linux-kernel - [tip:perf/urgent] perf/x86: Fix PMU detection printout when no PMU is detected

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Message-ID: <tip-8a3da6c7d0031fcb6a0d17f9c7a68b0e01f52855@git.kernel.org>
Date:	Sat, 28 Sep 2013 10:57:48 -0700
From:	tip-bot for Ingo Molnar <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com, hpa@...or.com,
	mingo@...nel.org, a.p.zijlstra@...llo.nl, tglx@...utronix.de
Subject: [tip:perf/urgent] perf/x86:
  Fix PMU detection printout when no PMU is detected

Commit-ID:  8a3da6c7d0031fcb6a0d17f9c7a68b0e01f52855
Gitweb:     http://git.kernel.org/tip/8a3da6c7d0031fcb6a0d17f9c7a68b0e01f52855
Author:     Ingo Molnar <mingo@...nel.org>
AuthorDate: Sat, 28 Sep 2013 15:48:48 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sat, 28 Sep 2013 15:48:48 +0200

perf/x86: Fix PMU detection printout when no PMU is detected

Ran into this cryptic PMU bootup log recently:

[    0.124047] Performance Events:
[    0.125000] smpboot: ...

Turns out we print this if no PMU is detected. Fall back to
the right condition so that the following is printed:

[    0.122381] Performance Events: no PMU driver, software events only.

Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Link: http://lkml.kernel.org/n/tip-u2fwaUffakjp0qkpRfqljgsn@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/cpu/perf_event.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index a9c606b..897783b 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -1506,7 +1506,7 @@ static int __init init_hw_perf_events(void)
 		err = amd_pmu_init();
 		break;
 	default:
-		return 0;
+		err = -ENOTSUPP;
 	}
 	if (err != 0) {
 		pr_cont("no PMU driver, software events only.\n");
--
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