tools/include/linux/export.h - third_party/kernel - Git at Google

 #ifndef _TOOLS_LINUX_EXPORT_H_
 #define _TOOLS_LINUX_EXPORT_H_

 #define EXPORT_SYMBOL(sym)
 #define EXPORT_SYMBOL_GPL(sym)
 #define EXPORT_SYMBOL_GPL_FUTURE(sym)
 #define EXPORT_UNUSED_SYMBOL(sym)
 #define EXPORT_UNUSED_SYMBOL_GPL(sym)

 #endif
	#ifndef _TOOLS_LINUX_EXPORT_H_
	#define _TOOLS_LINUX_EXPORT_H_

	#define EXPORT_SYMBOL(sym)
	#define EXPORT_SYMBOL_GPL(sym)
	#define EXPORT_SYMBOL_GPL_FUTURE(sym)
	#define EXPORT_UNUSED_SYMBOL(sym)
	#define EXPORT_UNUSED_SYMBOL_GPL(sym)

	#endif