f4192bf2dc
Currently the smp_stop_cpu() function for SMP kernels enters a busy loop when "begin" is entered on the z/VM console after Linux is halted. To avoid this behavior, use the non-SMP variant of smp_stop_cpu() which stops the CPU again after "begin" is entered. As a side effect we now have consistent behavior for SMP and non-SMP Linux. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
78 lines
2 KiB
C
78 lines
2 KiB
C
/*
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* Copyright IBM Corp. 1999, 2012
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* Author(s): Denis Joseph Barrow,
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* Martin Schwidefsky <schwidefsky@de.ibm.com>,
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* Heiko Carstens <heiko.carstens@de.ibm.com>,
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*/
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#ifndef __ASM_SMP_H
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#define __ASM_SMP_H
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#include <asm/sigp.h>
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#ifdef CONFIG_SMP
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#include <asm/lowcore.h>
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#define raw_smp_processor_id() (S390_lowcore.cpu_nr)
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extern struct mutex smp_cpu_state_mutex;
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extern int __cpu_up(unsigned int cpu, struct task_struct *tidle);
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extern void arch_send_call_function_single_ipi(int cpu);
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extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
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extern void smp_call_online_cpu(void (*func)(void *), void *);
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extern void smp_call_ipl_cpu(void (*func)(void *), void *);
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extern int smp_find_processor_id(u16 address);
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extern int smp_store_status(int cpu);
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extern int smp_vcpu_scheduled(int cpu);
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extern void smp_yield_cpu(int cpu);
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extern void smp_yield(void);
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extern void smp_cpu_set_polarization(int cpu, int val);
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extern int smp_cpu_get_polarization(int cpu);
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extern void smp_fill_possible_mask(void);
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#else /* CONFIG_SMP */
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static inline void smp_call_ipl_cpu(void (*func)(void *), void *data)
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{
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func(data);
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}
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static inline void smp_call_online_cpu(void (*func)(void *), void *data)
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{
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func(data);
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}
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static inline int smp_find_processor_id(u16 address) { return 0; }
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static inline int smp_store_status(int cpu) { return 0; }
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static inline int smp_vcpu_scheduled(int cpu) { return 1; }
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static inline void smp_yield_cpu(int cpu) { }
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static inline void smp_yield(void) { }
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static inline void smp_fill_possible_mask(void) { }
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#endif /* CONFIG_SMP */
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static inline void smp_stop_cpu(void)
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{
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u16 pcpu = stap();
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for (;;) {
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__pcpu_sigp(pcpu, SIGP_STOP, 0, NULL);
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cpu_relax();
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}
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}
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#ifdef CONFIG_HOTPLUG_CPU
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extern int smp_rescan_cpus(void);
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extern void __noreturn cpu_die(void);
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extern void __cpu_die(unsigned int cpu);
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extern int __cpu_disable(void);
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#else
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static inline int smp_rescan_cpus(void) { return 0; }
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static inline void cpu_die(void) { }
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#endif
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#endif /* __ASM_SMP_H */
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