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    Subject[RFC V1 16/31] alpha/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT
    Date
    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: Richard Henderson <rth@twiddle.net>
    Cc: linux-alpha@vger.kernel.org
    Cc: linux-kernel@vger.kernel.org
    Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
    ---
    arch/alpha/Kconfig | 1 +
    arch/alpha/include/asm/pgtable.h | 17 -------------
    arch/alpha/mm/init.c | 41 ++++++++++++++++++++++++++++++++
    3 files changed, 42 insertions(+), 17 deletions(-)

    diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
    index 4e87783c90ad..73e82fe5c770 100644
    --- a/arch/alpha/Kconfig
    +++ b/arch/alpha/Kconfig
    @@ -2,6 +2,7 @@
    config ALPHA
    bool
    default y
    + select ARCH_HAS_VM_GET_PAGE_PROT
    select ARCH_32BIT_USTAT_F_TINODE
    select ARCH_MIGHT_HAVE_PC_PARPORT
    select ARCH_MIGHT_HAVE_PC_SERIO
    diff --git a/arch/alpha/include/asm/pgtable.h b/arch/alpha/include/asm/pgtable.h
    index 02f0429f1068..9fb5e9d10bb6 100644
    --- a/arch/alpha/include/asm/pgtable.h
    +++ b/arch/alpha/include/asm/pgtable.h
    @@ -116,23 +116,6 @@ struct vm_area_struct;
    * arch/alpha/mm/fault.c)
    */
    /* xwr */
    -#define __P000 _PAGE_P(_PAGE_FOE | _PAGE_FOW | _PAGE_FOR)
    -#define __P001 _PAGE_P(_PAGE_FOE | _PAGE_FOW)
    -#define __P010 _PAGE_P(_PAGE_FOE)
    -#define __P011 _PAGE_P(_PAGE_FOE)
    -#define __P100 _PAGE_P(_PAGE_FOW | _PAGE_FOR)
    -#define __P101 _PAGE_P(_PAGE_FOW)
    -#define __P110 _PAGE_P(0)
    -#define __P111 _PAGE_P(0)
    -
    -#define __S000 _PAGE_S(_PAGE_FOE | _PAGE_FOW | _PAGE_FOR)
    -#define __S001 _PAGE_S(_PAGE_FOE | _PAGE_FOW)
    -#define __S010 _PAGE_S(_PAGE_FOE)
    -#define __S011 _PAGE_S(_PAGE_FOE)
    -#define __S100 _PAGE_S(_PAGE_FOW | _PAGE_FOR)
    -#define __S101 _PAGE_S(_PAGE_FOW)
    -#define __S110 _PAGE_S(0)
    -#define __S111 _PAGE_S(0)

    /*
    * pgprot_noncached() is only for infiniband pci support, and a real
    diff --git a/arch/alpha/mm/init.c b/arch/alpha/mm/init.c
    index f6114d03357c..89e5e593194d 100644
    --- a/arch/alpha/mm/init.c
    +++ b/arch/alpha/mm/init.c
    @@ -280,3 +280,44 @@ mem_init(void)
    high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
    memblock_free_all();
    }
    +
    +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_P(_PAGE_FOE|_PAGE_FOW|_PAGE_FOR);
    + case VM_READ:
    + return _PAGE_P(_PAGE_FOE|_PAGE_FOW);
    + case VM_WRITE:
    + return _PAGE_P(_PAGE_FOE);
    + case VM_READ | VM_WRITE:
    + return _PAGE_P(_PAGE_FOE);
    + case VM_EXEC:
    + return _PAGE_P(_PAGE_FOW|_PAGE_FOR);
    + case VM_EXEC | VM_READ:
    + return _PAGE_P(_PAGE_FOW);
    + case VM_EXEC | VM_WRITE:
    + return _PAGE_P(0);
    + case VM_EXEC | VM_READ | VM_WRITE:
    + return _PAGE_P(0);
    + case VM_SHARED:
    + return _PAGE_S(_PAGE_FOE|_PAGE_FOW|_PAGE_FOR);
    + case VM_SHARED | VM_READ:
    + return _PAGE_S(_PAGE_FOE|_PAGE_FOW);
    + case VM_SHARED | VM_WRITE:
    + return _PAGE_S(_PAGE_FOE);
    + case VM_SHARED | VM_READ | VM_WRITE:
    + return _PAGE_S(_PAGE_FOE);
    + case VM_SHARED | VM_EXEC:
    + return _PAGE_S(_PAGE_FOW|_PAGE_FOR);
    + case VM_SHARED | VM_EXEC | VM_READ:
    + return _PAGE_S(_PAGE_FOW);
    + case VM_SHARED | VM_EXEC | VM_WRITE:
    + return _PAGE_S(0);
    + case VM_SHARED | VM_EXEC | VM_READ | VM_WRITE:
    + return _PAGE_S(0);
    + default:
    + BUILD_BUG();
    + }
    +}
    +EXPORT_SYMBOL(vm_get_page_prot);
    --
    2.25.1
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