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> | |
4e950f6f | 31 | #include <linux/err.h> |
1da177e4 LT |
32 | #include <linux/delay.h> |
33 | #include <linux/bitops.h> | |
34 | ||
35 | #include <asm/system.h> | |
36 | #include <asm/atomic.h> | |
37 | #include <asm/current.h> | |
38 | #include <asm/delay.h> | |
1b2425e3 | 39 | #include <asm/tlbflush.h> |
1da177e4 LT |
40 | |
41 | #include <asm/io.h> | |
42 | #include <asm/irq.h> /* for CPU_IRQ_REGION and friends */ | |
43 | #include <asm/mmu_context.h> | |
44 | #include <asm/page.h> | |
45 | #include <asm/pgtable.h> | |
46 | #include <asm/pgalloc.h> | |
47 | #include <asm/processor.h> | |
48 | #include <asm/ptrace.h> | |
49 | #include <asm/unistd.h> | |
50 | #include <asm/cacheflush.h> | |
51 | ||
5492a0f0 KM |
52 | #undef DEBUG_SMP |
53 | #ifdef DEBUG_SMP | |
54 | static int smp_debug_lvl = 0; | |
55 | #define smp_debug(lvl, printargs...) \ | |
56 | if (lvl >= smp_debug_lvl) \ | |
57 | printk(printargs); | |
58 | #else | |
59 | #define smp_debug(lvl, ...) | |
60 | #endif /* DEBUG_SMP */ | |
1da177e4 LT |
61 | |
62 | DEFINE_SPINLOCK(smp_lock); | |
63 | ||
64 | volatile struct task_struct *smp_init_current_idle_task; | |
65 | ||
8039de10 | 66 | static volatile int cpu_now_booting __read_mostly = 0; /* track which CPU is booting */ |
1da177e4 | 67 | |
8039de10 | 68 | static int parisc_max_cpus __read_mostly = 1; |
1da177e4 LT |
69 | |
70 | /* online cpus are ones that we've managed to bring up completely | |
71 | * possible cpus are all valid cpu | |
72 | * present cpus are all detected cpu | |
73 | * | |
74 | * On startup we bring up the "possible" cpus. Since we discover | |
75 | * CPUs later, we add them as hotplug, so the possible cpu mask is | |
76 | * empty in the beginning. | |
77 | */ | |
78 | ||
8039de10 HD |
79 | cpumask_t cpu_online_map __read_mostly = CPU_MASK_NONE; /* Bitmap of online CPUs */ |
80 | cpumask_t cpu_possible_map __read_mostly = CPU_MASK_ALL; /* Bitmap of Present CPUs */ | |
1da177e4 LT |
81 | |
82 | EXPORT_SYMBOL(cpu_online_map); | |
83 | EXPORT_SYMBOL(cpu_possible_map); | |
84 | ||
3c97b5e9 | 85 | DEFINE_PER_CPU(spinlock_t, ipi_lock) = SPIN_LOCK_UNLOCKED; |
1da177e4 LT |
86 | |
87 | struct smp_call_struct { | |
88 | void (*func) (void *info); | |
89 | void *info; | |
90 | long wait; | |
91 | atomic_t unstarted_count; | |
92 | atomic_t unfinished_count; | |
93 | }; | |
94 | static volatile struct smp_call_struct *smp_call_function_data; | |
95 | ||
96 | enum ipi_message_type { | |
97 | IPI_NOP=0, | |
98 | IPI_RESCHEDULE=1, | |
99 | IPI_CALL_FUNC, | |
100 | IPI_CPU_START, | |
101 | IPI_CPU_STOP, | |
102 | IPI_CPU_TEST | |
103 | }; | |
104 | ||
105 | ||
106 | /********** SMP inter processor interrupt and communication routines */ | |
107 | ||
108 | #undef PER_CPU_IRQ_REGION | |
109 | #ifdef PER_CPU_IRQ_REGION | |
110 | /* XXX REVISIT Ignore for now. | |
111 | ** *May* need this "hook" to register IPI handler | |
112 | ** once we have perCPU ExtIntr switch tables. | |
113 | */ | |
114 | static void | |
115 | ipi_init(int cpuid) | |
116 | { | |
1da177e4 LT |
117 | #error verify IRQ_OFFSET(IPI_IRQ) is ipi_interrupt() in new IRQ region |
118 | ||
119 | if(cpu_online(cpuid) ) | |
120 | { | |
121 | switch_to_idle_task(current); | |
122 | } | |
123 | ||
124 | return; | |
125 | } | |
126 | #endif | |
127 | ||
128 | ||
129 | /* | |
130 | ** Yoink this CPU from the runnable list... | |
131 | ** | |
132 | */ | |
133 | static void | |
134 | halt_processor(void) | |
135 | { | |
1da177e4 LT |
136 | /* REVISIT : redirect I/O Interrupts to another CPU? */ |
137 | /* REVISIT : does PM *know* this CPU isn't available? */ | |
138 | cpu_clear(smp_processor_id(), cpu_online_map); | |
139 | local_irq_disable(); | |
140 | for (;;) | |
141 | ; | |
1da177e4 LT |
142 | } |
143 | ||
144 | ||
145 | irqreturn_t | |
c7753f18 | 146 | ipi_interrupt(int irq, void *dev_id) |
1da177e4 LT |
147 | { |
148 | int this_cpu = smp_processor_id(); | |
149 | struct cpuinfo_parisc *p = &cpu_data[this_cpu]; | |
150 | unsigned long ops; | |
151 | unsigned long flags; | |
152 | ||
153 | /* Count this now; we may make a call that never returns. */ | |
154 | p->ipi_count++; | |
155 | ||
156 | mb(); /* Order interrupt and bit testing. */ | |
157 | ||
158 | for (;;) { | |
3c97b5e9 KM |
159 | spinlock_t *lock = &per_cpu(ipi_lock, this_cpu); |
160 | spin_lock_irqsave(lock, flags); | |
1da177e4 LT |
161 | ops = p->pending_ipi; |
162 | p->pending_ipi = 0; | |
3c97b5e9 | 163 | spin_unlock_irqrestore(lock, flags); |
1da177e4 LT |
164 | |
165 | mb(); /* Order bit clearing and data access. */ | |
166 | ||
167 | if (!ops) | |
168 | break; | |
169 | ||
170 | while (ops) { | |
171 | unsigned long which = ffz(~ops); | |
172 | ||
d911aed8 JB |
173 | ops &= ~(1 << which); |
174 | ||
1da177e4 | 175 | switch (which) { |
d911aed8 | 176 | case IPI_NOP: |
5492a0f0 | 177 | smp_debug(100, KERN_DEBUG "CPU%d IPI_NOP\n", this_cpu); |
d911aed8 JB |
178 | break; |
179 | ||
1da177e4 | 180 | case IPI_RESCHEDULE: |
5492a0f0 | 181 | smp_debug(100, KERN_DEBUG "CPU%d IPI_RESCHEDULE\n", this_cpu); |
1da177e4 LT |
182 | /* |
183 | * Reschedule callback. Everything to be | |
184 | * done is done by the interrupt return path. | |
185 | */ | |
186 | break; | |
187 | ||
188 | case IPI_CALL_FUNC: | |
5492a0f0 | 189 | smp_debug(100, KERN_DEBUG "CPU%d IPI_CALL_FUNC\n", this_cpu); |
1da177e4 LT |
190 | { |
191 | volatile struct smp_call_struct *data; | |
192 | void (*func)(void *info); | |
193 | void *info; | |
194 | int wait; | |
195 | ||
196 | data = smp_call_function_data; | |
197 | func = data->func; | |
198 | info = data->info; | |
199 | wait = data->wait; | |
200 | ||
201 | mb(); | |
202 | atomic_dec ((atomic_t *)&data->unstarted_count); | |
203 | ||
204 | /* At this point, *data can't | |
205 | * be relied upon. | |
206 | */ | |
207 | ||
208 | (*func)(info); | |
209 | ||
210 | /* Notify the sending CPU that the | |
211 | * task is done. | |
212 | */ | |
213 | mb(); | |
214 | if (wait) | |
215 | atomic_dec ((atomic_t *)&data->unfinished_count); | |
216 | } | |
217 | break; | |
218 | ||
219 | case IPI_CPU_START: | |
5492a0f0 | 220 | smp_debug(100, KERN_DEBUG "CPU%d IPI_CPU_START\n", this_cpu); |
1da177e4 LT |
221 | break; |
222 | ||
223 | case IPI_CPU_STOP: | |
5492a0f0 | 224 | smp_debug(100, KERN_DEBUG "CPU%d IPI_CPU_STOP\n", this_cpu); |
1da177e4 | 225 | halt_processor(); |
1da177e4 LT |
226 | break; |
227 | ||
228 | case IPI_CPU_TEST: | |
5492a0f0 | 229 | smp_debug(100, KERN_DEBUG "CPU%d is alive!\n", this_cpu); |
1da177e4 LT |
230 | break; |
231 | ||
232 | default: | |
233 | printk(KERN_CRIT "Unknown IPI num on CPU%d: %lu\n", | |
234 | this_cpu, which); | |
1da177e4 LT |
235 | return IRQ_NONE; |
236 | } /* Switch */ | |
7085689e JB |
237 | /* let in any pending interrupts */ |
238 | local_irq_enable(); | |
239 | local_irq_disable(); | |
1da177e4 LT |
240 | } /* while (ops) */ |
241 | } | |
242 | return IRQ_HANDLED; | |
243 | } | |
244 | ||
245 | ||
246 | static inline void | |
247 | ipi_send(int cpu, enum ipi_message_type op) | |
248 | { | |
249 | struct cpuinfo_parisc *p = &cpu_data[cpu]; | |
3c97b5e9 | 250 | spinlock_t *lock = &per_cpu(ipi_lock, cpu); |
1da177e4 LT |
251 | unsigned long flags; |
252 | ||
3c97b5e9 | 253 | spin_lock_irqsave(lock, flags); |
1da177e4 LT |
254 | p->pending_ipi |= 1 << op; |
255 | gsc_writel(IPI_IRQ - CPU_IRQ_BASE, cpu_data[cpu].hpa); | |
3c97b5e9 | 256 | spin_unlock_irqrestore(lock, flags); |
1da177e4 LT |
257 | } |
258 | ||
259 | ||
260 | static inline void | |
261 | send_IPI_single(int dest_cpu, enum ipi_message_type op) | |
262 | { | |
263 | if (dest_cpu == NO_PROC_ID) { | |
264 | BUG(); | |
265 | return; | |
266 | } | |
267 | ||
268 | ipi_send(dest_cpu, op); | |
269 | } | |
270 | ||
271 | static inline void | |
272 | send_IPI_allbutself(enum ipi_message_type op) | |
273 | { | |
274 | int i; | |
275 | ||
394e3902 AM |
276 | for_each_online_cpu(i) { |
277 | if (i != smp_processor_id()) | |
1da177e4 LT |
278 | send_IPI_single(i, op); |
279 | } | |
280 | } | |
281 | ||
282 | ||
283 | inline void | |
284 | smp_send_stop(void) { send_IPI_allbutself(IPI_CPU_STOP); } | |
285 | ||
286 | static inline void | |
287 | smp_send_start(void) { send_IPI_allbutself(IPI_CPU_START); } | |
288 | ||
289 | void | |
290 | smp_send_reschedule(int cpu) { send_IPI_single(cpu, IPI_RESCHEDULE); } | |
291 | ||
d911aed8 JB |
292 | void |
293 | smp_send_all_nop(void) | |
294 | { | |
295 | send_IPI_allbutself(IPI_NOP); | |
296 | } | |
297 | ||
1da177e4 LT |
298 | |
299 | /** | |
300 | * Run a function on all other CPUs. | |
301 | * <func> The function to run. This must be fast and non-blocking. | |
302 | * <info> An arbitrary pointer to pass to the function. | |
303 | * <retry> If true, keep retrying until ready. | |
304 | * <wait> If true, wait until function has completed on other CPUs. | |
305 | * [RETURNS] 0 on success, else a negative status code. | |
306 | * | |
307 | * Does not return until remote CPUs are nearly ready to execute <func> | |
308 | * or have executed. | |
309 | */ | |
310 | ||
311 | int | |
312 | smp_call_function (void (*func) (void *info), void *info, int retry, int wait) | |
313 | { | |
314 | struct smp_call_struct data; | |
315 | unsigned long timeout; | |
316 | static DEFINE_SPINLOCK(lock); | |
317 | int retries = 0; | |
318 | ||
319 | if (num_online_cpus() < 2) | |
320 | return 0; | |
321 | ||
322 | /* Can deadlock when called with interrupts disabled */ | |
323 | WARN_ON(irqs_disabled()); | |
9a8b4584 JB |
324 | |
325 | /* can also deadlock if IPIs are disabled */ | |
326 | WARN_ON((get_eiem() & (1UL<<(CPU_IRQ_MAX - IPI_IRQ))) == 0); | |
327 | ||
1da177e4 LT |
328 | |
329 | data.func = func; | |
330 | data.info = info; | |
331 | data.wait = wait; | |
332 | atomic_set(&data.unstarted_count, num_online_cpus() - 1); | |
333 | atomic_set(&data.unfinished_count, num_online_cpus() - 1); | |
334 | ||
335 | if (retry) { | |
336 | spin_lock (&lock); | |
337 | while (smp_call_function_data != 0) | |
338 | barrier(); | |
339 | } | |
340 | else { | |
341 | spin_lock (&lock); | |
342 | if (smp_call_function_data) { | |
343 | spin_unlock (&lock); | |
344 | return -EBUSY; | |
345 | } | |
346 | } | |
347 | ||
348 | smp_call_function_data = &data; | |
349 | spin_unlock (&lock); | |
350 | ||
351 | /* Send a message to all other CPUs and wait for them to respond */ | |
352 | send_IPI_allbutself(IPI_CALL_FUNC); | |
353 | ||
354 | retry: | |
355 | /* Wait for response */ | |
356 | timeout = jiffies + HZ; | |
357 | while ( (atomic_read (&data.unstarted_count) > 0) && | |
358 | time_before (jiffies, timeout) ) | |
359 | barrier (); | |
360 | ||
361 | if (atomic_read (&data.unstarted_count) > 0) { | |
362 | printk(KERN_CRIT "SMP CALL FUNCTION TIMED OUT! (cpu=%d), try %d\n", | |
363 | smp_processor_id(), ++retries); | |
364 | goto retry; | |
365 | } | |
366 | /* We either got one or timed out. Release the lock */ | |
367 | ||
368 | mb(); | |
369 | smp_call_function_data = NULL; | |
370 | ||
371 | while (wait && atomic_read (&data.unfinished_count) > 0) | |
372 | barrier (); | |
373 | ||
374 | return 0; | |
375 | } | |
376 | ||
377 | EXPORT_SYMBOL(smp_call_function); | |
378 | ||
379 | /* | |
380 | * Flush all other CPU's tlb and then mine. Do this with on_each_cpu() | |
381 | * as we want to ensure all TLB's flushed before proceeding. | |
382 | */ | |
383 | ||
1da177e4 LT |
384 | void |
385 | smp_flush_tlb_all(void) | |
386 | { | |
1b2425e3 | 387 | on_each_cpu(flush_tlb_all_local, NULL, 1, 1); |
1da177e4 LT |
388 | } |
389 | ||
1da177e4 LT |
390 | /* |
391 | * Called by secondaries to update state and initialize CPU registers. | |
392 | */ | |
393 | static void __init | |
394 | smp_cpu_init(int cpunum) | |
395 | { | |
56f335c8 | 396 | extern int init_per_cpu(int); /* arch/parisc/kernel/processor.c */ |
1da177e4 | 397 | extern void init_IRQ(void); /* arch/parisc/kernel/irq.c */ |
56f335c8 | 398 | extern void start_cpu_itimer(void); /* arch/parisc/kernel/time.c */ |
1da177e4 LT |
399 | |
400 | /* Set modes and Enable floating point coprocessor */ | |
401 | (void) init_per_cpu(cpunum); | |
402 | ||
403 | disable_sr_hashing(); | |
404 | ||
405 | mb(); | |
406 | ||
407 | /* Well, support 2.4 linux scheme as well. */ | |
408 | if (cpu_test_and_set(cpunum, cpu_online_map)) | |
409 | { | |
410 | extern void machine_halt(void); /* arch/parisc.../process.c */ | |
411 | ||
412 | printk(KERN_CRIT "CPU#%d already initialized!\n", cpunum); | |
413 | machine_halt(); | |
414 | } | |
415 | ||
416 | /* Initialise the idle task for this CPU */ | |
417 | atomic_inc(&init_mm.mm_count); | |
418 | current->active_mm = &init_mm; | |
419 | if(current->mm) | |
420 | BUG(); | |
421 | enter_lazy_tlb(&init_mm, current); | |
422 | ||
7022672e | 423 | init_IRQ(); /* make sure no IRQs are enabled or pending */ |
56f335c8 | 424 | start_cpu_itimer(); |
1da177e4 LT |
425 | } |
426 | ||
427 | ||
428 | /* | |
429 | * Slaves start using C here. Indirectly called from smp_slave_stext. | |
430 | * Do what start_kernel() and main() do for boot strap processor (aka monarch) | |
431 | */ | |
432 | void __init smp_callin(void) | |
433 | { | |
434 | int slave_id = cpu_now_booting; | |
1da177e4 LT |
435 | |
436 | smp_cpu_init(slave_id); | |
5bfb5d69 | 437 | preempt_disable(); |
1da177e4 | 438 | |
1da177e4 | 439 | flush_cache_all_local(); /* start with known state */ |
1b2425e3 | 440 | flush_tlb_all_local(NULL); |
1da177e4 LT |
441 | |
442 | local_irq_enable(); /* Interrupts have been off until now */ | |
443 | ||
444 | cpu_idle(); /* Wait for timer to schedule some work */ | |
445 | ||
446 | /* NOTREACHED */ | |
447 | panic("smp_callin() AAAAaaaaahhhh....\n"); | |
448 | } | |
449 | ||
450 | /* | |
451 | * Bring one cpu online. | |
452 | */ | |
8dff980f | 453 | int __cpuinit smp_boot_one_cpu(int cpuid) |
1da177e4 LT |
454 | { |
455 | struct task_struct *idle; | |
456 | long timeout; | |
457 | ||
458 | /* | |
459 | * Create an idle task for this CPU. Note the address wed* give | |
460 | * to kernel_thread is irrelevant -- it's going to start | |
461 | * where OS_BOOT_RENDEVZ vector in SAL says to start. But | |
462 | * this gets all the other task-y sort of data structures set | |
463 | * up like we wish. We need to pull the just created idle task | |
464 | * off the run queue and stuff it into the init_tasks[] array. | |
465 | * Sheesh . . . | |
466 | */ | |
467 | ||
468 | idle = fork_idle(cpuid); | |
469 | if (IS_ERR(idle)) | |
470 | panic("SMP: fork failed for CPU:%d", cpuid); | |
471 | ||
40f1f0de | 472 | task_thread_info(idle)->cpu = cpuid; |
1da177e4 LT |
473 | |
474 | /* Let _start know what logical CPU we're booting | |
475 | ** (offset into init_tasks[],cpu_data[]) | |
476 | */ | |
477 | cpu_now_booting = cpuid; | |
478 | ||
479 | /* | |
480 | ** boot strap code needs to know the task address since | |
481 | ** it also contains the process stack. | |
482 | */ | |
483 | smp_init_current_idle_task = idle ; | |
484 | mb(); | |
485 | ||
486 | printk("Releasing cpu %d now, hpa=%lx\n", cpuid, cpu_data[cpuid].hpa); | |
487 | ||
488 | /* | |
489 | ** This gets PDC to release the CPU from a very tight loop. | |
490 | ** | |
491 | ** From the PA-RISC 2.0 Firmware Architecture Reference Specification: | |
492 | ** "The MEM_RENDEZ vector specifies the location of OS_RENDEZ which | |
493 | ** is executed after receiving the rendezvous signal (an interrupt to | |
494 | ** EIR{0}). MEM_RENDEZ is valid only when it is nonzero and the | |
495 | ** contents of memory are valid." | |
496 | */ | |
497 | gsc_writel(TIMER_IRQ - CPU_IRQ_BASE, cpu_data[cpuid].hpa); | |
498 | mb(); | |
499 | ||
500 | /* | |
501 | * OK, wait a bit for that CPU to finish staggering about. | |
502 | * Slave will set a bit when it reaches smp_cpu_init(). | |
503 | * Once the "monarch CPU" sees the bit change, it can move on. | |
504 | */ | |
505 | for (timeout = 0; timeout < 10000; timeout++) { | |
506 | if(cpu_online(cpuid)) { | |
507 | /* Which implies Slave has started up */ | |
508 | cpu_now_booting = 0; | |
509 | smp_init_current_idle_task = NULL; | |
510 | goto alive ; | |
511 | } | |
512 | udelay(100); | |
513 | barrier(); | |
514 | } | |
515 | ||
516 | put_task_struct(idle); | |
517 | idle = NULL; | |
518 | ||
519 | printk(KERN_CRIT "SMP: CPU:%d is stuck.\n", cpuid); | |
520 | return -1; | |
521 | ||
522 | alive: | |
523 | /* Remember the Slave data */ | |
5492a0f0 | 524 | smp_debug(100, KERN_DEBUG "SMP: CPU:%d came alive after %ld _us\n", |
1da177e4 | 525 | cpuid, timeout * 100); |
1da177e4 LT |
526 | return 0; |
527 | } | |
528 | ||
529 | void __devinit smp_prepare_boot_cpu(void) | |
530 | { | |
531 | int bootstrap_processor=cpu_data[0].cpuid; /* CPU ID of BSP */ | |
532 | ||
1da177e4 LT |
533 | /* Setup BSP mappings */ |
534 | printk("SMP: bootstrap CPU ID is %d\n",bootstrap_processor); | |
535 | ||
536 | cpu_set(bootstrap_processor, cpu_online_map); | |
537 | cpu_set(bootstrap_processor, cpu_present_map); | |
538 | } | |
539 | ||
540 | ||
541 | ||
542 | /* | |
543 | ** inventory.c:do_inventory() hasn't yet been run and thus we | |
7022672e | 544 | ** don't 'discover' the additional CPUs until later. |
1da177e4 LT |
545 | */ |
546 | void __init smp_prepare_cpus(unsigned int max_cpus) | |
547 | { | |
548 | cpus_clear(cpu_present_map); | |
549 | cpu_set(0, cpu_present_map); | |
550 | ||
551 | parisc_max_cpus = max_cpus; | |
552 | if (!max_cpus) | |
553 | printk(KERN_INFO "SMP mode deactivated.\n"); | |
554 | } | |
555 | ||
556 | ||
557 | void smp_cpus_done(unsigned int cpu_max) | |
558 | { | |
559 | return; | |
560 | } | |
561 | ||
562 | ||
b282b6f8 | 563 | int __cpuinit __cpu_up(unsigned int cpu) |
1da177e4 LT |
564 | { |
565 | if (cpu != 0 && cpu < parisc_max_cpus) | |
566 | smp_boot_one_cpu(cpu); | |
567 | ||
568 | return cpu_online(cpu) ? 0 : -ENOSYS; | |
569 | } | |
570 | ||
1da177e4 LT |
571 | #ifdef CONFIG_PROC_FS |
572 | int __init | |
573 | setup_profiling_timer(unsigned int multiplier) | |
574 | { | |
575 | return -EINVAL; | |
576 | } | |
577 | #endif |