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tracing: Exclude 'generic fields' from histograms

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There are a small number of 'generic fields' (comm/COMM/cpu/CPU) that
are found by trace_find_event_field() but are only meant for
filtering.  Specifically, they unlike normal fields, they have a size
of 0 and thus wreak havoc when used as a histogram key.

Exclude these (return -EINVAL) when used as histogram keys.

Link: http://lkml.kernel.org/r/956154cbc3e8a4f0633d619b886c97f0f0edf7b4.1506105045.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>
This commit is contained in:
Tom Zanussi 2017-09-22 14:58:17 -05:00 committed by Steven Rostedt (VMware)
parent 1a149d7d3f
commit a15f7fc203
1 changed files with 2 additions and 2 deletions
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4
kernel/trace/trace_events_hist.c
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@ -450,7 +450,7 @@ static int create_val_field(struct hist_trigger_data *hist_data,
}
field = trace_find_event_field(file->event_call, field_name);
if (!field) {
if (!field || !field->size) {
ret = -EINVAL;
goto out;
}
@ -548,7 +548,7 @@ static int create_key_field(struct hist_trigger_data *hist_data,
}
field = trace_find_event_field(file->event_call, field_name);
if (!field) {
if (!field || !field->size) {
ret = -EINVAL;
goto out;
}