]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | ** SMP Support | |
3 | ** | |
4 | ** Copyright (C) 1999 Walt Drummond <drummond@valinux.com> | |
5 | ** Copyright (C) 1999 David Mosberger-Tang <davidm@hpl.hp.com> | |
6 | ** Copyright (C) 2001,2004 Grant Grundler <grundler@parisc-linux.org> | |
7 | ** | |
8 | ** Lots of stuff stolen from arch/alpha/kernel/smp.c | |
9 | ** ...and then parisc stole from arch/ia64/kernel/smp.c. Thanks David! :^) | |
10 | ** | |
7022672e | 11 | ** Thanks to John Curry and Ullas Ponnadi. I learned a lot from their work. |
1da177e4 LT |
12 | ** -grant (1/12/2001) |
13 | ** | |
14 | ** This program is free software; you can redistribute it and/or modify | |
15 | ** it under the terms of the GNU General Public License as published by | |
16 | ** the Free Software Foundation; either version 2 of the License, or | |
17 | ** (at your option) any later version. | |
18 | */ | |
1da177e4 LT |
19 | #include <linux/types.h> |
20 | #include <linux/spinlock.h> | |
21 | #include <linux/slab.h> | |
22 | ||
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/sched.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/interrupt.h> | |
28 | #include <linux/smp.h> | |
29 | #include <linux/kernel_stat.h> | |
30 | #include <linux/mm.h> | |
31 | #include <linux/delay.h> | |
32 | #include <linux/bitops.h> | |
33 | ||
34 | #include <asm/system.h> | |
35 | #include <asm/atomic.h> | |
36 | #include <asm/current.h> | |
37 | #include <asm/delay.h> | |
1b2425e3 | 38 | #include <asm/tlbflush.h> |
1da177e4 LT |
39 | |
40 | #include <asm/io.h> | |
41 | #include <asm/irq.h> /* for CPU_IRQ_REGION and friends */ | |
42 | #include <asm/mmu_context.h> | |
43 | #include <asm/page.h> | |
44 | #include <asm/pgtable.h> | |
45 | #include <asm/pgalloc.h> | |
46 | #include <asm/processor.h> | |
47 | #include <asm/ptrace.h> | |
48 | #include <asm/unistd.h> | |
49 | #include <asm/cacheflush.h> | |
50 | ||
5492a0f0 KM |
51 | #undef DEBUG_SMP |
52 | #ifdef DEBUG_SMP | |
53 | static int smp_debug_lvl = 0; | |
54 | #define smp_debug(lvl, printargs...) \ | |
55 | if (lvl >= smp_debug_lvl) \ | |
56 | printk(printargs); | |
57 | #else | |
58 | #define smp_debug(lvl, ...) | |
59 | #endif /* DEBUG_SMP */ | |
1da177e4 LT |
60 | |
61 | DEFINE_SPINLOCK(smp_lock); | |
62 | ||
63 | volatile struct task_struct *smp_init_current_idle_task; | |
64 | ||
8039de10 | 65 | static volatile int cpu_now_booting __read_mostly = 0; /* track which CPU is booting */ |
1da177e4 | 66 | |
8039de10 | 67 | static int parisc_max_cpus __read_mostly = 1; |
1da177e4 LT |
68 | |
69 | /* online cpus are ones that we've managed to bring up completely | |
70 | * possible cpus are all valid cpu | |
71 | * present cpus are all detected cpu | |
72 | * | |
73 | * On startup we bring up the "possible" cpus. Since we discover | |
74 | * CPUs later, we add them as hotplug, so the possible cpu mask is | |
75 | * empty in the beginning. | |
76 | */ | |
77 | ||
8039de10 HD |
78 | cpumask_t cpu_online_map __read_mostly = CPU_MASK_NONE; /* Bitmap of online CPUs */ |
79 | cpumask_t cpu_possible_map __read_mostly = CPU_MASK_ALL; /* Bitmap of Present CPUs */ | |
1da177e4 LT |
80 | |
81 | EXPORT_SYMBOL(cpu_online_map); | |
82 | EXPORT_SYMBOL(cpu_possible_map); | |
83 | ||
3c97b5e9 | 84 | DEFINE_PER_CPU(spinlock_t, ipi_lock) = SPIN_LOCK_UNLOCKED; |
1da177e4 LT |
85 | |
86 | struct smp_call_struct { | |
87 | void (*func) (void *info); | |
88 | void *info; | |
89 | long wait; | |
90 | atomic_t unstarted_count; | |
91 | atomic_t unfinished_count; | |
92 | }; | |
93 | static volatile struct smp_call_struct *smp_call_function_data; | |
94 | ||
95 | enum ipi_message_type { | |
96 | IPI_NOP=0, | |
97 | IPI_RESCHEDULE=1, | |
98 | IPI_CALL_FUNC, | |
99 | IPI_CPU_START, | |
100 | IPI_CPU_STOP, | |
101 | IPI_CPU_TEST | |
102 | }; | |
103 | ||
104 | ||
105 | /********** SMP inter processor interrupt and communication routines */ | |
106 | ||
107 | #undef PER_CPU_IRQ_REGION | |
108 | #ifdef PER_CPU_IRQ_REGION | |
109 | /* XXX REVISIT Ignore for now. | |
110 | ** *May* need this "hook" to register IPI handler | |
111 | ** once we have perCPU ExtIntr switch tables. | |
112 | */ | |
113 | static void | |
114 | ipi_init(int cpuid) | |
115 | { | |
1da177e4 LT |
116 | #error verify IRQ_OFFSET(IPI_IRQ) is ipi_interrupt() in new IRQ region |
117 | ||
118 | if(cpu_online(cpuid) ) | |
119 | { | |
120 | switch_to_idle_task(current); | |
121 | } | |
122 | ||
123 | return; | |
124 | } | |
125 | #endif | |
126 | ||
127 | ||
128 | /* | |
129 | ** Yoink this CPU from the runnable list... | |
130 | ** | |
131 | */ | |
132 | static void | |
133 | halt_processor(void) | |
134 | { | |
1da177e4 LT |
135 | /* REVISIT : redirect I/O Interrupts to another CPU? */ |
136 | /* REVISIT : does PM *know* this CPU isn't available? */ | |
137 | cpu_clear(smp_processor_id(), cpu_online_map); | |
138 | local_irq_disable(); | |
139 | for (;;) | |
140 | ; | |
1da177e4 LT |
141 | } |
142 | ||
143 | ||
144 | irqreturn_t | |
c7753f18 | 145 | ipi_interrupt(int irq, void *dev_id) |
1da177e4 LT |
146 | { |
147 | int this_cpu = smp_processor_id(); | |
148 | struct cpuinfo_parisc *p = &cpu_data[this_cpu]; | |
149 | unsigned long ops; | |
150 | unsigned long flags; | |
151 | ||
152 | /* Count this now; we may make a call that never returns. */ | |
153 | p->ipi_count++; | |
154 | ||
155 | mb(); /* Order interrupt and bit testing. */ | |
156 | ||
157 | for (;;) { | |
3c97b5e9 KM |
158 | spinlock_t *lock = &per_cpu(ipi_lock, this_cpu); |
159 | spin_lock_irqsave(lock, flags); | |
1da177e4 LT |
160 | ops = p->pending_ipi; |
161 | p->pending_ipi = 0; | |
3c97b5e9 | 162 | spin_unlock_irqrestore(lock, flags); |
1da177e4 LT |
163 | |
164 | mb(); /* Order bit clearing and data access. */ | |
165 | ||
166 | if (!ops) | |
167 | break; | |
168 | ||
169 | while (ops) { | |
170 | unsigned long which = ffz(~ops); | |
171 | ||
d911aed8 JB |
172 | ops &= ~(1 << which); |
173 | ||
1da177e4 | 174 | switch (which) { |
d911aed8 | 175 | case IPI_NOP: |
5492a0f0 | 176 | smp_debug(100, KERN_DEBUG "CPU%d IPI_NOP\n", this_cpu); |
d911aed8 JB |
177 | break; |
178 | ||
1da177e4 | 179 | case IPI_RESCHEDULE: |
5492a0f0 | 180 | smp_debug(100, KERN_DEBUG "CPU%d IPI_RESCHEDULE\n", this_cpu); |
1da177e4 LT |
181 | /* |
182 | * Reschedule callback. Everything to be | |
183 | * done is done by the interrupt return path. | |
184 | */ | |
185 | break; | |
186 | ||
187 | case IPI_CALL_FUNC: | |
5492a0f0 | 188 | smp_debug(100, KERN_DEBUG "CPU%d IPI_CALL_FUNC\n", this_cpu); |
1da177e4 LT |
189 | { |
190 | volatile struct smp_call_struct *data; | |
191 | void (*func)(void *info); | |
192 | void *info; | |
193 | int wait; | |
194 | ||
195 | data = smp_call_function_data; | |
196 | func = data->func; | |
197 | info = data->info; | |
198 | wait = data->wait; | |
199 | ||
200 | mb(); | |
201 | atomic_dec ((atomic_t *)&data->unstarted_count); | |
202 | ||
203 | /* At this point, *data can't | |
204 | * be relied upon. | |
205 | */ | |
206 | ||
207 | (*func)(info); | |
208 | ||
209 | /* Notify the sending CPU that the | |
210 | * task is done. | |
211 | */ | |
212 | mb(); | |
213 | if (wait) | |
214 | atomic_dec ((atomic_t *)&data->unfinished_count); | |
215 | } | |
216 | break; | |
217 | ||
218 | case IPI_CPU_START: | |
5492a0f0 | 219 | smp_debug(100, KERN_DEBUG "CPU%d IPI_CPU_START\n", this_cpu); |
1da177e4 LT |
220 | break; |
221 | ||
222 | case IPI_CPU_STOP: | |
5492a0f0 | 223 | smp_debug(100, KERN_DEBUG "CPU%d IPI_CPU_STOP\n", this_cpu); |
1da177e4 | 224 | halt_processor(); |
1da177e4 LT |
225 | break; |
226 | ||
227 | case IPI_CPU_TEST: | |
5492a0f0 | 228 | smp_debug(100, KERN_DEBUG "CPU%d is alive!\n", this_cpu); |
1da177e4 LT |
229 | break; |
230 | ||
231 | default: | |
232 | printk(KERN_CRIT "Unknown IPI num on CPU%d: %lu\n", | |
233 | this_cpu, which); | |
1da177e4 LT |
234 | return IRQ_NONE; |
235 | } /* Switch */ | |
7085689e JB |
236 | /* let in any pending interrupts */ |
237 | local_irq_enable(); | |
238 | local_irq_disable(); | |
1da177e4 LT |
239 | } /* while (ops) */ |
240 | } | |
241 | return IRQ_HANDLED; | |
242 | } | |
243 | ||
244 | ||
245 | static inline void | |
246 | ipi_send(int cpu, enum ipi_message_type op) | |
247 | { | |
248 | struct cpuinfo_parisc *p = &cpu_data[cpu]; | |
3c97b5e9 | 249 | spinlock_t *lock = &per_cpu(ipi_lock, cpu); |
1da177e4 LT |
250 | unsigned long flags; |
251 | ||
3c97b5e9 | 252 | spin_lock_irqsave(lock, flags); |
1da177e4 LT |
253 | p->pending_ipi |= 1 << op; |
254 | gsc_writel(IPI_IRQ - CPU_IRQ_BASE, cpu_data[cpu].hpa); | |
3c97b5e9 | 255 | spin_unlock_irqrestore(lock, flags); |
1da177e4 LT |
256 | } |
257 | ||
258 | ||
259 | static inline void | |
260 | send_IPI_single(int dest_cpu, enum ipi_message_type op) | |
261 | { | |
262 | if (dest_cpu == NO_PROC_ID) { | |
263 | BUG(); | |
264 | return; | |
265 | } | |
266 | ||
267 | ipi_send(dest_cpu, op); | |
268 | } | |
269 | ||
270 | static inline void | |
271 | send_IPI_allbutself(enum ipi_message_type op) | |
272 | { | |
273 | int i; | |
274 | ||
394e3902 AM |
275 | for_each_online_cpu(i) { |
276 | if (i != smp_processor_id()) | |
1da177e4 LT |
277 | send_IPI_single(i, op); |
278 | } | |
279 | } | |
280 | ||
281 | ||
282 | inline void | |
283 | smp_send_stop(void) { send_IPI_allbutself(IPI_CPU_STOP); } | |
284 | ||
285 | static inline void | |
286 | smp_send_start(void) { send_IPI_allbutself(IPI_CPU_START); } | |
287 | ||
288 | void | |
289 | smp_send_reschedule(int cpu) { send_IPI_single(cpu, IPI_RESCHEDULE); } | |
290 | ||
d911aed8 JB |
291 | void |
292 | smp_send_all_nop(void) | |
293 | { | |
294 | send_IPI_allbutself(IPI_NOP); | |
295 | } | |
296 | ||
1da177e4 LT |
297 | |
298 | /** | |
299 | * Run a function on all other CPUs. | |
300 | * <func> The function to run. This must be fast and non-blocking. | |
301 | * <info> An arbitrary pointer to pass to the function. | |
302 | * <retry> If true, keep retrying until ready. | |
303 | * <wait> If true, wait until function has completed on other CPUs. | |
304 | * [RETURNS] 0 on success, else a negative status code. | |
305 | * | |
306 | * Does not return until remote CPUs are nearly ready to execute <func> | |
307 | * or have executed. | |
308 | */ | |
309 | ||
310 | int | |
311 | smp_call_function (void (*func) (void *info), void *info, int retry, int wait) | |
312 | { | |
313 | struct smp_call_struct data; | |
314 | unsigned long timeout; | |
315 | static DEFINE_SPINLOCK(lock); | |
316 | int retries = 0; | |
317 | ||
318 | if (num_online_cpus() < 2) | |
319 | return 0; | |
320 | ||
321 | /* Can deadlock when called with interrupts disabled */ | |
322 | WARN_ON(irqs_disabled()); | |
9a8b4584 JB |
323 | |
324 | /* can also deadlock if IPIs are disabled */ | |
325 | WARN_ON((get_eiem() & (1UL<<(CPU_IRQ_MAX - IPI_IRQ))) == 0); | |
326 | ||
1da177e4 LT |
327 | |
328 | data.func = func; | |
329 | data.info = info; | |
330 | data.wait = wait; | |
331 | atomic_set(&data.unstarted_count, num_online_cpus() - 1); | |
332 | atomic_set(&data.unfinished_count, num_online_cpus() - 1); | |
333 | ||
334 | if (retry) { | |
335 | spin_lock (&lock); | |
336 | while (smp_call_function_data != 0) | |
337 | barrier(); | |
338 | } | |
339 | else { | |
340 | spin_lock (&lock); | |
341 | if (smp_call_function_data) { | |
342 | spin_unlock (&lock); | |
343 | return -EBUSY; | |
344 | } | |
345 | } | |
346 | ||
347 | smp_call_function_data = &data; | |
348 | spin_unlock (&lock); | |
349 | ||
350 | /* Send a message to all other CPUs and wait for them to respond */ | |
351 | send_IPI_allbutself(IPI_CALL_FUNC); | |
352 | ||
353 | retry: | |
354 | /* Wait for response */ | |
355 | timeout = jiffies + HZ; | |
356 | while ( (atomic_read (&data.unstarted_count) > 0) && | |
357 | time_before (jiffies, timeout) ) | |
358 | barrier (); | |
359 | ||
360 | if (atomic_read (&data.unstarted_count) > 0) { | |
361 | printk(KERN_CRIT "SMP CALL FUNCTION TIMED OUT! (cpu=%d), try %d\n", | |
362 | smp_processor_id(), ++retries); | |
363 | goto retry; | |
364 | } | |
365 | /* We either got one or timed out. Release the lock */ | |
366 | ||
367 | mb(); | |
368 | smp_call_function_data = NULL; | |
369 | ||
370 | while (wait && atomic_read (&data.unfinished_count) > 0) | |
371 | barrier (); | |
372 | ||
373 | return 0; | |
374 | } | |
375 | ||
376 | EXPORT_SYMBOL(smp_call_function); | |
377 | ||
378 | /* | |
379 | * Flush all other CPU's tlb and then mine. Do this with on_each_cpu() | |
380 | * as we want to ensure all TLB's flushed before proceeding. | |
381 | */ | |
382 | ||
1da177e4 LT |
383 | void |
384 | smp_flush_tlb_all(void) | |
385 | { | |
1b2425e3 | 386 | on_each_cpu(flush_tlb_all_local, NULL, 1, 1); |
1da177e4 LT |
387 | } |
388 | ||
1da177e4 LT |
389 | /* |
390 | * Called by secondaries to update state and initialize CPU registers. | |
391 | */ | |
392 | static void __init | |
393 | smp_cpu_init(int cpunum) | |
394 | { | |
56f335c8 | 395 | extern int init_per_cpu(int); /* arch/parisc/kernel/processor.c */ |
1da177e4 | 396 | extern void init_IRQ(void); /* arch/parisc/kernel/irq.c */ |
56f335c8 | 397 | extern void start_cpu_itimer(void); /* arch/parisc/kernel/time.c */ |
1da177e4 LT |
398 | |
399 | /* Set modes and Enable floating point coprocessor */ | |
400 | (void) init_per_cpu(cpunum); | |
401 | ||
402 | disable_sr_hashing(); | |
403 | ||
404 | mb(); | |
405 | ||
406 | /* Well, support 2.4 linux scheme as well. */ | |
407 | if (cpu_test_and_set(cpunum, cpu_online_map)) | |
408 | { | |
409 | extern void machine_halt(void); /* arch/parisc.../process.c */ | |
410 | ||
411 | printk(KERN_CRIT "CPU#%d already initialized!\n", cpunum); | |
412 | machine_halt(); | |
413 | } | |
414 | ||
415 | /* Initialise the idle task for this CPU */ | |
416 | atomic_inc(&init_mm.mm_count); | |
417 | current->active_mm = &init_mm; | |
418 | if(current->mm) | |
419 | BUG(); | |
420 | enter_lazy_tlb(&init_mm, current); | |
421 | ||
7022672e | 422 | init_IRQ(); /* make sure no IRQs are enabled or pending */ |
56f335c8 | 423 | start_cpu_itimer(); |
1da177e4 LT |
424 | } |
425 | ||
426 | ||
427 | /* | |
428 | * Slaves start using C here. Indirectly called from smp_slave_stext. | |
429 | * Do what start_kernel() and main() do for boot strap processor (aka monarch) | |
430 | */ | |
431 | void __init smp_callin(void) | |
432 | { | |
433 | int slave_id = cpu_now_booting; | |
434 | #if 0 | |
435 | void *istack; | |
436 | #endif | |
437 | ||
438 | smp_cpu_init(slave_id); | |
5bfb5d69 | 439 | preempt_disable(); |
1da177e4 LT |
440 | |
441 | #if 0 /* NOT WORKING YET - see entry.S */ | |
442 | istack = (void *)__get_free_pages(GFP_KERNEL,ISTACK_ORDER); | |
443 | if (istack == NULL) { | |
444 | printk(KERN_CRIT "Failed to allocate interrupt stack for cpu %d\n",slave_id); | |
445 | BUG(); | |
446 | } | |
447 | mtctl(istack,31); | |
448 | #endif | |
449 | ||
450 | flush_cache_all_local(); /* start with known state */ | |
1b2425e3 | 451 | flush_tlb_all_local(NULL); |
1da177e4 LT |
452 | |
453 | local_irq_enable(); /* Interrupts have been off until now */ | |
454 | ||
455 | cpu_idle(); /* Wait for timer to schedule some work */ | |
456 | ||
457 | /* NOTREACHED */ | |
458 | panic("smp_callin() AAAAaaaaahhhh....\n"); | |
459 | } | |
460 | ||
461 | /* | |
462 | * Bring one cpu online. | |
463 | */ | |
8dff980f | 464 | int __cpuinit smp_boot_one_cpu(int cpuid) |
1da177e4 LT |
465 | { |
466 | struct task_struct *idle; | |
467 | long timeout; | |
468 | ||
469 | /* | |
470 | * Create an idle task for this CPU. Note the address wed* give | |
471 | * to kernel_thread is irrelevant -- it's going to start | |
472 | * where OS_BOOT_RENDEVZ vector in SAL says to start. But | |
473 | * this gets all the other task-y sort of data structures set | |
474 | * up like we wish. We need to pull the just created idle task | |
475 | * off the run queue and stuff it into the init_tasks[] array. | |
476 | * Sheesh . . . | |
477 | */ | |
478 | ||
479 | idle = fork_idle(cpuid); | |
480 | if (IS_ERR(idle)) | |
481 | panic("SMP: fork failed for CPU:%d", cpuid); | |
482 | ||
40f1f0de | 483 | task_thread_info(idle)->cpu = cpuid; |
1da177e4 LT |
484 | |
485 | /* Let _start know what logical CPU we're booting | |
486 | ** (offset into init_tasks[],cpu_data[]) | |
487 | */ | |
488 | cpu_now_booting = cpuid; | |
489 | ||
490 | /* | |
491 | ** boot strap code needs to know the task address since | |
492 | ** it also contains the process stack. | |
493 | */ | |
494 | smp_init_current_idle_task = idle ; | |
495 | mb(); | |
496 | ||
497 | printk("Releasing cpu %d now, hpa=%lx\n", cpuid, cpu_data[cpuid].hpa); | |
498 | ||
499 | /* | |
500 | ** This gets PDC to release the CPU from a very tight loop. | |
501 | ** | |
502 | ** From the PA-RISC 2.0 Firmware Architecture Reference Specification: | |
503 | ** "The MEM_RENDEZ vector specifies the location of OS_RENDEZ which | |
504 | ** is executed after receiving the rendezvous signal (an interrupt to | |
505 | ** EIR{0}). MEM_RENDEZ is valid only when it is nonzero and the | |
506 | ** contents of memory are valid." | |
507 | */ | |
508 | gsc_writel(TIMER_IRQ - CPU_IRQ_BASE, cpu_data[cpuid].hpa); | |
509 | mb(); | |
510 | ||
511 | /* | |
512 | * OK, wait a bit for that CPU to finish staggering about. | |
513 | * Slave will set a bit when it reaches smp_cpu_init(). | |
514 | * Once the "monarch CPU" sees the bit change, it can move on. | |
515 | */ | |
516 | for (timeout = 0; timeout < 10000; timeout++) { | |
517 | if(cpu_online(cpuid)) { | |
518 | /* Which implies Slave has started up */ | |
519 | cpu_now_booting = 0; | |
520 | smp_init_current_idle_task = NULL; | |
521 | goto alive ; | |
522 | } | |
523 | udelay(100); | |
524 | barrier(); | |
525 | } | |
526 | ||
527 | put_task_struct(idle); | |
528 | idle = NULL; | |
529 | ||
530 | printk(KERN_CRIT "SMP: CPU:%d is stuck.\n", cpuid); | |
531 | return -1; | |
532 | ||
533 | alive: | |
534 | /* Remember the Slave data */ | |
5492a0f0 | 535 | smp_debug(100, KERN_DEBUG "SMP: CPU:%d came alive after %ld _us\n", |
1da177e4 | 536 | cpuid, timeout * 100); |
1da177e4 LT |
537 | return 0; |
538 | } | |
539 | ||
540 | void __devinit smp_prepare_boot_cpu(void) | |
541 | { | |
542 | int bootstrap_processor=cpu_data[0].cpuid; /* CPU ID of BSP */ | |
543 | ||
1da177e4 LT |
544 | /* Setup BSP mappings */ |
545 | printk("SMP: bootstrap CPU ID is %d\n",bootstrap_processor); | |
546 | ||
547 | cpu_set(bootstrap_processor, cpu_online_map); | |
548 | cpu_set(bootstrap_processor, cpu_present_map); | |
549 | } | |
550 | ||
551 | ||
552 | ||
553 | /* | |
554 | ** inventory.c:do_inventory() hasn't yet been run and thus we | |
7022672e | 555 | ** don't 'discover' the additional CPUs until later. |
1da177e4 LT |
556 | */ |
557 | void __init smp_prepare_cpus(unsigned int max_cpus) | |
558 | { | |
559 | cpus_clear(cpu_present_map); | |
560 | cpu_set(0, cpu_present_map); | |
561 | ||
562 | parisc_max_cpus = max_cpus; | |
563 | if (!max_cpus) | |
564 | printk(KERN_INFO "SMP mode deactivated.\n"); | |
565 | } | |
566 | ||
567 | ||
568 | void smp_cpus_done(unsigned int cpu_max) | |
569 | { | |
570 | return; | |
571 | } | |
572 | ||
573 | ||
b282b6f8 | 574 | int __cpuinit __cpu_up(unsigned int cpu) |
1da177e4 LT |
575 | { |
576 | if (cpu != 0 && cpu < parisc_max_cpus) | |
577 | smp_boot_one_cpu(cpu); | |
578 | ||
579 | return cpu_online(cpu) ? 0 : -ENOSYS; | |
580 | } | |
581 | ||
1da177e4 LT |
582 | #ifdef CONFIG_PROC_FS |
583 | int __init | |
584 | setup_profiling_timer(unsigned int multiplier) | |
585 | { | |
586 | return -EINVAL; | |
587 | } | |
588 | #endif |