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7d241ff056
With dynamic function tracer, by default, _mcount is defined as an "empty" function, it returns directly without any more action. When enabling it in user-space, it will jump to a real tracing function(ftrace_caller), and do the real job for us. Differ from the static function tracer, dynamic function tracer provides two functions ftrace_make_call()/ftrace_make_nop() to enable/disable the tracing of some indicated kernel functions(set_ftrace_filter). In the kernel version, there is only one "_mcount" string for every kernel function, so, we just need to match this one in mcount_regex of scripts/recordmcount.pl. For more information please look at code and Documentation/trace folder. Steven ACK that scripts/recordmcount.pl part. Acked-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Michal Simek <monstr@monstr.eu>
27 lines
593 B
C
27 lines
593 B
C
#ifndef _ASM_MICROBLAZE_FTRACE
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#define _ASM_MICROBLAZE_FTRACE
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#ifdef CONFIG_FUNCTION_TRACER
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#define MCOUNT_ADDR ((long)(_mcount))
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#define MCOUNT_INSN_SIZE 8 /* sizeof mcount call */
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#ifndef __ASSEMBLY__
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extern void _mcount(void);
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extern void ftrace_call_graph(void);
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#endif
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#ifdef CONFIG_DYNAMIC_FTRACE
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/* reloction of mcount call site is the same as the address */
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static inline unsigned long ftrace_call_adjust(unsigned long addr)
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{
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return addr;
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}
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struct dyn_arch_ftrace {
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};
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#endif /* CONFIG_DYNAMIC_FTRACE */
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#endif /* CONFIG_FUNCTION_TRACER */
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#endif /* _ASM_MICROBLAZE_FTRACE */
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