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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>
51 lines
1,008 B
C
51 lines
1,008 B
C
/*
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* arch/arm/include/asm/localtimer.h
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*
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* Copyright (C) 2004-2005 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARM_LOCALTIMER_H
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#define __ASM_ARM_LOCALTIMER_H
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struct clock_event_device;
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/*
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* Setup a per-cpu timer, whether it be a local timer or dummy broadcast
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*/
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void percpu_timer_setup(void);
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/*
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* Called from assembly, this is the local timer IRQ handler
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*/
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asmlinkage void do_local_timer(struct pt_regs *);
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#ifdef CONFIG_LOCAL_TIMERS
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#ifdef CONFIG_HAVE_ARM_TWD
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#include "smp_twd.h"
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#define local_timer_ack() twd_timer_ack()
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#else
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/*
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* Platform provides this to acknowledge a local timer IRQ.
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* Returns true if the local timer IRQ is to be processed.
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*/
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int local_timer_ack(void);
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#endif
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/*
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* Setup a local timer interrupt for a CPU.
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*/
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void local_timer_setup(struct clock_event_device *);
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#endif
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#endif
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