[PATCH] percpu: create an EXPORT_PER_CPU_SYMBOL() macro

This is needed so that per-cpu information in the core kernel can be
accessed from modules.

include/asm-generic/percpu.h

@@ -27,8 +27,12 @@ extern unsigned long __per_cpu_offset[NR_CPUS];
 
 #define per_cpu(var, cpu)			((void)cpu, var##__per_cpu)
 #define __get_cpu_var(var)			var##__per_cpu
-#endif
+
+#endif	/* SMP */
 
 #define DECLARE_PER_CPU(type, name) extern __typeof__(type) name##__per_cpu
 
+#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(var##__per_cpu)
+#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(var##__per_cpu)
+
 #endif /* _ASM_GENERIC_PERCPU_H_ */

include/asm-ia64/percpu.h

@@ -32,6 +32,9 @@ extern unsigned long __per_cpu_offset[NR_CPUS];
 # define per_cpu(var, cpu)	((void)cpu, __get_cpu_var(var))
 #endif
 
+#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(var##__per_cpu)
+#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(var##__per_cpu)
+
 #endif /* !__ASSEMBLY__ */
 
 #endif /* _ASM_IA64_PERCPU_H */

include/asm-x86_64/percpu.h

@@ -42,4 +42,7 @@ extern unsigned long __per_cpu_offset[NR_CPUS];
 
 extern void setup_per_cpu_areas(void);
 
+#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(var##__per_cpu)
+#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(var##__per_cpu)
+
 #endif /* _ASM_X8664_PERCPU_H_ */