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/* SPDX-License-Identifier: GPL-2.0 */
#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>
#include <linux/llist.h>
typedef void (*smp_call_func_t)(void *info);
struct __call_single_data {
struct llist_node llist;
smp_call_func_t func;
void *info;
unsigned int flags;
/* Use __aligned() to avoid to use 2 cache lines for 1 csd */
typedef struct __call_single_data call_single_data_t
__aligned(sizeof(struct __call_single_data));
/* 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);
* Call a function on all processors
int on_each_cpu(smp_call_func_t func, void *info, int wait);
* Call a function on processors specified by mask, which might include
* the local one.
void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func,
void *info, bool wait);
* Call a function on each processor for which the supplied function
* cond_func returns a positive value. This may include the local
* processor.
void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
smp_call_func_t func, void *info, bool wait,
gfp_t gfp_flags);
int smp_call_function_single_async(int cpu, call_single_data_t *csd);
#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, struct task_struct *tidle);
* 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);
int smp_call_function_any(const struct cpumask *mask,
smp_call_func_t func, void *info, int wait);
void kick_all_cpus_sync(void);
void wake_up_all_idle_cpus(void);
* Generic and arch helpers
void __init call_function_init(void);
void generic_smp_call_function_single_interrupt(void);
#define generic_smp_call_function_interrupt \
* 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);
extern int __boot_cpu_id;
static inline int get_boot_cpu_id(void)
return __boot_cpu_id;
#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))
static inline void smp_send_reschedule(int cpu) { }
#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);
static inline void kick_all_cpus_sync(void) { }
static inline void wake_up_all_idle_cpus(void) { }
extern void __init up_late_init(void);
static inline void smp_init(void) { up_late_init(); }
static inline void smp_init(void) { }
static inline int get_boot_cpu_id(void)
return 0;
#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);
extern void arch_enable_nonboot_cpus_begin(void);
extern void arch_enable_nonboot_cpus_end(void);
void smp_setup_processor_id(void);
int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par,
bool phys);
/* SMP core functions */
int smpcfd_prepare_cpu(unsigned int cpu);
int smpcfd_dead_cpu(unsigned int cpu);
int smpcfd_dying_cpu(unsigned int cpu);
#endif /* __LINUX_SMP_H */