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authorTom Zanussi <tom.zanussi@linux.intel.com>2018-04-26 20:04:48 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2018-04-26 21:39:32 -0400
commit5ec432d7bf9dd3b4a2b84f8974e3adb71f45fb1d (patch)
tree14021d708618c4e2f35e070b774b536c9a3b8f07 /kernel
parent608940dabe1bd2ce4c97524004ec86637cf80f2c (diff)
downloadlinux-5ec432d7bf9dd3b4a2b84f8974e3adb71f45fb1d.tar.bz2
tracing: Add field parsing hist error for hist triggers
If the user specifies a nonexistent field for a hist trigger, the current code correctly flags that as an error, but doesn't tell the user what happened. Fix this by invoking hist_err() with an appropriate message when nonexistent fields are specified. Before: # echo 'hist:keys=pid:ts0=common_timestamp.usecs' >> /sys/kernel/debug/tracing/events/sched/sched_switch/trigger -su: echo: write error: Invalid argument # cat /sys/kernel/debug/tracing/events/sched/sched_switch/hist After: # echo 'hist:keys=pid:ts0=common_timestamp.usecs' >> /sys/kernel/debug/tracing/events/sched/sched_switch/trigger -su: echo: write error: Invalid argument # cat /sys/kernel/debug/tracing/events/sched/sched_switch/hist ERROR: Couldn't find field: pid Last command: keys=pid:ts0=common_timestamp.usecs Link: http://lkml.kernel.org/r/fdc8746969d16906120f162b99dd71c741e0b62c.1524790601.git.tom.zanussi@linux.intel.com Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com> Reported-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/trace_events_hist.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 66c87be4ebb2..f231fa2a3dcd 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -2481,6 +2481,7 @@ parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
else {
field = trace_find_event_field(file->event_call, field_name);
if (!field || !field->size) {
+ hist_err("Couldn't find field: ", field_name);
field = ERR_PTR(-EINVAL);
goto out;
}