| Message ID | 1643029028-12710-26-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 1/24/22 06:57, 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. > > Cc: Dinh Nguyen <dinguyen@kernel.org> > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> > --- > arch/nios2/Kconfig | 1 + > arch/nios2/include/asm/pgtable.h | 16 ------------- > arch/nios2/mm/init.c | 41 ++++++++++++++++++++++++++++++++ > 3 files changed, 42 insertions(+), 16 deletions(-) > > diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig > index 33fd06f5fa41..85a58a357a3b 100644 > --- a/arch/nios2/Kconfig > +++ b/arch/nios2/Kconfig > @@ -6,6 +6,7 @@ config NIOS2 > select ARCH_HAS_SYNC_DMA_FOR_CPU > select ARCH_HAS_SYNC_DMA_FOR_DEVICE > select ARCH_HAS_DMA_SET_UNCACHED > + select ARCH_HAS_VM_GET_PAGE_PROT > select ARCH_NO_SWAP > select COMMON_CLK > select TIMER_OF > diff --git a/arch/nios2/include/asm/pgtable.h b/arch/nios2/include/asm/pgtable.h > index 4a995fa628ee..2678dad58a63 100644 > --- a/arch/nios2/include/asm/pgtable.h > +++ b/arch/nios2/include/asm/pgtable.h > @@ -40,24 +40,8 @@ struct mm_struct; > */ > > /* Remove W bit on private pages for COW support */ > -#define __P000 MKP(0, 0, 0) > -#define __P001 MKP(0, 0, 1) > -#define __P010 MKP(0, 0, 0) /* COW */ > -#define __P011 MKP(0, 0, 1) /* COW */ > -#define __P100 MKP(1, 0, 0) > -#define __P101 MKP(1, 0, 1) > -#define __P110 MKP(1, 0, 0) /* COW */ > -#define __P111 MKP(1, 0, 1) /* COW */ > > /* Shared pages can have exact HW mapping */ > -#define __S000 MKP(0, 0, 0) > -#define __S001 MKP(0, 0, 1) > -#define __S010 MKP(0, 1, 0) > -#define __S011 MKP(0, 1, 1) > -#define __S100 MKP(1, 0, 0) > -#define __S101 MKP(1, 0, 1) > -#define __S110 MKP(1, 1, 0) > -#define __S111 MKP(1, 1, 1) > > /* Used all over the kernel */ > #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \ > diff --git a/arch/nios2/mm/init.c b/arch/nios2/mm/init.c > index 613fcaa5988a..4f8251e62f31 100644 > --- a/arch/nios2/mm/init.c > +++ b/arch/nios2/mm/init.c > @@ -124,3 +124,44 @@ const char *arch_vma_name(struct vm_area_struct *vma) > { > return (vma->vm_start == KUSER_BASE) ? "[kuser]" : NULL; > } > + > +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 MKP(0, 0, 0); > + case VM_READ: > + return MKP(0, 0, 1); > + case VM_WRITE: > + return MKP(0, 0, 0); > + case VM_READ | VM_WRITE: > + return MKP(0, 0, 1); > + case VM_EXEC: > + return MKP(1, 0, 0); > + case VM_EXEC | VM_READ: > + return MKP(1, 0, 1); > + case VM_EXEC | VM_WRITE: > + return MKP(1, 0, 0); > + case VM_EXEC | VM_READ | VM_WRITE: > + return MKP(1, 0, 1); > + case VM_SHARED: > + return MKP(0, 0, 0); > + case VM_SHARED | VM_READ: > + return MKP(0, 0, 1); > + case VM_SHARED | VM_WRITE: > + return MKP(0, 1, 0); > + case VM_SHARED | VM_READ | VM_WRITE: > + return MKP(0, 1, 1); > + case VM_SHARED | VM_EXEC: > + return MKP(1, 0, 0); > + case VM_SHARED | VM_EXEC | VM_READ: > + return MKP(1, 0, 1); > + case VM_SHARED | VM_EXEC | VM_WRITE: > + return MKP(1, 1, 0); > + case VM_SHARED | VM_EXEC | VM_READ | VM_WRITE: > + return MKP(1, 1, 1); > + default: > + BUILD_BUG(); > + } > +} > +EXPORT_SYMBOL(vm_get_page_prot); Acked-by: Dinh Nguyen <dinguyen@kernel.org>
diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig index 33fd06f5fa41..85a58a357a3b 100644 --- a/arch/nios2/Kconfig +++ b/arch/nios2/Kconfig @@ -6,6 +6,7 @@ config NIOS2 select ARCH_HAS_SYNC_DMA_FOR_CPU select ARCH_HAS_SYNC_DMA_FOR_DEVICE select ARCH_HAS_DMA_SET_UNCACHED + select ARCH_HAS_VM_GET_PAGE_PROT select ARCH_NO_SWAP select COMMON_CLK select TIMER_OF diff --git a/arch/nios2/include/asm/pgtable.h b/arch/nios2/include/asm/pgtable.h index 4a995fa628ee..2678dad58a63 100644 --- a/arch/nios2/include/asm/pgtable.h +++ b/arch/nios2/include/asm/pgtable.h @@ -40,24 +40,8 @@ struct mm_struct; */ /* Remove W bit on private pages for COW support */ -#define __P000 MKP(0, 0, 0) -#define __P001 MKP(0, 0, 1) -#define __P010 MKP(0, 0, 0) /* COW */ -#define __P011 MKP(0, 0, 1) /* COW */ -#define __P100 MKP(1, 0, 0) -#define __P101 MKP(1, 0, 1) -#define __P110 MKP(1, 0, 0) /* COW */ -#define __P111 MKP(1, 0, 1) /* COW */ /* Shared pages can have exact HW mapping */ -#define __S000 MKP(0, 0, 0) -#define __S001 MKP(0, 0, 1) -#define __S010 MKP(0, 1, 0) -#define __S011 MKP(0, 1, 1) -#define __S100 MKP(1, 0, 0) -#define __S101 MKP(1, 0, 1) -#define __S110 MKP(1, 1, 0) -#define __S111 MKP(1, 1, 1) /* Used all over the kernel */ #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \ diff --git a/arch/nios2/mm/init.c b/arch/nios2/mm/init.c index 613fcaa5988a..4f8251e62f31 100644 --- a/arch/nios2/mm/init.c +++ b/arch/nios2/mm/init.c @@ -124,3 +124,44 @@ const char *arch_vma_name(struct vm_area_struct *vma) { return (vma->vm_start == KUSER_BASE) ? "[kuser]" : NULL; } + +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 MKP(0, 0, 0); + case VM_READ: + return MKP(0, 0, 1); + case VM_WRITE: + return MKP(0, 0, 0); + case VM_READ | VM_WRITE: + return MKP(0, 0, 1); + case VM_EXEC: + return MKP(1, 0, 0); + case VM_EXEC | VM_READ: + return MKP(1, 0, 1); + case VM_EXEC | VM_WRITE: + return MKP(1, 0, 0); + case VM_EXEC | VM_READ | VM_WRITE: + return MKP(1, 0, 1); + case VM_SHARED: + return MKP(0, 0, 0); + case VM_SHARED | VM_READ: + return MKP(0, 0, 1); + case VM_SHARED | VM_WRITE: + return MKP(0, 1, 0); + case VM_SHARED | VM_READ | VM_WRITE: + return MKP(0, 1, 1); + case VM_SHARED | VM_EXEC: + return MKP(1, 0, 0); + case VM_SHARED | VM_EXEC | VM_READ: + return MKP(1, 0, 1); + case VM_SHARED | VM_EXEC | VM_WRITE: + return MKP(1, 1, 0); + case VM_SHARED | VM_EXEC | VM_READ | VM_WRITE: + return MKP(1, 1, 1); + default: + BUILD_BUG(); + } +} +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. Cc: Dinh Nguyen <dinguyen@kernel.org> Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> --- arch/nios2/Kconfig | 1 + arch/nios2/include/asm/pgtable.h | 16 ------------- arch/nios2/mm/init.c | 41 ++++++++++++++++++++++++++++++++ 3 files changed, 42 insertions(+), 16 deletions(-)