case VM_SHARED | VM_READ: >> + return PAGE_READONLY; >> + case VM_SHARED | VM_WRITE: >> + return PAGE_SHARED; >> + case VM_SHARED | VM_READ | VM_WRITE: >> + return PAGE_SHARED; >> + case VM_SHARED | VM_EXEC: >> + return PAGE_READONLY_X; >> + case VM_SHARED | VM_EXEC | VM_READ: >> + return PAGE_READONLY_X; >> + case VM_SHARED | VM_EXEC | VM_WRITE: >> + return PAGE_SHARED_X; >> + case VM_SHARED | VM_EXEC | VM_READ | VM_WRITE: >> + return PAGE_SHARED_X; >> + default: >> + BUILD_BUG(); >> + } >> +} >> + >> +pgprot_t vm_get_page_prot(unsigned long vm_flags) >> +{ >> + return __pgprot(pgprot_val(__vm_get_page_prot(vm_flags)) | >> + pgprot_val(powerpc_vm_get_page_prot(vm_flags))); > Any reason to keep powerpc_vm_get_page_prot() rather than open code it > here? > > This applies to other architectures that implement arch_vm_get_page_prot() > and/or arch_filter_pgprot() as well. Just to minimize the code churn ! But I will be happy to open code them here (and in other platforms) if that will be preferred.
On Fri, Feb 04, 2022 at 08:27:37AM +0530, Anshuman Khandual wrote: > > On 2/3/22 11:45 PM, Mike Rapoport wrote: > > On Mon, Jan 24, 2022 at 06:26:41PM +0530, Anshuman Khandual wrote: > >> This defines and exports a platform specific custom vm_get_page_prot() via > >> subscribing ARCH_HAS_VM_GET_PAGE_PROT. Subsequently all __SXXX and __PXXX > >> macros can be dropped which are no longer needed. While here, this also > >> localizes arch_vm_get_page_prot() as powerpc_vm_get_page_prot(). > >> > >> Cc: Michael Ellerman <mpe@ellerman.id.au> > >> Cc: Paul Mackerras <paulus@samba.org> > >> Cc: linuxppc-dev@lists.ozlabs.org > >> Cc: linux-kernel@vger.kernel.org > >> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> > >> --- > >> arch/powerpc/Kconfig | 1 + > >> arch/powerpc/include/asm/mman.h | 3 +- > >> arch/powerpc/include/asm/pgtable.h | 19 ------------ > >> arch/powerpc/mm/mmap.c | 47 ++++++++++++++++++++++++++++++ > >> 4 files changed, 49 insertions(+), 21 deletions(-) > >> > >> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > >> index b779603978e1..ddb4a3687c05 100644 > >> --- a/arch/powerpc/Kconfig > >> +++ b/arch/powerpc/Kconfig > >> @@ -135,6 +135,7 @@ config PPC > >> select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST > >> select ARCH_HAS_UACCESS_FLUSHCACHE > >> select ARCH_HAS_UBSAN_SANITIZE_ALL > >> + select ARCH_HAS_VM_GET_PAGE_PROT > >> select ARCH_HAVE_NMI_SAFE_CMPXCHG > >> select ARCH_KEEP_MEMBLOCK > >> select ARCH_MIGHT_HAVE_PC_PARPORT > >> diff --git a/arch/powerpc/include/asm/mman.h b/arch/powerpc/include/asm/mman.h > >> index 7cb6d18f5cd6..7b10c2031e82 100644 > >> --- a/arch/powerpc/include/asm/mman.h > >> +++ b/arch/powerpc/include/asm/mman.h > >> @@ -24,7 +24,7 @@ static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot, > >> } > >> #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey) > >> > >> -static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags) > >> +static inline pgprot_t powerpc_vm_get_page_prot(unsigned long vm_flags) > >> { > >> #ifdef CONFIG_PPC_MEM_KEYS > >> return (vm_flags & VM_SAO) ? > >> @@ -34,7 +34,6 @@ static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags) > >> return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0); > >> #endif > >> } > >> -#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags) > >> > >> static inline bool arch_validate_prot(unsigned long prot, unsigned long addr) > >> { > >> diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h > >> index d564d0ecd4cd..3cbb6de20f9d 100644 > >> --- a/arch/powerpc/include/asm/pgtable.h > >> +++ b/arch/powerpc/include/asm/pgtable.h > >> @@ -20,25 +20,6 @@ struct mm_struct; > >> #include <asm/nohash/pgtable.h> > >> #endif /* !CONFIG_PPC_BOOK3S */ > >> > >> -/* Note due to the way vm flags are laid out, the bits are XWR */ > >> -#define __P000 PAGE_NONE > >> -#define __P001 PAGE_READONLY > >> -#define __P010 PAGE_COPY > >> -#define __P011 PAGE_COPY > >> -#define __P100 PAGE_READONLY_X > >> -#define __P101 PAGE_READONLY_X > >> -#define __P110 PAGE_COPY_X > >> -#define __P111 PAGE_COPY_X > >> - > >> -#define __S000 PAGE_NONE > >> -#define __S001 PAGE_READONLY > >> -#define __S010 PAGE_SHARED > >> -#define __S011 PAGE_SHARED > >> -#define __S100 PAGE_READONLY_X > >> -#define __S101 PAGE_READONLY_X > >> -#define __S110 PAGE_SHARED_X > >> -#define __S111 PAGE_SHARED_X > >> - > >> #ifndef __ASSEMBLY__ > >> > >> #ifndef MAX_PTRS_PER_PGD > >> diff --git a/arch/powerpc/mm/mmap.c b/arch/powerpc/mm/mmap.c > >> index c475cf810aa8..7f05e7903bd2 100644 > >> --- a/arch/powerpc/mm/mmap.c > >> +++ b/arch/powerpc/mm/mmap.c > >> @@ -254,3 +254,50 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) > >> mm->get_unmapped_area = arch_get_unmapped_area_topdown; > >> } > >> } > >> + > >> +static inline pgprot_t __vm_get_page_prot(unsigned long vm_flags) > >> +{ > >> + switch (vm_flags & (VM_READ | VM_WRITE | VM_EXEC | VM_SHARED)) { > >> + case VM_NONE: > >> + return PAGE_NONE; > >> + case VM_READ: > >> + return PAGE_READONLY; > >> + case VM_WRITE: > >> + return PAGE_COPY; > >> + case VM_READ | VM_WRITE: > >> + return PAGE_COPY; > >> + case VM_EXEC: > >> + return PAGE_READONLY_X; > >> + case VM_EXEC | VM_READ: > >> + return PAGE_READONLY_X; > >> + case VM_EXEC | VM_WRITE: > >> + return PAGE_COPY_X; > >> + case VM_EXEC | VM_READ | VM_WRITE: > >> + return PAGE_COPY_X; > >> + case VM_SHARED: > >> + return PAGE_NONE; > >> + case VM_SHARED | VM_READ: > >> + return PAGE_READONLY; > >> + case VM_SHARED | VM_WRITE: > >> + return PAGE_SHARED; > >> + case VM_SHARED | VM_READ | VM_WRITE: > >> + return PAGE_SHARED; > >> + case VM_SHARED | VM_EXEC: > >> + return PAGE_READONLY_X; > >> + case VM_SHARED | VM_EXEC | VM_READ: > >> + return PAGE_READONLY_X; > >> + case VM_SHARED | VM_EXEC | VM_WRITE: > >> + return PAGE_SHARED_X; > >> + case VM_SHARED | VM_EXEC | VM_READ | VM_WRITE: > >> + return PAGE_SHARED_X; > >> + default: > >> + BUILD_BUG(); > >> + } > >> +} > >> + > >> +pgprot_t vm_get_page_prot(unsigned long vm_flags) > >> +{ > >> + return __pgprot(pgprot_val(__vm_get_page_prot(vm_flags)) | > >> + pgprot_val(powerpc_vm_get_page_prot(vm_flags))); > > Any reason to keep powerpc_vm_get_page_prot() rather than open code it > > here? > > > > This applies to other architectures that implement arch_vm_get_page_prot() > > and/or arch_filter_pgprot() as well. > > Just to minimize the code churn ! But I will be happy to open code them > here (and in other platforms) if that will be preferred. I think this will be clearer because all the processing will be at one place. Besides, this way include/asm/pgtable.h becomes shorter and less crowded.
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index b779603978e1..ddb4a3687c05 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -135,6 +135,7 @@ config PPC select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_HAS_UACCESS_FLUSHCACHE select ARCH_HAS_UBSAN_SANITIZE_ALL + select ARCH_HAS_VM_GET_PAGE_PROT select ARCH_HAVE_NMI_SAFE_CMPXCHG select ARCH_KEEP_MEMBLOCK select ARCH_MIGHT_HAVE_PC_PARPORT diff --git a/arch/powerpc/include/asm/mman.h b/arch/powerpc/include/asm/mman.h index 7cb6d18f5cd6..7b10c2031e82 100644 --- a/arch/powerpc/include/asm/mman.h +++ b/arch/powerpc/include/asm/mman.h @@ -24,7 +24,7 @@ static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot, } #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey) -static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags) +static inline pgprot_t powerpc_vm_get_page_prot(unsigned long vm_flags) { #ifdef CONFIG_PPC_MEM_KEYS return (vm_flags & VM_SAO) ? @@ -34,7 +34,6 @@ static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags) return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0); #endif } -#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags) static inline bool arch_validate_prot(unsigned long prot, unsigned long addr) { diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h index d564d0ecd4cd..3cbb6de20f9d 100644 --- a/arch/powerpc/include/asm/pgtable.h +++ b/arch/powerpc/include/asm/pgtable.h @@ -20,25 +20,6 @@ struct mm_struct; #include <asm/nohash/pgtable.h> #endif /* !CONFIG_PPC_BOOK3S */ -/* Note due to the way vm flags are laid out, the bits are XWR */ -#define __P000 PAGE_NONE -#define __P001 PAGE_READONLY -#define __P010 PAGE_COPY -#define __P011 PAGE_COPY -#define __P100 PAGE_READONLY_X -#define __P101 PAGE_READONLY_X -#define __P110 PAGE_COPY_X -#define __P111 PAGE_COPY_X - -#define __S000 PAGE_NONE -#define __S001 PAGE_READONLY -#define __S010 PAGE_SHARED -#define __S011 PAGE_SHARED -#define __S100 PAGE_READONLY_X -#define __S101 PAGE_READONLY_X -#define __S110 PAGE_SHARED_X -#define __S111 PAGE_SHARED_X - #ifndef __ASSEMBLY__ #ifndef MAX_PTRS_PER_PGD diff --git a/arch/powerpc/mm/mmap.c b/arch/powerpc/mm/mmap.c index c475cf810aa8..7f05e7903bd2 100644 --- a/arch/powerpc/mm/mmap.c +++ b/arch/powerpc/mm/mmap.c @@ -254,3 +254,50 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) mm->get_unmapped_area = arch_get_unmapped_area_topdown; } } + +static inline pgprot_t __vm_get_page_prot(unsigned long vm_flags) +{ + switch (vm_flags & (VM_READ | VM_WRITE | VM_EXEC | VM_SHARED)) { + case VM_NONE: + return PAGE_NONE; + case VM_READ: + return PAGE_READONLY; + case VM_WRITE: + return PAGE_COPY; + case VM_READ | VM_WRITE: + return PAGE_COPY; + case VM_EXEC: + return PAGE_READONLY_X; + case VM_EXEC | VM_READ: + return PAGE_READONLY_X; + case VM_EXEC | VM_WRITE: + return PAGE_COPY_X; + case VM_EXEC | VM_READ | VM_WRITE: + return PAGE_COPY_X; + case VM_SHARED: + return PAGE_NONE; + case VM_SHARED | VM_READ: + return PAGE_READONLY; + case VM_SHARED | VM_WRITE: + return PAGE_SHARED; + case VM_SHARED | VM_READ | VM_WRITE: + return PAGE_SHARED; + case VM_SHARED | VM_EXEC: + return PAGE_READONLY_X; + case VM_SHARED | VM_EXEC | VM_READ: + return PAGE_READONLY_X; + case VM_SHARED | VM_EXEC | VM_WRITE: + return PAGE_SHARED_X; + case VM_SHARED | VM_EXEC | VM_READ | VM_WRITE: + return PAGE_SHARED_X; + default: + BUILD_BUG(); + } +} + +pgprot_t vm_get_page_prot(unsigned long vm_flags) +{ + return __pgprot(pgprot_val(__vm_get_page_prot(vm_flags)) | + pgprot_val(powerpc_vm_get_page_prot(vm_flags))); +} +EXPORT_SYMBOL(vm_get_page_prot);
This defines and exports a platform specific custom vm_get_page_prot() via subscribing ARCH_HAS_VM_GET_PAGE_PROT. Subsequently all __SXXX and __PXXX macros can be dropped which are no longer needed. While here, this also localizes arch_vm_get_page_prot() as powerpc_vm_get_page_prot(). Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paul Mackerras <paulus@samba.org> Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> --- arch/powerpc/Kconfig | 1 + arch/powerpc/include/asm/mman.h | 3 +- arch/powerpc/include/asm/pgtable.h | 19 ------------ arch/powerpc/mm/mmap.c | 47 ++++++++++++++++++++++++++++++ 4 files changed, 49 insertions(+), 21 deletions(-)