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tracing: Dump stacktrace trigger to the corresponding instance 

commit ce33c845b030c9cf768370c951bc699470b09fa7 upstream.

The stacktrace event trigger is not dumping the stacktrace to the instance
where it was enabled, but to the global "instance."

Use the private_data, pointing to the trigger file, to figure out the
corresponding trace instance, and use it in the trigger action, like
snapshot_trigger does.

Link: https://lkml.kernel.org/r/afbb0b4f18ba92c276865bc97204d438473f4ebc.1645396236.git.bristot@kernel.org

Cc: stable@vger.kernel.org
Fixes: ae63b31e4d ("tracing: Separate out trace events from global variables")
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Tested-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Daniel Bristot de Oliveira 2022-02-20 23:49:57 +01:00 committed by Greg Kroah-Hartman
parent bad7ed5575
commit 2da11442a1
1 changed files with 8 additions and 1 deletions
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9
kernel/trace/trace_events_trigger.c
View File

@ -1219,7 +1219,14 @@ static void
stacktrace_trigger(struct event_trigger_data *data, void *rec,
struct ring_buffer_event *event)
{
trace_dump_stack(STACK_SKIP);
struct trace_event_file *file = data->private_data;
unsigned long flags;
if (file) {
local_save_flags(flags);
__trace_stack(file->tr, flags, STACK_SKIP, preempt_count());
} else
trace_dump_stack(STACK_SKIP);
}
static void