forked from Minki/linux
8c37bb3ac9
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
This removes all the drivers/clocksource and drivers/irqchip uses of
the __cpuinit macros from all C files.
[1] https://lkml.org/lkml/2013/5/20/589
Cc: John Stultz <john.stultz@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
|
|
* linux/drivers/clocksource/dummy_timer.c
|
|
*
|
|
* Copyright (C) 2013 ARM Ltd.
|
|
* All Rights Reserved
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/clockchips.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/init.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/cpumask.h>
|
|
|
|
static DEFINE_PER_CPU(struct clock_event_device, dummy_timer_evt);
|
|
|
|
static void dummy_timer_set_mode(enum clock_event_mode mode,
|
|
struct clock_event_device *evt)
|
|
{
|
|
/*
|
|
* Core clockevents code will call this when exchanging timer devices.
|
|
* We don't need to do anything here.
|
|
*/
|
|
}
|
|
|
|
static void dummy_timer_setup(void)
|
|
{
|
|
int cpu = smp_processor_id();
|
|
struct clock_event_device *evt = __this_cpu_ptr(&dummy_timer_evt);
|
|
|
|
evt->name = "dummy_timer";
|
|
evt->features = CLOCK_EVT_FEAT_PERIODIC |
|
|
CLOCK_EVT_FEAT_ONESHOT |
|
|
CLOCK_EVT_FEAT_DUMMY;
|
|
evt->rating = 100;
|
|
evt->set_mode = dummy_timer_set_mode;
|
|
evt->cpumask = cpumask_of(cpu);
|
|
|
|
clockevents_register_device(evt);
|
|
}
|
|
|
|
static int dummy_timer_cpu_notify(struct notifier_block *self,
|
|
unsigned long action, void *hcpu)
|
|
{
|
|
if ((action & ~CPU_TASKS_FROZEN) == CPU_STARTING)
|
|
dummy_timer_setup();
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block dummy_timer_cpu_nb = {
|
|
.notifier_call = dummy_timer_cpu_notify,
|
|
};
|
|
|
|
static int __init dummy_timer_register(void)
|
|
{
|
|
int err = register_cpu_notifier(&dummy_timer_cpu_nb);
|
|
if (err)
|
|
return err;
|
|
|
|
/* We won't get a call on the boot CPU, so register immediately */
|
|
if (num_possible_cpus() > 1)
|
|
dummy_timer_setup();
|
|
|
|
return 0;
|
|
}
|
|
early_initcall(dummy_timer_register);
|