err.no Git - linux-2.6/blob - arch/parisc/kernel/smp.c

   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 **
  11 ** Thanks to John Curry and Ullas Ponnadi. I learned alot from their work.
  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 */
  19 #undef ENTRY_SYS_CPUS   /* syscall support for iCOD-like functionality */
  20
  21 #include <linux/config.h>
  22
  23 #include <linux/types.h>
  24 #include <linux/spinlock.h>
  25 #include <linux/slab.h>
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/sched.h>
  30 #include <linux/init.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/smp.h>
  33 #include <linux/kernel_stat.h>
  34 #include <linux/mm.h>
  35 #include <linux/delay.h>
  36 #include <linux/bitops.h>
  37
  38 #include <asm/system.h>
  39 #include <asm/atomic.h>
  40 #include <asm/current.h>
  41 #include <asm/delay.h>
  42 #include <asm/pgalloc.h>        /* for flush_tlb_all() proto/macro */
  43
  44 #include <asm/io.h>
  45 #include <asm/irq.h>            /* for CPU_IRQ_REGION and friends */
  46 #include <asm/mmu_context.h>
  47 #include <asm/page.h>
  48 #include <asm/pgtable.h>
  49 #include <asm/pgalloc.h>
  50 #include <asm/processor.h>
  51 #include <asm/ptrace.h>
  52 #include <asm/unistd.h>
  53 #include <asm/cacheflush.h>
  54
  55 #define kDEBUG 0
  56
  57 DEFINE_SPINLOCK(smp_lock);
  58
  59 volatile struct task_struct *smp_init_current_idle_task;
  60
  61 static volatile int cpu_now_booting = 0;        /* track which CPU is booting */
  62
  63 static int parisc_max_cpus = 1;
  64
  65 /* online cpus are ones that we've managed to bring up completely
  66  * possible cpus are all valid cpu
  67  * present cpus are all detected cpu
  68  *
  69  * On startup we bring up the "possible" cpus. Since we discover
  70  * CPUs later, we add them as hotplug, so the possible cpu mask is
  71  * empty in the beginning.
  72  */
  73
  74 cpumask_t cpu_online_map = CPU_MASK_NONE;       /* Bitmap of online CPUs */
  75 cpumask_t cpu_possible_map = CPU_MASK_ALL;      /* Bitmap of Present CPUs */
  76
  77 EXPORT_SYMBOL(cpu_online_map);
  78 EXPORT_SYMBOL(cpu_possible_map);
  79
  80
  81 struct smp_call_struct {
  82         void (*func) (void *info);
  83         void *info;
  84         long wait;
  85         atomic_t unstarted_count;
  86         atomic_t unfinished_count;
  87 };
  88 static volatile struct smp_call_struct *smp_call_function_data;
  89
  90 enum ipi_message_type {
  91         IPI_NOP=0,
  92         IPI_RESCHEDULE=1,
  93         IPI_CALL_FUNC,
  94         IPI_CPU_START,
  95         IPI_CPU_STOP,
  96         IPI_CPU_TEST
  97 };
  98
  99
 100 /********** SMP inter processor interrupt and communication routines */
 101
 102 #undef PER_CPU_IRQ_REGION
 103 #ifdef PER_CPU_IRQ_REGION
 104 /* XXX REVISIT Ignore for now.
 105 **    *May* need this "hook" to register IPI handler
 106 **    once we have perCPU ExtIntr switch tables.
 107 */
 108 static void
 109 ipi_init(int cpuid)
 110 {
 111
 112         /* If CPU is present ... */
 113 #ifdef ENTRY_SYS_CPUS
 114         /* *and* running (not stopped) ... */
 115 #error iCOD support wants state checked here.
 116 #endif
 117
 118 #error verify IRQ_OFFSET(IPI_IRQ) is ipi_interrupt() in new IRQ region
 119
 120         if(cpu_online(cpuid) )
 121         {
 122                 switch_to_idle_task(current);
 123         }
 124
 125         return;
 126 }
 127 #endif
 128
 129
 130 /*
 131 ** Yoink this CPU from the runnable list...
 132 **
 133 */
 134 static void
 135 halt_processor(void)
 136 {
 137 #ifdef ENTRY_SYS_CPUS
 138 #error halt_processor() needs rework
 139 /*
 140 ** o migrate I/O interrupts off this CPU.
 141 ** o leave IPI enabled - __cli() will disable IPI.
 142 ** o leave CPU in online map - just change the state
 143 */
 144         cpu_data[this_cpu].state = STATE_STOPPED;
 145         mark_bh(IPI_BH);
 146 #else
 147         /* REVISIT : redirect I/O Interrupts to another CPU? */
 148         /* REVISIT : does PM *know* this CPU isn't available? */
 149         cpu_clear(smp_processor_id(), cpu_online_map);
 150         local_irq_disable();
 151         for (;;)
 152                 ;
 153 #endif
 154 }
 155
 156
 157 irqreturn_t
 158 ipi_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 159 {
 160         int this_cpu = smp_processor_id();
 161         struct cpuinfo_parisc *p = &cpu_data[this_cpu];
 162         unsigned long ops;
 163         unsigned long flags;
 164
 165         /* Count this now; we may make a call that never returns. */
 166         p->ipi_count++;
 167
 168         mb();   /* Order interrupt and bit testing. */
 169
 170         for (;;) {
 171                 spin_lock_irqsave(&(p->lock),flags);
 172                 ops = p->pending_ipi;
 173                 p->pending_ipi = 0;
 174                 spin_unlock_irqrestore(&(p->lock),flags);
 175
 176                 mb(); /* Order bit clearing and data access. */
 177
 178                 if (!ops)
 179                     break;
 180
 181                 while (ops) {
 182                         unsigned long which = ffz(~ops);
 183
 184                         switch (which) {
 185                         case IPI_RESCHEDULE:
 186 #if (kDEBUG>=100)
 187                                 printk(KERN_DEBUG "CPU%d IPI_RESCHEDULE\n",this_cpu);
 188 #endif /* kDEBUG */
 189                                 ops &= ~(1 << IPI_RESCHEDULE);
 190                                 /*
 191                                  * Reschedule callback.  Everything to be
 192                                  * done is done by the interrupt return path.
 193                                  */
 194                                 break;
 195
 196                         case IPI_CALL_FUNC:
 197 #if (kDEBUG>=100)
 198                                 printk(KERN_DEBUG "CPU%d IPI_CALL_FUNC\n",this_cpu);
 199 #endif /* kDEBUG */
 200                                 ops &= ~(1 << IPI_CALL_FUNC);
 201                                 {
 202                                         volatile struct smp_call_struct *data;
 203                                         void (*func)(void *info);
 204                                         void *info;
 205                                         int wait;
 206
 207                                         data = smp_call_function_data;
 208                                         func = data->func;
 209                                         info = data->info;
 210                                         wait = data->wait;
 211
 212                                         mb();
 213                                         atomic_dec ((atomic_t *)&data->unstarted_count);
 214
 215                                         /* At this point, *data can't
 216                                          * be relied upon.
 217                                          */
 218
 219                                         (*func)(info);
 220
 221                                         /* Notify the sending CPU that the
 222                                          * task is done.
 223                                          */
 224                                         mb();
 225                                         if (wait)
 226                                                 atomic_dec ((atomic_t *)&data->unfinished_count);
 227                                 }
 228                                 break;
 229
 230                         case IPI_CPU_START:
 231 #if (kDEBUG>=100)
 232                                 printk(KERN_DEBUG "CPU%d IPI_CPU_START\n",this_cpu);
 233 #endif /* kDEBUG */
 234                                 ops &= ~(1 << IPI_CPU_START);
 235 #ifdef ENTRY_SYS_CPUS
 236                                 p->state = STATE_RUNNING;
 237 #endif
 238                                 break;
 239
 240                         case IPI_CPU_STOP:
 241 #if (kDEBUG>=100)
 242                                 printk(KERN_DEBUG "CPU%d IPI_CPU_STOP\n",this_cpu);
 243 #endif /* kDEBUG */
 244                                 ops &= ~(1 << IPI_CPU_STOP);
 245 #ifdef ENTRY_SYS_CPUS
 246 #else
 247                                 halt_processor();
 248 #endif
 249                                 break;
 250
 251                         case IPI_CPU_TEST:
 252 #if (kDEBUG>=100)
 253                                 printk(KERN_DEBUG "CPU%d is alive!\n",this_cpu);
 254 #endif /* kDEBUG */
 255                                 ops &= ~(1 << IPI_CPU_TEST);
 256                                 break;
 257
 258                         default:
 259                                 printk(KERN_CRIT "Unknown IPI num on CPU%d: %lu\n",
 260                                         this_cpu, which);
 261                                 ops &= ~(1 << which);
 262                                 return IRQ_NONE;
 263                         } /* Switch */
 264                 } /* while (ops) */
 265         }
 266         return IRQ_HANDLED;
 267 }
 268
 269
 270 static inline void
 271 ipi_send(int cpu, enum ipi_message_type op)
 272 {
 273         struct cpuinfo_parisc *p = &cpu_data[cpu];
 274         unsigned long flags;
 275
 276         spin_lock_irqsave(&(p->lock),flags);
 277         p->pending_ipi |= 1 << op;
 278         gsc_writel(IPI_IRQ - CPU_IRQ_BASE, cpu_data[cpu].hpa);
 279         spin_unlock_irqrestore(&(p->lock),flags);
 280 }
 281
 282
 283 static inline void
 284 send_IPI_single(int dest_cpu, enum ipi_message_type op)
 285 {
 286         if (dest_cpu == NO_PROC_ID) {
 287                 BUG();
 288                 return;
 289         }
 290
 291         ipi_send(dest_cpu, op);
 292 }
 293
 294 static inline void
 295 send_IPI_allbutself(enum ipi_message_type op)
 296 {
 297         int i;
 298
 299         for (i = 0; i < NR_CPUS; i++) {
 300                 if (cpu_online(i) && i != smp_processor_id())
 301                         send_IPI_single(i, op);
 302         }
 303 }
 304
 305
 306 inline void
 307 smp_send_stop(void)     { send_IPI_allbutself(IPI_CPU_STOP); }
 308
 309 static inline void
 310 smp_send_start(void)    { send_IPI_allbutself(IPI_CPU_START); }
 311
 312 void
 313 smp_send_reschedule(int cpu) { send_IPI_single(cpu, IPI_RESCHEDULE); }
 314
 315
 316 /**
 317  * Run a function on all other CPUs.
 318  *  <func>      The function to run. This must be fast and non-blocking.
 319  *  <info>      An arbitrary pointer to pass to the function.
 320  *  <retry>     If true, keep retrying until ready.
 321  *  <wait>      If true, wait until function has completed on other CPUs.
 322  *  [RETURNS]   0 on success, else a negative status code.
 323  *
 324  * Does not return until remote CPUs are nearly ready to execute <func>
 325  * or have executed.
 326  */
 327
 328 int
 329 smp_call_function (void (*func) (void *info), void *info, int retry, int wait)
 330 {
 331         struct smp_call_struct data;
 332         unsigned long timeout;
 333         static DEFINE_SPINLOCK(lock);
 334         int retries = 0;
 335
 336         if (num_online_cpus() < 2)
 337                 return 0;
 338
 339         /* Can deadlock when called with interrupts disabled */
 340         WARN_ON(irqs_disabled());
 341
 342         /* can also deadlock if IPIs are disabled */
 343         WARN_ON((get_eiem() & (1UL<<(CPU_IRQ_MAX - IPI_IRQ))) == 0);
 344
 345
 346         data.func = func;
 347         data.info = info;
 348         data.wait = wait;
 349         atomic_set(&data.unstarted_count, num_online_cpus() - 1);
 350         atomic_set(&data.unfinished_count, num_online_cpus() - 1);
 351
 352         if (retry) {
 353                 spin_lock (&lock);
 354                 while (smp_call_function_data != 0)
 355                         barrier();
 356         }
 357         else {
 358                 spin_lock (&lock);
 359                 if (smp_call_function_data) {
 360                         spin_unlock (&lock);
 361                         return -EBUSY;
 362                 }
 363         }
 364
 365         smp_call_function_data = &data;
 366         spin_unlock (&lock);
 367
 368         /*  Send a message to all other CPUs and wait for them to respond  */
 369         send_IPI_allbutself(IPI_CALL_FUNC);
 370
 371  retry:
 372         /*  Wait for response  */
 373         timeout = jiffies + HZ;
 374         while ( (atomic_read (&data.unstarted_count) > 0) &&
 375                 time_before (jiffies, timeout) )
 376                 barrier ();
 377
 378         if (atomic_read (&data.unstarted_count) > 0) {
 379                 printk(KERN_CRIT "SMP CALL FUNCTION TIMED OUT! (cpu=%d), try %d\n",
 380                       smp_processor_id(), ++retries);
 381                 goto retry;
 382         }
 383         /* We either got one or timed out. Release the lock */
 384
 385         mb();
 386         smp_call_function_data = NULL;
 387
 388         while (wait && atomic_read (&data.unfinished_count) > 0)
 389                         barrier ();
 390
 391         return 0;
 392 }
 393
 394 EXPORT_SYMBOL(smp_call_function);
 395
 396 /*
 397  * Flush all other CPU's tlb and then mine.  Do this with on_each_cpu()
 398  * as we want to ensure all TLB's flushed before proceeding.
 399  */
 400
 401 extern void flush_tlb_all_local(void);
 402
 403 void
 404 smp_flush_tlb_all(void)
 405 {
 406         on_each_cpu((void (*)(void *))flush_tlb_all_local, NULL, 1, 1);
 407 }
 408
 409
 410 void
 411 smp_do_timer(struct pt_regs *regs)
 412 {
 413         int cpu = smp_processor_id();
 414         struct cpuinfo_parisc *data = &cpu_data[cpu];
 415
 416         if (!--data->prof_counter) {
 417                 data->prof_counter = data->prof_multiplier;
 418                 update_process_times(user_mode(regs));
 419         }
 420 }
 421
 422 /*
 423  * Called by secondaries to update state and initialize CPU registers.
 424  */
 425 static void __init
 426 smp_cpu_init(int cpunum)
 427 {
 428         extern int init_per_cpu(int);  /* arch/parisc/kernel/setup.c */
 429         extern void init_IRQ(void);    /* arch/parisc/kernel/irq.c */
 430
 431         /* Set modes and Enable floating point coprocessor */
 432         (void) init_per_cpu(cpunum);
 433
 434         disable_sr_hashing();
 435
 436         mb();
 437
 438         /* Well, support 2.4 linux scheme as well. */
 439         if (cpu_test_and_set(cpunum, cpu_online_map))
 440         {
 441                 extern void machine_halt(void); /* arch/parisc.../process.c */
 442
 443                 printk(KERN_CRIT "CPU#%d already initialized!\n", cpunum);
 444                 machine_halt();
 445         }
 446
 447         /* Initialise the idle task for this CPU */
 448         atomic_inc(&init_mm.mm_count);
 449         current->active_mm = &init_mm;
 450         if(current->mm)
 451                 BUG();
 452         enter_lazy_tlb(&init_mm, current);
 453
 454         init_IRQ();   /* make sure no IRQ's are enabled or pending */
 455 }
 456
 457
 458 /*
 459  * Slaves start using C here. Indirectly called from smp_slave_stext.
 460  * Do what start_kernel() and main() do for boot strap processor (aka monarch)
 461  */
 462 void __init smp_callin(void)
 463 {
 464         int slave_id = cpu_now_booting;
 465 #if 0
 466         void *istack;
 467 #endif
 468
 469         smp_cpu_init(slave_id);
 470         preempt_disable();
 471
 472 #if 0   /* NOT WORKING YET - see entry.S */
 473         istack = (void *)__get_free_pages(GFP_KERNEL,ISTACK_ORDER);
 474         if (istack == NULL) {
 475             printk(KERN_CRIT "Failed to allocate interrupt stack for cpu %d\n",slave_id);
 476             BUG();
 477         }
 478         mtctl(istack,31);
 479 #endif
 480
 481         flush_cache_all_local(); /* start with known state */
 482         flush_tlb_all_local();
 483
 484         local_irq_enable();  /* Interrupts have been off until now */
 485
 486         cpu_idle();      /* Wait for timer to schedule some work */
 487
 488         /* NOTREACHED */
 489         panic("smp_callin() AAAAaaaaahhhh....\n");
 490 }
 491
 492 /*
 493  * Bring one cpu online.
 494  */
 495 int __init smp_boot_one_cpu(int cpuid)
 496 {
 497         struct task_struct *idle;
 498         long timeout;
 499
 500         /*
 501          * Create an idle task for this CPU.  Note the address wed* give
 502          * to kernel_thread is irrelevant -- it's going to start
 503          * where OS_BOOT_RENDEVZ vector in SAL says to start.  But
 504          * this gets all the other task-y sort of data structures set
 505          * up like we wish.   We need to pull the just created idle task
 506          * off the run queue and stuff it into the init_tasks[] array.
 507          * Sheesh . . .
 508          */
 509
 510         idle = fork_idle(cpuid);
 511         if (IS_ERR(idle))
 512                 panic("SMP: fork failed for CPU:%d", cpuid);
 513
 514         idle->thread_info->cpu = cpuid;
 515
 516         /* Let _start know what logical CPU we're booting
 517         ** (offset into init_tasks[],cpu_data[])
 518         */
 519         cpu_now_booting = cpuid;
 520
 521         /*
 522         ** boot strap code needs to know the task address since
 523         ** it also contains the process stack.
 524         */
 525         smp_init_current_idle_task = idle ;
 526         mb();
 527
 528         printk("Releasing cpu %d now, hpa=%lx\n", cpuid, cpu_data[cpuid].hpa);
 529
 530         /*
 531         ** This gets PDC to release the CPU from a very tight loop.
 532         **
 533         ** From the PA-RISC 2.0 Firmware Architecture Reference Specification:
 534         ** "The MEM_RENDEZ vector specifies the location of OS_RENDEZ which
 535         ** is executed after receiving the rendezvous signal (an interrupt to
 536         ** EIR{0}). MEM_RENDEZ is valid only when it is nonzero and the
 537         ** contents of memory are valid."
 538         */
 539         gsc_writel(TIMER_IRQ - CPU_IRQ_BASE, cpu_data[cpuid].hpa);
 540         mb();
 541
 542         /*
 543          * OK, wait a bit for that CPU to finish staggering about.
 544          * Slave will set a bit when it reaches smp_cpu_init().
 545          * Once the "monarch CPU" sees the bit change, it can move on.
 546          */
 547         for (timeout = 0; timeout < 10000; timeout++) {
 548                 if(cpu_online(cpuid)) {
 549                         /* Which implies Slave has started up */
 550                         cpu_now_booting = 0;
 551                         smp_init_current_idle_task = NULL;
 552                         goto alive ;
 553                 }
 554                 udelay(100);
 555                 barrier();
 556         }
 557
 558         put_task_struct(idle);
 559         idle = NULL;
 560
 561         printk(KERN_CRIT "SMP: CPU:%d is stuck.\n", cpuid);
 562         return -1;
 563
 564 alive:
 565         /* Remember the Slave data */
 566 #if (kDEBUG>=100)
 567         printk(KERN_DEBUG "SMP: CPU:%d came alive after %ld _us\n",
 568                 cpuid, timeout * 100);
 569 #endif /* kDEBUG */
 570 #ifdef ENTRY_SYS_CPUS
 571         cpu_data[cpuid].state = STATE_RUNNING;
 572 #endif
 573         return 0;
 574 }
 575
 576 void __devinit smp_prepare_boot_cpu(void)
 577 {
 578         int bootstrap_processor=cpu_data[0].cpuid;      /* CPU ID of BSP */
 579
 580 #ifdef ENTRY_SYS_CPUS
 581         cpu_data[0].state = STATE_RUNNING;
 582 #endif
 583
 584         /* Setup BSP mappings */
 585         printk("SMP: bootstrap CPU ID is %d\n",bootstrap_processor);
 586
 587         cpu_set(bootstrap_processor, cpu_online_map);
 588         cpu_set(bootstrap_processor, cpu_present_map);
 589 }
 590
 591
 592
 593 /*
 594 ** inventory.c:do_inventory() hasn't yet been run and thus we
 595 ** don't 'discover' the additional CPU's until later.
 596 */
 597 void __init smp_prepare_cpus(unsigned int max_cpus)
 598 {
 599         cpus_clear(cpu_present_map);
 600         cpu_set(0, cpu_present_map);
 601
 602         parisc_max_cpus = max_cpus;
 603         if (!max_cpus)
 604                 printk(KERN_INFO "SMP mode deactivated.\n");
 605 }
 606
 607
 608 void smp_cpus_done(unsigned int cpu_max)
 609 {
 610         return;
 611 }
 612
 613
 614 int __devinit __cpu_up(unsigned int cpu)
 615 {
 616         if (cpu != 0 && cpu < parisc_max_cpus)
 617                 smp_boot_one_cpu(cpu);
 618
 619         return cpu_online(cpu) ? 0 : -ENOSYS;
 620 }
 621
 622
 623
 624 #ifdef ENTRY_SYS_CPUS
 625 /* Code goes along with:
 626 **    entry.s:        ENTRY_NAME(sys_cpus)   / * 215, for cpu stat * /
 627 */
 628 int sys_cpus(int argc, char **argv)
 629 {
 630         int i,j=0;
 631         extern int current_pid(int cpu);
 632
 633         if( argc > 2 ) {
 634                 printk("sys_cpus:Only one argument supported\n");
 635                 return (-1);
 636         }
 637         if ( argc == 1 ){
 638
 639 #ifdef DUMP_MORE_STATE
 640                 for(i=0; i<NR_CPUS; i++) {
 641                         int cpus_per_line = 4;
 642                         if(cpu_online(i)) {
 643                                 if (j++ % cpus_per_line)
 644                                         printk(" %3d",i);
 645                                 else
 646                                         printk("\n %3d",i);
 647                         }
 648                 }
 649                 printk("\n");
 650 #else
 651                 printk("\n 0\n");
 652 #endif
 653         } else if((argc==2) && !(strcmp(argv[1],"-l"))) {
 654                 printk("\nCPUSTATE  TASK CPUNUM CPUID HARDCPU(HPA)\n");
 655 #ifdef DUMP_MORE_STATE
 656                 for(i=0;i<NR_CPUS;i++) {
 657                         if (!cpu_online(i))
 658                                 continue;
 659                         if (cpu_data[i].cpuid != NO_PROC_ID) {
 660                                 switch(cpu_data[i].state) {
 661                                         case STATE_RENDEZVOUS:
 662                                                 printk("RENDEZVS ");
 663                                                 break;
 664                                         case STATE_RUNNING:
 665                                                 printk((current_pid(i)!=0) ? "RUNNING  " : "IDLING   ");
 666                                                 break;
 667                                         case STATE_STOPPED:
 668                                                 printk("STOPPED  ");
 669                                                 break;
 670                                         case STATE_HALTED:
 671                                                 printk("HALTED   ");
 672                                                 break;
 673                                         default:
 674                                                 printk("%08x?", cpu_data[i].state);
 675                                                 break;
 676                                 }
 677                                 if(cpu_online(i)) {
 678                                         printk(" %4d",current_pid(i));
 679                                 }
 680                                 printk(" %6d",cpu_number_map(i));
 681                                 printk(" %5d",i);
 682                                 printk(" 0x%lx\n",cpu_data[i].hpa);
 683                         }
 684                 }
 685 #else
 686                 printk("\n%s  %4d      0     0 --------",
 687                         (current->pid)?"RUNNING ": "IDLING  ",current->pid);
 688 #endif
 689         } else if ((argc==2) && !(strcmp(argv[1],"-s"))) {
 690 #ifdef DUMP_MORE_STATE
 691                 printk("\nCPUSTATE   CPUID\n");
 692                 for (i=0;i<NR_CPUS;i++) {
 693                         if (!cpu_online(i))
 694                                 continue;
 695                         if (cpu_data[i].cpuid != NO_PROC_ID) {
 696                                 switch(cpu_data[i].state) {
 697                                         case STATE_RENDEZVOUS:
 698                                                 printk("RENDEZVS");break;
 699                                         case STATE_RUNNING:
 700                                                 printk((current_pid(i)!=0) ? "RUNNING " : "IDLING");
 701                                                 break;
 702                                         case STATE_STOPPED:
 703                                                 printk("STOPPED ");break;
 704                                         case STATE_HALTED:
 705                                                 printk("HALTED  ");break;
 706                                         default:
 707                                 }
 708                                 printk("  %5d\n",i);
 709                         }
 710                 }
 711 #else
 712                 printk("\n%s    CPU0",(current->pid==0)?"RUNNING ":"IDLING  ");
 713 #endif
 714         } else {
 715                 printk("sys_cpus:Unknown request\n");
 716                 return (-1);
 717         }
 718         return 0;
 719 }
 720 #endif /* ENTRY_SYS_CPUS */
 721
 722 #ifdef CONFIG_PROC_FS
 723 int __init
 724 setup_profiling_timer(unsigned int multiplier)
 725 {
 726         return -EINVAL;
 727 }
 728 #endif