diff options
| -rw-r--r-- | kernel/trace/trace.c | 4 | ||||
| -rw-r--r-- | kernel/trace/trace.h | 1 | ||||
| -rw-r--r-- | kernel/trace/trace_printk.c | 14 |
3 files changed, 14 insertions, 5 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 991bab9..d98789b 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -3555,8 +3555,10 @@ int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled) #endif } - if (mask == TRACE_ITER_PRINTK) + if (mask == TRACE_ITER_PRINTK) { trace_printk_start_stop_comm(enabled); + trace_printk_control(enabled); + } return 0; } diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 0715565..33d1e53 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -1318,6 +1318,7 @@ extern const char *__stop___trace_bprintk_fmt[]; extern const char *__start___tracepoint_str[]; extern const char *__stop___tracepoint_str[]; +void trace_printk_control(bool enabled); void trace_printk_init_buffers(void); void trace_printk_start_comm(void); int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); diff --git a/kernel/trace/trace_printk.c b/kernel/trace/trace_printk.c index 36c1455..1c2b285 100644 --- a/kernel/trace/trace_printk.c +++ b/kernel/trace/trace_printk.c @@ -178,6 +178,12 @@ static inline void format_mod_start(void) { } static inline void format_mod_stop(void) { } #endif /* CONFIG_MODULES */ +static bool __read_mostly trace_printk_enabled = true; + +void trace_printk_control(bool enabled) +{ + trace_printk_enabled = enabled; +} __initdata_or_module static struct notifier_block module_trace_bprintk_format_nb = { @@ -192,7 +198,7 @@ int __trace_bprintk(unsigned long ip, const char *fmt, ...) if (unlikely(!fmt)) return 0; - if (!(trace_flags & TRACE_ITER_PRINTK)) + if (!trace_printk_enabled) return 0; va_start(ap, fmt); @@ -207,7 +213,7 @@ int __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap) if (unlikely(!fmt)) return 0; - if (!(trace_flags & TRACE_ITER_PRINTK)) + if (!trace_printk_enabled) return 0; return trace_vbprintk(ip, fmt, ap); @@ -219,7 +225,7 @@ int __trace_printk(unsigned long ip, const char *fmt, ...) int ret; va_list ap; - if (!(trace_flags & TRACE_ITER_PRINTK)) + if (!trace_printk_enabled) return 0; va_start(ap, fmt); @@ -231,7 +237,7 @@ EXPORT_SYMBOL_GPL(__trace_printk); int __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap) { - if (!(trace_flags & TRACE_ITER_PRINTK)) + if (!trace_printk_enabled) return 0; return trace_vprintk(ip, fmt, ap); |