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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); | |
36ca4ba4 | 68 | EXPORT_SYMBOL(cpu_sibling_map); |
1da177e4 | 69 | |
5ad57078 | 70 | /* SMP operations for this machine */ |
1da177e4 LT |
71 | struct smp_ops_t *smp_ops; |
72 | ||
73 | static volatile unsigned int cpu_callin_map[NR_CPUS]; | |
74 | ||
1da177e4 LT |
75 | void smp_call_function_interrupt(void); |
76 | ||
77 | int smt_enabled_at_boot = 1; | |
78 | ||
cc532915 ME |
79 | static void (*crash_ipi_function_ptr)(struct pt_regs *) = NULL; |
80 | ||
5ad57078 | 81 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
82 | void __devinit smp_generic_kick_cpu(int nr) |
83 | { | |
84 | BUG_ON(nr < 0 || nr >= NR_CPUS); | |
85 | ||
86 | /* | |
87 | * The processor is currently spinning, waiting for the | |
88 | * cpu_start field to become non-zero After we set cpu_start, | |
89 | * the processor will continue on to secondary_start | |
90 | */ | |
91 | paca[nr].cpu_start = 1; | |
0d8d4d42 | 92 | smp_mb(); |
1da177e4 | 93 | } |
5ad57078 | 94 | #endif |
1da177e4 | 95 | |
7d12e780 | 96 | void smp_message_recv(int msg) |
1da177e4 LT |
97 | { |
98 | switch(msg) { | |
99 | case PPC_MSG_CALL_FUNCTION: | |
100 | smp_call_function_interrupt(); | |
101 | break; | |
5ad57078 | 102 | case PPC_MSG_RESCHEDULE: |
1da177e4 LT |
103 | /* XXX Do we have to do this? */ |
104 | set_need_resched(); | |
105 | break; | |
1da177e4 | 106 | case PPC_MSG_DEBUGGER_BREAK: |
cc532915 | 107 | if (crash_ipi_function_ptr) { |
7d12e780 | 108 | crash_ipi_function_ptr(get_irq_regs()); |
cc532915 ME |
109 | break; |
110 | } | |
111 | #ifdef CONFIG_DEBUGGER | |
7d12e780 | 112 | debugger_ipi(get_irq_regs()); |
1da177e4 | 113 | break; |
cc532915 ME |
114 | #endif /* CONFIG_DEBUGGER */ |
115 | /* FALLTHROUGH */ | |
1da177e4 LT |
116 | default: |
117 | printk("SMP %d: smp_message_recv(): unknown msg %d\n", | |
118 | smp_processor_id(), msg); | |
119 | break; | |
120 | } | |
121 | } | |
122 | ||
123 | void smp_send_reschedule(int cpu) | |
124 | { | |
8cffc6ac BH |
125 | if (likely(smp_ops)) |
126 | smp_ops->message_pass(cpu, PPC_MSG_RESCHEDULE); | |
1da177e4 LT |
127 | } |
128 | ||
129 | #ifdef CONFIG_DEBUGGER | |
130 | void smp_send_debugger_break(int cpu) | |
131 | { | |
8cffc6ac BH |
132 | if (likely(smp_ops)) |
133 | smp_ops->message_pass(cpu, PPC_MSG_DEBUGGER_BREAK); | |
1da177e4 LT |
134 | } |
135 | #endif | |
136 | ||
cc532915 ME |
137 | #ifdef CONFIG_KEXEC |
138 | void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *)) | |
139 | { | |
140 | crash_ipi_function_ptr = crash_ipi_callback; | |
8cffc6ac | 141 | if (crash_ipi_callback && smp_ops) { |
cc532915 ME |
142 | mb(); |
143 | smp_ops->message_pass(MSG_ALL_BUT_SELF, PPC_MSG_DEBUGGER_BREAK); | |
144 | } | |
145 | } | |
146 | #endif | |
147 | ||
1da177e4 LT |
148 | static void stop_this_cpu(void *dummy) |
149 | { | |
150 | local_irq_disable(); | |
151 | while (1) | |
152 | ; | |
153 | } | |
154 | ||
155 | void smp_send_stop(void) | |
156 | { | |
157 | smp_call_function(stop_this_cpu, NULL, 1, 0); | |
158 | } | |
159 | ||
160 | /* | |
161 | * Structure and data for smp_call_function(). This is designed to minimise | |
162 | * static memory requirements. It also looks cleaner. | |
163 | * Stolen from the i386 version. | |
164 | */ | |
165 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(call_lock); | |
166 | ||
167 | static struct call_data_struct { | |
168 | void (*func) (void *info); | |
169 | void *info; | |
170 | atomic_t started; | |
171 | atomic_t finished; | |
172 | int wait; | |
173 | } *call_data; | |
174 | ||
5ad57078 PM |
175 | /* delay of at least 8 seconds */ |
176 | #define SMP_CALL_TIMEOUT 8 | |
1da177e4 LT |
177 | |
178 | /* | |
179 | * This function sends a 'generic call function' IPI to all other CPUs | |
180 | * in the system. | |
181 | * | |
182 | * [SUMMARY] Run a function on all other CPUs. | |
183 | * <func> The function to run. This must be fast and non-blocking. | |
184 | * <info> An arbitrary pointer to pass to the function. | |
185 | * <nonatomic> currently unused. | |
186 | * <wait> If true, wait (atomically) until function has completed on other CPUs. | |
187 | * [RETURNS] 0 on success, else a negative status code. Does not return until | |
188 | * remote CPUs are nearly ready to execute <<func>> or are or have executed. | |
189 | * | |
190 | * You must not call this function with disabled interrupts or from a | |
191 | * hardware interrupt handler or from a bottom half handler. | |
192 | */ | |
193 | int smp_call_function (void (*func) (void *info), void *info, int nonatomic, | |
194 | int wait) | |
195 | { | |
196 | struct call_data_struct data; | |
197 | int ret = -1, cpus; | |
5ad57078 | 198 | u64 timeout; |
1da177e4 LT |
199 | |
200 | /* Can deadlock when called with interrupts disabled */ | |
201 | WARN_ON(irqs_disabled()); | |
202 | ||
8cffc6ac BH |
203 | if (unlikely(smp_ops == NULL)) |
204 | return -1; | |
205 | ||
1da177e4 LT |
206 | data.func = func; |
207 | data.info = info; | |
208 | atomic_set(&data.started, 0); | |
209 | data.wait = wait; | |
210 | if (wait) | |
211 | atomic_set(&data.finished, 0); | |
212 | ||
213 | spin_lock(&call_lock); | |
214 | /* Must grab online cpu count with preempt disabled, otherwise | |
215 | * it can change. */ | |
216 | cpus = num_online_cpus() - 1; | |
217 | if (!cpus) { | |
218 | ret = 0; | |
219 | goto out; | |
220 | } | |
221 | ||
222 | call_data = &data; | |
0d8d4d42 | 223 | smp_wmb(); |
1da177e4 LT |
224 | /* Send a message to all other CPUs and wait for them to respond */ |
225 | smp_ops->message_pass(MSG_ALL_BUT_SELF, PPC_MSG_CALL_FUNCTION); | |
226 | ||
5ad57078 PM |
227 | timeout = get_tb() + (u64) SMP_CALL_TIMEOUT * tb_ticks_per_sec; |
228 | ||
1da177e4 | 229 | /* Wait for response */ |
1da177e4 LT |
230 | while (atomic_read(&data.started) != cpus) { |
231 | HMT_low(); | |
5ad57078 | 232 | if (get_tb() >= timeout) { |
1da177e4 LT |
233 | printk("smp_call_function on cpu %d: other cpus not " |
234 | "responding (%d)\n", smp_processor_id(), | |
235 | atomic_read(&data.started)); | |
236 | debugger(NULL); | |
237 | goto out; | |
238 | } | |
239 | } | |
240 | ||
241 | if (wait) { | |
1da177e4 LT |
242 | while (atomic_read(&data.finished) != cpus) { |
243 | HMT_low(); | |
5ad57078 | 244 | if (get_tb() >= timeout) { |
1da177e4 LT |
245 | printk("smp_call_function on cpu %d: other " |
246 | "cpus not finishing (%d/%d)\n", | |
247 | smp_processor_id(), | |
248 | atomic_read(&data.finished), | |
249 | atomic_read(&data.started)); | |
250 | debugger(NULL); | |
251 | goto out; | |
252 | } | |
253 | } | |
254 | } | |
255 | ||
256 | ret = 0; | |
257 | ||
5ad57078 | 258 | out: |
1da177e4 LT |
259 | call_data = NULL; |
260 | HMT_medium(); | |
261 | spin_unlock(&call_lock); | |
262 | return ret; | |
263 | } | |
264 | ||
265 | EXPORT_SYMBOL(smp_call_function); | |
266 | ||
267 | void smp_call_function_interrupt(void) | |
268 | { | |
269 | void (*func) (void *info); | |
270 | void *info; | |
271 | int wait; | |
272 | ||
273 | /* call_data will be NULL if the sender timed out while | |
274 | * waiting on us to receive the call. | |
275 | */ | |
276 | if (!call_data) | |
277 | return; | |
278 | ||
279 | func = call_data->func; | |
280 | info = call_data->info; | |
281 | wait = call_data->wait; | |
282 | ||
283 | if (!wait) | |
284 | smp_mb__before_atomic_inc(); | |
285 | ||
286 | /* | |
287 | * Notify initiating CPU that I've grabbed the data and am | |
288 | * about to execute the function | |
289 | */ | |
290 | atomic_inc(&call_data->started); | |
291 | /* | |
292 | * At this point the info structure may be out of scope unless wait==1 | |
293 | */ | |
294 | (*func)(info); | |
295 | if (wait) { | |
296 | smp_mb__before_atomic_inc(); | |
297 | atomic_inc(&call_data->finished); | |
298 | } | |
299 | } | |
300 | ||
1da177e4 LT |
301 | extern struct gettimeofday_struct do_gtod; |
302 | ||
303 | struct thread_info *current_set[NR_CPUS]; | |
304 | ||
305 | DECLARE_PER_CPU(unsigned int, pvr); | |
306 | ||
307 | static void __devinit smp_store_cpu_info(int id) | |
308 | { | |
309 | per_cpu(pvr, id) = mfspr(SPRN_PVR); | |
310 | } | |
311 | ||
312 | static void __init smp_create_idle(unsigned int cpu) | |
313 | { | |
314 | struct task_struct *p; | |
315 | ||
316 | /* create a process for the processor */ | |
317 | p = fork_idle(cpu); | |
318 | if (IS_ERR(p)) | |
319 | panic("failed fork for CPU %u: %li", cpu, PTR_ERR(p)); | |
5ad57078 | 320 | #ifdef CONFIG_PPC64 |
1da177e4 | 321 | paca[cpu].__current = p; |
5ad57078 | 322 | #endif |
b5e2fc1c AV |
323 | current_set[cpu] = task_thread_info(p); |
324 | task_thread_info(p)->cpu = cpu; | |
1da177e4 LT |
325 | } |
326 | ||
327 | void __init smp_prepare_cpus(unsigned int max_cpus) | |
328 | { | |
329 | unsigned int cpu; | |
330 | ||
331 | DBG("smp_prepare_cpus\n"); | |
332 | ||
333 | /* | |
334 | * setup_cpu may need to be called on the boot cpu. We havent | |
335 | * spun any cpus up but lets be paranoid. | |
336 | */ | |
337 | BUG_ON(boot_cpuid != smp_processor_id()); | |
338 | ||
339 | /* Fixup boot cpu */ | |
340 | smp_store_cpu_info(boot_cpuid); | |
341 | cpu_callin_map[boot_cpuid] = 1; | |
342 | ||
8cffc6ac BH |
343 | if (smp_ops) |
344 | max_cpus = smp_ops->probe(); | |
345 | else | |
346 | max_cpus = 1; | |
1da177e4 LT |
347 | |
348 | smp_space_timers(max_cpus); | |
349 | ||
0e551954 | 350 | for_each_possible_cpu(cpu) |
1da177e4 LT |
351 | if (cpu != boot_cpuid) |
352 | smp_create_idle(cpu); | |
353 | } | |
354 | ||
355 | void __devinit smp_prepare_boot_cpu(void) | |
356 | { | |
357 | BUG_ON(smp_processor_id() != boot_cpuid); | |
358 | ||
359 | cpu_set(boot_cpuid, cpu_online_map); | |
5ad57078 | 360 | #ifdef CONFIG_PPC64 |
1da177e4 | 361 | paca[boot_cpuid].__current = current; |
5ad57078 | 362 | #endif |
b5e2fc1c | 363 | current_set[boot_cpuid] = task_thread_info(current); |
1da177e4 LT |
364 | } |
365 | ||
366 | #ifdef CONFIG_HOTPLUG_CPU | |
367 | /* State of each CPU during hotplug phases */ | |
368 | DEFINE_PER_CPU(int, cpu_state) = { 0 }; | |
369 | ||
370 | int generic_cpu_disable(void) | |
371 | { | |
372 | unsigned int cpu = smp_processor_id(); | |
373 | ||
374 | if (cpu == boot_cpuid) | |
375 | return -EBUSY; | |
376 | ||
1da177e4 | 377 | cpu_clear(cpu, cpu_online_map); |
799d6046 | 378 | #ifdef CONFIG_PPC64 |
a7f290da | 379 | vdso_data->processorCount--; |
1da177e4 | 380 | fixup_irqs(cpu_online_map); |
094fe2e7 | 381 | #endif |
1da177e4 LT |
382 | return 0; |
383 | } | |
384 | ||
385 | int generic_cpu_enable(unsigned int cpu) | |
386 | { | |
387 | /* Do the normal bootup if we haven't | |
388 | * already bootstrapped. */ | |
389 | if (system_state != SYSTEM_RUNNING) | |
390 | return -ENOSYS; | |
391 | ||
392 | /* get the target out of it's holding state */ | |
393 | per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; | |
0d8d4d42 | 394 | smp_wmb(); |
1da177e4 LT |
395 | |
396 | while (!cpu_online(cpu)) | |
397 | cpu_relax(); | |
398 | ||
094fe2e7 | 399 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
400 | fixup_irqs(cpu_online_map); |
401 | /* counter the irq disable in fixup_irqs */ | |
402 | local_irq_enable(); | |
094fe2e7 | 403 | #endif |
1da177e4 LT |
404 | return 0; |
405 | } | |
406 | ||
407 | void generic_cpu_die(unsigned int cpu) | |
408 | { | |
409 | int i; | |
410 | ||
411 | for (i = 0; i < 100; i++) { | |
0d8d4d42 | 412 | smp_rmb(); |
1da177e4 LT |
413 | if (per_cpu(cpu_state, cpu) == CPU_DEAD) |
414 | return; | |
415 | msleep(100); | |
416 | } | |
417 | printk(KERN_ERR "CPU%d didn't die...\n", cpu); | |
418 | } | |
419 | ||
420 | void generic_mach_cpu_die(void) | |
421 | { | |
422 | unsigned int cpu; | |
423 | ||
424 | local_irq_disable(); | |
425 | cpu = smp_processor_id(); | |
426 | printk(KERN_DEBUG "CPU%d offline\n", cpu); | |
427 | __get_cpu_var(cpu_state) = CPU_DEAD; | |
0d8d4d42 | 428 | smp_wmb(); |
1da177e4 LT |
429 | while (__get_cpu_var(cpu_state) != CPU_UP_PREPARE) |
430 | cpu_relax(); | |
1da177e4 LT |
431 | cpu_set(cpu, cpu_online_map); |
432 | local_irq_enable(); | |
433 | } | |
434 | #endif | |
435 | ||
436 | static int __devinit cpu_enable(unsigned int cpu) | |
437 | { | |
8cffc6ac | 438 | if (smp_ops && smp_ops->cpu_enable) |
1da177e4 LT |
439 | return smp_ops->cpu_enable(cpu); |
440 | ||
441 | return -ENOSYS; | |
442 | } | |
443 | ||
b282b6f8 | 444 | int __cpuinit __cpu_up(unsigned int cpu) |
1da177e4 LT |
445 | { |
446 | int c; | |
447 | ||
5ad57078 | 448 | secondary_ti = current_set[cpu]; |
1da177e4 LT |
449 | if (!cpu_enable(cpu)) |
450 | return 0; | |
451 | ||
8cffc6ac BH |
452 | if (smp_ops == NULL || |
453 | (smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu))) | |
1da177e4 LT |
454 | return -EINVAL; |
455 | ||
1da177e4 LT |
456 | /* Make sure callin-map entry is 0 (can be leftover a CPU |
457 | * hotplug | |
458 | */ | |
459 | cpu_callin_map[cpu] = 0; | |
460 | ||
461 | /* The information for processor bringup must | |
462 | * be written out to main store before we release | |
463 | * the processor. | |
464 | */ | |
0d8d4d42 | 465 | smp_mb(); |
1da177e4 LT |
466 | |
467 | /* wake up cpus */ | |
468 | DBG("smp: kicking cpu %d\n", cpu); | |
469 | smp_ops->kick_cpu(cpu); | |
470 | ||
471 | /* | |
472 | * wait to see if the cpu made a callin (is actually up). | |
473 | * use this value that I found through experimentation. | |
474 | * -- Cort | |
475 | */ | |
476 | if (system_state < SYSTEM_RUNNING) | |
ee0339f2 | 477 | for (c = 50000; c && !cpu_callin_map[cpu]; c--) |
1da177e4 LT |
478 | udelay(100); |
479 | #ifdef CONFIG_HOTPLUG_CPU | |
480 | else | |
481 | /* | |
482 | * CPUs can take much longer to come up in the | |
483 | * hotplug case. Wait five seconds. | |
484 | */ | |
485 | for (c = 25; c && !cpu_callin_map[cpu]; c--) { | |
486 | msleep(200); | |
487 | } | |
488 | #endif | |
489 | ||
490 | if (!cpu_callin_map[cpu]) { | |
491 | printk("Processor %u is stuck.\n", cpu); | |
492 | return -ENOENT; | |
493 | } | |
494 | ||
495 | printk("Processor %u found.\n", cpu); | |
496 | ||
497 | if (smp_ops->give_timebase) | |
498 | smp_ops->give_timebase(); | |
499 | ||
500 | /* Wait until cpu puts itself in the online map */ | |
501 | while (!cpu_online(cpu)) | |
502 | cpu_relax(); | |
503 | ||
504 | return 0; | |
505 | } | |
506 | ||
507 | ||
508 | /* Activate a secondary processor. */ | |
509 | int __devinit start_secondary(void *unused) | |
510 | { | |
511 | unsigned int cpu = smp_processor_id(); | |
512 | ||
513 | atomic_inc(&init_mm.mm_count); | |
514 | current->active_mm = &init_mm; | |
515 | ||
516 | smp_store_cpu_info(cpu); | |
5ad57078 | 517 | set_dec(tb_ticks_per_jiffy); |
e4d76e1c | 518 | preempt_disable(); |
1da177e4 LT |
519 | cpu_callin_map[cpu] = 1; |
520 | ||
521 | smp_ops->setup_cpu(cpu); | |
522 | if (smp_ops->take_timebase) | |
523 | smp_ops->take_timebase(); | |
524 | ||
7d4d6154 | 525 | if (system_state > SYSTEM_BOOTING) |
c6622f63 | 526 | snapshot_timebase(); |
7d4d6154 | 527 | |
1da177e4 LT |
528 | spin_lock(&call_lock); |
529 | cpu_set(cpu, cpu_online_map); | |
530 | spin_unlock(&call_lock); | |
531 | ||
532 | local_irq_enable(); | |
533 | ||
534 | cpu_idle(); | |
535 | return 0; | |
536 | } | |
537 | ||
538 | int setup_profiling_timer(unsigned int multiplier) | |
539 | { | |
540 | return 0; | |
541 | } | |
542 | ||
543 | void __init smp_cpus_done(unsigned int max_cpus) | |
544 | { | |
545 | cpumask_t old_mask; | |
546 | ||
547 | /* We want the setup_cpu() here to be called from CPU 0, but our | |
548 | * init thread may have been "borrowed" by another CPU in the meantime | |
549 | * se we pin us down to CPU 0 for a short while | |
550 | */ | |
551 | old_mask = current->cpus_allowed; | |
552 | set_cpus_allowed(current, cpumask_of_cpu(boot_cpuid)); | |
553 | ||
8cffc6ac BH |
554 | if (smp_ops) |
555 | smp_ops->setup_cpu(boot_cpuid); | |
1da177e4 LT |
556 | |
557 | set_cpus_allowed(current, old_mask); | |
4b703a23 | 558 | |
c6622f63 PM |
559 | snapshot_timebases(); |
560 | ||
4b703a23 | 561 | dump_numa_cpu_topology(); |
1da177e4 LT |
562 | } |
563 | ||
564 | #ifdef CONFIG_HOTPLUG_CPU | |
565 | int __cpu_disable(void) | |
566 | { | |
567 | if (smp_ops->cpu_disable) | |
568 | return smp_ops->cpu_disable(); | |
569 | ||
570 | return -ENOSYS; | |
571 | } | |
572 | ||
573 | void __cpu_die(unsigned int cpu) | |
574 | { | |
575 | if (smp_ops->cpu_die) | |
576 | smp_ops->cpu_die(cpu); | |
577 | } | |
578 | #endif |