linux/arch/powerpc/include/asm/ftrace.h

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#ifndef _ASM_POWERPC_FTRACE
#define _ASM_POWERPC_FTRACE
#ifdef CONFIG_FTRACE
#define MCOUNT_ADDR ((long)(_mcount))
#define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */
#ifndef __ASSEMBLY__
extern void _mcount(void);
#endif
#endif
#endif /* _ASM_POWERPC_FTRACE */