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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2021-02-05 15:40:04 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2021-02-05 15:40:04 -0500
commit256cfdd6fdf70c6fcf0f7c8ddb0ebd73ce8f3bc9 (patch)
tree3ebb0f7332824117df8560ea5d8ab5fa0267f44f /kernel
parentc8b186a8d54d7e12d28e9f9686cb00ff18fc2ab2 (diff)
downloadlinux-256cfdd6fdf70c6fcf0f7c8ddb0ebd73ce8f3bc9.tar.bz2
tracing: Do not count ftrace events in top level enable output
The file /sys/kernel/tracing/events/enable is used to enable all events by echoing in "1", or disabling all events when echoing in "0". To know if all events are enabled, disabled, or some are enabled but not all of them, cating the file should show either "1" (all enabled), "0" (all disabled), or "X" (some enabled but not all of them). This works the same as the "enable" files in the individule system directories (like tracing/events/sched/enable). But when all events are enabled, the top level "enable" file shows "X". The reason is that its checking the "ftrace" events, which are special events that only exist for their format files. These include the format for the function tracer events, that are enabled when the function tracer is enabled, but not by the "enable" file. The check includes these events, which will always be disabled, and even though all true events are enabled, the top level "enable" file will show "X" instead of "1". To fix this, have the check test the event's flags to see if it has the "IGNORE_ENABLE" flag set, and if so, not test it. Cc: stable@vger.kernel.org Fixes: 553552ce1796c ("tracing: Combine event filter_active and enable into single flags field") Reported-by: "Yordan Karadzhov (VMware)" <y.karadz@gmail.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/trace_events.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index e9d28eeccb7e..d387b774ceeb 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -1212,7 +1212,8 @@ system_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
mutex_lock(&event_mutex);
list_for_each_entry(file, &tr->events, list) {
call = file->event_call;
- if (!trace_event_name(call) || !call->class || !call->class->reg)
+ if ((call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) ||
+ !trace_event_name(call) || !call->class || !call->class->reg)
continue;
if (system && strcmp(call->class->system, system->name) != 0)