linux-kernel - [tip:perf/urgent] perf/x86/amd: Do not print an error when the device is not present

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Message-ID: <tip-100ac5331519866afa9b000b10642b00cb6d03dd@git.kernel.org>
Date:	Thu, 4 Jul 2013 23:51:31 -0700
From:	tip-bot for Peter Zijlstra <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	torvalds@...ux-foundation.org, peterz@...radead.org,
	suravee.suthikulpanit@....com, acme@...radead.org,
	tglx@...utronix.de
Subject: [tip:perf/urgent] perf/x86/amd:
  Do not print an error when the device is not present

Commit-ID:  100ac5331519866afa9b000b10642b00cb6d03dd
Gitweb:     http://git.kernel.org/tip/100ac5331519866afa9b000b10642b00cb6d03dd
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Wed, 3 Jul 2013 09:55:42 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 5 Jul 2013 08:27:15 +0200

perf/x86/amd: Do not print an error when the device is not present

As Linus said its not an error to not have an AMD IOMMU; esp.
when you're not even running on an AMD platform.

Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Acked-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Cc: Arnaldo Carvalho de Melo <acme@...radead.org>
Link: http://lkml.kernel.org/r/20130703075542.GF23916@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/cpu/perf_event_amd_iommu.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event_amd_iommu.c b/arch/x86/kernel/cpu/perf_event_amd_iommu.c
index 0db655e..639d128 100644
--- a/arch/x86/kernel/cpu/perf_event_amd_iommu.c
+++ b/arch/x86/kernel/cpu/perf_event_amd_iommu.c
@@ -491,10 +491,8 @@ static struct perf_amd_iommu __perf_iommu = {
 static __init int amd_iommu_pc_init(void)
 {
 	/* Make sure the IOMMU PC resource is available */
-	if (!amd_iommu_pc_supported()) {
-		pr_err("perf: amd_iommu PMU not installed. No support!\n");
+	if (!amd_iommu_pc_supported())
 		return -ENODEV;
-	}
 
 	_init_perf_amd_iommu(&__perf_iommu, "amd_iommu");
 
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