perf diff: Don't use hack to skip column length calculation

Previously we use a nasty hack to skip the hists__calc_col_len for block
since this function is not very suitable for block column length
calculation.

This patch removes the hack code and add a check at the entry of
hists__calc_col_len to skip for block case.
Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@intel.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20191107074719.26139-2-yao.jin@linux.intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-diff.c

@@ -765,13 +765,6 @@ static void block_hists_match(struct hists *hists_base,
 	}
 }
 
-static int filter_cb(struct hist_entry *he, void *arg __maybe_unused)
-{
-	/* Skip the calculation of column length in output_resort */
-	he->filtered = true;
-	return 0;
-}
-
 static void hists__precompute(struct hists *hists)
 {
 	struct rb_root_cached *root;
@@ -820,8 +813,8 @@ static void hists__precompute(struct hists *hists)
 				if (bh->valid && pair_bh->valid) {
 					block_hists_match(&bh->block_hists,
 							  &pair_bh->block_hists);
-					hists__output_resort_cb(&pair_bh->block_hists,
-								NULL, filter_cb);
+					hists__output_resort(&pair_bh->block_hists,
+							     NULL);
 				}
 				break;
 			default:

tools/perf/util/hist.c

@@ -80,6 +80,8 @@ void hists__calc_col_len(struct hists *hists, struct hist_entry *h)
 	int symlen;
 	u16 len;
 
+	if (h->block_info)
+		return;
 	/*
 	 * +4 accounts for '[x] ' priv level info
 	 * +2 accounts for 0x prefix on raw addresses