diff options
| -rw-r--r-- | kernel/trace/trace.c | 33 | ||||
| -rw-r--r-- | kernel/trace/trace.h | 2 |
2 files changed, 35 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 01572ef79802..b691af1c1b5a 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -1583,6 +1583,39 @@ void tracer_tracing_off(struct trace_array *tr) } /** + * tracer_tracing_disable() - temporary disable the buffer from write + * @tr: The trace array to disable its buffer for + * + * Expects trace_tracing_enable() to re-enable tracing. + * The difference between this and tracer_tracing_off() is that this + * is a counter and can nest, whereas, tracer_tracing_off() can + * be called multiple times and a single trace_tracing_on() will + * enable it. + */ +void tracer_tracing_disable(struct trace_array *tr) +{ + if (WARN_ON_ONCE(!tr->array_buffer.buffer)) + return; + + ring_buffer_record_disable(tr->array_buffer.buffer); +} + +/** + * tracer_tracing_enable() - counter part of tracer_tracing_disable() + * @tr: The trace array that had tracer_tracincg_disable() called on it + * + * This is called after tracer_tracing_disable() has been called on @tr, + * when it's safe to re-enable tracing. + */ +void tracer_tracing_enable(struct trace_array *tr) +{ + if (WARN_ON_ONCE(!tr->array_buffer.buffer)) + return; + + ring_buffer_record_enable(tr->array_buffer.buffer); +} + +/** * tracing_off - turn off tracing buffers * * This function stops the tracing buffers from recording data. diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 79be1995db44..74f1fe5788d4 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -665,6 +665,8 @@ bool tracing_is_disabled(void); bool tracer_tracing_is_on(struct trace_array *tr); void tracer_tracing_on(struct trace_array *tr); void tracer_tracing_off(struct trace_array *tr); +void tracer_tracing_disable(struct trace_array *tr); +void tracer_tracing_enable(struct trace_array *tr); struct dentry *trace_create_file(const char *name, umode_t mode, struct dentry *parent, |