drivers: Remove CONFIG_OPROFILE support

The "oprofile" user-space tools don't use the kernel OPROFILE support
any more, and haven't in a long time. User-space has been converted to
the perf interfaces.

Remove kernel's old oprofile support.

Suggested-by: Christoph Hellwig <hch@infradead.org>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Robert Richter <rric@kernel.org>
Acked-by: Paul E. McKenney <paulmck@kernel.org> #RCU
Acked-by: William Cohen <wcohen@redhat.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 0 insertions, 157 deletions

diff --git a/drivers/oprofile/nmi_timer_int.c b/drivers/oprofile/nmi_timer_int.c
deleted file mode 100644
index f343bd96609a..000000000000
--- a/drivers/oprofile/nmi_timer_int.c
+++ /dev/null
@@ -1,157 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/**
- * @file nmi_timer_int.c
- *
- * @remark Copyright 2011 Advanced Micro Devices, Inc.
- *
- * @author Robert Richter <robert.richter@amd.com>
- */
-
-#include <linux/init.h>
-#include <linux/smp.h>
-#include <linux/errno.h>
-#include <linux/oprofile.h>
-#include <linux/perf_event.h>
-
-#ifdef CONFIG_OPROFILE_NMI_TIMER
-
-static DEFINE_PER_CPU(struct perf_event *, nmi_timer_events);
-static int ctr_running;
-
-static struct perf_event_attr nmi_timer_attr = {
-	.type           = PERF_TYPE_HARDWARE,
-	.config         = PERF_COUNT_HW_CPU_CYCLES,
-	.size           = sizeof(struct perf_event_attr),
-	.pinned         = 1,
-	.disabled       = 1,
-};
-
-static void nmi_timer_callback(struct perf_event *event,
-			       struct perf_sample_data *data,
-			       struct pt_regs *regs)
-{
-	event->hw.interrupts = 0;       /* don't throttle interrupts */
-	oprofile_add_sample(regs, 0);
-}
-
-static int nmi_timer_start_cpu(int cpu)
-{
-	struct perf_event *event = per_cpu(nmi_timer_events, cpu);
-
-	if (!event) {
-		event = perf_event_create_kernel_counter(&nmi_timer_attr, cpu, NULL,
-							 nmi_timer_callback, NULL);
-		if (IS_ERR(event))
-			return PTR_ERR(event);
-		per_cpu(nmi_timer_events, cpu) = event;
-	}
-
-	if (event && ctr_running)
-		perf_event_enable(event);
-
-	return 0;
-}
-
-static void nmi_timer_stop_cpu(int cpu)
-{
-	struct perf_event *event = per_cpu(nmi_timer_events, cpu);
-
-	if (event && ctr_running)
-		perf_event_disable(event);
-}
-
-static int nmi_timer_cpu_online(unsigned int cpu)
-{
-	nmi_timer_start_cpu(cpu);
-	return 0;
-}
-static int nmi_timer_cpu_predown(unsigned int cpu)
-{
-	nmi_timer_stop_cpu(cpu);
-	return 0;
-}
-
-static int nmi_timer_start(void)
-{
-	int cpu;
-
-	get_online_cpus();
-	ctr_running = 1;
-	for_each_online_cpu(cpu)
-		nmi_timer_start_cpu(cpu);
-	put_online_cpus();
-
-	return 0;
-}
-
-static void nmi_timer_stop(void)
-{
-	int cpu;
-
-	get_online_cpus();
-	for_each_online_cpu(cpu)
-		nmi_timer_stop_cpu(cpu);
-	ctr_running = 0;
-	put_online_cpus();
-}
-
-static enum cpuhp_state hp_online;
-
-static void nmi_timer_shutdown(void)
-{
-	struct perf_event *event;
-	int cpu;
-
-	cpuhp_remove_state(hp_online);
-	for_each_possible_cpu(cpu) {
-		event = per_cpu(nmi_timer_events, cpu);
-		if (!event)
-			continue;
-		perf_event_disable(event);
-		per_cpu(nmi_timer_events, cpu) = NULL;
-		perf_event_release_kernel(event);
-	}
-}
-
-static int nmi_timer_setup(void)
-{
-	int err;
-	u64 period;
-
-	/* clock cycles per tick: */
-	period = (u64)cpu_khz * 1000;
-	do_div(period, HZ);
-	nmi_timer_attr.sample_period = period;
-
-	err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "oprofile/nmi:online",
-				nmi_timer_cpu_online, nmi_timer_cpu_predown);
-	if (err < 0) {
-		nmi_timer_shutdown();
-		return err;
-	}
-	hp_online = err;
-	return 0;
-}
-
-int __init op_nmi_timer_init(struct oprofile_operations *ops)
-{
-	int err = 0;
-
-	err = nmi_timer_setup();
-	if (err)
-		return err;
-	nmi_timer_shutdown();		/* only check, don't alloc */
-
-	ops->create_files	= NULL;
-	ops->setup		= nmi_timer_setup;
-	ops->shutdown		= nmi_timer_shutdown;
-	ops->start		= nmi_timer_start;
-	ops->stop		= nmi_timer_stop;
-	ops->cpu_type		= "timer";
-
-	printk(KERN_INFO "oprofile: using NMI timer interrupt.\n");
-
-	return 0;
-}
-
-#endif