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    Subject[PATCH 13/16] x86: make /dev/mem mappings _PAGE_IOMAP
    Date
    From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

    Impact: allow hardware to be mapped via /dev/mem

    Use _PAGE_IOMAP on /dev/mem mappings.

    Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
    ---
    arch/x86/mm/pat.c | 2 +-
    1 files changed, 1 insertions(+), 1 deletions(-)

    diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
    index 4d2a4df..56899ae 100644
    --- a/arch/x86/mm/pat.c
    +++ b/arch/x86/mm/pat.c
    @@ -504,7 +504,7 @@ int free_memtype(u64 start, u64 end)
    pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
    unsigned long size, pgprot_t vma_prot)
    {
    - return vma_prot;
    + return __pgprot(pgprot_val(vma_prot) | _PAGE_IOMAP);
    }

    #ifdef CONFIG_STRICT_DEVMEM
    --
    1.6.0.6


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