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: 836dc9e3fbbab0c30aa6e664417225f5c1fb1c39 authored by Linus Torvalds on 08 February 2013, 21:20:39 UTC
Linux 3.8-rc7
Linux 3.8-rc7
Tip revision: 836dc9e
hotplug.c
/*
* Copyright (C) 2002 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/kernel.h>
#include <linux/errno.h>
#include <linux/smp.h>
#include <asm/cacheflush.h>
#include <asm/smp_plat.h>
#include "common.h"
static inline void cpu_enter_lowpower(void)
{
/* Just flush the cache. Changing the coherency is not yet
* available on msm. */
flush_cache_all();
}
static inline void cpu_leave_lowpower(void)
{
}
static inline void platform_do_lowpower(unsigned int cpu)
{
/* Just enter wfi for now. TODO: Properly shut off the cpu. */
for (;;) {
/*
* here's the WFI
*/
asm("wfi"
:
:
: "memory", "cc");
if (pen_release == cpu_logical_map(cpu)) {
/*
* OK, proper wakeup, we're done
*/
break;
}
/*
* getting here, means that we have come out of WFI without
* having been woken up - this shouldn't happen
*
* The trouble is, letting people know about this is not really
* possible, since we are currently running incoherently, and
* therefore cannot safely call printk() or anything else
*/
pr_debug("CPU%u: spurious wakeup call\n", cpu);
}
}
/*
* platform-specific code to shutdown a CPU
*
* Called with IRQs disabled
*/
void __ref msm_cpu_die(unsigned int cpu)
{
/*
* we're ready for shutdown now, so do it
*/
cpu_enter_lowpower();
platform_do_lowpower(cpu);
/*
* bring this CPU back into the world of cache
* coherency, and then restore interrupts
*/
cpu_leave_lowpower();
}