1 files changed, 8 insertions, 1 deletions

diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index 4dd21457ef9d..9ecccc865046 100644
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -226,7 +226,14 @@ static inline phys_addr_t __virt_to_phys(unsigned long x)
 static inline unsigned long __phys_to_virt(phys_addr_t x)
 {
         unsigned long t;
-        __pv_stub(x, t, "sub", __PV_BITS_31_24);
+
+        /*
+         * 'unsigned long' cast discard upper word when
+         * phys_addr_t is 64 bit, and makes sure that inline
+         * assembler expression receives 32 bit argument
+         * in place where 'r' 32 bit operand is expected.
+         */
+        __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24);
         return t;
 }