diff options
| author | Tom Zanussi <tom.zanussi@linux.intel.com> | 2017-09-22 21:58:17 +0200 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2017-10-04 19:05:08 +0200 |
| commit | a15f7fc20389a8827d5859907568b201234d4b79 (patch) | |
| tree | 18e55b957c6eaf554397b8a8d4033bdfd0c87c20 /kernel/trace/trace_events_hist.c | |
| parent | ring-buffer: Rewrite trace_recursive_(un)lock() to be simpler (diff) | |
| download | linux-a15f7fc20389a8827d5859907568b201234d4b79.tar.xz linux-a15f7fc20389a8827d5859907568b201234d4b79.zip | |
tracing: Exclude 'generic fields' from histograms
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>
Diffstat (limited to 'kernel/trace/trace_events_hist.c')
| -rw-r--r-- | kernel/trace/trace_events_hist.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index f123b5d0c226..121d56850f24 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -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; } |