linux-kernel - [PATCH 04/16] perf, persistent: Print error code on failure when adding events

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Date:	Fri, 31 May 2013 10:47:24 +0200
From:	Robert Richter <rric@...nel.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org,
	Robert Richter <robert.richter@...xeda.com>
Subject: [PATCH 04/16] perf, persistent: Print error code on failure when adding events

From: Robert Richter <robert.richter@...xeda.com>

Improve error reporting.

Signed-off-by: Robert Richter <robert.richter@...xeda.com>
---
 kernel/events/persistent.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/events/persistent.c b/kernel/events/persistent.c
index 1e6c03a..6612eb77 100644
--- a/kernel/events/persistent.c
+++ b/kernel/events/persistent.c
@@ -123,15 +123,15 @@ int perf_add_persistent_event(struct perf_event_attr *attr, unsigned nr_pages)
 
 	for_each_possible_cpu(i) {
 		event = add_persistent_event_on_cpu(i, attr, nr_pages);
-		if (IS_ERR(event)) {
-			pr_err("%s: Error adding persistent event on cpu %d\n",
-				__func__, i);
+		if (IS_ERR(event))
 			goto unwind;
-		}
 	}
 	return 0;
 
 unwind:
+	pr_err("%s: Error adding persistent event on cpu %d: %ld\n",
+		__func__, i, PTR_ERR(event));
+
 	while (--i >= 0)
 		del_persistent_event(i, attr);
 
-- 
1.8.1.1

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