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    Subject[RFC/PATCH 4/5] arm64: Add support for arch_memremap_ro()
    Date
    Pass in PAGE_KERNEL_RO to the underlying IO mapping mechanism to get a
    read-only mapping for the MEMREMAP_RO type of memory mappings that
    memremap() supports.

    Cc: Evan Green <evgreen@chromium.org>
    Cc: Rob Herring <robh+dt@kernel.org>
    Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
    Cc: Andy Gross <agross@kernel.org>
    Cc: Will Deacon <will.deacon@arm.com>
    Cc: Catalin Marinas <catalin.marinas@arm.com>
    Cc: Dan Williams <dan.j.williams@intel.com>
    Signed-off-by: Stephen Boyd <swboyd@chromium.org>
    ---
    arch/arm64/include/asm/io.h | 1 +
    1 file changed, 1 insertion(+)

    diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
    index 8bb7210ac286..245bd371e8dc 100644
    --- a/arch/arm64/include/asm/io.h
    +++ b/arch/arm64/include/asm/io.h
    @@ -185,6 +185,7 @@ extern void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size);
    #define ioremap_nocache(addr, size) __ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE))
    #define ioremap_wc(addr, size) __ioremap((addr), (size), __pgprot(PROT_NORMAL_NC))
    #define ioremap_wt(addr, size) __ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE))
    +#define arch_memremap_ro(addr, size) __ioremap((addr), (size), PAGE_KERNEL_RO)
    #define iounmap __iounmap

    /*
    --
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