diff mbox series

[v2,4/5] arm64: Add support for arch_memremap_ro()

Message ID 20190614203717.75479-5-swboyd@chromium.org (mailing list archive)
State New, archived
Headers show
Series Read-only memremap() | expand

Commit Message

Stephen Boyd June 14, 2019, 8:37 p.m. UTC 
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>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
---
 arch/arm64/include/asm/io.h | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index b807cb9b517d..cc33f4c8647b 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -183,6 +183,7 @@  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
 
 /*