| 1 | /* |
| 2 | * linux/arch/arm/kernel/smp.c |
| 3 | * |
| 4 | * Copyright (C) 2002 ARM Limited, All Rights Reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/delay.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/spinlock.h> |
| 14 | #include <linux/sched.h> |
| 15 | #include <linux/interrupt.h> |
| 16 | #include <linux/cache.h> |
| 17 | #include <linux/profile.h> |
| 18 | #include <linux/errno.h> |
| 19 | #include <linux/mm.h> |
| 20 | #include <linux/err.h> |
| 21 | #include <linux/cpu.h> |
| 22 | #include <linux/smp.h> |
| 23 | #include <linux/seq_file.h> |
| 24 | #include <linux/irq.h> |
| 25 | |
| 26 | #include <asm/atomic.h> |
| 27 | #include <asm/cacheflush.h> |
| 28 | #include <asm/cpu.h> |
| 29 | #include <asm/mmu_context.h> |
| 30 | #include <asm/pgtable.h> |
| 31 | #include <asm/pgalloc.h> |
| 32 | #include <asm/processor.h> |
| 33 | #include <asm/tlbflush.h> |
| 34 | #include <asm/ptrace.h> |
| 35 | |
| 36 | /* |
| 37 | * as from 2.5, kernels no longer have an init_tasks structure |
| 38 | * so we need some other way of telling a new secondary core |
| 39 | * where to place its SVC stack |
| 40 | */ |
| 41 | struct secondary_data secondary_data; |
| 42 | |
| 43 | /* |
| 44 | * structures for inter-processor calls |
| 45 | * - A collection of single bit ipi messages. |
| 46 | */ |
| 47 | struct ipi_data { |
| 48 | spinlock_t lock; |
| 49 | unsigned long ipi_count; |
| 50 | unsigned long bits; |
| 51 | }; |
| 52 | |
| 53 | static DEFINE_PER_CPU(struct ipi_data, ipi_data) = { |
| 54 | .lock = SPIN_LOCK_UNLOCKED, |
| 55 | }; |
| 56 | |
| 57 | enum ipi_msg_type { |
| 58 | IPI_TIMER, |
| 59 | IPI_RESCHEDULE, |
| 60 | IPI_CALL_FUNC, |
| 61 | IPI_CALL_FUNC_SINGLE, |
| 62 | IPI_CPU_STOP, |
| 63 | }; |
| 64 | |
| 65 | int __cpuinit __cpu_up(unsigned int cpu) |
| 66 | { |
| 67 | struct cpuinfo_arm *ci = &per_cpu(cpu_data, cpu); |
| 68 | struct task_struct *idle = ci->idle; |
| 69 | pgd_t *pgd; |
| 70 | pmd_t *pmd; |
| 71 | int ret; |
| 72 | |
| 73 | /* |
| 74 | * Spawn a new process manually, if not already done. |
| 75 | * Grab a pointer to its task struct so we can mess with it |
| 76 | */ |
| 77 | if (!idle) { |
| 78 | idle = fork_idle(cpu); |
| 79 | if (IS_ERR(idle)) { |
| 80 | printk(KERN_ERR "CPU%u: fork() failed\n", cpu); |
| 81 | return PTR_ERR(idle); |
| 82 | } |
| 83 | ci->idle = idle; |
| 84 | } |
| 85 | |
| 86 | /* |
| 87 | * Allocate initial page tables to allow the new CPU to |
| 88 | * enable the MMU safely. This essentially means a set |
| 89 | * of our "standard" page tables, with the addition of |
| 90 | * a 1:1 mapping for the physical address of the kernel. |
| 91 | */ |
| 92 | pgd = pgd_alloc(&init_mm); |
| 93 | pmd = pmd_offset(pgd + pgd_index(PHYS_OFFSET), PHYS_OFFSET); |
| 94 | *pmd = __pmd((PHYS_OFFSET & PGDIR_MASK) | |
| 95 | PMD_TYPE_SECT | PMD_SECT_AP_WRITE); |
| 96 | flush_pmd_entry(pmd); |
| 97 | |
| 98 | /* |
| 99 | * We need to tell the secondary core where to find |
| 100 | * its stack and the page tables. |
| 101 | */ |
| 102 | secondary_data.stack = task_stack_page(idle) + THREAD_START_SP; |
| 103 | secondary_data.pgdir = virt_to_phys(pgd); |
| 104 | wmb(); |
| 105 | |
| 106 | /* |
| 107 | * Now bring the CPU into our world. |
| 108 | */ |
| 109 | ret = boot_secondary(cpu, idle); |
| 110 | if (ret == 0) { |
| 111 | unsigned long timeout; |
| 112 | |
| 113 | /* |
| 114 | * CPU was successfully started, wait for it |
| 115 | * to come online or time out. |
| 116 | */ |
| 117 | timeout = jiffies + HZ; |
| 118 | while (time_before(jiffies, timeout)) { |
| 119 | if (cpu_online(cpu)) |
| 120 | break; |
| 121 | |
| 122 | udelay(10); |
| 123 | barrier(); |
| 124 | } |
| 125 | |
| 126 | if (!cpu_online(cpu)) |
| 127 | ret = -EIO; |
| 128 | } |
| 129 | |
| 130 | secondary_data.stack = NULL; |
| 131 | secondary_data.pgdir = 0; |
| 132 | |
| 133 | *pmd = __pmd(0); |
| 134 | clean_pmd_entry(pmd); |
| 135 | pgd_free(&init_mm, pgd); |
| 136 | |
| 137 | if (ret) { |
| 138 | printk(KERN_CRIT "CPU%u: processor failed to boot\n", cpu); |
| 139 | |
| 140 | /* |
| 141 | * FIXME: We need to clean up the new idle thread. --rmk |
| 142 | */ |
| 143 | } |
| 144 | |
| 145 | return ret; |
| 146 | } |
| 147 | |
| 148 | #ifdef CONFIG_HOTPLUG_CPU |
| 149 | /* |
| 150 | * __cpu_disable runs on the processor to be shutdown. |
| 151 | */ |
| 152 | int __cpuexit __cpu_disable(void) |
| 153 | { |
| 154 | unsigned int cpu = smp_processor_id(); |
| 155 | struct task_struct *p; |
| 156 | int ret; |
| 157 | |
| 158 | ret = mach_cpu_disable(cpu); |
| 159 | if (ret) |
| 160 | return ret; |
| 161 | |
| 162 | /* |
| 163 | * Take this CPU offline. Once we clear this, we can't return, |
| 164 | * and we must not schedule until we're ready to give up the cpu. |
| 165 | */ |
| 166 | cpu_clear(cpu, cpu_online_map); |
| 167 | |
| 168 | /* |
| 169 | * OK - migrate IRQs away from this CPU |
| 170 | */ |
| 171 | migrate_irqs(); |
| 172 | |
| 173 | /* |
| 174 | * Stop the local timer for this CPU. |
| 175 | */ |
| 176 | local_timer_stop(); |
| 177 | |
| 178 | /* |
| 179 | * Flush user cache and TLB mappings, and then remove this CPU |
| 180 | * from the vm mask set of all processes. |
| 181 | */ |
| 182 | flush_cache_all(); |
| 183 | local_flush_tlb_all(); |
| 184 | |
| 185 | read_lock(&tasklist_lock); |
| 186 | for_each_process(p) { |
| 187 | if (p->mm) |
| 188 | cpu_clear(cpu, p->mm->cpu_vm_mask); |
| 189 | } |
| 190 | read_unlock(&tasklist_lock); |
| 191 | |
| 192 | return 0; |
| 193 | } |
| 194 | |
| 195 | /* |
| 196 | * called on the thread which is asking for a CPU to be shutdown - |
| 197 | * waits until shutdown has completed, or it is timed out. |
| 198 | */ |
| 199 | void __cpuexit __cpu_die(unsigned int cpu) |
| 200 | { |
| 201 | if (!platform_cpu_kill(cpu)) |
| 202 | printk("CPU%u: unable to kill\n", cpu); |
| 203 | } |
| 204 | |
| 205 | /* |
| 206 | * Called from the idle thread for the CPU which has been shutdown. |
| 207 | * |
| 208 | * Note that we disable IRQs here, but do not re-enable them |
| 209 | * before returning to the caller. This is also the behaviour |
| 210 | * of the other hotplug-cpu capable cores, so presumably coming |
| 211 | * out of idle fixes this. |
| 212 | */ |
| 213 | void __cpuexit cpu_die(void) |
| 214 | { |
| 215 | unsigned int cpu = smp_processor_id(); |
| 216 | |
| 217 | local_irq_disable(); |
| 218 | idle_task_exit(); |
| 219 | |
| 220 | /* |
| 221 | * actual CPU shutdown procedure is at least platform (if not |
| 222 | * CPU) specific |
| 223 | */ |
| 224 | platform_cpu_die(cpu); |
| 225 | |
| 226 | /* |
| 227 | * Do not return to the idle loop - jump back to the secondary |
| 228 | * cpu initialisation. There's some initialisation which needs |
| 229 | * to be repeated to undo the effects of taking the CPU offline. |
| 230 | */ |
| 231 | __asm__("mov sp, %0\n" |
| 232 | " b secondary_start_kernel" |
| 233 | : |
| 234 | : "r" (task_stack_page(current) + THREAD_SIZE - 8)); |
| 235 | } |
| 236 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 237 | |
| 238 | /* |
| 239 | * This is the secondary CPU boot entry. We're using this CPUs |
| 240 | * idle thread stack, but a set of temporary page tables. |
| 241 | */ |
| 242 | asmlinkage void __cpuinit secondary_start_kernel(void) |
| 243 | { |
| 244 | struct mm_struct *mm = &init_mm; |
| 245 | unsigned int cpu = smp_processor_id(); |
| 246 | |
| 247 | printk("CPU%u: Booted secondary processor\n", cpu); |
| 248 | |
| 249 | /* |
| 250 | * All kernel threads share the same mm context; grab a |
| 251 | * reference and switch to it. |
| 252 | */ |
| 253 | atomic_inc(&mm->mm_users); |
| 254 | atomic_inc(&mm->mm_count); |
| 255 | current->active_mm = mm; |
| 256 | cpu_set(cpu, mm->cpu_vm_mask); |
| 257 | cpu_switch_mm(mm->pgd, mm); |
| 258 | enter_lazy_tlb(mm, current); |
| 259 | local_flush_tlb_all(); |
| 260 | |
| 261 | cpu_init(); |
| 262 | preempt_disable(); |
| 263 | |
| 264 | /* |
| 265 | * Give the platform a chance to do its own initialisation. |
| 266 | */ |
| 267 | platform_secondary_init(cpu); |
| 268 | |
| 269 | /* |
| 270 | * Enable local interrupts. |
| 271 | */ |
| 272 | notify_cpu_starting(cpu); |
| 273 | local_irq_enable(); |
| 274 | local_fiq_enable(); |
| 275 | |
| 276 | /* |
| 277 | * Setup local timer for this CPU. |
| 278 | */ |
| 279 | local_timer_setup(); |
| 280 | |
| 281 | calibrate_delay(); |
| 282 | |
| 283 | smp_store_cpu_info(cpu); |
| 284 | |
| 285 | /* |
| 286 | * OK, now it's safe to let the boot CPU continue |
| 287 | */ |
| 288 | cpu_set(cpu, cpu_online_map); |
| 289 | |
| 290 | /* |
| 291 | * OK, it's off to the idle thread for us |
| 292 | */ |
| 293 | cpu_idle(); |
| 294 | } |
| 295 | |
| 296 | /* |
| 297 | * Called by both boot and secondaries to move global data into |
| 298 | * per-processor storage. |
| 299 | */ |
| 300 | void __cpuinit smp_store_cpu_info(unsigned int cpuid) |
| 301 | { |
| 302 | struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpuid); |
| 303 | |
| 304 | cpu_info->loops_per_jiffy = loops_per_jiffy; |
| 305 | } |
| 306 | |
| 307 | void __init smp_cpus_done(unsigned int max_cpus) |
| 308 | { |
| 309 | int cpu; |
| 310 | unsigned long bogosum = 0; |
| 311 | |
| 312 | for_each_online_cpu(cpu) |
| 313 | bogosum += per_cpu(cpu_data, cpu).loops_per_jiffy; |
| 314 | |
| 315 | printk(KERN_INFO "SMP: Total of %d processors activated " |
| 316 | "(%lu.%02lu BogoMIPS).\n", |
| 317 | num_online_cpus(), |
| 318 | bogosum / (500000/HZ), |
| 319 | (bogosum / (5000/HZ)) % 100); |
| 320 | } |
| 321 | |
| 322 | void __init smp_prepare_boot_cpu(void) |
| 323 | { |
| 324 | unsigned int cpu = smp_processor_id(); |
| 325 | |
| 326 | per_cpu(cpu_data, cpu).idle = current; |
| 327 | } |
| 328 | |
| 329 | static void send_ipi_message(const struct cpumask *mask, enum ipi_msg_type msg) |
| 330 | { |
| 331 | unsigned long flags; |
| 332 | unsigned int cpu; |
| 333 | |
| 334 | local_irq_save(flags); |
| 335 | |
| 336 | for_each_cpu(cpu, mask) { |
| 337 | struct ipi_data *ipi = &per_cpu(ipi_data, cpu); |
| 338 | |
| 339 | spin_lock(&ipi->lock); |
| 340 | ipi->bits |= 1 << msg; |
| 341 | spin_unlock(&ipi->lock); |
| 342 | } |
| 343 | |
| 344 | /* |
| 345 | * Call the platform specific cross-CPU call function. |
| 346 | */ |
| 347 | smp_cross_call(mask); |
| 348 | |
| 349 | local_irq_restore(flags); |
| 350 | } |
| 351 | |
| 352 | void arch_send_call_function_ipi_mask(const struct cpumask *mask) |
| 353 | { |
| 354 | send_ipi_message(mask, IPI_CALL_FUNC); |
| 355 | } |
| 356 | |
| 357 | void arch_send_call_function_single_ipi(int cpu) |
| 358 | { |
| 359 | send_ipi_message(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE); |
| 360 | } |
| 361 | |
| 362 | void show_ipi_list(struct seq_file *p) |
| 363 | { |
| 364 | unsigned int cpu; |
| 365 | |
| 366 | seq_puts(p, "IPI:"); |
| 367 | |
| 368 | for_each_present_cpu(cpu) |
| 369 | seq_printf(p, " %10lu", per_cpu(ipi_data, cpu).ipi_count); |
| 370 | |
| 371 | seq_putc(p, '\n'); |
| 372 | } |
| 373 | |
| 374 | void show_local_irqs(struct seq_file *p) |
| 375 | { |
| 376 | unsigned int cpu; |
| 377 | |
| 378 | seq_printf(p, "LOC: "); |
| 379 | |
| 380 | for_each_present_cpu(cpu) |
| 381 | seq_printf(p, "%10u ", irq_stat[cpu].local_timer_irqs); |
| 382 | |
| 383 | seq_putc(p, '\n'); |
| 384 | } |
| 385 | |
| 386 | static void ipi_timer(void) |
| 387 | { |
| 388 | irq_enter(); |
| 389 | local_timer_interrupt(); |
| 390 | irq_exit(); |
| 391 | } |
| 392 | |
| 393 | #ifdef CONFIG_LOCAL_TIMERS |
| 394 | asmlinkage void __exception do_local_timer(struct pt_regs *regs) |
| 395 | { |
| 396 | struct pt_regs *old_regs = set_irq_regs(regs); |
| 397 | int cpu = smp_processor_id(); |
| 398 | |
| 399 | if (local_timer_ack()) { |
| 400 | irq_stat[cpu].local_timer_irqs++; |
| 401 | ipi_timer(); |
| 402 | } |
| 403 | |
| 404 | set_irq_regs(old_regs); |
| 405 | } |
| 406 | #endif |
| 407 | |
| 408 | static DEFINE_SPINLOCK(stop_lock); |
| 409 | |
| 410 | /* |
| 411 | * ipi_cpu_stop - handle IPI from smp_send_stop() |
| 412 | */ |
| 413 | static void ipi_cpu_stop(unsigned int cpu) |
| 414 | { |
| 415 | spin_lock(&stop_lock); |
| 416 | printk(KERN_CRIT "CPU%u: stopping\n", cpu); |
| 417 | dump_stack(); |
| 418 | spin_unlock(&stop_lock); |
| 419 | |
| 420 | cpu_clear(cpu, cpu_online_map); |
| 421 | |
| 422 | local_fiq_disable(); |
| 423 | local_irq_disable(); |
| 424 | |
| 425 | while (1) |
| 426 | cpu_relax(); |
| 427 | } |
| 428 | |
| 429 | /* |
| 430 | * Main handler for inter-processor interrupts |
| 431 | * |
| 432 | * For ARM, the ipimask now only identifies a single |
| 433 | * category of IPI (Bit 1 IPIs have been replaced by a |
| 434 | * different mechanism): |
| 435 | * |
| 436 | * Bit 0 - Inter-processor function call |
| 437 | */ |
| 438 | asmlinkage void __exception do_IPI(struct pt_regs *regs) |
| 439 | { |
| 440 | unsigned int cpu = smp_processor_id(); |
| 441 | struct ipi_data *ipi = &per_cpu(ipi_data, cpu); |
| 442 | struct pt_regs *old_regs = set_irq_regs(regs); |
| 443 | |
| 444 | ipi->ipi_count++; |
| 445 | |
| 446 | for (;;) { |
| 447 | unsigned long msgs; |
| 448 | |
| 449 | spin_lock(&ipi->lock); |
| 450 | msgs = ipi->bits; |
| 451 | ipi->bits = 0; |
| 452 | spin_unlock(&ipi->lock); |
| 453 | |
| 454 | if (!msgs) |
| 455 | break; |
| 456 | |
| 457 | do { |
| 458 | unsigned nextmsg; |
| 459 | |
| 460 | nextmsg = msgs & -msgs; |
| 461 | msgs &= ~nextmsg; |
| 462 | nextmsg = ffz(~nextmsg); |
| 463 | |
| 464 | switch (nextmsg) { |
| 465 | case IPI_TIMER: |
| 466 | ipi_timer(); |
| 467 | break; |
| 468 | |
| 469 | case IPI_RESCHEDULE: |
| 470 | /* |
| 471 | * nothing more to do - eveything is |
| 472 | * done on the interrupt return path |
| 473 | */ |
| 474 | break; |
| 475 | |
| 476 | case IPI_CALL_FUNC: |
| 477 | generic_smp_call_function_interrupt(); |
| 478 | break; |
| 479 | |
| 480 | case IPI_CALL_FUNC_SINGLE: |
| 481 | generic_smp_call_function_single_interrupt(); |
| 482 | break; |
| 483 | |
| 484 | case IPI_CPU_STOP: |
| 485 | ipi_cpu_stop(cpu); |
| 486 | break; |
| 487 | |
| 488 | default: |
| 489 | printk(KERN_CRIT "CPU%u: Unknown IPI message 0x%x\n", |
| 490 | cpu, nextmsg); |
| 491 | break; |
| 492 | } |
| 493 | } while (msgs); |
| 494 | } |
| 495 | |
| 496 | set_irq_regs(old_regs); |
| 497 | } |
| 498 | |
| 499 | void smp_send_reschedule(int cpu) |
| 500 | { |
| 501 | send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE); |
| 502 | } |
| 503 | |
| 504 | void smp_timer_broadcast(const struct cpumask *mask) |
| 505 | { |
| 506 | send_ipi_message(mask, IPI_TIMER); |
| 507 | } |
| 508 | |
| 509 | void smp_send_stop(void) |
| 510 | { |
| 511 | cpumask_t mask = cpu_online_map; |
| 512 | cpu_clear(smp_processor_id(), mask); |
| 513 | send_ipi_message(&mask, IPI_CPU_STOP); |
| 514 | } |
| 515 | |
| 516 | /* |
| 517 | * not supported here |
| 518 | */ |
| 519 | int setup_profiling_timer(unsigned int multiplier) |
| 520 | { |
| 521 | return -EINVAL; |
| 522 | } |
| 523 | |
| 524 | static void |
| 525 | on_each_cpu_mask(void (*func)(void *), void *info, int wait, |
| 526 | const struct cpumask *mask) |
| 527 | { |
| 528 | preempt_disable(); |
| 529 | |
| 530 | smp_call_function_many(mask, func, info, wait); |
| 531 | if (cpumask_test_cpu(smp_processor_id(), mask)) |
| 532 | func(info); |
| 533 | |
| 534 | preempt_enable(); |
| 535 | } |
| 536 | |
| 537 | /**********************************************************************/ |
| 538 | |
| 539 | /* |
| 540 | * TLB operations |
| 541 | */ |
| 542 | struct tlb_args { |
| 543 | struct vm_area_struct *ta_vma; |
| 544 | unsigned long ta_start; |
| 545 | unsigned long ta_end; |
| 546 | }; |
| 547 | |
| 548 | static inline void ipi_flush_tlb_all(void *ignored) |
| 549 | { |
| 550 | local_flush_tlb_all(); |
| 551 | } |
| 552 | |
| 553 | static inline void ipi_flush_tlb_mm(void *arg) |
| 554 | { |
| 555 | struct mm_struct *mm = (struct mm_struct *)arg; |
| 556 | |
| 557 | local_flush_tlb_mm(mm); |
| 558 | } |
| 559 | |
| 560 | static inline void ipi_flush_tlb_page(void *arg) |
| 561 | { |
| 562 | struct tlb_args *ta = (struct tlb_args *)arg; |
| 563 | |
| 564 | local_flush_tlb_page(ta->ta_vma, ta->ta_start); |
| 565 | } |
| 566 | |
| 567 | static inline void ipi_flush_tlb_kernel_page(void *arg) |
| 568 | { |
| 569 | struct tlb_args *ta = (struct tlb_args *)arg; |
| 570 | |
| 571 | local_flush_tlb_kernel_page(ta->ta_start); |
| 572 | } |
| 573 | |
| 574 | static inline void ipi_flush_tlb_range(void *arg) |
| 575 | { |
| 576 | struct tlb_args *ta = (struct tlb_args *)arg; |
| 577 | |
| 578 | local_flush_tlb_range(ta->ta_vma, ta->ta_start, ta->ta_end); |
| 579 | } |
| 580 | |
| 581 | static inline void ipi_flush_tlb_kernel_range(void *arg) |
| 582 | { |
| 583 | struct tlb_args *ta = (struct tlb_args *)arg; |
| 584 | |
| 585 | local_flush_tlb_kernel_range(ta->ta_start, ta->ta_end); |
| 586 | } |
| 587 | |
| 588 | void flush_tlb_all(void) |
| 589 | { |
| 590 | on_each_cpu(ipi_flush_tlb_all, NULL, 1); |
| 591 | } |
| 592 | |
| 593 | void flush_tlb_mm(struct mm_struct *mm) |
| 594 | { |
| 595 | on_each_cpu_mask(ipi_flush_tlb_mm, mm, 1, &mm->cpu_vm_mask); |
| 596 | } |
| 597 | |
| 598 | void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr) |
| 599 | { |
| 600 | struct tlb_args ta; |
| 601 | |
| 602 | ta.ta_vma = vma; |
| 603 | ta.ta_start = uaddr; |
| 604 | |
| 605 | on_each_cpu_mask(ipi_flush_tlb_page, &ta, 1, &vma->vm_mm->cpu_vm_mask); |
| 606 | } |
| 607 | |
| 608 | void flush_tlb_kernel_page(unsigned long kaddr) |
| 609 | { |
| 610 | struct tlb_args ta; |
| 611 | |
| 612 | ta.ta_start = kaddr; |
| 613 | |
| 614 | on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1); |
| 615 | } |
| 616 | |
| 617 | void flush_tlb_range(struct vm_area_struct *vma, |
| 618 | unsigned long start, unsigned long end) |
| 619 | { |
| 620 | struct tlb_args ta; |
| 621 | |
| 622 | ta.ta_vma = vma; |
| 623 | ta.ta_start = start; |
| 624 | ta.ta_end = end; |
| 625 | |
| 626 | on_each_cpu_mask(ipi_flush_tlb_range, &ta, 1, &vma->vm_mm->cpu_vm_mask); |
| 627 | } |
| 628 | |
| 629 | void flush_tlb_kernel_range(unsigned long start, unsigned long end) |
| 630 | { |
| 631 | struct tlb_args ta; |
| 632 | |
| 633 | ta.ta_start = start; |
| 634 | ta.ta_end = end; |
| 635 | |
| 636 | on_each_cpu(ipi_flush_tlb_kernel_range, &ta, 1); |
| 637 | } |