]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - include/linux/smp.h
6 * Alan Cox. <alan@redhat.com>
9 #include <linux/errno.h>
10 #include <asm/system.h>
12 extern void cpu_idle(void);
16 #include <linux/preempt.h>
17 #include <linux/kernel.h>
18 #include <linux/compiler.h>
19 #include <linux/thread_info.h>
23 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
24 * (defined in asm header):
28 * stops all CPUs but the current one:
30 extern void smp_send_stop(void);
33 * sends a 'reschedule' event to another CPU:
35 extern void smp_send_reschedule(int cpu
);
39 * Prepare machine for booting other CPUs.
41 extern void smp_prepare_cpus(unsigned int max_cpus
);
46 extern int __cpu_up(unsigned int cpunum
);
49 * Final polishing of CPUs
51 extern void smp_cpus_done(unsigned int max_cpus
);
54 * Call a function on all other processors
56 int smp_call_function(void(*func
)(void *info
), void *info
, int retry
, int wait
);
58 int smp_call_function_single(int cpuid
, void (*func
) (void *info
), void *info
,
62 * Call a function on all processors
64 int on_each_cpu(void (*func
) (void *info
), void *info
, int retry
, int wait
);
66 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */
67 #define MSG_ALL 0x8001
69 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */
70 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's
73 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/
74 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */
77 * Mark the boot cpu "online" so that it can call console drivers in
78 * printk() and can access its per-cpu storage.
80 void smp_prepare_boot_cpu(void);
85 * These macros fold the SMP functionality into a single CPU system
87 #define raw_smp_processor_id() 0
88 static inline int up_smp_call_function(void)
92 #define smp_call_function(func,info,retry,wait) (up_smp_call_function())
93 #define on_each_cpu(func,info,retry,wait) \
95 local_irq_disable(); \
100 static inline void smp_send_reschedule(int cpu
) { }
101 #define num_booting_cpus() 1
102 #define smp_prepare_boot_cpu() do {} while (0)
103 static inline int smp_call_function_single(int cpuid
, void (*func
) (void *info
),
104 void *info
, int retry
, int wait
)
116 * smp_processor_id(): get the current CPU ID.
118 * if DEBUG_PREEMPT is enabled the we check whether it is
119 * used in a preemption-safe way. (smp_processor_id() is safe
120 * if it's used in a preemption-off critical section, or in
121 * a thread that is bound to the current CPU.)
123 * NOTE: raw_smp_processor_id() is for internal use only
124 * (smp_processor_id() is the preferred variant), but in rare
125 * instances it might also be used to turn off false positives
126 * (i.e. smp_processor_id() use that the debugging code reports but
127 * which use for some reason is legal). Don't use this to hack around
128 * the warning message, as your code might not work under PREEMPT.
130 #ifdef CONFIG_DEBUG_PREEMPT
131 extern unsigned int debug_smp_processor_id(void);
132 # define smp_processor_id() debug_smp_processor_id()
134 # define smp_processor_id() raw_smp_processor_id()
137 #define get_cpu() ({ preempt_disable(); smp_processor_id(); })
138 #define put_cpu() preempt_enable()
139 #define put_cpu_no_resched() preempt_enable_no_resched()
141 void smp_setup_processor_id(void);
143 #endif /* __LINUX_SMP_H */