linkage.h

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#ifndef _LINUX_LINKAGE_H
#define _LINUX_LINKAGE_H

#ifdef __cplusplus
#define CPP_ASMLINKAGE extern "C"
#else
#define CPP_ASMLINKAGE
#endif

#if defined __i386__ && (__GNUC__ > 2 || __GNUC_MINOR__ > 7)
#define asmlinkage CPP_ASMLINKAGE GCC_ATTRIBUTE((regparm(0)))
#else
#define asmlinkage CPP_ASMLINKAGE
#endif

#endif