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    Subject[PATCH V4 02/26] mm/mmap: Define DECLARE_VM_GET_PAGE_PROT
    Date
    This just converts the generic vm_get_page_prot() implementation into a new
    macro i.e DECLARE_VM_GET_PAGE_PROT which later can be used across platforms
    when enabling them with ARCH_HAS_VM_GET_PAGE_PROT. This does not create any
    functional change.

    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: linux-mm@kvack.org
    Cc: linux-kernel@vger.kernel.org
    Suggested-by: Christoph Hellwig <hch@infradead.org>
    Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
    ---
    include/linux/mm.h | 8 ++++++++
    mm/mmap.c | 6 +-----
    2 files changed, 9 insertions(+), 5 deletions(-)

    diff --git a/include/linux/mm.h b/include/linux/mm.h
    index 47bfe038d46e..237828c2bae2 100644
    --- a/include/linux/mm.h
    +++ b/include/linux/mm.h
    @@ -428,6 +428,14 @@ extern unsigned int kobjsize(const void *objp);
    extern pgprot_t protection_map[16];
    #endif

    +#define DECLARE_VM_GET_PAGE_PROT \
    +pgprot_t vm_get_page_prot(unsigned long vm_flags) \
    +{ \
    + return protection_map[vm_flags & \
    + (VM_READ | VM_WRITE | VM_EXEC | VM_SHARED)]; \
    +} \
    +EXPORT_SYMBOL(vm_get_page_prot);
    +
    /*
    * The default fault flags that should be used by most of the
    * arch-specific page fault handlers.
    diff --git a/mm/mmap.c b/mm/mmap.c
    index b01f0280bda2..55c30aee3999 100644
    --- a/mm/mmap.c
    +++ b/mm/mmap.c
    @@ -123,11 +123,7 @@ pgprot_t protection_map[16] __ro_after_init = {
    #endif

    #ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT
    -pgprot_t vm_get_page_prot(unsigned long vm_flags)
    -{
    - return protection_map[vm_flags & (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)];
    -}
    -EXPORT_SYMBOL(vm_get_page_prot);
    +DECLARE_VM_GET_PAGE_PROT
    #endif /* CONFIG_ARCH_HAS_VM_GET_PAGE_PROT */

    static pgprot_t vm_pgprot_modify(pgprot_t oldprot, unsigned long vm_flags)
    --
    2.25.1
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