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authorTom Zanussi <tom.zanussi@linux.intel.com>2018-04-26 20:04:49 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2018-04-26 21:39:58 -0400
commitdcf234577cd31fa16874e828b90659166ad6b80d (patch)
tree34dc3ae4434369feb26c4572eca34c64cd71575e /kernel
parent5ec432d7bf9dd3b4a2b84f8974e3adb71f45fb1d (diff)
downloadlinux-dcf234577cd31fa16874e828b90659166ad6b80d.tar.bz2
tracing: Add field modifier parsing hist error for hist triggers
If the user specifies an invalid field modifier 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 invalid modifiers are specified. Before: # echo 'hist:keys=pid:ts0=common_timestamp.junkusecs' >> /sys/kernel/debug/tracing/events/sched/sched_wakeup/trigger -su: echo: write error: Invalid argument # cat /sys/kernel/debug/tracing/events/sched/sched_wakeup/hist After: # echo 'hist:keys=pid:ts0=common_timestamp.junkusecs' >> /sys/kernel/debug/tracing/events/sched/sched_wakeup/trigger -su: echo: write error: Invalid argument # cat /sys/kernel/debug/tracing/events/sched/sched_wakeup/hist ERROR: Invalid field modifier: junkusecs Last command: keys=pid:ts0=common_timestamp.junkusecs Link: http://lkml.kernel.org/r/b043c59fa79acd06a5f14a1d44dee9e5a3cd1248.1524790601.git.tom.zanussi@linux.intel.com Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com> 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 f231fa2a3dcd..b9061ed59bbd 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -2466,6 +2466,7 @@ parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
else if (strcmp(modifier, "usecs") == 0)
*flags |= HIST_FIELD_FL_TIMESTAMP_USECS;
else {
+ hist_err("Invalid field modifier: ", modifier);
field = ERR_PTR(-EINVAL);
goto out;
}