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    Subject[RFC V1 18/31] arc/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: Vineet Gupta <vgupta@kernel.org>
    Cc: linux-snps-arc@lists.infradead.org
    Cc: linux-kernel@vger.kernel.org
    Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
    ---
    arch/arc/Kconfig | 1 +
    arch/arc/include/asm/pgtable-bits-arcv2.h | 17 ----------
    arch/arc/mm/mmap.c | 41 +++++++++++++++++++++++
    3 files changed, 42 insertions(+), 17 deletions(-)

    diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
    index 3c2a4753d09b..78ff0644b343 100644
    --- a/arch/arc/Kconfig
    +++ b/arch/arc/Kconfig
    @@ -13,6 +13,7 @@ config ARC
    select ARCH_HAS_SETUP_DMA_OPS
    select ARCH_HAS_SYNC_DMA_FOR_CPU
    select ARCH_HAS_SYNC_DMA_FOR_DEVICE
    + select ARCH_HAS_VM_GET_PAGE_PROT
    select ARCH_SUPPORTS_ATOMIC_RMW if ARC_HAS_LLSC
    select ARCH_32BIT_OFF_T
    select BUILDTIME_TABLE_SORT
    diff --git a/arch/arc/include/asm/pgtable-bits-arcv2.h b/arch/arc/include/asm/pgtable-bits-arcv2.h
    index 183d23bc1e00..798308f4dbad 100644
    --- a/arch/arc/include/asm/pgtable-bits-arcv2.h
    +++ b/arch/arc/include/asm/pgtable-bits-arcv2.h
    @@ -72,23 +72,6 @@
    * This is to enable COW mechanism
    */
    /* xwr */
    -#define __P000 PAGE_U_NONE
    -#define __P001 PAGE_U_R
    -#define __P010 PAGE_U_R /* Pvt-W => !W */
    -#define __P011 PAGE_U_R /* Pvt-W => !W */
    -#define __P100 PAGE_U_X_R /* X => R */
    -#define __P101 PAGE_U_X_R
    -#define __P110 PAGE_U_X_R /* Pvt-W => !W and X => R */
    -#define __P111 PAGE_U_X_R /* Pvt-W => !W */
    -
    -#define __S000 PAGE_U_NONE
    -#define __S001 PAGE_U_R
    -#define __S010 PAGE_U_W_R /* W => R */
    -#define __S011 PAGE_U_W_R
    -#define __S100 PAGE_U_X_R /* X => R */
    -#define __S101 PAGE_U_X_R
    -#define __S110 PAGE_U_X_W_R /* X => R */
    -#define __S111 PAGE_U_X_W_R

    #ifndef __ASSEMBLY__

    diff --git a/arch/arc/mm/mmap.c b/arch/arc/mm/mmap.c
    index 722d26b94307..860b2fc91f55 100644
    --- a/arch/arc/mm/mmap.c
    +++ b/arch/arc/mm/mmap.c
    @@ -74,3 +74,44 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
    info.align_offset = pgoff << PAGE_SHIFT;
    return vm_unmapped_area(&info);
    }
    +
    +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_U_NONE;
    + case VM_READ:
    + return PAGE_U_R;
    + case VM_WRITE:
    + return PAGE_U_R;
    + case VM_READ | VM_WRITE:
    + return PAGE_U_R;
    + case VM_EXEC:
    + return PAGE_U_X_R;
    + case VM_EXEC | VM_READ:
    + return PAGE_U_X_R;
    + case VM_EXEC | VM_WRITE:
    + return PAGE_U_X_R;
    + case VM_EXEC | VM_READ | VM_WRITE:
    + return PAGE_U_X_R;
    + case VM_SHARED:
    + return PAGE_U_NONE;
    + case VM_SHARED | VM_READ:
    + return PAGE_U_R;
    + case VM_SHARED | VM_WRITE:
    + return PAGE_U_W_R;
    + case VM_SHARED | VM_READ | VM_WRITE:
    + return PAGE_U_W_R;
    + case VM_SHARED | VM_EXEC:
    + return PAGE_U_X_R;
    + case VM_SHARED | VM_EXEC | VM_READ:
    + return PAGE_U_X_R;
    + case VM_SHARED | VM_EXEC | VM_WRITE:
    + return PAGE_U_X_W_R;
    + case VM_SHARED | VM_EXEC | VM_READ | VM_WRITE:
    + return PAGE_U_X_W_R;
    + default:
    + BUILD_BUG();
    + }
    +}
    +EXPORT_SYMBOL(vm_get_page_prot);
    --
    2.25.1
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