linux-kernel - [PATCH 01/11] perf, tools: Dont stop PMU parsing on alias parse error

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Message-Id: <1452906773-7581-2-git-send-email-andi@firstfloor.org>
Date:	Fri, 15 Jan 2016 17:12:43 -0800
From:	Andi Kleen <andi@...stfloor.org>
To:	acme@...nel.org
Cc:	peterz@...radead.org, jolsa@...nel.org, eranian@...gle.com,
	linux-kernel@...r.kernel.org, mingo@...nel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 01/11] perf, tools: Dont stop PMU parsing on alias parse error

From: Andi Kleen <ak@...ux.intel.com>

When an error happens during alias parsing currently the complete
parsing of all attributes of the PMU is stopped. This is breaks
old perf on a newer kernel that may have not-yet-know
alias attributes (such as .scale or .per-pkg).

Continue when some attribute is unparseable.

This is IMHO a stable candidate and should be backported
to older versions to avoid problems with newer kernels.

v2: Print warnings when something goes wrong.
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 tools/perf/util/pmu.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index b597bcc..0d228d1 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -284,13 +284,12 @@ static int pmu_aliases_parse(char *dir, struct list_head *head)
 {
 	struct dirent *evt_ent;
 	DIR *event_dir;
-	int ret = 0;
 
 	event_dir = opendir(dir);
 	if (!event_dir)
 		return -EINVAL;
 
-	while (!ret && (evt_ent = readdir(event_dir))) {
+	while ((evt_ent = readdir(event_dir))) {
 		char path[PATH_MAX];
 		char *name = evt_ent->d_name;
 		FILE *file;
@@ -306,17 +305,19 @@ static int pmu_aliases_parse(char *dir, struct list_head *head)
 
 		snprintf(path, PATH_MAX, "%s/%s", dir, name);
 
-		ret = -EINVAL;
 		file = fopen(path, "r");
-		if (!file)
-			break;
+		if (!file) {
+			pr_warning("Cannot open %s\n", path);
+			continue;
+		}
 
-		ret = perf_pmu__new_alias(head, dir, name, file);
+		if (perf_pmu__new_alias(head, dir, name, file) < 0)
+			pr_warning("Cannot set up %s\n", name);
 		fclose(file);
 	}
 
 	closedir(event_dir);
-	return ret;
+	return 0;
 }
 
 /*
-- 
2.4.3