linux-kernel - [tip:perf/urgent] perf record: Remove misleading error suggestion

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Date:   Sat, 21 Apr 2018 00:51:55 -0700
From:   tip-bot for Andi Kleen <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     acme@...hat.com, jolsa@...nel.org, hpa@...or.com,
        ak@...ux.intel.com, mingo@...nel.org, tglx@...utronix.de,
        linux-kernel@...r.kernel.org
Subject: [tip:perf/urgent] perf record: Remove misleading error suggestion

Commit-ID:  ec3948451e0ba317e66873b48d6cc51d701d4eb0
Gitweb:     https://git.kernel.org/tip/ec3948451e0ba317e66873b48d6cc51d701d4eb0
Author:     Andi Kleen <ak@...ux.intel.com>
AuthorDate: Fri, 6 Apr 2018 13:38:11 -0700
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 18 Apr 2018 15:35:49 -0300

perf record: Remove misleading error suggestion

When perf record encounters an error setting up an event it suggests
to enable CONFIG_PERF_EVENTS. This is misleading because:

- Usually it is enabled (it is really hard to disable on x86)

- The problem is usually somewhere else, e.g. the CPU is not supported
or an invalid configuration has been used.

Remove the misleading suggestion.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Acked-by: Jiri Olsa <jolsa@...nel.org>
Link: http://lkml.kernel.org/r/20180406203812.3087-4-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/evsel.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 1ac8d9236efd..66b62570c855 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2894,8 +2894,7 @@ int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
 
 	return scnprintf(msg, size,
 	"The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
-	"/bin/dmesg may provide additional information.\n"
-	"No CONFIG_PERF_EVENTS=y kernel support configured?",
+	"/bin/dmesg | grep -i perf may provide additional information.\n",
 			 err, str_error_r(err, sbuf, sizeof(sbuf)),
 			 perf_evsel__name(evsel));
 }