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* Alan Cox. <alan@redhat.com>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/cpumask.h>
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#include <linux/init.h>
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extern void cpu_idle(void);
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typedef void (*smp_call_func_t)(void *info);
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struct call_single_data {
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struct list_head list;
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/* total number of cpus in this system (may exceed NR_CPUS) */
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extern unsigned int total_cpus;
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int smp_call_function_single(int cpuid, smp_call_func_t func, void *info,
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#include <linux/preempt.h>
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#include <linux/kernel.h>
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#include <linux/compiler.h>
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#include <linux/thread_info.h>
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* main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
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* (defined in asm header):
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* stops all CPUs but the current one:
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extern void smp_send_stop(void);
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* sends a 'reschedule' event to another CPU:
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extern void smp_send_reschedule(int cpu);
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* Prepare machine for booting other CPUs.
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extern void smp_prepare_cpus(unsigned int max_cpus);
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extern int __cpu_up(unsigned int cpunum);
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* Final polishing of CPUs
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extern void smp_cpus_done(unsigned int max_cpus);
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* Call a function on all other processors
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int smp_call_function(smp_call_func_t func, void *info, int wait);
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void smp_call_function_many(const struct cpumask *mask,
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smp_call_func_t func, void *info, bool wait);
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void __smp_call_function_single(int cpuid, struct call_single_data *data,
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int smp_call_function_any(const struct cpumask *mask,
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smp_call_func_t func, void *info, int wait);
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* Generic and arch helpers
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#ifdef CONFIG_USE_GENERIC_SMP_HELPERS
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void __init call_function_init(void);
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void generic_smp_call_function_single_interrupt(void);
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void generic_smp_call_function_interrupt(void);
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void ipi_call_lock(void);
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void ipi_call_unlock(void);
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void ipi_call_lock_irq(void);
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void ipi_call_unlock_irq(void);
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static inline void call_function_init(void) { }
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* Call a function on all processors
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int on_each_cpu(smp_call_func_t func, void *info, int wait);
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* Mark the boot cpu "online" so that it can call console drivers in
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* printk() and can access its per-cpu storage.
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void smp_prepare_boot_cpu(void);
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extern unsigned int setup_max_cpus;
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extern void __init setup_nr_cpu_ids(void);
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extern void __init smp_init(void);
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static inline void smp_send_stop(void) { }
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* These macros fold the SMP functionality into a single CPU system
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#define raw_smp_processor_id() 0
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static inline int up_smp_call_function(smp_call_func_t func, void *info)
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#define smp_call_function(func, info, wait) \
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(up_smp_call_function(func, info))
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#define on_each_cpu(func,info,wait) \
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local_irq_disable(); \
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local_irq_enable(); \
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static inline void smp_send_reschedule(int cpu) { }
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#define num_booting_cpus() 1
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#define smp_prepare_boot_cpu() do {} while (0)
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#define smp_call_function_many(mask, func, info, wait) \
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(up_smp_call_function(func, info))
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static inline void call_function_init(void) { }
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smp_call_function_any(const struct cpumask *mask, smp_call_func_t func,
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void *info, int wait)
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return smp_call_function_single(0, func, info, wait);
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* smp_processor_id(): get the current CPU ID.
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* if DEBUG_PREEMPT is enabled then we check whether it is
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* used in a preemption-safe way. (smp_processor_id() is safe
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* if it's used in a preemption-off critical section, or in
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* a thread that is bound to the current CPU.)
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* NOTE: raw_smp_processor_id() is for internal use only
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* (smp_processor_id() is the preferred variant), but in rare
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* instances it might also be used to turn off false positives
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* (i.e. smp_processor_id() use that the debugging code reports but
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* which use for some reason is legal). Don't use this to hack around
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* the warning message, as your code might not work under PREEMPT.
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#ifdef CONFIG_DEBUG_PREEMPT
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extern unsigned int debug_smp_processor_id(void);
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# define smp_processor_id() debug_smp_processor_id()
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# define smp_processor_id() raw_smp_processor_id()
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#define get_cpu() ({ preempt_disable(); smp_processor_id(); })
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#define put_cpu() preempt_enable()
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* Callback to arch code if there's nosmp or maxcpus=0 on the
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extern void arch_disable_smp_support(void);
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void smp_setup_processor_id(void);
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#endif /* __LINUX_SMP_H */