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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2021-08-16 23:42:56 -0400
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2021-08-18 18:10:32 -0400
commit8b0e6c744fef6462382041b30878c91f15069fc6 (patch)
tree07610239769d36c97100ca29c501ba35114f0c6a /include/linux/trace_events.h
parent99c37d1a63eafcd3673302a7953df760b46d0f6f (diff)
tracing: Add DYNAMIC flag for dynamic events
To differentiate between static and dynamic events, add a new flag DYNAMIC to the event flags that all dynamic events have set. This will allow to differentiate when attaching to a dynamic event from a static event. Static events have a mod pointer that references the module they were created in (or NULL for core kernel). This can be incremented when the event has something attached to it. But there exists no such mechanism for dynamic events. This is dangerous as the dynamic events may now disappear without the "attachment" knowing that it no longer exists. To enforce the dynamic flag, change dyn_event_add() to pass the event that is being created such that it can set the DYNAMIC flag of the event. This helps make sure that no location that creates a dynamic event misses setting this flag. Link: https://lore.kernel.org/linux-trace-devel/20210813004448.51c7de69ce432d338f4d226b@kernel.org/ Link: https://lkml.kernel.org/r/20210817035026.936958254@goodmis.org Suggested-by: Masami Hiramatsu <mhiramat@kernel.org> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/trace_events.h')
-rw-r--r--include/linux/trace_events.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index ad413b382a3c..53c9dffd87fd 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -310,6 +310,7 @@ enum {
TRACE_EVENT_FL_NO_SET_FILTER_BIT,
TRACE_EVENT_FL_IGNORE_ENABLE_BIT,
TRACE_EVENT_FL_TRACEPOINT_BIT,
+ TRACE_EVENT_FL_DYNAMIC_BIT,
TRACE_EVENT_FL_KPROBE_BIT,
TRACE_EVENT_FL_UPROBE_BIT,
};
@@ -321,6 +322,7 @@ enum {
* NO_SET_FILTER - Set when filter has error and is to be ignored
* IGNORE_ENABLE - For trace internal events, do not enable with debugfs file
* TRACEPOINT - Event is a tracepoint
+ * DYNAMIC - Event is a dynamic event (created at run time)
* KPROBE - Event is a kprobe
* UPROBE - Event is a uprobe
*/
@@ -330,6 +332,7 @@ enum {
TRACE_EVENT_FL_NO_SET_FILTER = (1 << TRACE_EVENT_FL_NO_SET_FILTER_BIT),
TRACE_EVENT_FL_IGNORE_ENABLE = (1 << TRACE_EVENT_FL_IGNORE_ENABLE_BIT),
TRACE_EVENT_FL_TRACEPOINT = (1 << TRACE_EVENT_FL_TRACEPOINT_BIT),
+ TRACE_EVENT_FL_DYNAMIC = (1 << TRACE_EVENT_FL_DYNAMIC_BIT),
TRACE_EVENT_FL_KPROBE = (1 << TRACE_EVENT_FL_KPROBE_BIT),
TRACE_EVENT_FL_UPROBE = (1 << TRACE_EVENT_FL_UPROBE_BIT),
};