linux/arch/arm/include/asm/localtimer.h
Russell King 10034aabca ARM: localtimer: clean up local timer on hot unplug
When a CPU is hot unplugged, the generic tick code cleans up the
clock event device, but fails to call down to the device's set_mode
function to actually shut the device down.

To work around this, we've historically had a local_timer_stop()
callback out of the hotplug code.  However, this adds needless
complexity when we have the clock event device itself available.

Explicitly call the clock event device's set_mode function with
CLOCK_EVT_MODE_UNUSED, so that the hardware can be cleanly shutdown
without any special external callbacks.  When/if the generic code
is fixed, percpu_timer_stop() can be killed off.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-12-20 15:09:16 +00:00

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C

/*
* arch/arm/include/asm/localtimer.h
*
* Copyright (C) 2004-2005 ARM Ltd.
*
* 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.
*/
#ifndef __ASM_ARM_LOCALTIMER_H
#define __ASM_ARM_LOCALTIMER_H
struct clock_event_device;
/*
* Setup a per-cpu timer, whether it be a local timer or dummy broadcast
*/
void percpu_timer_setup(void);
/*
* Called from assembly, this is the local timer IRQ handler
*/
asmlinkage void do_local_timer(struct pt_regs *);
#ifdef CONFIG_LOCAL_TIMERS
#ifdef CONFIG_HAVE_ARM_TWD
#include "smp_twd.h"
#define local_timer_ack() twd_timer_ack()
#else
/*
* Platform provides this to acknowledge a local timer IRQ.
* Returns true if the local timer IRQ is to be processed.
*/
int local_timer_ack(void);
#endif
/*
* Setup a local timer interrupt for a CPU.
*/
void local_timer_setup(struct clock_event_device *);
#endif
#endif