perf diff: Fix segfault on 'perf diff -o N' option

The -o/--order option is to select column number to sort a diff result.

It does the job by adding a hpp field at the beginning of the sort list.
But it should not be added to the output field list as it has no
callbacks required by a output field.

During the setup_sorting(), the perf_hpp__setup_output_field() appends
the given sort keys to the output field if it's not there already.

Originally it was checked by fmt->list being non-empty.  But commit
3f931f2c4274 ("perf hists: Make hpp setup function generic") changed it
to check the ->equal callback.

Anyways, we don't need to add the pseudo hpp field to the output field
list since it won't be used for output.  So just skip fields if they
have no ->color or ->entry callbacks.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Fixes: 3f931f2c4274 ("perf hists: Make hpp setup function generic")
Link: http://lkml.kernel.org/r/20170118051457.30946-1-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/ui/hist.c b/tools/perf/ui/hist.c
index 37388397b5bc051b66dca810c65a4434eea07bb6..4ec79b2f9416aa220d0a016c53c8caad49fdeaa1 100644 (file)
--- a/tools/perf/ui/hist.c
+++ b/tools/perf/ui/hist.c
@@ -560,6 +560,10 @@ void perf_hpp__setup_output_field(struct perf_hpp_list *list)
        perf_hpp_list__for_each_sort_list(list, fmt) {
                struct perf_hpp_fmt *pos;
 
+               /* skip sort-only fields ("sort_compute" in perf diff) */
+               if (!fmt->entry && !fmt->color)
+                       continue;
+
                perf_hpp_list__for_each_format(list, pos) {
                        if (fmt_equal(fmt, pos))
                                goto next;