linux-kernel - [PATCH RFC v1 4/4] perf/x86: Annotate some of the error codes with perf

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Message-Id: <1437738359-23920-5-git-send-email-alexander.shishkin@linux.intel.com>
Date:	Fri, 24 Jul 2015 14:45:59 +0300
From:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>
Cc:	linux-kernel@...r.kernel.org, adrian.hunter@...el.com,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Vince Weaver <vince@...ter.net>,
	Stephane Eranian <eranian@...gle.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [PATCH RFC v1 4/4] perf/x86: Annotate some of the error codes with perf_err()

This patch annotates a few x86-specific error paths with perf's extended
error reporting facility.

NYet-Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
---
 arch/x86/kernel/cpu/perf_event.c           | 8 ++++++--
 arch/x86/kernel/cpu/perf_event_intel_lbr.c | 2 +-
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 3658de4790..2b22e57100 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -12,6 +12,8 @@
  *  For licencing details see kernel-base/COPYING
  */
 
+#define PERF_MODNAME	"perf/x86"
+
 #include <linux/perf_event.h>
 #include <linux/capability.h>
 #include <linux/notifier.h>
@@ -426,11 +428,13 @@ int x86_setup_perfctr(struct perf_event *event)
 
 		/* BTS is currently only allowed for user-mode. */
 		if (!attr->exclude_kernel)
-			return -EOPNOTSUPP;
+			return perf_err(-EOPNOTSUPP,
+					"BTS sampling not allowed for kernel space");
 
 		/* disallow bts if conflicting events are present */
 		if (x86_add_exclusive(x86_lbr_exclusive_lbr))
-			return -EBUSY;
+			return perf_err(-EBUSY,
+					"LBR conflicts with active events");
 
 		event->destroy = hw_perf_lbr_event_destroy;
 	}
diff --git a/arch/x86/kernel/cpu/perf_event_intel_lbr.c b/arch/x86/kernel/cpu/perf_event_intel_lbr.c
index 452a7bd2de..b004fb310f 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_lbr.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_lbr.c
@@ -577,7 +577,7 @@ int intel_pmu_setup_lbr_filter(struct perf_event *event)
 	 * no LBR on this PMU
 	 */
 	if (!x86_pmu.lbr_nr)
-		return -EOPNOTSUPP;
+		return perf_err(-EOPNOTSUPP, "LBR is not supported by this cpu");
 
 	/*
 	 * setup SW LBR filter
-- 
2.1.4

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