linux-kernel - [PATCH 1/9] perf, tools: Dont stop PMU parsing on alias parse error

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Date:	Fri,  7 Aug 2015 18:06:17 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	acme@...nel.org
Cc:	jolsa@...nel.org, linux-kernel@...r.kernel.org, eranian@...gle.com,
	namhyung@...nel.org, peterz@...radead.org, mingo@...nel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 1/9] 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.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 tools/perf/util/pmu.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index d4b0e64..ce56354 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -283,13 +283,12 @@ 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;
@@ -305,17 +304,16 @@ 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;
+			continue;
 
-		ret = perf_pmu__new_alias(head, dir, name, file);
+		perf_pmu__new_alias(head, dir, name, file);
 		fclose(file);
 	}
 
 	closedir(event_dir);
-	return ret;
+	return 0;
 }
 
 /*
-- 
2.4.3

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