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tracing: Add trace_get/put_event_file()

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Add a function to get an event file and prevent it from going away on
module or instance removal.

trace_get_event_file() will find an event file in a given instance (if
instance is NULL, it assumes the top trace array) and return it,
pinning the instance's trace array as well as the event's module, if
applicable, so they won't go away while in use.

trace_put_event_file() does the matching release.

Link: http://lkml.kernel.org/r/bb31ac4bdda168d5ed3c4b5f5a4c8f633e8d9118.1580323897.git.zanussi@kernel.org

Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
[ Moved trace_array_put() to end of trace_put_event_file() ]
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Tom Zanussi
2020-01-29 12:59:22 -06:00
committed by Steven Rostedt (VMware)
parent 89c95fcef1
commit e3e2a2cc9c
2 changed files with 90 additions and 0 deletions
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5
include/linux/trace_events.h
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@@ -349,6 +349,11 @@ enum {
EVENT_FILE_FL_WAS_ENABLED_BIT,
};
extern struct trace_event_file *trace_get_event_file(const char *instance,
const char *system,
const char *event);
extern void trace_put_event_file(struct trace_event_file *file);
/*
* Event file flags:
* ENABLED - The event is enabled