linux-kernel - [PATCH] perf record: Change error message on failure

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Date:	Thu, 13 Sep 2012 12:20:54 +0200
From:	Robert Richter <robert.richter@....com>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
CC:	Ingo Molnar <mingo@...nel.org>, <linux-kernel@...r.kernel.org>,
	Robert Richter <robert.richter@....com>
Subject: [PATCH] perf record: Change error message on failure

Only report

 No CONFIG_PERF_EVENTS=y kernel support configured?

if the syscall fails with ENOSYS. In other cases CONFIG_PERF_EVENTS is
set and might confuse users. The default message is now:

 Not all events could be opened.

Signed-off-by: Robert Richter <robert.richter@....com>
---
 tools/perf/builtin-record.c |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index ae7c1c9..0290c91 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -305,19 +305,19 @@ try_again:
 			error("sys_perf_event_open() syscall returned with %d (%s).  /bin/dmesg may provide additional information.\n",
 			      err, strerror(err));
 
+			if (err == ENOSYS)
+				pr_err("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
 #if defined(__i386__) || defined(__x86_64__)
-			if (attr->type == PERF_TYPE_HARDWARE &&
-			    err == EOPNOTSUPP) {
+			else if (attr->type == PERF_TYPE_HARDWARE &&
+				 err == EOPNOTSUPP)
 				pr_err("No hardware sampling interrupt available."
 				       " No APIC? If so then you can boot the kernel"
 				       " with the \"lapic\" boot parameter to"
 				       " force-enable it.\n");
-				rc = -err;
-				goto out;
-			}
 #endif
+			else
+				pr_err("Not all events could be opened.\n");
 
-			pr_err("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
 			rc = -err;
 			goto out;
 		}
-- 
1.7.8.6


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