#ifndef _LINUX_EXPORT_H
  #define _LINUX_EXPORT_H

  /*
   * Export symbols from the kernel to modules.  Forked from module.h
   * to reduce the amount of pointless cruft we feed to gcc when only
   * exporting a simple symbol or two.
   *

   * Try not to add #includes here.  It slows compilation and makes kernel
   * hackers place grumpy comments in header files.

   */
  
  /* Some toolchains use a `_' prefix for all user symbols. */

  #ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
  #define __VMLINUX_SYMBOL(x) _##x
  #define __VMLINUX_SYMBOL_STR(x) "_" #x

  #else

  #define __VMLINUX_SYMBOL(x) x
  #define __VMLINUX_SYMBOL_STR(x) #x

  #endif

  /* Indirect, so macros are expanded before pasting. */
  #define VMLINUX_SYMBOL(x) __VMLINUX_SYMBOL(x)
  #define VMLINUX_SYMBOL_STR(x) __VMLINUX_SYMBOL_STR(x)
  
  #ifndef __ASSEMBLY__

  struct kernel_symbol
  {
  	unsigned long value;
  	const char *name;
  };
  
  #ifdef MODULE
  extern struct module __this_module;
  #define THIS_MODULE (&__this_module)
  #else
  #define THIS_MODULE ((struct module *)0)
  #endif
  
  #ifdef CONFIG_MODULES

  #if defined(__KERNEL__) && !defined(__GENKSYMS__)

  #ifdef CONFIG_MODVERSIONS
  /* Mark the CRC weak since genksyms apparently decides not to
   * generate a checksums for some symbols */

  #define __CRC_SYMBOL(sym, sec)						\
  	extern __visible void *__crc_##sym __attribute__((weak));	\
  	static const unsigned long __kcrctab_##sym			\
  	__used								\
  	__attribute__((section("___kcrctab" sec "+" #sym), used))	\

  	= (unsigned long) &__crc_##sym;
  #else
  #define __CRC_SYMBOL(sym, sec)
  #endif
  
  /* For every exported symbol, place a struct in the __ksymtab section */

  #define ___EXPORT_SYMBOL(sym, sec)					\
  	extern typeof(sym) sym;						\
  	__CRC_SYMBOL(sym, sec)						\
  	static const char __kstrtab_##sym[]				\
  	__attribute__((section("__ksymtab_strings"), aligned(1)))	\
  	= VMLINUX_SYMBOL_STR(sym);					\
  	static const struct kernel_symbol __ksymtab_##sym		\
  	__used								\
  	__attribute__((section("___ksymtab" sec "+" #sym), used))	\

  	= { (unsigned long)&sym, __kstrtab_##sym }

  #if defined(__KSYM_DEPS__)
  
  /*
   * For fine grained build dependencies, we want to tell the build system
   * about each possible exported symbol even if they're not actually exported.
   * We use a string pattern that is unlikely to be valid code that the build
   * system filters out from the preprocessor output (see ksym_dep_filter
   * in scripts/Kbuild.include).
   */
  #define __EXPORT_SYMBOL(sym, sec)	=== __KSYM_##sym ===
  
  #elif defined(CONFIG_TRIM_UNUSED_KSYMS)

  #include <generated/autoksyms.h>
  
  #define __EXPORT_SYMBOL(sym, sec)				\

  	__cond_export_sym(sym, sec, __is_defined(__KSYM_##sym))

  #define __cond_export_sym(sym, sec, conf)			\
  	___cond_export_sym(sym, sec, conf)
  #define ___cond_export_sym(sym, sec, enabled)			\
  	__cond_export_sym_##enabled(sym, sec)
  #define __cond_export_sym_1(sym, sec) ___EXPORT_SYMBOL(sym, sec)
  #define __cond_export_sym_0(sym, sec) /* nothing */
  
  #else
  #define __EXPORT_SYMBOL ___EXPORT_SYMBOL
  #endif

  #define EXPORT_SYMBOL(sym)					\
  	__EXPORT_SYMBOL(sym, "")
  
  #define EXPORT_SYMBOL_GPL(sym)					\
  	__EXPORT_SYMBOL(sym, "_gpl")
  
  #define EXPORT_SYMBOL_GPL_FUTURE(sym)				\
  	__EXPORT_SYMBOL(sym, "_gpl_future")
  
  #ifdef CONFIG_UNUSED_SYMBOLS
  #define EXPORT_UNUSED_SYMBOL(sym) __EXPORT_SYMBOL(sym, "_unused")
  #define EXPORT_UNUSED_SYMBOL_GPL(sym) __EXPORT_SYMBOL(sym, "_unused_gpl")
  #else
  #define EXPORT_UNUSED_SYMBOL(sym)
  #define EXPORT_UNUSED_SYMBOL_GPL(sym)
  #endif
  
  #endif	/* __GENKSYMS__ */
  
  #else /* !CONFIG_MODULES... */
  
  #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 /* CONFIG_MODULES */

  #endif /* !__ASSEMBLY__ */

  
  #endif /* _LINUX_EXPORT_H */