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Subject[PATCH] ARM: fix type of PHYS_PFN_OFFSET to unsigned long
On LPAE machines, PHYS_OFFSET evaluates to a phys_addr_t and this type is
inherited by the PHYS_PFN_OFFSET definition as well. Consequently, the kernel
build emits warnings of the form:

init/main.c: In function 'start_kernel':
init/main.c:588:7: warning: format '%lx' expects argument of type 'long unsigned int', but argument 2 has type 'phys_addr_t' [-Wformat]

This patch fixes this warning by pinning down the PFN type to unsigned long.

Signed-off-by: Cyril Chemparathy <>
arch/arm/include/asm/memory.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index 73cf03a..632dc23 100644
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -207,7 +207,7 @@ static inline unsigned long __phys_to_virt(unsigned long x)
* direct-mapped view. We assume this is the first page
* of RAM in the mem_map as well.
+#define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))

* These are *only* valid on the kernel direct mapped RAM memory.

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