diff --git a/include/asm-arm/arch-pxa/hardware.h b/include/asm-arm/arch-pxa/hardware.h
index ab2d963e742a46c26185c7358e8ad28a0438ee51..e25558faa5a480f7b2c2fa78d444244e071e9ae6 100644
--- a/include/asm-arm/arch-pxa/hardware.h
+++ b/include/asm-arm/arch-pxa/hardware.h
@@ -121,38 +121,32 @@
 
 #define cpu_is_pxa21x()					\
 	({						\
-		unsigned int id = read_cpuid(CPUID_ID);	\
-		__cpu_is_pxa21x(id);			\
+		__cpu_is_pxa21x(read_cpuid_id());	\
 	})
 
 #define cpu_is_pxa25x()					\
 	({						\
-		unsigned int id = read_cpuid(CPUID_ID);	\
-		__cpu_is_pxa25x(id);			\
+		__cpu_is_pxa25x(read_cpuid_id());	\
 	})
 
 #define cpu_is_pxa27x()					\
 	({						\
-		unsigned int id = read_cpuid(CPUID_ID);	\
-		__cpu_is_pxa27x(id);			\
+		__cpu_is_pxa27x(read_cpuid_id());	\
 	})
 
 #define cpu_is_pxa300()					\
 	({						\
-		unsigned int id = read_cpuid(CPUID_ID);	\
-		__cpu_is_pxa300(id);			\
+		__cpu_is_pxa300(read_cpuid_id());	\
 	 })
 
 #define cpu_is_pxa310()					\
 	({						\
-		unsigned int id = read_cpuid(CPUID_ID);	\
-		__cpu_is_pxa310(id);			\
+		__cpu_is_pxa310(read_cpuid_id());	\
 	 })
 
 #define cpu_is_pxa320()					\
 	({						\
-		unsigned int id = read_cpuid(CPUID_ID);	\
-		__cpu_is_pxa320(id);			\
+		__cpu_is_pxa320(read_cpuid_id());	\
 	 })
 
 /*
@@ -174,14 +168,12 @@
 
 #define cpu_is_pxa2xx()					\
 	({						\
-		unsigned int id = read_cpuid(CPUID_ID);	\
-		__cpu_is_pxa2xx(id);			\
+		__cpu_is_pxa2xx(read_cpuid_id());	\
 	 })
 
 #define cpu_is_pxa3xx()					\
 	({						\
-		unsigned int id = read_cpuid(CPUID_ID);	\
-		__cpu_is_pxa3xx(id);			\
+		__cpu_is_pxa3xx(read_cpuid_id());	\
 	 })
 
 /*
diff --git a/include/asm-arm/system.h b/include/asm-arm/system.h
index 94ea8c6dc1a4485014fd9bb8fbd7c29078e69696..28425c473e71c72c7a959f6650fc6707a89d6b0e 100644
--- a/include/asm-arm/system.h
+++ b/include/asm-arm/system.h
@@ -75,8 +75,21 @@
 #ifndef __ASSEMBLY__
 
 #include <linux/linkage.h>
+#include <linux/stringify.h>
 #include <linux/irqflags.h>
 
+/*
+ * The CPU ID never changes at run time, so we might as well tell the
+ * compiler that it's constant.  Use this function to read the CPU ID
+ * rather than directly reading processor_id or read_cpuid() directly.
+ */
+static inline unsigned int read_cpuid_id(void) __attribute_const__;
+
+static inline unsigned int read_cpuid_id(void)
+{
+	return read_cpuid(CPUID_ID);
+}
+
 #define __exception	__attribute__((section(".exception.text")))
 
 struct thread_info;