perf/x86/rapl: Use unified perf_event_sysfs_show instead of special interface

Actually, rapl_sysfs_show is a duplicate of perf_event_sysfs_show. We
prefer to use the unified interface.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Dasaratharaman Chandramouli<dasaratharaman.chandramouli@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Robert Richter <rric@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: http://lkml.kernel.org/r/1449223661-2437-1-git-send-email-ray.huang@amd.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/kernel/cpu/perf_event_intel_rapl.c

@@ -109,11 +109,11 @@ static struct kobj_attribute format_attr_##_var =		\
 
 #define RAPL_CNTR_WIDTH 32 /* 32-bit rapl counters */
 
-#define RAPL_EVENT_ATTR_STR(_name, v, str)				\
-static struct perf_pmu_events_attr event_attr_##v = {			\
-	.attr		= __ATTR(_name, 0444, rapl_sysfs_show, NULL),	\
-	.id		= 0,						\
-	.event_str	= str,						\
+#define RAPL_EVENT_ATTR_STR(_name, v, str)					\
+static struct perf_pmu_events_attr event_attr_##v = {				\
+	.attr		= __ATTR(_name, 0444, perf_event_sysfs_show, NULL),	\
+	.id		= 0,							\
+	.event_str	= str,							\
 };
 
 struct rapl_pmu {
@@ -405,19 +405,6 @@ static struct attribute_group rapl_pmu_attr_group = {
 	.attrs = rapl_pmu_attrs,
 };
 
-static ssize_t rapl_sysfs_show(struct device *dev,
-			       struct device_attribute *attr,
-			       char *page)
-{
-	struct perf_pmu_events_attr *pmu_attr = \
-		container_of(attr, struct perf_pmu_events_attr, attr);
-
-	if (pmu_attr->event_str)
-		return sprintf(page, "%s", pmu_attr->event_str);
-
-	return 0;
-}
-
 RAPL_EVENT_ATTR_STR(energy-cores, rapl_cores, "event=0x01");
 RAPL_EVENT_ATTR_STR(energy-pkg  ,   rapl_pkg, "event=0x02");
 RAPL_EVENT_ATTR_STR(energy-ram  ,   rapl_ram, "event=0x03");