1
2#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
3
4#include <linux/export.h>
5#include <linux/reboot.h>
6#include <linux/init.h>
7#include <linux/pm.h>
8#include <linux/efi.h>
9#include <linux/dmi.h>
10#include <linux/sched.h>
11#include <linux/tboot.h>
12#include <linux/delay.h>
13#include <linux/objtool.h>
14#include <linux/pgtable.h>
15#include <acpi/reboot.h>
16#include <asm/io.h>
17#include <asm/apic.h>
18#include <asm/io_apic.h>
19#include <asm/desc.h>
20#include <asm/hpet.h>
21#include <asm/proto.h>
22#include <asm/reboot_fixups.h>
23#include <asm/reboot.h>
24#include <asm/pci_x86.h>
25#include <asm/virtext.h>
26#include <asm/cpu.h>
27#include <asm/nmi.h>
28#include <asm/smp.h>
29
30#include <linux/ctype.h>
31#include <linux/mc146818rtc.h>
32#include <asm/realmode.h>
33#include <asm/x86_init.h>
34#include <asm/efi.h>
35
36
37
38
39void (*pm_power_off)(void);
40EXPORT_SYMBOL(pm_power_off);
41
42
43
44
45
46
47static int reboot_emergency;
48
49
50bool port_cf9_safe = false;
51
52
53
54
55
56
57
58
59
60static int __init set_acpi_reboot(const struct dmi_system_id *d)
61{
62 if (reboot_type != BOOT_ACPI) {
63 reboot_type = BOOT_ACPI;
64 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
65 d->ident, "ACPI");
66 }
67 return 0;
68}
69
70
71
72
73
74static int __init set_bios_reboot(const struct dmi_system_id *d)
75{
76 if (reboot_type != BOOT_BIOS) {
77 reboot_type = BOOT_BIOS;
78 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
79 d->ident, "BIOS");
80 }
81 return 0;
82}
83
84
85
86
87
88static int __init set_efi_reboot(const struct dmi_system_id *d)
89{
90 if (reboot_type != BOOT_EFI && !efi_runtime_disabled()) {
91 reboot_type = BOOT_EFI;
92 pr_info("%s series board detected. Selecting EFI-method for reboot.\n", d->ident);
93 }
94 return 0;
95}
96
97void __noreturn machine_real_restart(unsigned int type)
98{
99 local_irq_disable();
100
101
102
103
104
105
106
107
108
109
110
111 spin_lock(&rtc_lock);
112 CMOS_WRITE(0x00, 0x8f);
113 spin_unlock(&rtc_lock);
114
115
116
117
118#ifdef CONFIG_X86_32
119 load_cr3(initial_page_table);
120#else
121 write_cr3(real_mode_header->trampoline_pgd);
122
123
124 if (boot_cpu_has(X86_FEATURE_PCID))
125 cr4_clear_bits(X86_CR4_PCIDE);
126#endif
127
128
129#ifdef CONFIG_X86_32
130 asm volatile("jmpl *%0" : :
131 "rm" (real_mode_header->machine_real_restart_asm),
132 "a" (type));
133#else
134 asm volatile("ljmpl *%0" : :
135 "m" (real_mode_header->machine_real_restart_asm),
136 "D" (type));
137#endif
138 unreachable();
139}
140#ifdef CONFIG_APM_MODULE
141EXPORT_SYMBOL(machine_real_restart);
142#endif
143STACK_FRAME_NON_STANDARD(machine_real_restart);
144
145
146
147
148static int __init set_pci_reboot(const struct dmi_system_id *d)
149{
150 if (reboot_type != BOOT_CF9_FORCE) {
151 reboot_type = BOOT_CF9_FORCE;
152 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
153 d->ident, "PCI");
154 }
155 return 0;
156}
157
158static int __init set_kbd_reboot(const struct dmi_system_id *d)
159{
160 if (reboot_type != BOOT_KBD) {
161 reboot_type = BOOT_KBD;
162 pr_info("%s series board detected. Selecting %s-method for reboot.\n",
163 d->ident, "KBD");
164 }
165 return 0;
166}
167
168
169
170
171static const struct dmi_system_id reboot_dmi_table[] __initconst = {
172
173
174 {
175 .callback = set_kbd_reboot,
176 .ident = "Acer Aspire One A110",
177 .matches = {
178 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
179 DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
180 },
181 },
182 {
183 .callback = set_efi_reboot,
184 .ident = "Acer TravelMate X514-51T",
185 .matches = {
186 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
187 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate X514-51T"),
188 },
189 },
190
191
192 {
193 .callback = set_pci_reboot,
194 .ident = "Apple MacBook5",
195 .matches = {
196 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
197 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"),
198 },
199 },
200 {
201 .callback = set_pci_reboot,
202 .ident = "Apple MacBook6,1",
203 .matches = {
204 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
205 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook6,1"),
206 },
207 },
208 {
209 .callback = set_pci_reboot,
210 .ident = "Apple MacBookPro5",
211 .matches = {
212 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
213 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"),
214 },
215 },
216 {
217 .callback = set_pci_reboot,
218 .ident = "Apple Macmini3,1",
219 .matches = {
220 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
221 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"),
222 },
223 },
224 {
225 .callback = set_pci_reboot,
226 .ident = "Apple iMac9,1",
227 .matches = {
228 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
229 DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"),
230 },
231 },
232 {
233 .callback = set_pci_reboot,
234 .ident = "Apple iMac10,1",
235 .matches = {
236 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
237 DMI_MATCH(DMI_PRODUCT_NAME, "iMac10,1"),
238 },
239 },
240
241
242 {
243 .callback = set_pci_reboot,
244 .ident = "ASRock Q1900DC-ITX",
245 .matches = {
246 DMI_MATCH(DMI_BOARD_VENDOR, "ASRock"),
247 DMI_MATCH(DMI_BOARD_NAME, "Q1900DC-ITX"),
248 },
249 },
250
251
252 {
253 .callback = set_bios_reboot,
254 .ident = "ASUS P4S800",
255 .matches = {
256 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
257 DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
258 },
259 },
260 {
261 .callback = set_acpi_reboot,
262 .ident = "ASUS EeeBook X205TA",
263 .matches = {
264 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
265 DMI_MATCH(DMI_PRODUCT_NAME, "X205TA"),
266 },
267 },
268 {
269 .callback = set_acpi_reboot,
270 .ident = "ASUS EeeBook X205TAW",
271 .matches = {
272 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
273 DMI_MATCH(DMI_PRODUCT_NAME, "X205TAW"),
274 },
275 },
276
277
278 {
279 .callback = set_pci_reboot,
280 .ident = "Certec BPC600",
281 .matches = {
282 DMI_MATCH(DMI_SYS_VENDOR, "Certec"),
283 DMI_MATCH(DMI_PRODUCT_NAME, "BPC600"),
284 },
285 },
286
287
288 {
289 .callback = set_bios_reboot,
290 .ident = "Dell DXP061",
291 .matches = {
292 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
293 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
294 },
295 },
296 {
297 .callback = set_bios_reboot,
298 .ident = "Dell E520",
299 .matches = {
300 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
301 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
302 },
303 },
304 {
305 .callback = set_pci_reboot,
306 .ident = "Dell Latitude E5410",
307 .matches = {
308 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
309 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5410"),
310 },
311 },
312 {
313 .callback = set_pci_reboot,
314 .ident = "Dell Latitude E5420",
315 .matches = {
316 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
317 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"),
318 },
319 },
320 {
321 .callback = set_pci_reboot,
322 .ident = "Dell Latitude E6320",
323 .matches = {
324 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
325 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"),
326 },
327 },
328 {
329 .callback = set_pci_reboot,
330 .ident = "Dell Latitude E6420",
331 .matches = {
332 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
333 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"),
334 },
335 },
336 {
337 .callback = set_bios_reboot,
338 .ident = "Dell OptiPlex 330",
339 .matches = {
340 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
341 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
342 DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
343 },
344 },
345 {
346 .callback = set_bios_reboot,
347 .ident = "Dell OptiPlex 360",
348 .matches = {
349 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
350 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
351 DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
352 },
353 },
354 {
355 .callback = set_bios_reboot,
356 .ident = "Dell OptiPlex 745",
357 .matches = {
358 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
359 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
360 },
361 },
362 {
363 .callback = set_bios_reboot,
364 .ident = "Dell OptiPlex 745",
365 .matches = {
366 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
367 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
368 DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
369 },
370 },
371 {
372 .callback = set_bios_reboot,
373 .ident = "Dell OptiPlex 745",
374 .matches = {
375 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
376 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
377 DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
378 },
379 },
380 {
381 .callback = set_bios_reboot,
382 .ident = "Dell OptiPlex 760",
383 .matches = {
384 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
385 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
386 DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
387 },
388 },
389 {
390 .callback = set_pci_reboot,
391 .ident = "Dell OptiPlex 990 BIOS A0x",
392 .matches = {
393 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
394 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"),
395 DMI_MATCH(DMI_BIOS_VERSION, "A0"),
396 },
397 },
398 {
399 .callback = set_bios_reboot,
400 .ident = "Dell PowerEdge 300",
401 .matches = {
402 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
403 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
404 },
405 },
406 {
407 .callback = set_bios_reboot,
408 .ident = "Dell PowerEdge 1300",
409 .matches = {
410 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
411 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
412 },
413 },
414 {
415 .callback = set_bios_reboot,
416 .ident = "Dell PowerEdge 2400",
417 .matches = {
418 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
419 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
420 },
421 },
422 {
423 .callback = set_pci_reboot,
424 .ident = "Dell PowerEdge C6100",
425 .matches = {
426 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
427 DMI_MATCH(DMI_PRODUCT_NAME, "C6100"),
428 },
429 },
430 {
431 .callback = set_pci_reboot,
432 .ident = "Dell Precision M6600",
433 .matches = {
434 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
435 DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"),
436 },
437 },
438 {
439 .callback = set_bios_reboot,
440 .ident = "Dell Precision T5400",
441 .matches = {
442 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
443 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
444 },
445 },
446 {
447 .callback = set_bios_reboot,
448 .ident = "Dell Precision T7400",
449 .matches = {
450 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
451 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
452 },
453 },
454 {
455 .callback = set_bios_reboot,
456 .ident = "Dell XPS710",
457 .matches = {
458 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
459 DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
460 },
461 },
462 {
463 .callback = set_acpi_reboot,
464 .ident = "Dell OptiPlex 7450 AIO",
465 .matches = {
466 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
467 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 7450 AIO"),
468 },
469 },
470
471
472 {
473 .callback = set_bios_reboot,
474 .ident = "HP Compaq Laptop",
475 .matches = {
476 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
477 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
478 },
479 },
480
481 {
482 .callback = set_pci_reboot,
483 .ident = "Zotac ZBOX CI327 nano",
484 .matches = {
485 DMI_MATCH(DMI_SYS_VENDOR, "NA"),
486 DMI_MATCH(DMI_PRODUCT_NAME, "ZBOX-CI327NANO-GS-01"),
487 },
488 },
489
490
491 {
492 .callback = set_bios_reboot,
493 .ident = "Sony VGN-Z540N",
494 .matches = {
495 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
496 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
497 },
498 },
499
500 { }
501};
502
503static int __init reboot_init(void)
504{
505 int rv;
506
507
508
509
510
511 if (!reboot_default)
512 return 0;
513
514
515
516
517
518
519 rv = dmi_check_system(reboot_dmi_table);
520
521 if (!rv && efi_reboot_required() && !efi_runtime_disabled())
522 reboot_type = BOOT_EFI;
523
524 return 0;
525}
526core_initcall(reboot_init);
527
528static inline void kb_wait(void)
529{
530 int i;
531
532 for (i = 0; i < 0x10000; i++) {
533 if ((inb(0x64) & 0x02) == 0)
534 break;
535 udelay(2);
536 }
537}
538
539static void vmxoff_nmi(int cpu, struct pt_regs *regs)
540{
541 cpu_emergency_vmxoff();
542}
543
544
545static void emergency_vmx_disable_all(void)
546{
547
548 local_irq_disable();
549
550
551
552
553
554
555
556
557
558
559
560 if (cpu_has_vmx()) {
561
562 __cpu_emergency_vmxoff();
563
564
565 nmi_shootdown_cpus(vmxoff_nmi);
566 }
567}
568
569
570void __attribute__((weak)) mach_reboot_fixups(void)
571{
572}
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593static void native_machine_emergency_restart(void)
594{
595 int i;
596 int attempt = 0;
597 int orig_reboot_type = reboot_type;
598 unsigned short mode;
599
600 if (reboot_emergency)
601 emergency_vmx_disable_all();
602
603 tboot_shutdown(TB_SHUTDOWN_REBOOT);
604
605
606 mode = reboot_mode == REBOOT_WARM ? 0x1234 : 0;
607 *((unsigned short *)__va(0x472)) = mode;
608
609
610
611
612
613 if (efi_capsule_pending(NULL)) {
614 pr_info("EFI capsule is pending, forcing EFI reboot.\n");
615 reboot_type = BOOT_EFI;
616 }
617
618 for (;;) {
619
620 switch (reboot_type) {
621 case BOOT_ACPI:
622 acpi_reboot();
623 reboot_type = BOOT_KBD;
624 break;
625
626 case BOOT_KBD:
627 mach_reboot_fixups();
628
629 for (i = 0; i < 10; i++) {
630 kb_wait();
631 udelay(50);
632 outb(0xfe, 0x64);
633 udelay(50);
634 }
635 if (attempt == 0 && orig_reboot_type == BOOT_ACPI) {
636 attempt = 1;
637 reboot_type = BOOT_ACPI;
638 } else {
639 reboot_type = BOOT_EFI;
640 }
641 break;
642
643 case BOOT_EFI:
644 efi_reboot(reboot_mode, NULL);
645 reboot_type = BOOT_BIOS;
646 break;
647
648 case BOOT_BIOS:
649 machine_real_restart(MRR_BIOS);
650
651
652 reboot_type = BOOT_CF9_SAFE;
653 break;
654
655 case BOOT_CF9_FORCE:
656 port_cf9_safe = true;
657 fallthrough;
658
659 case BOOT_CF9_SAFE:
660 if (port_cf9_safe) {
661 u8 reboot_code = reboot_mode == REBOOT_WARM ? 0x06 : 0x0E;
662 u8 cf9 = inb(0xcf9) & ~reboot_code;
663 outb(cf9|2, 0xcf9);
664 udelay(50);
665
666 outb(cf9|reboot_code, 0xcf9);
667 udelay(50);
668 }
669 reboot_type = BOOT_TRIPLE;
670 break;
671
672 case BOOT_TRIPLE:
673 idt_invalidate();
674 __asm__ __volatile__("int3");
675
676
677 reboot_type = BOOT_KBD;
678 break;
679 }
680 }
681}
682
683void native_machine_shutdown(void)
684{
685
686#ifdef CONFIG_X86_IO_APIC
687
688
689
690
691
692
693
694
695
696
697
698 clear_IO_APIC();
699#endif
700
701#ifdef CONFIG_SMP
702
703
704
705
706
707 local_irq_disable();
708 stop_other_cpus();
709#endif
710
711 lapic_shutdown();
712 restore_boot_irq_mode();
713
714#ifdef CONFIG_HPET_TIMER
715 hpet_disable();
716#endif
717
718#ifdef CONFIG_X86_64
719 x86_platform.iommu_shutdown();
720#endif
721}
722
723static void __machine_emergency_restart(int emergency)
724{
725 reboot_emergency = emergency;
726 machine_ops.emergency_restart();
727}
728
729static void native_machine_restart(char *__unused)
730{
731 pr_notice("machine restart\n");
732
733 if (!reboot_force)
734 machine_shutdown();
735 __machine_emergency_restart(0);
736}
737
738static void native_machine_halt(void)
739{
740
741 machine_shutdown();
742
743 tboot_shutdown(TB_SHUTDOWN_HALT);
744
745 stop_this_cpu(NULL);
746}
747
748static void native_machine_power_off(void)
749{
750 if (pm_power_off) {
751 if (!reboot_force)
752 machine_shutdown();
753 pm_power_off();
754 }
755
756 tboot_shutdown(TB_SHUTDOWN_HALT);
757}
758
759struct machine_ops machine_ops __ro_after_init = {
760 .power_off = native_machine_power_off,
761 .shutdown = native_machine_shutdown,
762 .emergency_restart = native_machine_emergency_restart,
763 .restart = native_machine_restart,
764 .halt = native_machine_halt,
765#ifdef CONFIG_KEXEC_CORE
766 .crash_shutdown = native_machine_crash_shutdown,
767#endif
768};
769
770void machine_power_off(void)
771{
772 machine_ops.power_off();
773}
774
775void machine_shutdown(void)
776{
777 machine_ops.shutdown();
778}
779
780void machine_emergency_restart(void)
781{
782 __machine_emergency_restart(1);
783}
784
785void machine_restart(char *cmd)
786{
787 machine_ops.restart(cmd);
788}
789
790void machine_halt(void)
791{
792 machine_ops.halt();
793}
794
795#ifdef CONFIG_KEXEC_CORE
796void machine_crash_shutdown(struct pt_regs *regs)
797{
798 machine_ops.crash_shutdown(regs);
799}
800#endif
801
802
803
804int crashing_cpu = -1;
805
806#if defined(CONFIG_SMP)
807
808static nmi_shootdown_cb shootdown_callback;
809
810static atomic_t waiting_for_crash_ipi;
811static int crash_ipi_issued;
812
813static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
814{
815 int cpu;
816
817 cpu = raw_smp_processor_id();
818
819
820
821
822
823
824 if (cpu == crashing_cpu)
825 return NMI_HANDLED;
826 local_irq_disable();
827
828 shootdown_callback(cpu, regs);
829
830 atomic_dec(&waiting_for_crash_ipi);
831
832 halt();
833 for (;;)
834 cpu_relax();
835
836 return NMI_HANDLED;
837}
838
839
840
841
842
843
844
845
846void nmi_shootdown_cpus(nmi_shootdown_cb callback)
847{
848 unsigned long msecs;
849 local_irq_disable();
850
851
852 crashing_cpu = safe_smp_processor_id();
853
854 shootdown_callback = callback;
855
856 atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
857
858 if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback,
859 NMI_FLAG_FIRST, "crash"))
860 return;
861
862
863
864
865 wmb();
866
867 apic_send_IPI_allbutself(NMI_VECTOR);
868
869
870 WRITE_ONCE(crash_ipi_issued, 1);
871
872 msecs = 1000;
873 while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
874 mdelay(1);
875 msecs--;
876 }
877
878
879}
880
881
882
883
884
885
886void run_crash_ipi_callback(struct pt_regs *regs)
887{
888 if (crash_ipi_issued)
889 crash_nmi_callback(0, regs);
890}
891
892
893void nmi_panic_self_stop(struct pt_regs *regs)
894{
895 while (1) {
896
897 run_crash_ipi_callback(regs);
898 cpu_relax();
899 }
900}
901
902#else
903void nmi_shootdown_cpus(nmi_shootdown_cb callback)
904{
905
906}
907
908void run_crash_ipi_callback(struct pt_regs *regs)
909{
910}
911#endif
912