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Subject[RFC/PATCH 4/5] arm64: Add support for arch_memremap_ro()
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 <>
Cc: Rob Herring <>
Cc: Bjorn Andersson <>
Cc: Andy Gross <>
Cc: Will Deacon <>
Cc: Catalin Marinas <>
Cc: Dan Williams <>
Signed-off-by: Stephen Boyd <>
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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