https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: e40152ee1e1c7a63f4777791863215e3faa37a86 authored by Linus Torvalds on 16 May 2010, 21:17:36 UTC
Linus 2.6.34
Linus 2.6.34
Tip revision: e40152e
nmi_timer_int.c
/**
* @file nmi_timer_int.c
*
* @remark Copyright 2003 OProfile authors
* @remark Read the file COPYING
*
* @author Zwane Mwaikambo <zwane@linuxpower.ca>
*/
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/errno.h>
#include <linux/oprofile.h>
#include <linux/rcupdate.h>
#include <linux/kdebug.h>
#include <asm/nmi.h>
#include <asm/apic.h>
#include <asm/ptrace.h>
static int profile_timer_exceptions_notify(struct notifier_block *self,
unsigned long val, void *data)
{
struct die_args *args = (struct die_args *)data;
int ret = NOTIFY_DONE;
switch (val) {
case DIE_NMI:
oprofile_add_sample(args->regs, 0);
ret = NOTIFY_STOP;
break;
default:
break;
}
return ret;
}
static struct notifier_block profile_timer_exceptions_nb = {
.notifier_call = profile_timer_exceptions_notify,
.next = NULL,
.priority = 0
};
static int timer_start(void)
{
if (register_die_notifier(&profile_timer_exceptions_nb))
return 1;
return 0;
}
static void timer_stop(void)
{
unregister_die_notifier(&profile_timer_exceptions_nb);
synchronize_sched(); /* Allow already-started NMIs to complete. */
}
int __init op_nmi_timer_init(struct oprofile_operations *ops)
{
if ((nmi_watchdog != NMI_IO_APIC) || (atomic_read(&nmi_active) <= 0))
return -ENODEV;
ops->start = timer_start;
ops->stop = timer_stop;
ops->cpu_type = "timer";
printk(KERN_INFO "oprofile: using NMI timer interrupt.\n");
return 0;
}