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260 lines
6.4 KiB
260 lines
6.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __LINUX_SMP_H |
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#define __LINUX_SMP_H |
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/* |
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* Generic SMP support |
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* Alan Cox. <[email protected]> |
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*/ |
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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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#include <linux/smp_types.h> |
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typedef void (*smp_call_func_t)(void *info); |
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typedef bool (*smp_cond_func_t)(int cpu, void *info); |
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/* |
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* structure shares (partial) layout with struct irq_work |
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*/ |
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struct __call_single_data { |
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struct __call_single_node node; |
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smp_call_func_t func; |
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void *info; |
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}; |
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#define CSD_INIT(_func, _info) \ |
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(struct __call_single_data){ .func = (_func), .info = (_info), } |
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/* Use __aligned() to avoid to use 2 cache lines for 1 csd */ |
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typedef struct __call_single_data call_single_data_t |
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__aligned(sizeof(struct __call_single_data)); |
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#define INIT_CSD(_csd, _func, _info) \ |
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do { \ |
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*(_csd) = CSD_INIT((_func), (_info)); \ |
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} while (0) |
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/* |
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* Enqueue a llist_node on the call_single_queue; be very careful, read |
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* flush_smp_call_function_queue() in detail. |
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*/ |
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extern void __smp_call_single_queue(int cpu, struct llist_node *node); |
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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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int wait); |
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/* |
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* Call a function on all processors |
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*/ |
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void on_each_cpu(smp_call_func_t func, void *info, int wait); |
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/* |
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* Call a function on processors specified by mask, which might include |
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* the local one. |
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*/ |
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void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func, |
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void *info, bool wait); |
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/* |
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* Call a function on each processor for which the supplied function |
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* cond_func returns a positive value. This may include the local |
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* processor. |
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*/ |
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void on_each_cpu_cond(smp_cond_func_t cond_func, smp_call_func_t func, |
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void *info, bool wait); |
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void on_each_cpu_cond_mask(smp_cond_func_t cond_func, smp_call_func_t func, |
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void *info, bool wait, const struct cpumask *mask); |
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int smp_call_function_single_async(int cpu, struct __call_single_data *csd); |
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#ifdef CONFIG_SMP |
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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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#include <asm/smp.h> |
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/* |
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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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*/ |
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/* |
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* stops all CPUs but the current one: |
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*/ |
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extern void smp_send_stop(void); |
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/* |
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* sends a 'reschedule' event to another CPU: |
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*/ |
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extern void smp_send_reschedule(int cpu); |
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/* |
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* Prepare machine for booting other CPUs. |
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*/ |
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extern void smp_prepare_cpus(unsigned int max_cpus); |
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/* |
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* Bring a CPU up |
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*/ |
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extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle); |
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/* |
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* Final polishing of CPUs |
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*/ |
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extern void smp_cpus_done(unsigned int max_cpus); |
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/* |
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* Call a function on all other processors |
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*/ |
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void 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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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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void kick_all_cpus_sync(void); |
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void wake_up_all_idle_cpus(void); |
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/* |
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* Generic and arch helpers |
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*/ |
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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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#define generic_smp_call_function_interrupt \ |
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generic_smp_call_function_single_interrupt |
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/* |
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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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*/ |
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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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extern int __boot_cpu_id; |
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static inline int get_boot_cpu_id(void) |
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{ |
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return __boot_cpu_id; |
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} |
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#else /* !SMP */ |
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static inline void smp_send_stop(void) { } |
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/* |
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* These macros fold the SMP functionality into a single CPU system |
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*/ |
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#define raw_smp_processor_id() 0 |
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static inline void up_smp_call_function(smp_call_func_t func, void *info) |
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{ |
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} |
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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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static inline void smp_send_reschedule(int cpu) { } |
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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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static inline int |
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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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{ |
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return smp_call_function_single(0, func, info, wait); |
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} |
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static inline void kick_all_cpus_sync(void) { } |
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static inline void wake_up_all_idle_cpus(void) { } |
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#ifdef CONFIG_UP_LATE_INIT |
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extern void __init up_late_init(void); |
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static inline void smp_init(void) { up_late_init(); } |
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#else |
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static inline void smp_init(void) { } |
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#endif |
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static inline int get_boot_cpu_id(void) |
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{ |
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return 0; |
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} |
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#endif /* !SMP */ |
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/** |
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* raw_processor_id() - get the current (unstable) CPU id |
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* |
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* For then you know what you are doing and need an unstable |
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* CPU id. |
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*/ |
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/** |
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* smp_processor_id() - get the current (stable) CPU id |
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* |
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* This is the normal accessor to the CPU id and should be used |
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* whenever possible. |
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* |
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* The CPU id is stable when: |
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* |
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* - IRQs are disabled; |
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* - preemption is disabled; |
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* - the task is CPU affine. |
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* |
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* When CONFIG_DEBUG_PREEMPT; we verify these assumption and WARN |
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* when smp_processor_id() is used when the CPU id is not stable. |
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*/ |
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/* |
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* Allow the architecture to differentiate between a stable and unstable read. |
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* For example, x86 uses an IRQ-safe asm-volatile read for the unstable but a |
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* regular asm read for the stable. |
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*/ |
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#ifndef __smp_processor_id |
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#define __smp_processor_id(x) raw_smp_processor_id(x) |
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#endif |
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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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#else |
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# define smp_processor_id() __smp_processor_id() |
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#endif |
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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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/* |
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* Callback to arch code if there's nosmp or maxcpus=0 on the |
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* boot command line: |
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*/ |
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extern void arch_disable_smp_support(void); |
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extern void arch_thaw_secondary_cpus_begin(void); |
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extern void arch_thaw_secondary_cpus_end(void); |
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void smp_setup_processor_id(void); |
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int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, |
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bool phys); |
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/* SMP core functions */ |
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int smpcfd_prepare_cpu(unsigned int cpu); |
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int smpcfd_dead_cpu(unsigned int cpu); |
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int smpcfd_dying_cpu(unsigned int cpu); |
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#endif /* __LINUX_SMP_H */
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