linux-kernel - [tip:perf/core] perf evsel: Enable type checking for perf_evsel_config

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Date:   Sat, 18 Nov 2017 00:25:33 -0800
From:   tip-bot for Andi Kleen <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, acme@...hat.com, mingo@...nel.org,
        tglx@...utronix.de, ak@...ux.intel.com,
        linux-kernel@...r.kernel.org, jolsa@...nel.org
Subject: [tip:perf/core] perf evsel: Enable type checking for
 perf_evsel_config_term types

Commit-ID:  d0565132605f454179699a1b8a3276fc0f8cc87b
Gitweb:     https://git.kernel.org/tip/d0565132605f454179699a1b8a3276fc0f8cc87b
Author:     Andi Kleen <ak@...ux.intel.com>
AuthorDate: Fri, 20 Oct 2017 13:27:54 -0700
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 16 Nov 2017 14:49:51 -0300

perf evsel: Enable type checking for perf_evsel_config_term types

Use a typed enum for the perf_evsel_config_term type enum.  This allows
gcc to do much stronger type checks, and also check for missing case
statements.

I removed the unused _MAX member from the number.

It found one missing case. I'm not sure it's a real problem, so I just
turned it into a BUG_ON for now.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Acked-by: Jiri Olsa <jolsa@...nel.org>
Link: http://lkml.kernel.org/r/20171020202755.21410-1-andi@firstfloor.org
[ Renamed the enum name to term_type as per jolsa's request ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/evsel.c | 2 ++
 tools/perf/util/evsel.h | 5 ++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index bfde6a7..4376cdf 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -779,6 +779,8 @@ static void apply_config_terms(struct perf_evsel *evsel,
 		case PERF_EVSEL__CONFIG_TERM_OVERWRITE:
 			attr->write_backward = term->val.overwrite ? 1 : 0;
 			break;
+		case PERF_EVSEL__CONFIG_TERM_DRV_CFG:
+			BUG_ON(1);
 		default:
 			break;
 		}
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 157f49e..0688880 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -38,7 +38,7 @@ struct cgroup_sel;
  * It is allocated within event parsing and attached to
  * perf_evsel::config_terms list head.
 */
-enum {
+enum term_type {
 	PERF_EVSEL__CONFIG_TERM_PERIOD,
 	PERF_EVSEL__CONFIG_TERM_FREQ,
 	PERF_EVSEL__CONFIG_TERM_TIME,
@@ -49,12 +49,11 @@ enum {
 	PERF_EVSEL__CONFIG_TERM_OVERWRITE,
 	PERF_EVSEL__CONFIG_TERM_DRV_CFG,
 	PERF_EVSEL__CONFIG_TERM_BRANCH,
-	PERF_EVSEL__CONFIG_TERM_MAX,
 };
 
 struct perf_evsel_config_term {
 	struct list_head	list;
-	int	type;
+	enum term_type	type;
 	union {
 		u64	period;
 		u64	freq;