[PATCH] Allow struct members inside percpu macros

The current percpu macros do not allow __get_cpu_var(foo.val1)
which makes building macros on top of them really difficult.  The
reason for this is the __per_cpu postfix appended to per-cpu
variables, designed to catch direct uses.  Prepend it instead.

include/asm-generic/percpu.h

@@ -9,10 +9,10 @@ extern unsigned long __per_cpu_offset[NR_CPUS];
 
 /* Separate out the type, so (int[3], foo) works. */
 #define DEFINE_PER_CPU(type, name) \
-    __attribute__((__section__(".data.percpu"))) __typeof__(type) name##__per_cpu
+    __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
 
 /* var is in discarded region: offset to particular copy we want */
-#define per_cpu(var, cpu) (*RELOC_HIDE(&var##__per_cpu, __per_cpu_offset[cpu]))
+#define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]))
 #define __get_cpu_var(var) per_cpu(var, smp_processor_id())
 
 static inline void percpu_modcopy(void *pcpudst, const void *src,
@@ -26,16 +26,16 @@ static inline void percpu_modcopy(void *pcpudst, const void *src,
 #else /* ! SMP */
 
 #define DEFINE_PER_CPU(type, name) \
-    __typeof__(type) name##__per_cpu
+    __typeof__(type) per_cpu__##name
 
-#define per_cpu(var, cpu)			((void)cpu, var##__per_cpu)
-#define __get_cpu_var(var)			var##__per_cpu
+#define per_cpu(var, cpu)			((void)cpu, per_cpu__##var)
+#define __get_cpu_var(var)			per_cpu__##var
 
 #endif	/* SMP */
 
-#define DECLARE_PER_CPU(type, name) extern __typeof__(type) name##__per_cpu
+#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
 
-#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(var##__per_cpu)
-#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(var##__per_cpu)
+#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
+#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
 
 #endif /* _ASM_GENERIC_PERCPU_H_ */