mirror of https://gitee.com/openkylin/linux.git
tracing: move utility functions from ftrace.h to kernel.h
Make common utility functions such as trace_printk() and tracing_start()/tracing_stop() generally available to kernel code. Cc: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Ingo Molnar
parent
5e1607a00b
commit
526211bc58
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@ -318,62 +318,6 @@ static inline void __ftrace_enabled_restore(int enabled)
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# define trace_preempt_off(a0, a1) do { } while (0)
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#endif
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#ifdef CONFIG_TRACING
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extern int ftrace_dump_on_oops;
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extern void tracing_start(void);
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extern void tracing_stop(void);
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extern void ftrace_off_permanent(void);
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extern void
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ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);
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/**
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* trace_printk - printf formatting in the ftrace buffer
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* @fmt: the printf format for printing
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*
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* Note: __trace_printk is an internal function for trace_printk and
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* the @ip is passed in via the trace_printk macro.
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*
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* This function allows a kernel developer to debug fast path sections
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* that printk is not appropriate for. By scattering in various
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* printk like tracing in the code, a developer can quickly see
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* where problems are occurring.
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*
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* This is intended as a debugging tool for the developer only.
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* Please refrain from leaving trace_printks scattered around in
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* your code.
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*/
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# define trace_printk(fmt...) __trace_printk(_THIS_IP_, fmt)
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extern int
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__trace_printk(unsigned long ip, const char *fmt, ...)
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__attribute__ ((format (printf, 2, 3)));
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# define ftrace_vprintk(fmt, ap) __trace_printk(_THIS_IP_, fmt, ap)
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extern int
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__ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);
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extern void ftrace_dump(void);
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#else
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static inline void
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ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { }
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static inline int
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trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
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static inline void tracing_start(void) { }
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static inline void tracing_stop(void) { }
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static inline void ftrace_off_permanent(void) { }
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static inline int
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trace_printk(const char *fmt, ...)
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{
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return 0;
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}
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static inline int
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ftrace_vprintk(const char *fmt, va_list ap)
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{
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return 0;
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}
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static inline void ftrace_dump(void) { }
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#endif
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#ifdef CONFIG_FTRACE_MCOUNT_RECORD
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extern void ftrace_init(void);
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extern void ftrace_init_module(struct module *mod,
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@ -542,6 +486,8 @@ static inline int test_tsk_trace_graph(struct task_struct *tsk)
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return tsk->trace & TSK_TRACE_FL_GRAPH;
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}
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extern int ftrace_dump_on_oops;
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#endif /* CONFIG_TRACING */
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@ -367,6 +367,64 @@ static inline char *pack_hex_byte(char *buf, u8 byte)
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({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
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#endif
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/*
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* General tracing related utility functions - trace_printk(),
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* tracing_start()/tracing_stop:
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*/
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#ifdef CONFIG_TRACING
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extern void tracing_start(void);
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extern void tracing_stop(void);
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extern void ftrace_off_permanent(void);
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extern void
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ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);
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/**
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* trace_printk - printf formatting in the ftrace buffer
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* @fmt: the printf format for printing
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*
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* Note: __trace_printk is an internal function for trace_printk and
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* the @ip is passed in via the trace_printk macro.
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*
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* This function allows a kernel developer to debug fast path sections
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* that printk is not appropriate for. By scattering in various
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* printk like tracing in the code, a developer can quickly see
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* where problems are occurring.
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*
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* This is intended as a debugging tool for the developer only.
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* Please refrain from leaving trace_printks scattered around in
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* your code.
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*/
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# define trace_printk(fmt...) __trace_printk(_THIS_IP_, fmt)
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extern int
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__trace_printk(unsigned long ip, const char *fmt, ...)
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__attribute__ ((format (printf, 2, 3)));
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# define ftrace_vprintk(fmt, ap) __trace_printk(_THIS_IP_, fmt, ap)
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extern int
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__ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);
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extern void ftrace_dump(void);
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#else
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static inline void
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ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { }
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static inline int
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trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
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static inline void tracing_start(void) { }
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static inline void tracing_stop(void) { }
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static inline void ftrace_off_permanent(void) { }
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static inline int
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trace_printk(const char *fmt, ...)
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{
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return 0;
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}
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static inline int
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ftrace_vprintk(const char *fmt, va_list ap)
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{
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return 0;
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}
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static inline void ftrace_dump(void) { }
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#endif
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/*
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* Display an IP address in readable format.
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*/
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