linux-kernel - [PATCH 9/9] perf/x86: Use update attribute groups for default attributes

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Date:   Sun, 12 May 2019 17:55:18 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andi Kleen <ak@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 9/9] perf/x86: Use update attribute groups for default attributes

Using the new pmu::update_attrs attribute group for default
attributes - freeze_on_smi, allow_tsx_force_abort.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 arch/x86/events/core.c       | 34 ----------------------------------
 arch/x86/events/intel/core.c |  9 +++++----
 arch/x86/events/perf_event.h |  3 ---
 3 files changed, 5 insertions(+), 41 deletions(-)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 7f1bb5fd1fc4..ce26da2ef11e 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -1618,32 +1618,6 @@ static struct attribute_group x86_pmu_format_group __ro_after_init = {
 	.attrs = NULL,
 };
 
-/* Merge two pointer arrays */
-__init struct attribute **merge_attr(struct attribute **a, struct attribute **b)
-{
-	struct attribute **new;
-	int j, i;
-
-	for (j = 0; a && a[j]; j++)
-		;
-	for (i = 0; b && b[i]; i++)
-		j++;
-	j++;
-
-	new = kmalloc_array(j, sizeof(struct attribute *), GFP_KERNEL);
-	if (!new)
-		return NULL;
-
-	j = 0;
-	for (i = 0; a && a[i]; i++)
-		new[j++] = a[i];
-	for (i = 0; b && b[i]; i++)
-		new[j++] = b[i];
-	new[j] = NULL;
-
-	return new;
-}
-
 ssize_t events_sysfs_show(struct device *dev, struct device_attribute *attr, char *page)
 {
 	struct perf_pmu_events_attr *pmu_attr = \
@@ -1824,14 +1798,6 @@ static int __init init_hw_perf_events(void)
 	if (!x86_pmu.events_sysfs_show)
 		x86_pmu_events_group.attrs = &empty_attrs;
 
-	if (x86_pmu.attrs) {
-		struct attribute **tmp;
-
-		tmp = merge_attr(x86_pmu_attr_group.attrs, x86_pmu.attrs);
-		if (!WARN_ON(!tmp))
-			x86_pmu_attr_group.attrs = tmp;
-	}
-
 	pmu.attr_update = x86_pmu.attr_update;
 
 	pr_info("... version:                %d\n",     x86_pmu.version);
diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 7db858c3bbec..e721be25abfb 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3888,8 +3888,6 @@ static __initconst const struct x86_pmu core_pmu = {
 	.check_period		= intel_pmu_check_period,
 };
 
-static struct attribute *intel_pmu_attrs[];
-
 static __initconst const struct x86_pmu intel_pmu = {
 	.name			= "Intel",
 	.handle_irq		= intel_pmu_handle_irq,
@@ -3921,8 +3919,6 @@ static __initconst const struct x86_pmu intel_pmu = {
 	.format_attrs		= intel_arch3_formats_attr,
 	.events_sysfs_show	= intel_event_sysfs_show,
 
-	.attrs			= intel_pmu_attrs,
-
 	.cpu_prepare		= intel_pmu_cpu_prepare,
 	.cpu_starting		= intel_pmu_cpu_starting,
 	.cpu_dying		= intel_pmu_cpu_dying,
@@ -4449,6 +4445,10 @@ static struct attribute_group group_format_extra_skl = {
 	.is_visible = exra_is_visible,
 };
 
+static struct attribute_group group_default = {
+	.attrs = intel_pmu_attrs,
+};
+
 static const struct attribute_group *attr_update[] = {
 	&group_events_td,
 	&group_events_mem,
@@ -4457,6 +4457,7 @@ static const struct attribute_group *attr_update[] = {
 	&group_caps_lbr,
 	&group_format_extra,
 	&group_format_extra_skl,
+	&group_default,
 	NULL,
 };
 
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index 1e3a7d74ea49..7ae2912f16de 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -636,7 +636,6 @@ struct x86_pmu {
 	const struct attribute_group **attr_update;
 
 	unsigned long	attr_freeze_on_smi;
-	struct attribute **attrs;
 
 	/*
 	 * CPU Hotplug hooks
@@ -903,8 +902,6 @@ static inline void set_linear_ip(struct pt_regs *regs, unsigned long ip)
 ssize_t x86_event_sysfs_show(char *page, u64 config, u64 event);
 ssize_t intel_event_sysfs_show(char *page, u64 config);
 
-struct attribute **merge_attr(struct attribute **a, struct attribute **b);
-
 ssize_t events_sysfs_show(struct device *dev, struct device_attribute *attr,
 			  char *page);
 ssize_t events_ht_sysfs_show(struct device *dev, struct device_attribute *attr,
-- 
2.20.1