linux-kernel - [PATCH] perf: add const qualifier to perf_pmu

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Message-Id: <1370339148-5566-1-git-send-email-mjonker@synopsys.com>
Date:	Tue,  4 Jun 2013 11:45:48 +0200
From:	Mischa Jonker <Mischa.Jonker@...opsys.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	James Hogan <james.hogan@...tec.com>,
	linux-kernel@...r.kernel.org, Vineet.Gupta1@...opsys.com
Cc:	Mischa Jonker <Mischa.Jonker@...opsys.com>
Subject: [PATCH] perf: add const qualifier to perf_pmu_register's 'name' arg

This allows us to use pdev->name for registering a PMU device.
IMO the name is not supposed to be changed anyway.

Signed-off-by: Mischa Jonker <mjonker@...opsys.com>
---
 arch/metag/kernel/perf/perf_event.c |    2 +-
 include/linux/perf_event.h          |    4 ++--
 kernel/events/core.c                |    2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/metag/kernel/perf/perf_event.c b/arch/metag/kernel/perf/perf_event.c
index 3665694..5b18888 100644
--- a/arch/metag/kernel/perf/perf_event.c
+++ b/arch/metag/kernel/perf/perf_event.c
@@ -882,7 +882,7 @@ static int __init init_hw_perf_events(void)
 	}
 
 	register_cpu_notifier(&metag_pmu_notifier);
-	ret = perf_pmu_register(&pmu, (char *)metag_pmu->name, PERF_TYPE_RAW);
+	ret = perf_pmu_register(&pmu, metag_pmu->name, PERF_TYPE_RAW);
 out:
 	return ret;
 }
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index f463a46..65a462c 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -188,7 +188,7 @@ struct pmu {
 
 	struct device			*dev;
 	const struct attribute_group	**attr_groups;
-	char				*name;
+	const char			*name;
 	int				type;
 
 	int * __percpu			pmu_disable_count;
@@ -518,7 +518,7 @@ struct perf_output_handle {
 
 #ifdef CONFIG_PERF_EVENTS
 
-extern int perf_pmu_register(struct pmu *pmu, char *name, int type);
+extern int perf_pmu_register(struct pmu *pmu, const char *name, int type);
 extern void perf_pmu_unregister(struct pmu *pmu);
 
 extern int perf_num_counters(void);
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 9dc297f..7003d6f 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5952,7 +5952,7 @@ free_dev:
 static struct lock_class_key cpuctx_mutex;
 static struct lock_class_key cpuctx_lock;
 
-int perf_pmu_register(struct pmu *pmu, char *name, int type)
+int perf_pmu_register(struct pmu *pmu, const char *name, int type)
 {
 	int cpu, ret;
 
-- 
1.7.0.4

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