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tracing: Dump stacktrace trigger to the corresponding instance

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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: ae63b31e4d0e2 ("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 69848f9488
commit 5e8446e382
1 changed files with 8 additions and 1 deletions
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9
kernel/trace/trace_events_trigger.c
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@ -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