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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * SMP support for ppc. | |
3 | * | |
4 | * Written by Cort Dougan (cort@cs.nmt.edu) borrowing a great | |
5 | * deal of code from the sparc and intel versions. | |
6 | * | |
7 | * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu> | |
8 | * | |
9 | * PowerPC-64 Support added by Dave Engebretsen, Peter Bergner, and | |
10 | * Mike Corrigan {engebret|bergner|mikec}@us.ibm.com | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License | |
14 | * as published by the Free Software Foundation; either version | |
15 | * 2 of the License, or (at your option) any later version. | |
16 | */ | |
17 | ||
18 | #undef DEBUG | |
19 | ||
1da177e4 LT |
20 | #include <linux/kernel.h> |
21 | #include <linux/module.h> | |
22 | #include <linux/sched.h> | |
23 | #include <linux/smp.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/delay.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/spinlock.h> | |
28 | #include <linux/cache.h> | |
29 | #include <linux/err.h> | |
30 | #include <linux/sysdev.h> | |
31 | #include <linux/cpu.h> | |
32 | #include <linux/notifier.h> | |
4b703a23 | 33 | #include <linux/topology.h> |
1da177e4 LT |
34 | |
35 | #include <asm/ptrace.h> | |
36 | #include <asm/atomic.h> | |
37 | #include <asm/irq.h> | |
38 | #include <asm/page.h> | |
39 | #include <asm/pgtable.h> | |
40 | #include <asm/prom.h> | |
41 | #include <asm/smp.h> | |
1da177e4 LT |
42 | #include <asm/time.h> |
43 | #include <asm/machdep.h> | |
44 | #include <asm/cputable.h> | |
45 | #include <asm/system.h> | |
bbeb3f4c | 46 | #include <asm/mpic.h> |
a7f290da | 47 | #include <asm/vdso_datapage.h> |
5ad57078 PM |
48 | #ifdef CONFIG_PPC64 |
49 | #include <asm/paca.h> | |
50 | #endif | |
51 | ||
1da177e4 | 52 | #ifdef DEBUG |
f9e4ec57 | 53 | #include <asm/udbg.h> |
1da177e4 LT |
54 | #define DBG(fmt...) udbg_printf(fmt) |
55 | #else | |
56 | #define DBG(fmt...) | |
57 | #endif | |
58 | ||
f9e4ec57 ME |
59 | int smp_hw_index[NR_CPUS]; |
60 | struct thread_info *secondary_ti; | |
61 | ||
1da177e4 LT |
62 | cpumask_t cpu_possible_map = CPU_MASK_NONE; |
63 | cpumask_t cpu_online_map = CPU_MASK_NONE; | |
64 | cpumask_t cpu_sibling_map[NR_CPUS] = { [0 ... NR_CPUS-1] = CPU_MASK_NONE }; | |
65 | ||
66 | EXPORT_SYMBOL(cpu_online_map); | |
67 | EXPORT_SYMBOL(cpu_possible_map); | |
68 | ||
5ad57078 | 69 | /* SMP operations for this machine */ |
1da177e4 LT |
70 | struct smp_ops_t *smp_ops; |
71 | ||
72 | static volatile unsigned int cpu_callin_map[NR_CPUS]; | |
73 | ||
1da177e4 LT |
74 | void smp_call_function_interrupt(void); |
75 | ||
76 | int smt_enabled_at_boot = 1; | |
77 | ||
cc532915 ME |
78 | static void (*crash_ipi_function_ptr)(struct pt_regs *) = NULL; |
79 | ||
cebf589c | 80 | #ifdef CONFIG_MPIC |
1da177e4 LT |
81 | int __init smp_mpic_probe(void) |
82 | { | |
83 | int nr_cpus; | |
84 | ||
85 | DBG("smp_mpic_probe()...\n"); | |
86 | ||
87 | nr_cpus = cpus_weight(cpu_possible_map); | |
88 | ||
89 | DBG("nr_cpus: %d\n", nr_cpus); | |
90 | ||
91 | if (nr_cpus > 1) | |
92 | mpic_request_ipis(); | |
93 | ||
94 | return nr_cpus; | |
95 | } | |
96 | ||
97 | void __devinit smp_mpic_setup_cpu(int cpu) | |
98 | { | |
99 | mpic_setup_this_cpu(); | |
100 | } | |
5ad57078 | 101 | #endif /* CONFIG_MPIC */ |
1da177e4 | 102 | |
5ad57078 | 103 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
104 | void __devinit smp_generic_kick_cpu(int nr) |
105 | { | |
106 | BUG_ON(nr < 0 || nr >= NR_CPUS); | |
107 | ||
108 | /* | |
109 | * The processor is currently spinning, waiting for the | |
110 | * cpu_start field to become non-zero After we set cpu_start, | |
111 | * the processor will continue on to secondary_start | |
112 | */ | |
113 | paca[nr].cpu_start = 1; | |
0d8d4d42 | 114 | smp_mb(); |
1da177e4 | 115 | } |
5ad57078 | 116 | #endif |
1da177e4 | 117 | |
1da177e4 LT |
118 | void smp_message_recv(int msg, struct pt_regs *regs) |
119 | { | |
120 | switch(msg) { | |
121 | case PPC_MSG_CALL_FUNCTION: | |
122 | smp_call_function_interrupt(); | |
123 | break; | |
5ad57078 | 124 | case PPC_MSG_RESCHEDULE: |
1da177e4 LT |
125 | /* XXX Do we have to do this? */ |
126 | set_need_resched(); | |
127 | break; | |
1da177e4 | 128 | case PPC_MSG_DEBUGGER_BREAK: |
cc532915 ME |
129 | if (crash_ipi_function_ptr) { |
130 | crash_ipi_function_ptr(regs); | |
131 | break; | |
132 | } | |
133 | #ifdef CONFIG_DEBUGGER | |
1da177e4 LT |
134 | debugger_ipi(regs); |
135 | break; | |
cc532915 ME |
136 | #endif /* CONFIG_DEBUGGER */ |
137 | /* FALLTHROUGH */ | |
1da177e4 LT |
138 | default: |
139 | printk("SMP %d: smp_message_recv(): unknown msg %d\n", | |
140 | smp_processor_id(), msg); | |
141 | break; | |
142 | } | |
143 | } | |
144 | ||
145 | void smp_send_reschedule(int cpu) | |
146 | { | |
147 | smp_ops->message_pass(cpu, PPC_MSG_RESCHEDULE); | |
148 | } | |
149 | ||
150 | #ifdef CONFIG_DEBUGGER | |
151 | void smp_send_debugger_break(int cpu) | |
152 | { | |
153 | smp_ops->message_pass(cpu, PPC_MSG_DEBUGGER_BREAK); | |
154 | } | |
155 | #endif | |
156 | ||
cc532915 ME |
157 | #ifdef CONFIG_KEXEC |
158 | void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *)) | |
159 | { | |
160 | crash_ipi_function_ptr = crash_ipi_callback; | |
161 | if (crash_ipi_callback) { | |
162 | mb(); | |
163 | smp_ops->message_pass(MSG_ALL_BUT_SELF, PPC_MSG_DEBUGGER_BREAK); | |
164 | } | |
165 | } | |
166 | #endif | |
167 | ||
1da177e4 LT |
168 | static void stop_this_cpu(void *dummy) |
169 | { | |
170 | local_irq_disable(); | |
171 | while (1) | |
172 | ; | |
173 | } | |
174 | ||
175 | void smp_send_stop(void) | |
176 | { | |
177 | smp_call_function(stop_this_cpu, NULL, 1, 0); | |
178 | } | |
179 | ||
180 | /* | |
181 | * Structure and data for smp_call_function(). This is designed to minimise | |
182 | * static memory requirements. It also looks cleaner. | |
183 | * Stolen from the i386 version. | |
184 | */ | |
185 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(call_lock); | |
186 | ||
187 | static struct call_data_struct { | |
188 | void (*func) (void *info); | |
189 | void *info; | |
190 | atomic_t started; | |
191 | atomic_t finished; | |
192 | int wait; | |
193 | } *call_data; | |
194 | ||
5ad57078 PM |
195 | /* delay of at least 8 seconds */ |
196 | #define SMP_CALL_TIMEOUT 8 | |
1da177e4 LT |
197 | |
198 | /* | |
199 | * This function sends a 'generic call function' IPI to all other CPUs | |
200 | * in the system. | |
201 | * | |
202 | * [SUMMARY] Run a function on all other CPUs. | |
203 | * <func> The function to run. This must be fast and non-blocking. | |
204 | * <info> An arbitrary pointer to pass to the function. | |
205 | * <nonatomic> currently unused. | |
206 | * <wait> If true, wait (atomically) until function has completed on other CPUs. | |
207 | * [RETURNS] 0 on success, else a negative status code. Does not return until | |
208 | * remote CPUs are nearly ready to execute <<func>> or are or have executed. | |
209 | * | |
210 | * You must not call this function with disabled interrupts or from a | |
211 | * hardware interrupt handler or from a bottom half handler. | |
212 | */ | |
213 | int smp_call_function (void (*func) (void *info), void *info, int nonatomic, | |
214 | int wait) | |
215 | { | |
216 | struct call_data_struct data; | |
217 | int ret = -1, cpus; | |
5ad57078 | 218 | u64 timeout; |
1da177e4 LT |
219 | |
220 | /* Can deadlock when called with interrupts disabled */ | |
221 | WARN_ON(irqs_disabled()); | |
222 | ||
223 | data.func = func; | |
224 | data.info = info; | |
225 | atomic_set(&data.started, 0); | |
226 | data.wait = wait; | |
227 | if (wait) | |
228 | atomic_set(&data.finished, 0); | |
229 | ||
230 | spin_lock(&call_lock); | |
231 | /* Must grab online cpu count with preempt disabled, otherwise | |
232 | * it can change. */ | |
233 | cpus = num_online_cpus() - 1; | |
234 | if (!cpus) { | |
235 | ret = 0; | |
236 | goto out; | |
237 | } | |
238 | ||
239 | call_data = &data; | |
0d8d4d42 | 240 | smp_wmb(); |
1da177e4 LT |
241 | /* Send a message to all other CPUs and wait for them to respond */ |
242 | smp_ops->message_pass(MSG_ALL_BUT_SELF, PPC_MSG_CALL_FUNCTION); | |
243 | ||
5ad57078 PM |
244 | timeout = get_tb() + (u64) SMP_CALL_TIMEOUT * tb_ticks_per_sec; |
245 | ||
1da177e4 | 246 | /* Wait for response */ |
1da177e4 LT |
247 | while (atomic_read(&data.started) != cpus) { |
248 | HMT_low(); | |
5ad57078 | 249 | if (get_tb() >= timeout) { |
1da177e4 LT |
250 | printk("smp_call_function on cpu %d: other cpus not " |
251 | "responding (%d)\n", smp_processor_id(), | |
252 | atomic_read(&data.started)); | |
253 | debugger(NULL); | |
254 | goto out; | |
255 | } | |
256 | } | |
257 | ||
258 | if (wait) { | |
1da177e4 LT |
259 | while (atomic_read(&data.finished) != cpus) { |
260 | HMT_low(); | |
5ad57078 | 261 | if (get_tb() >= timeout) { |
1da177e4 LT |
262 | printk("smp_call_function on cpu %d: other " |
263 | "cpus not finishing (%d/%d)\n", | |
264 | smp_processor_id(), | |
265 | atomic_read(&data.finished), | |
266 | atomic_read(&data.started)); | |
267 | debugger(NULL); | |
268 | goto out; | |
269 | } | |
270 | } | |
271 | } | |
272 | ||
273 | ret = 0; | |
274 | ||
5ad57078 | 275 | out: |
1da177e4 LT |
276 | call_data = NULL; |
277 | HMT_medium(); | |
278 | spin_unlock(&call_lock); | |
279 | return ret; | |
280 | } | |
281 | ||
282 | EXPORT_SYMBOL(smp_call_function); | |
283 | ||
284 | void smp_call_function_interrupt(void) | |
285 | { | |
286 | void (*func) (void *info); | |
287 | void *info; | |
288 | int wait; | |
289 | ||
290 | /* call_data will be NULL if the sender timed out while | |
291 | * waiting on us to receive the call. | |
292 | */ | |
293 | if (!call_data) | |
294 | return; | |
295 | ||
296 | func = call_data->func; | |
297 | info = call_data->info; | |
298 | wait = call_data->wait; | |
299 | ||
300 | if (!wait) | |
301 | smp_mb__before_atomic_inc(); | |
302 | ||
303 | /* | |
304 | * Notify initiating CPU that I've grabbed the data and am | |
305 | * about to execute the function | |
306 | */ | |
307 | atomic_inc(&call_data->started); | |
308 | /* | |
309 | * At this point the info structure may be out of scope unless wait==1 | |
310 | */ | |
311 | (*func)(info); | |
312 | if (wait) { | |
313 | smp_mb__before_atomic_inc(); | |
314 | atomic_inc(&call_data->finished); | |
315 | } | |
316 | } | |
317 | ||
1da177e4 LT |
318 | extern struct gettimeofday_struct do_gtod; |
319 | ||
320 | struct thread_info *current_set[NR_CPUS]; | |
321 | ||
322 | DECLARE_PER_CPU(unsigned int, pvr); | |
323 | ||
324 | static void __devinit smp_store_cpu_info(int id) | |
325 | { | |
326 | per_cpu(pvr, id) = mfspr(SPRN_PVR); | |
327 | } | |
328 | ||
329 | static void __init smp_create_idle(unsigned int cpu) | |
330 | { | |
331 | struct task_struct *p; | |
332 | ||
333 | /* create a process for the processor */ | |
334 | p = fork_idle(cpu); | |
335 | if (IS_ERR(p)) | |
336 | panic("failed fork for CPU %u: %li", cpu, PTR_ERR(p)); | |
5ad57078 | 337 | #ifdef CONFIG_PPC64 |
1da177e4 | 338 | paca[cpu].__current = p; |
5ad57078 | 339 | #endif |
b5e2fc1c AV |
340 | current_set[cpu] = task_thread_info(p); |
341 | task_thread_info(p)->cpu = cpu; | |
1da177e4 LT |
342 | } |
343 | ||
344 | void __init smp_prepare_cpus(unsigned int max_cpus) | |
345 | { | |
346 | unsigned int cpu; | |
347 | ||
348 | DBG("smp_prepare_cpus\n"); | |
349 | ||
350 | /* | |
351 | * setup_cpu may need to be called on the boot cpu. We havent | |
352 | * spun any cpus up but lets be paranoid. | |
353 | */ | |
354 | BUG_ON(boot_cpuid != smp_processor_id()); | |
355 | ||
356 | /* Fixup boot cpu */ | |
357 | smp_store_cpu_info(boot_cpuid); | |
358 | cpu_callin_map[boot_cpuid] = 1; | |
359 | ||
1da177e4 LT |
360 | max_cpus = smp_ops->probe(); |
361 | ||
362 | smp_space_timers(max_cpus); | |
363 | ||
0e551954 | 364 | for_each_possible_cpu(cpu) |
1da177e4 LT |
365 | if (cpu != boot_cpuid) |
366 | smp_create_idle(cpu); | |
367 | } | |
368 | ||
369 | void __devinit smp_prepare_boot_cpu(void) | |
370 | { | |
371 | BUG_ON(smp_processor_id() != boot_cpuid); | |
372 | ||
373 | cpu_set(boot_cpuid, cpu_online_map); | |
5ad57078 | 374 | #ifdef CONFIG_PPC64 |
1da177e4 | 375 | paca[boot_cpuid].__current = current; |
5ad57078 | 376 | #endif |
b5e2fc1c | 377 | current_set[boot_cpuid] = task_thread_info(current); |
1da177e4 LT |
378 | } |
379 | ||
380 | #ifdef CONFIG_HOTPLUG_CPU | |
381 | /* State of each CPU during hotplug phases */ | |
382 | DEFINE_PER_CPU(int, cpu_state) = { 0 }; | |
383 | ||
384 | int generic_cpu_disable(void) | |
385 | { | |
386 | unsigned int cpu = smp_processor_id(); | |
387 | ||
388 | if (cpu == boot_cpuid) | |
389 | return -EBUSY; | |
390 | ||
1da177e4 | 391 | cpu_clear(cpu, cpu_online_map); |
799d6046 | 392 | #ifdef CONFIG_PPC64 |
a7f290da | 393 | vdso_data->processorCount--; |
1da177e4 | 394 | fixup_irqs(cpu_online_map); |
094fe2e7 | 395 | #endif |
1da177e4 LT |
396 | return 0; |
397 | } | |
398 | ||
399 | int generic_cpu_enable(unsigned int cpu) | |
400 | { | |
401 | /* Do the normal bootup if we haven't | |
402 | * already bootstrapped. */ | |
403 | if (system_state != SYSTEM_RUNNING) | |
404 | return -ENOSYS; | |
405 | ||
406 | /* get the target out of it's holding state */ | |
407 | per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; | |
0d8d4d42 | 408 | smp_wmb(); |
1da177e4 LT |
409 | |
410 | while (!cpu_online(cpu)) | |
411 | cpu_relax(); | |
412 | ||
094fe2e7 | 413 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
414 | fixup_irqs(cpu_online_map); |
415 | /* counter the irq disable in fixup_irqs */ | |
416 | local_irq_enable(); | |
094fe2e7 | 417 | #endif |
1da177e4 LT |
418 | return 0; |
419 | } | |
420 | ||
421 | void generic_cpu_die(unsigned int cpu) | |
422 | { | |
423 | int i; | |
424 | ||
425 | for (i = 0; i < 100; i++) { | |
0d8d4d42 | 426 | smp_rmb(); |
1da177e4 LT |
427 | if (per_cpu(cpu_state, cpu) == CPU_DEAD) |
428 | return; | |
429 | msleep(100); | |
430 | } | |
431 | printk(KERN_ERR "CPU%d didn't die...\n", cpu); | |
432 | } | |
433 | ||
434 | void generic_mach_cpu_die(void) | |
435 | { | |
436 | unsigned int cpu; | |
437 | ||
438 | local_irq_disable(); | |
439 | cpu = smp_processor_id(); | |
440 | printk(KERN_DEBUG "CPU%d offline\n", cpu); | |
441 | __get_cpu_var(cpu_state) = CPU_DEAD; | |
0d8d4d42 | 442 | smp_wmb(); |
1da177e4 LT |
443 | while (__get_cpu_var(cpu_state) != CPU_UP_PREPARE) |
444 | cpu_relax(); | |
445 | ||
094fe2e7 | 446 | #ifdef CONFIG_PPC64 |
1da177e4 | 447 | flush_tlb_pending(); |
094fe2e7 | 448 | #endif |
1da177e4 LT |
449 | cpu_set(cpu, cpu_online_map); |
450 | local_irq_enable(); | |
451 | } | |
452 | #endif | |
453 | ||
454 | static int __devinit cpu_enable(unsigned int cpu) | |
455 | { | |
456 | if (smp_ops->cpu_enable) | |
457 | return smp_ops->cpu_enable(cpu); | |
458 | ||
459 | return -ENOSYS; | |
460 | } | |
461 | ||
462 | int __devinit __cpu_up(unsigned int cpu) | |
463 | { | |
464 | int c; | |
465 | ||
5ad57078 | 466 | secondary_ti = current_set[cpu]; |
1da177e4 LT |
467 | if (!cpu_enable(cpu)) |
468 | return 0; | |
469 | ||
470 | if (smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu)) | |
471 | return -EINVAL; | |
472 | ||
1da177e4 LT |
473 | /* Make sure callin-map entry is 0 (can be leftover a CPU |
474 | * hotplug | |
475 | */ | |
476 | cpu_callin_map[cpu] = 0; | |
477 | ||
478 | /* The information for processor bringup must | |
479 | * be written out to main store before we release | |
480 | * the processor. | |
481 | */ | |
0d8d4d42 | 482 | smp_mb(); |
1da177e4 LT |
483 | |
484 | /* wake up cpus */ | |
485 | DBG("smp: kicking cpu %d\n", cpu); | |
486 | smp_ops->kick_cpu(cpu); | |
487 | ||
488 | /* | |
489 | * wait to see if the cpu made a callin (is actually up). | |
490 | * use this value that I found through experimentation. | |
491 | * -- Cort | |
492 | */ | |
493 | if (system_state < SYSTEM_RUNNING) | |
ee0339f2 | 494 | for (c = 50000; c && !cpu_callin_map[cpu]; c--) |
1da177e4 LT |
495 | udelay(100); |
496 | #ifdef CONFIG_HOTPLUG_CPU | |
497 | else | |
498 | /* | |
499 | * CPUs can take much longer to come up in the | |
500 | * hotplug case. Wait five seconds. | |
501 | */ | |
502 | for (c = 25; c && !cpu_callin_map[cpu]; c--) { | |
503 | msleep(200); | |
504 | } | |
505 | #endif | |
506 | ||
507 | if (!cpu_callin_map[cpu]) { | |
508 | printk("Processor %u is stuck.\n", cpu); | |
509 | return -ENOENT; | |
510 | } | |
511 | ||
512 | printk("Processor %u found.\n", cpu); | |
513 | ||
514 | if (smp_ops->give_timebase) | |
515 | smp_ops->give_timebase(); | |
516 | ||
517 | /* Wait until cpu puts itself in the online map */ | |
518 | while (!cpu_online(cpu)) | |
519 | cpu_relax(); | |
520 | ||
521 | return 0; | |
522 | } | |
523 | ||
524 | ||
525 | /* Activate a secondary processor. */ | |
526 | int __devinit start_secondary(void *unused) | |
527 | { | |
528 | unsigned int cpu = smp_processor_id(); | |
529 | ||
530 | atomic_inc(&init_mm.mm_count); | |
531 | current->active_mm = &init_mm; | |
532 | ||
533 | smp_store_cpu_info(cpu); | |
5ad57078 | 534 | set_dec(tb_ticks_per_jiffy); |
e4d76e1c | 535 | preempt_disable(); |
1da177e4 LT |
536 | cpu_callin_map[cpu] = 1; |
537 | ||
538 | smp_ops->setup_cpu(cpu); | |
539 | if (smp_ops->take_timebase) | |
540 | smp_ops->take_timebase(); | |
541 | ||
7d4d6154 | 542 | if (system_state > SYSTEM_BOOTING) |
c6622f63 | 543 | snapshot_timebase(); |
7d4d6154 | 544 | |
1da177e4 LT |
545 | spin_lock(&call_lock); |
546 | cpu_set(cpu, cpu_online_map); | |
547 | spin_unlock(&call_lock); | |
548 | ||
549 | local_irq_enable(); | |
550 | ||
551 | cpu_idle(); | |
552 | return 0; | |
553 | } | |
554 | ||
555 | int setup_profiling_timer(unsigned int multiplier) | |
556 | { | |
557 | return 0; | |
558 | } | |
559 | ||
560 | void __init smp_cpus_done(unsigned int max_cpus) | |
561 | { | |
562 | cpumask_t old_mask; | |
563 | ||
564 | /* We want the setup_cpu() here to be called from CPU 0, but our | |
565 | * init thread may have been "borrowed" by another CPU in the meantime | |
566 | * se we pin us down to CPU 0 for a short while | |
567 | */ | |
568 | old_mask = current->cpus_allowed; | |
569 | set_cpus_allowed(current, cpumask_of_cpu(boot_cpuid)); | |
570 | ||
571 | smp_ops->setup_cpu(boot_cpuid); | |
572 | ||
573 | set_cpus_allowed(current, old_mask); | |
4b703a23 | 574 | |
c6622f63 PM |
575 | snapshot_timebases(); |
576 | ||
4b703a23 | 577 | dump_numa_cpu_topology(); |
1da177e4 LT |
578 | } |
579 | ||
580 | #ifdef CONFIG_HOTPLUG_CPU | |
581 | int __cpu_disable(void) | |
582 | { | |
583 | if (smp_ops->cpu_disable) | |
584 | return smp_ops->cpu_disable(); | |
585 | ||
586 | return -ENOSYS; | |
587 | } | |
588 | ||
589 | void __cpu_die(unsigned int cpu) | |
590 | { | |
591 | if (smp_ops->cpu_die) | |
592 | smp_ops->cpu_die(cpu); | |
593 | } | |
594 | #endif |