Kernel  |  3.3

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#ifndef __LINUX_SMP_H
#define __LINUX_SMP_H

 *	Generic SMP support
 *		Alan Cox. <>

#include <linux/errno.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/cpumask.h>
#include <linux/init.h>

extern void cpu_idle(void);

typedef void (*smp_call_func_t)(void *info);
struct call_single_data {
	struct list_head list;
	smp_call_func_t func;
	void *info;
	u16 flags;
	u16 priv;

/* total number of cpus in this system (may exceed NR_CPUS) */
extern unsigned int total_cpus;

int smp_call_function_single(int cpuid, smp_call_func_t func, void *info,
			     int wait);


#include <linux/preempt.h>
#include <linux/kernel.h>
#include <linux/compiler.h>
#include <linux/thread_info.h>
#include <asm/smp.h>

 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
 * (defined in asm header):

 * stops all CPUs but the current one:
extern void smp_send_stop(void);

 * sends a 'reschedule' event to another CPU:
extern void smp_send_reschedule(int cpu);

 * Prepare machine for booting other CPUs.
extern void smp_prepare_cpus(unsigned int max_cpus);

 * Bring a CPU up
extern int __cpu_up(unsigned int cpunum);

 * Final polishing of CPUs
extern void smp_cpus_done(unsigned int max_cpus);

 * Call a function on all other processors
int smp_call_function(smp_call_func_t func, void *info, int wait);
void smp_call_function_many(const struct cpumask *mask,
			    smp_call_func_t func, void *info, bool wait);

void __smp_call_function_single(int cpuid, struct call_single_data *data,
				int wait);

int smp_call_function_any(const struct cpumask *mask,
			  smp_call_func_t func, void *info, int wait);

 * Generic and arch helpers
void __init call_function_init(void);
void generic_smp_call_function_single_interrupt(void);
void generic_smp_call_function_interrupt(void);
void ipi_call_lock(void);
void ipi_call_unlock(void);
void ipi_call_lock_irq(void);
void ipi_call_unlock_irq(void);
static inline void call_function_init(void) { }

 * Call a function on all processors
int on_each_cpu(smp_call_func_t func, void *info, int wait);

 * Mark the boot cpu "online" so that it can call console drivers in
 * printk() and can access its per-cpu storage.
void smp_prepare_boot_cpu(void);

extern unsigned int setup_max_cpus;
extern void __init setup_nr_cpu_ids(void);
extern void __init smp_init(void);

#else /* !SMP */

static inline void smp_send_stop(void) { }

 *	These macros fold the SMP functionality into a single CPU system
#define raw_smp_processor_id()			0
static inline int up_smp_call_function(smp_call_func_t func, void *info)
	return 0;
#define smp_call_function(func, info, wait) \
			(up_smp_call_function(func, info))
#define on_each_cpu(func,info,wait)		\
	({					\
		local_irq_disable();		\
		func(info);			\
		local_irq_enable();		\
		0;				\
static inline void smp_send_reschedule(int cpu) { }
#define num_booting_cpus()			1
#define smp_prepare_boot_cpu()			do {} while (0)
#define smp_call_function_many(mask, func, info, wait) \
			(up_smp_call_function(func, info))
static inline void call_function_init(void) { }

static inline int
smp_call_function_any(const struct cpumask *mask, smp_call_func_t func,
		      void *info, int wait)
	return smp_call_function_single(0, func, info, wait);

#endif /* !SMP */

 * smp_processor_id(): get the current CPU ID.
 * if DEBUG_PREEMPT is enabled then we check whether it is
 * used in a preemption-safe way. (smp_processor_id() is safe
 * if it's used in a preemption-off critical section, or in
 * a thread that is bound to the current CPU.)
 * NOTE: raw_smp_processor_id() is for internal use only
 * (smp_processor_id() is the preferred variant), but in rare
 * instances it might also be used to turn off false positives
 * (i.e. smp_processor_id() use that the debugging code reports but
 * which use for some reason is legal). Don't use this to hack around
 * the warning message, as your code might not work under PREEMPT.
  extern unsigned int debug_smp_processor_id(void);
# define smp_processor_id() debug_smp_processor_id()
# define smp_processor_id() raw_smp_processor_id()

#define get_cpu()		({ preempt_disable(); smp_processor_id(); })
#define put_cpu()		preempt_enable()

 * Callback to arch code if there's nosmp or maxcpus=0 on the
 * boot command line:
extern void arch_disable_smp_support(void);

void smp_setup_processor_id(void);

#endif /* __LINUX_SMP_H */