fa3f82c8bb
Various thing are torn down when a CPU is hot-unplugged. That CPU is expected to go back to start_secondary when re-plugged to re initialize everything, such as clock sources, maps, ... Some implementations just return from cpu_die() callback in the idle loop when the CPU is "re-plugged". This is not enough. We fix it using a little asm trampoline which resets the stack and calls back into start_secondary as if we were all fresh from boot. The trampoline already existed on ppc64, but we add it for ppc32 Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
38 lines
889 B
C
38 lines
889 B
C
#ifndef _OFFLINE_STATES_H_
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#define _OFFLINE_STATES_H_
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/* Cpu offline states go here */
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enum cpu_state_vals {
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CPU_STATE_OFFLINE,
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CPU_STATE_INACTIVE,
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CPU_STATE_ONLINE,
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CPU_MAX_OFFLINE_STATES
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};
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#ifdef CONFIG_HOTPLUG_CPU
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extern enum cpu_state_vals get_cpu_current_state(int cpu);
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extern void set_cpu_current_state(int cpu, enum cpu_state_vals state);
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extern void set_preferred_offline_state(int cpu, enum cpu_state_vals state);
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extern void set_default_offline_state(int cpu);
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#else
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static inline enum cpu_state_vals get_cpu_current_state(int cpu)
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{
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return CPU_STATE_ONLINE;
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}
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static inline void set_cpu_current_state(int cpu, enum cpu_state_vals state)
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{
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}
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static inline void set_preferred_offline_state(int cpu, enum cpu_state_vals state)
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{
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}
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static inline void set_default_offline_state(int cpu)
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{
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}
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#endif
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extern enum cpu_state_vals get_preferred_offline_state(int cpu);
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#endif
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