target/linux/generic/patches-3.3/330-mips-add-crash-and-kdump-support.patch

   1 From eee16330c9de9adf7880cce9f1d32e13f89706bb Mon Sep 17 00:00:00 2001
   2 From: Wu Zhangjin <wuzhangjin@gmail.com>
   3 Date: Tue, 11 Jan 2011 13:16:47 +0000
   4 Subject: MIPS: Add crash and kdump support
   5
   6 From: http://patchwork.linux-mips.org/patch/1025/
   7
   8 Hello folks,
   9
  10 Please find here MIPS crash and kdump patches.
  11 This is patch set of 3 patches:
  12 1. generic MIPS changes (kernel);
  13 2. MIPS Cavium Octeon board kexec/kdump code (kernel);
  14 3. Kexec user space MIPS changes.
  15
  16 Patches were tested on the latest linux-mips@ git kernel and the latest
  17 kexec-tools git on Cavium Octeon 50xx board.
  18
  19 I also made the same code working on RMI XLR/XLS boards for both
  20 mips32 and mips64 kernels.
  21
  22 Best regards,
  23 Maxim Uvarov.
  24
  25 ------
  26 [ Zhangjin: Several trivial building failure has been fixed.
  27
  28 Note: the 2nd patch can not be cleanly applied, but may be a good
  29 reference for the other board development:
  30
  31         + MIPS Cavium Octeon board kexec,kdump support
  32         http://patchwork.linux-mips.org/patch/1026/
  33
  34 And the 3rd patch has already been merged into the mainline kexec-tools:
  35
  36         + some kexec MIPS improvements
  37         http://patchwork.linux-mips.org/patch/1027/
  38
  39 kexec-tools is available here:
  40
  41         + http://horms.net/projects/kexec/
  42         git://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git
  43 ]
  44 Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
  45 ---
  46 (limited to 'arch/mips/kernel')
  47
  48 --- a/arch/mips/kernel/Makefile
  49 +++ b/arch/mips/kernel/Makefile
  50 @@ -97,7 +97,8 @@ obj-$(CONFIG_I8253)           += i8253.o
  51
  52  obj-$(CONFIG_GPIO_TXX9)                += gpio_txx9.o
  53
  54 -obj-$(CONFIG_KEXEC)            += machine_kexec.o relocate_kernel.o
  55 +obj-$(CONFIG_KEXEC)            += machine_kexec.o relocate_kernel.o crash.o
  56 +obj-$(CONFIG_CRASH_DUMP)       += crash_dump.o
  57  obj-$(CONFIG_EARLY_PRINTK)     += early_printk.o
  58  obj-$(CONFIG_SPINLOCK_TEST)    += spinlock_test.o
  59  obj-$(CONFIG_MIPS_MACHINE)     += mips_machine.o
  60 --- /dev/null
  61 +++ b/arch/mips/kernel/crash.c
  62 @@ -0,0 +1,75 @@
  63 +#include <linux/kernel.h>
  64 +#include <linux/smp.h>
  65 +#include <linux/reboot.h>
  66 +#include <linux/kexec.h>
  67 +#include <linux/bootmem.h>
  68 +#include <linux/crash_dump.h>
  69 +#include <linux/delay.h>
  70 +#include <linux/init.h>
  71 +#include <linux/irq.h>
  72 +#include <linux/types.h>
  73 +#include <linux/sched.h>
  74 +
  75 +#ifdef CONFIG_CRASH_DUMP
  76 +unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
  77 +#endif
  78 +
  79 +/* This keeps a track of which one is crashing cpu. */
  80 +int crashing_cpu = -1;
  81 +static cpumask_t cpus_in_crash = CPU_MASK_NONE;
  82 +
  83 +#ifdef CONFIG_SMP
  84 +void crash_shutdown_secondary(void *ignore)
  85 +{
  86 +       struct pt_regs *regs;
  87 +       int cpu = smp_processor_id();
  88 +
  89 +       regs = task_pt_regs(current);
  90 +
  91 +       if (!cpu_online(cpu))
  92 +               return;
  93 +
  94 +       local_irq_disable();
  95 +       if (!cpu_isset(cpu, cpus_in_crash))
  96 +               crash_save_cpu(regs, cpu);
  97 +       cpu_set(cpu, cpus_in_crash);
  98 +
  99 +       while (!atomic_read(&kexec_ready_to_reboot))
 100 +               cpu_relax();
 101 +       relocated_kexec_smp_wait(NULL);
 102 +       /* NOTREACHED */
 103 +}
 104 +
 105 +static void crash_kexec_prepare_cpus(void)
 106 +{
 107 +       unsigned int msecs;
 108 +
 109 +       unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */
 110 +
 111 +       dump_send_ipi(crash_shutdown_secondary);
 112 +       smp_wmb();
 113 +
 114 +       /*
 115 +        * The crash CPU sends an IPI and wait for other CPUs to
 116 +        * respond. Delay of at least 10 seconds.
 117 +        */
 118 +       printk(KERN_EMERG "Sending IPI to other cpus...\n");
 119 +       msecs = 10000;
 120 +       while ((cpus_weight(cpus_in_crash) < ncpus) && (--msecs > 0)) {
 121 +               cpu_relax();
 122 +               mdelay(1);
 123 +       }
 124 +}
 125 +
 126 +#else
 127 +static void crash_kexec_prepare_cpus(void) {}
 128 +#endif
 129 +
 130 +void default_machine_crash_shutdown(struct pt_regs *regs)
 131 +{
 132 +       local_irq_disable();
 133 +       crashing_cpu = smp_processor_id();
 134 +       crash_save_cpu(regs, crashing_cpu);
 135 +       crash_kexec_prepare_cpus();
 136 +       cpu_set(crashing_cpu, cpus_in_crash);
 137 +}
 138 --- /dev/null
 139 +++ b/arch/mips/kernel/crash_dump.c
 140 @@ -0,0 +1,86 @@
 141 +#include <linux/highmem.h>
 142 +#include <linux/bootmem.h>
 143 +#include <linux/crash_dump.h>
 144 +#include <asm/uaccess.h>
 145 +
 146 +#ifdef CONFIG_PROC_VMCORE
 147 +static int __init parse_elfcorehdr(char *p)
 148 +{
 149 +       if (p)
 150 +               elfcorehdr_addr = memparse(p, &p);
 151 +       return 1;
 152 +}
 153 +__setup("elfcorehdr=", parse_elfcorehdr);
 154 +#endif
 155 +
 156 +static int __init parse_savemaxmem(char *p)
 157 +{
 158 +       if (p)
 159 +               saved_max_pfn = (memparse(p, &p) >> PAGE_SHIFT) - 1;
 160 +
 161 +       return 1;
 162 +}
 163 +__setup("savemaxmem=", parse_savemaxmem);
 164 +
 165 +
 166 +static void *kdump_buf_page;
 167 +
 168 +/**
 169 + * copy_oldmem_page - copy one page from "oldmem"
 170 + * @pfn: page frame number to be copied
 171 + * @buf: target memory address for the copy; this can be in kernel address
 172 + *     space or user address space (see @userbuf)
 173 + * @csize: number of bytes to copy
 174 + * @offset: offset in bytes into the page (based on pfn) to begin the copy
 175 + * @userbuf: if set, @buf is in user address space, use copy_to_user(),
 176 + *     otherwise @buf is in kernel address space, use memcpy().
 177 + *
 178 + * Copy a page from "oldmem". For this page, there is no pte mapped
 179 + * in the current kernel.
 180 + *
 181 + * Calling copy_to_user() in atomic context is not desirable. Hence first
 182 + * copying the data to a pre-allocated kernel page and then copying to user
 183 + * space in non-atomic context.
 184 + */
 185 +ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
 186 +               size_t csize, unsigned long offset, int userbuf)
 187 +{
 188 +       void  *vaddr;
 189 +
 190 +       if (!csize)
 191 +               return 0;
 192 +
 193 +       vaddr = kmap_atomic_pfn(pfn, KM_PTE0);
 194 +
 195 +       if (!userbuf) {
 196 +               memcpy(buf, (vaddr + offset), csize);
 197 +               kunmap_atomic(vaddr, KM_PTE0);
 198 +       } else {
 199 +               if (!kdump_buf_page) {
 200 +                       printk(KERN_WARNING "Kdump: Kdump buffer page not"
 201 +                               " allocated\n");
 202 +                       return -EFAULT;
 203 +               }
 204 +               copy_page(kdump_buf_page, vaddr);
 205 +               kunmap_atomic(vaddr, KM_PTE0);
 206 +               if (copy_to_user(buf, (kdump_buf_page + offset), csize))
 207 +                       return -EFAULT;
 208 +       }
 209 +
 210 +       return csize;
 211 +}
 212 +
 213 +static int __init kdump_buf_page_init(void)
 214 +{
 215 +       int ret = 0;
 216 +
 217 +       kdump_buf_page = kmalloc(PAGE_SIZE, GFP_KERNEL);
 218 +       if (!kdump_buf_page) {
 219 +               printk(KERN_WARNING "Kdump: Failed to allocate kdump buffer"
 220 +                        " page\n");
 221 +               ret = -ENOMEM;
 222 +       }
 223 +
 224 +       return ret;
 225 +}
 226 +arch_initcall(kdump_buf_page_init);
 227 --- a/arch/mips/kernel/machine_kexec.c
 228 +++ b/arch/mips/kernel/machine_kexec.c
 229 @@ -19,9 +19,19 @@ extern const size_t relocate_new_kernel_
 230  extern unsigned long kexec_start_address;
 231  extern unsigned long kexec_indirection_page;
 232
 233 +int (*_machine_kexec_prepare)(struct kimage *) = NULL;
 234 +void (*_machine_kexec_shutdown)(void) = NULL;
 235 +void (*_machine_crash_shutdown)(struct pt_regs *regs) = NULL;
 236 +#ifdef CONFIG_SMP
 237 +void (*relocated_kexec_smp_wait) (void *);
 238 +atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
 239 +#endif
 240 +
 241  int
 242  machine_kexec_prepare(struct kimage *kimage)
 243  {
 244 +       if (_machine_kexec_prepare)
 245 +               return _machine_kexec_prepare(kimage);
 246         return 0;
 247  }
 248
 249 @@ -33,11 +43,17 @@ machine_kexec_cleanup(struct kimage *kim
 250  void
 251  machine_shutdown(void)
 252  {
 253 +       if (_machine_kexec_shutdown)
 254 +               _machine_kexec_shutdown();
 255  }
 256
 257  void
 258  machine_crash_shutdown(struct pt_regs *regs)
 259  {
 260 +       if (_machine_crash_shutdown)
 261 +               _machine_crash_shutdown(regs);
 262 +       else
 263 +               default_machine_crash_shutdown(regs);
 264  }
 265
 266  typedef void (*noretfun_t)(void) __attribute__((noreturn));
 267 @@ -52,7 +68,9 @@ machine_kexec(struct kimage *image)
 268         reboot_code_buffer =
 269           (unsigned long)page_address(image->control_code_page);
 270
 271 -       kexec_start_address = (unsigned long) phys_to_virt(image->start);
 272 +       kexec_start_address =
 273 +         (unsigned long) phys_to_virt(image->start);
 274 +
 275         kexec_indirection_page =
 276                 (unsigned long) phys_to_virt(image->head & PAGE_MASK);
 277
 278 @@ -63,7 +81,7 @@ machine_kexec(struct kimage *image)
 279          * The generic kexec code builds a page list with physical
 280          * addresses. they are directly accessible through KSEG0 (or
 281          * CKSEG0 or XPHYS if on 64bit system), hence the
 282 -        * pys_to_virt() call.
 283 +        * phys_to_virt() call.
 284          */
 285         for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE);
 286              ptr = (entry & IND_INDIRECTION) ?
 287 @@ -81,5 +99,13 @@ machine_kexec(struct kimage *image)
 288         printk("Will call new kernel at %08lx\n", image->start);
 289         printk("Bye ...\n");
 290         __flush_cache_all();
 291 +#ifdef CONFIG_SMP
 292 +       /* All secondary cpus now may jump to kexec_wait cycle */
 293 +       relocated_kexec_smp_wait = reboot_code_buffer +
 294 +               (void *)(kexec_smp_wait - relocate_new_kernel);
 295 +       smp_wmb();
 296 +       atomic_set(&kexec_ready_to_reboot, 1);
 297 +#endif
 298         ((noretfun_t) reboot_code_buffer)();
 299  }
 300 +
 301 --- a/arch/mips/kernel/relocate_kernel.S
 302 +++ b/arch/mips/kernel/relocate_kernel.S
 303 @@ -15,6 +15,11 @@
 304  #include <asm/addrspace.h>
 305
 306  LEAF(relocate_new_kernel)
 307 +       PTR_L a0,       arg0
 308 +       PTR_L a1,       arg1
 309 +       PTR_L a2,       arg2
 310 +       PTR_L a3,       arg3
 311 +
 312         PTR_L           s0, kexec_indirection_page
 313         PTR_L           s1, kexec_start_address
 314
 315 @@ -26,7 +31,6 @@ process_entry:
 316         and             s3, s2, 0x1
 317         beq             s3, zero, 1f
 318         and             s4, s2, ~0x1    /* store destination addr in s4 */
 319 -       move            a0, s4
 320         b               process_entry
 321
 322  1:
 323 @@ -60,23 +64,100 @@ copy_word:
 324         b               process_entry
 325
 326  done:
 327 +#ifdef CONFIG_SMP
 328 +       /* kexec_flag reset is signal to other CPUs what kernel
 329 +          was moved to it's location. Note - we need relocated address
 330 +          of kexec_flag.  */
 331 +
 332 +       bal             1f
 333 + 1:    move            t1,ra;
 334 +       PTR_LA          t2,1b
 335 +       PTR_LA          t0,kexec_flag
 336 +       PTR_SUB         t0,t0,t2;
 337 +       PTR_ADD         t0,t1,t0;
 338 +       LONG_S          zero,(t0)
 339 +#endif
 340 +
 341 +       sync
 342         /* jump to kexec_start_address */
 343         j               s1
 344         END(relocate_new_kernel)
 345
 346 -kexec_start_address:
 347 -       EXPORT(kexec_start_address)
 348 +#ifdef CONFIG_SMP
 349 +/*
 350 + * Other CPUs should wait until code is relocated and
 351 + * then start at entry (?) point.
 352 + */
 353 +LEAF(kexec_smp_wait)
 354 +       PTR_L           a0, s_arg0
 355 +       PTR_L           a1, s_arg1
 356 +       PTR_L           a2, s_arg2
 357 +       PTR_L           a3, s_arg3
 358 +       PTR_L           s1, kexec_start_address
 359 +
 360 +       /* Non-relocated address works for args and kexec_start_address ( old
 361 +        * kernel is not overwritten). But we need relocated address of
 362 +        * kexec_flag.
 363 +        */
 364 +
 365 +       bal             1f
 366 +1:     move            t1,ra;
 367 +       PTR_LA          t2,1b
 368 +       PTR_LA          t0,kexec_flag
 369 +       PTR_SUB         t0,t0,t2;
 370 +       PTR_ADD         t0,t1,t0;
 371 +
 372 +1:     LONG_L          s0, (t0)
 373 +       bne             s0, zero,1b
 374 +
 375 +       sync
 376 +       j               s1
 377 +       END(kexec_smp_wait)
 378 +#endif
 379 +
 380 +#ifdef __mips64
 381 +       /* all PTR's must be aligned to 8 byte in 64-bit mode */
 382 +       .align  3
 383 +#endif
 384 +
 385 +/* All parameters to new kernel are passed in registers a0-a3.
 386 + * kexec_args[0..3] are uses to prepare register values.
 387 + */
 388 +
 389 +EXPORT(kexec_args)
 390 +arg0:  PTR             0x0
 391 +arg1:  PTR             0x0
 392 +arg2:  PTR             0x0
 393 +arg3:  PTR             0x0
 394 +       .size   kexec_args,PTRSIZE*4
 395 +
 396 +#ifdef CONFIG_SMP
 397 +/*
 398 + * Secondary CPUs may have different kernel parameters in
 399 + * their registers a0-a3. secondary_kexec_args[0..3] are used
 400 + * to prepare register values.
 401 + */
 402 +EXPORT(secondary_kexec_args)
 403 +s_arg0:        PTR             0x0
 404 +s_arg1:        PTR             0x0
 405 +s_arg2:        PTR             0x0
 406 +s_arg3:        PTR             0x0
 407 +       .size   secondary_kexec_args,PTRSIZE*4
 408 +kexec_flag:
 409 +       LONG            0x1
 410 +
 411 +#endif
 412 +
 413 +EXPORT(kexec_start_address)
 414         PTR             0x0
 415         .size           kexec_start_address, PTRSIZE
 416
 417 -kexec_indirection_page:
 418 -       EXPORT(kexec_indirection_page)
 419 +EXPORT(kexec_indirection_page)
 420         PTR             0
 421         .size           kexec_indirection_page, PTRSIZE
 422
 423  relocate_new_kernel_end:
 424
 425 -relocate_new_kernel_size:
 426 -       EXPORT(relocate_new_kernel_size)
 427 +EXPORT(relocate_new_kernel_size)
 428         PTR             relocate_new_kernel_end - relocate_new_kernel
 429         .size           relocate_new_kernel_size, PTRSIZE
 430 --- a/arch/mips/kernel/setup.c
 431 +++ b/arch/mips/kernel/setup.c
 432 @@ -22,6 +22,7 @@
 433  #include <linux/console.h>
 434  #include <linux/pfn.h>
 435  #include <linux/debugfs.h>
 436 +#include <linux/kexec.h>
 437
 438  #include <asm/addrspace.h>
 439  #include <asm/bootinfo.h>
 440 @@ -523,12 +524,62 @@ static void __init arch_mem_init(char **
 441         }
 442
 443         bootmem_init();
 444 +#ifdef CONFIG_KEXEC
 445 +       if (crashk_res.start != crashk_res.end)
 446 +               reserve_bootmem(crashk_res.start,
 447 +                       crashk_res.end - crashk_res.start + 1,
 448 +                       BOOTMEM_DEFAULT);
 449 +#endif
 450         device_tree_init();
 451         sparse_init();
 452         plat_swiotlb_setup();
 453         paging_init();
 454  }
 455
 456 +#ifdef CONFIG_KEXEC
 457 +static inline unsigned long long get_total_mem(void)
 458 +{
 459 +       unsigned long long total;
 460 +       total = max_pfn - min_low_pfn;
 461 +       return total << PAGE_SHIFT;
 462 +}
 463 +
 464 +static void __init mips_parse_crashkernel(void)
 465 +{
 466 +       unsigned long long total_mem;
 467 +       unsigned long long crash_size, crash_base;
 468 +       int ret;
 469 +
 470 +       total_mem = get_total_mem();
 471 +       ret = parse_crashkernel(boot_command_line, total_mem,
 472 +                       &crash_size, &crash_base);
 473 +       if (ret != 0 || crash_size <= 0)
 474 +               return;
 475 +
 476 +       crashk_res.start = crash_base;
 477 +       crashk_res.end   = crash_base + crash_size - 1;
 478 +}
 479 +static void __init request_crashkernel(struct resource *res)
 480 +{
 481 +       int ret;
 482 +
 483 +       ret = request_resource(res, &crashk_res);
 484 +       if (!ret)
 485 +               printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 486 +                       "for crashkernel\n",
 487 +                       (unsigned long)((crashk_res.end -
 488 +                               crashk_res.start + 1) >> 20),
 489 +                       (unsigned long)(crashk_res.start  >> 20));
 490 +}
 491 +#else
 492 +static void __init mips_parse_crashkernel(void)
 493 +{
 494 +}
 495 +static void __init request_crashkernel(struct resource *res)
 496 +{
 497 +}
 498 +#endif
 499 +
 500  static void __init resource_init(void)
 501  {
 502         int i;
 503 @@ -544,6 +595,8 @@ static void __init resource_init(void)
 504         /*
 505          * Request address space for all standard RAM.
 506          */
 507 +       mips_parse_crashkernel();
 508 +
 509         for (i = 0; i < boot_mem_map.nr_map; i++) {
 510                 struct resource *res;
 511                 unsigned long start, end;
 512 @@ -580,6 +633,7 @@ static void __init resource_init(void)
 513                  */
 514                 request_resource(res, &code_resource);
 515                 request_resource(res, &data_resource);
 516 +               request_crashkernel(res);
 517         }
 518  }
 519
 520 --- a/arch/mips/kernel/smp.c
 521 +++ b/arch/mips/kernel/smp.c
 522 @@ -433,3 +433,21 @@ void flush_tlb_one(unsigned long vaddr)
 523
 524  EXPORT_SYMBOL(flush_tlb_page);
 525  EXPORT_SYMBOL(flush_tlb_one);
 526 +
 527 +#if defined(CONFIG_KEXEC)
 528 +void (*dump_ipi_function_ptr)(void *) = NULL;
 529 +void dump_send_ipi(void (*dump_ipi_callback)(void *))
 530 +{
 531 +       int i;
 532 +       int cpu = smp_processor_id();
 533 +
 534 +       dump_ipi_function_ptr = dump_ipi_callback;
 535 +       smp_mb();
 536 +       for_each_online_cpu(i)
 537 +               if (i != cpu)
 538 +                       core_send_ipi(i, SMP_DUMP);
 539 +
 540 +}
 541 +EXPORT_SYMBOL(dump_send_ipi);
 542 +#endif
 543 +
 544 --- a/arch/mips/include/asm/kexec.h
 545 +++ b/arch/mips/include/asm/kexec.h
 546 @@ -9,22 +9,45 @@
 547  #ifndef _MIPS_KEXEC
 548  # define _MIPS_KEXEC
 549
 550 +#include <asm/stacktrace.h>
 551 +
 552 +extern unsigned long long elfcorehdr_addr;
 553 +
 554  /* Maximum physical address we can use pages from */
 555  #define KEXEC_SOURCE_MEMORY_LIMIT (0x20000000)
 556  /* Maximum address we can reach in physical address mode */
 557  #define KEXEC_DESTINATION_MEMORY_LIMIT (0x20000000)
 558   /* Maximum address we can use for the control code buffer */
 559  #define KEXEC_CONTROL_MEMORY_LIMIT (0x20000000)
 560 -
 561 -#define KEXEC_CONTROL_PAGE_SIZE 4096
 562 +/* Reserve 3*4096 bytes for board-specific info */
 563 +#define KEXEC_CONTROL_PAGE_SIZE (4096 + 3*4096)
 564
 565  /* The native architecture */
 566  #define KEXEC_ARCH KEXEC_ARCH_MIPS
 567 +#define MAX_NOTE_BYTES 1024
 568
 569  static inline void crash_setup_regs(struct pt_regs *newregs,
 570 -                                   struct pt_regs *oldregs)
 571 +                                       struct pt_regs *oldregs)
 572  {
 573 -       /* Dummy implementation for now */
 574 +       if (oldregs)
 575 +               memcpy(newregs, oldregs, sizeof(*newregs));
 576 +       else
 577 +               prepare_frametrace(newregs);
 578  }
 579
 580 +#ifdef CONFIG_KEXEC
 581 +struct kimage;
 582 +extern unsigned long kexec_args[4];
 583 +extern int (*_machine_kexec_prepare)(struct kimage *);
 584 +extern void (*_machine_kexec_shutdown)(void);
 585 +extern void (*_machine_crash_shutdown)(struct pt_regs *regs);
 586 +extern void default_machine_crash_shutdown(struct pt_regs *regs);
 587 +#ifdef CONFIG_SMP
 588 +extern const unsigned char kexec_smp_wait[];
 589 +extern unsigned long secondary_kexec_args[4];
 590 +extern void (*relocated_kexec_smp_wait) (void *);
 591 +extern atomic_t kexec_ready_to_reboot;
 592 +#endif
 593 +#endif
 594 +
 595  #endif /* !_MIPS_KEXEC */
 596 --- a/arch/mips/include/asm/smp.h
 597 +++ b/arch/mips/include/asm/smp.h
 598 @@ -40,6 +40,8 @@ extern int __cpu_logical_map[NR_CPUS];
 599  #define SMP_CALL_FUNCTION      0x2
 600  /* Octeon - Tell another core to flush its icache */
 601  #define SMP_ICACHE_FLUSH       0x4
 602 +/* Used by kexec crashdump to save all cpu's state */
 603 +#define SMP_DUMP               0x8
 604
 605  extern volatile cpumask_t cpu_callin_map;
 606
 607 @@ -91,4 +93,9 @@ static inline void arch_send_call_functi
 608         mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION);
 609  }
 610
 611 +extern void core_send_ipi(int cpu, unsigned int action);
 612 +#if defined(CONFIG_KEXEC)
 613 +extern void (*dump_ipi_function_ptr)(void *);
 614 +void dump_send_ipi(void (*dump_ipi_callback)(void *));
 615 +#endif
 616  #endif /* __ASM_SMP_H */