Commit | Line | Data |
---|---|---|
ab14de6c HC |
1 | /* |
2 | * arch/s390/kernel/early.c | |
3 | * | |
155af2f9 | 4 | * Copyright IBM Corp. 2007, 2009 |
ab14de6c HC |
5 | * Author(s): Hongjie Yang <hongjie@us.ibm.com>, |
6 | * Heiko Carstens <heiko.carstens@de.ibm.com> | |
7 | */ | |
8 | ||
11af97e1 HB |
9 | #define KMSG_COMPONENT "setup" |
10 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
11 | ||
92e6ecf3 | 12 | #include <linux/compiler.h> |
ab14de6c HC |
13 | #include <linux/init.h> |
14 | #include <linux/errno.h> | |
15 | #include <linux/string.h> | |
16 | #include <linux/ctype.h> | |
dfd9f7ab | 17 | #include <linux/ftrace.h> |
ab14de6c HC |
18 | #include <linux/lockdep.h> |
19 | #include <linux/module.h> | |
20 | #include <linux/pfn.h> | |
21 | #include <linux/uaccess.h> | |
11af97e1 | 22 | #include <linux/kernel.h> |
a0443fbb | 23 | #include <asm/ebcdic.h> |
46b05d26 | 24 | #include <asm/ipl.h> |
ab14de6c HC |
25 | #include <asm/lowcore.h> |
26 | #include <asm/processor.h> | |
27 | #include <asm/sections.h> | |
28 | #include <asm/setup.h> | |
92e6ecf3 | 29 | #include <asm/sysinfo.h> |
ab14de6c HC |
30 | #include <asm/cpcmd.h> |
31 | #include <asm/sclp.h> | |
a806170e | 32 | #include "entry.h" |
ab14de6c HC |
33 | |
34 | /* | |
35 | * Create a Kernel NSS if the SAVESYS= parameter is defined | |
36 | */ | |
a0443fbb | 37 | #define DEFSYS_CMD_SIZE 128 |
ab14de6c HC |
38 | #define SAVESYS_CMD_SIZE 32 |
39 | ||
ab14de6c HC |
40 | char kernel_nss_name[NSS_NAME_SIZE + 1]; |
41 | ||
a0443fbb HB |
42 | static void __init setup_boot_command_line(void); |
43 | ||
b6112ccb MS |
44 | /* |
45 | * Get the TOD clock running. | |
46 | */ | |
47 | static void __init reset_tod_clock(void) | |
48 | { | |
49 | u64 time; | |
50 | ||
51 | if (store_clock(&time) == 0) | |
52 | return; | |
53 | /* TOD clock not running. Set the clock to Unix Epoch. */ | |
54 | if (set_clock(TOD_UNIX_EPOCH) != 0 || store_clock(&time) != 0) | |
55 | disabled_wait(0); | |
56 | ||
57 | sched_clock_base_cc = TOD_UNIX_EPOCH; | |
b89031e0 | 58 | S390_lowcore.last_update_clock = sched_clock_base_cc; |
b6112ccb | 59 | } |
a0443fbb | 60 | |
ab14de6c | 61 | #ifdef CONFIG_SHARED_KERNEL |
a0443fbb HB |
62 | int __init savesys_ipl_nss(char *cmd, const int cmdlen); |
63 | ||
64 | asm( | |
65 | " .section .init.text,\"ax\",@progbits\n" | |
66 | " .align 4\n" | |
67 | " .type savesys_ipl_nss, @function\n" | |
68 | "savesys_ipl_nss:\n" | |
69 | #ifdef CONFIG_64BIT | |
70 | " stmg 6,15,48(15)\n" | |
71 | " lgr 14,3\n" | |
72 | " sam31\n" | |
73 | " diag 2,14,0x8\n" | |
74 | " sam64\n" | |
75 | " lgr 2,14\n" | |
76 | " lmg 6,15,48(15)\n" | |
77 | #else | |
78 | " stm 6,15,24(15)\n" | |
79 | " lr 14,3\n" | |
80 | " diag 2,14,0x8\n" | |
81 | " lr 2,14\n" | |
82 | " lm 6,15,24(15)\n" | |
83 | #endif | |
84 | " br 14\n" | |
18764463 HC |
85 | " .size savesys_ipl_nss, .-savesys_ipl_nss\n" |
86 | " .previous\n"); | |
a0443fbb | 87 | |
684d2fd4 HB |
88 | static __initdata char upper_command_line[COMMAND_LINE_SIZE]; |
89 | ||
ab14de6c HC |
90 | static noinline __init void create_kernel_nss(void) |
91 | { | |
92 | unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size; | |
93 | #ifdef CONFIG_BLK_DEV_INITRD | |
94 | unsigned int sinitrd_pfn, einitrd_pfn; | |
95 | #endif | |
96 | int response; | |
69ac43b0 | 97 | int hlen; |
a0443fbb | 98 | size_t len; |
ab14de6c | 99 | char *savesys_ptr; |
ab14de6c HC |
100 | char defsys_cmd[DEFSYS_CMD_SIZE]; |
101 | char savesys_cmd[SAVESYS_CMD_SIZE]; | |
102 | ||
103 | /* Do nothing if we are not running under VM */ | |
104 | if (!MACHINE_IS_VM) | |
105 | return; | |
106 | ||
107 | /* Convert COMMAND_LINE to upper case */ | |
a0443fbb HB |
108 | for (i = 0; i < strlen(boot_command_line); i++) |
109 | upper_command_line[i] = toupper(boot_command_line[i]); | |
ab14de6c HC |
110 | |
111 | savesys_ptr = strstr(upper_command_line, "SAVESYS="); | |
112 | ||
113 | if (!savesys_ptr) | |
114 | return; | |
115 | ||
116 | savesys_ptr += 8; /* Point to the beginning of the NSS name */ | |
117 | for (i = 0; i < NSS_NAME_SIZE; i++) { | |
118 | if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0') | |
119 | break; | |
120 | kernel_nss_name[i] = savesys_ptr[i]; | |
121 | } | |
122 | ||
123 | stext_pfn = PFN_DOWN(__pa(&_stext)); | |
124 | eshared_pfn = PFN_DOWN(__pa(&_eshared)); | |
125 | end_pfn = PFN_UP(__pa(&_end)); | |
126 | min_size = end_pfn << 2; | |
127 | ||
69ac43b0 CL |
128 | hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE, |
129 | "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X", | |
130 | kernel_nss_name, stext_pfn - 1, stext_pfn, | |
131 | eshared_pfn - 1, eshared_pfn, end_pfn); | |
ab14de6c HC |
132 | |
133 | #ifdef CONFIG_BLK_DEV_INITRD | |
134 | if (INITRD_START && INITRD_SIZE) { | |
135 | sinitrd_pfn = PFN_DOWN(__pa(INITRD_START)); | |
136 | einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE)); | |
137 | min_size = einitrd_pfn << 2; | |
69ac43b0 CL |
138 | hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen, |
139 | " EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn); | |
ab14de6c HC |
140 | } |
141 | #endif | |
142 | ||
69ac43b0 CL |
143 | snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen, |
144 | " EW MINSIZE=%.7iK PARMREGS=0-13", min_size); | |
145 | defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0'; | |
894e491e HC |
146 | snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s", |
147 | kernel_nss_name, kernel_nss_name); | |
148 | savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0'; | |
ab14de6c HC |
149 | |
150 | __cpcmd(defsys_cmd, NULL, 0, &response); | |
151 | ||
583b33bc | 152 | if (response != 0) { |
11af97e1 HB |
153 | pr_err("Defining the Linux kernel NSS failed with rc=%d\n", |
154 | response); | |
583b33bc | 155 | kernel_nss_name[0] = '\0'; |
ab14de6c | 156 | return; |
583b33bc | 157 | } |
ab14de6c | 158 | |
a0443fbb HB |
159 | len = strlen(savesys_cmd); |
160 | ASCEBC(savesys_cmd, len); | |
161 | response = savesys_ipl_nss(savesys_cmd, len); | |
ab14de6c | 162 | |
a0443fbb HB |
163 | /* On success: response is equal to the command size, |
164 | * max SAVESYS_CMD_SIZE | |
165 | * On error: response contains the numeric portion of cp error message. | |
166 | * for SAVESYS it will be >= 263 | |
11af97e1 | 167 | * for missing privilege class, it will be 1 |
a0443fbb | 168 | */ |
11af97e1 HB |
169 | if (response > SAVESYS_CMD_SIZE || response == 1) { |
170 | pr_err("Saving the Linux kernel NSS failed with rc=%d\n", | |
171 | response); | |
583b33bc | 172 | kernel_nss_name[0] = '\0'; |
ab14de6c | 173 | return; |
583b33bc | 174 | } |
ab14de6c | 175 | |
b89031e0 MS |
176 | /* re-initialize cputime accounting. */ |
177 | sched_clock_base_cc = get_clock(); | |
178 | S390_lowcore.last_update_clock = sched_clock_base_cc; | |
179 | S390_lowcore.last_update_timer = 0x7fffffffffffffffULL; | |
180 | S390_lowcore.user_timer = 0; | |
181 | S390_lowcore.system_timer = 0; | |
182 | asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer)); | |
183 | ||
a0443fbb HB |
184 | /* re-setup boot command line with new ipl vm parms */ |
185 | ipl_update_parameters(); | |
186 | setup_boot_command_line(); | |
187 | ||
ab14de6c HC |
188 | ipl_flags = IPL_NSS_VALID; |
189 | } | |
190 | ||
191 | #else /* CONFIG_SHARED_KERNEL */ | |
192 | ||
193 | static inline void create_kernel_nss(void) { } | |
194 | ||
195 | #endif /* CONFIG_SHARED_KERNEL */ | |
196 | ||
197 | /* | |
198 | * Clear bss memory | |
199 | */ | |
200 | static noinline __init void clear_bss_section(void) | |
201 | { | |
229d9c6d | 202 | memset(__bss_start, 0, __bss_stop - __bss_start); |
ab14de6c HC |
203 | } |
204 | ||
205 | /* | |
206 | * Initialize storage key for kernel pages | |
207 | */ | |
208 | static noinline __init void init_kernel_storage_key(void) | |
209 | { | |
210 | unsigned long end_pfn, init_pfn; | |
211 | ||
212 | end_pfn = PFN_UP(__pa(&_end)); | |
213 | ||
214 | for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) | |
e2b8d7af MS |
215 | page_set_storage_key(init_pfn << PAGE_SHIFT, |
216 | PAGE_DEFAULT_KEY, 0); | |
ab14de6c HC |
217 | } |
218 | ||
92e6ecf3 CB |
219 | static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE); |
220 | ||
ab14de6c HC |
221 | static noinline __init void detect_machine_type(void) |
222 | { | |
27d71602 MS |
223 | /* Check current-configuration-level */ |
224 | if ((stsi(NULL, 0, 0, 0) >> 28) <= 2) { | |
225 | S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR; | |
92e6ecf3 | 226 | return; |
27d71602 MS |
227 | } |
228 | /* Get virtual-machine cpu information. */ | |
229 | if (stsi(&vmms, 3, 2, 2) == -ENOSYS || !vmms.count) | |
92e6ecf3 | 230 | return; |
ab14de6c | 231 | |
92e6ecf3 CB |
232 | /* Running under KVM? If not we assume z/VM */ |
233 | if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3)) | |
d3135e0c | 234 | S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; |
92e6ecf3 | 235 | else |
d3135e0c | 236 | S390_lowcore.machine_flags |= MACHINE_FLAG_VM; |
ab14de6c HC |
237 | } |
238 | ||
5f954c34 | 239 | static __init void early_pgm_check_handler(void) |
ab14de6c HC |
240 | { |
241 | unsigned long addr; | |
242 | const struct exception_table_entry *fixup; | |
243 | ||
244 | addr = S390_lowcore.program_old_psw.addr; | |
245 | fixup = search_exception_tables(addr & PSW_ADDR_INSN); | |
246 | if (!fixup) | |
247 | disabled_wait(0); | |
248 | S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE; | |
249 | } | |
250 | ||
5f954c34 | 251 | static noinline __init void setup_lowcore_early(void) |
ab14de6c HC |
252 | { |
253 | psw_t psw; | |
254 | ||
255 | psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; | |
256 | psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler; | |
257 | S390_lowcore.external_new_psw = psw; | |
258 | psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler; | |
259 | S390_lowcore.program_new_psw = psw; | |
260 | s390_base_pgm_handler_fn = early_pgm_check_handler; | |
261 | } | |
262 | ||
14375bc4 MS |
263 | static noinline __init void setup_facility_list(void) |
264 | { | |
265 | unsigned long nr; | |
266 | ||
267 | S390_lowcore.stfl_fac_list = 0; | |
268 | asm volatile( | |
269 | " .insn s,0xb2b10000,0(0)\n" /* stfl */ | |
270 | "0:\n" | |
271 | EX_TABLE(0b,0b) : "=m" (S390_lowcore.stfl_fac_list)); | |
272 | memcpy(&S390_lowcore.stfle_fac_list, &S390_lowcore.stfl_fac_list, 4); | |
273 | nr = 4; /* # bytes stored by stfl */ | |
274 | if (test_facility(7)) { | |
275 | /* More facility bits available with stfle */ | |
276 | register unsigned long reg0 asm("0") = MAX_FACILITY_BIT/64 - 1; | |
277 | asm volatile(".insn s,0xb2b00000,%0" /* stfle */ | |
278 | : "=m" (S390_lowcore.stfle_fac_list), "+d" (reg0) | |
279 | : : "cc"); | |
280 | nr = (reg0 + 1) * 8; /* # bytes stored by stfle */ | |
281 | } | |
282 | memset((char *) S390_lowcore.stfle_fac_list + nr, 0, | |
283 | MAX_FACILITY_BIT/8 - nr); | |
284 | } | |
285 | ||
53492b1d GS |
286 | static noinline __init void setup_hpage(void) |
287 | { | |
288 | #ifndef CONFIG_DEBUG_PAGEALLOC | |
14375bc4 | 289 | if (!test_facility(2) || !test_facility(8)) |
53492b1d | 290 | return; |
d3135e0c | 291 | S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE; |
53492b1d GS |
292 | __ctl_set_bit(0, 23); |
293 | #endif | |
294 | } | |
295 | ||
2e5061e4 HC |
296 | static __init void detect_mvpg(void) |
297 | { | |
298 | #ifndef CONFIG_64BIT | |
299 | int rc; | |
300 | ||
301 | asm volatile( | |
302 | " la 0,0\n" | |
303 | " mvpg %2,%2\n" | |
304 | "0: la %0,0\n" | |
305 | "1:\n" | |
306 | EX_TABLE(0b,1b) | |
307 | : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0"); | |
308 | if (!rc) | |
d3135e0c | 309 | S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG; |
2e5061e4 HC |
310 | #endif |
311 | } | |
312 | ||
313 | static __init void detect_ieee(void) | |
314 | { | |
315 | #ifndef CONFIG_64BIT | |
316 | int rc, tmp; | |
317 | ||
318 | asm volatile( | |
319 | " efpc %1,0\n" | |
320 | "0: la %0,0\n" | |
321 | "1:\n" | |
322 | EX_TABLE(0b,1b) | |
323 | : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc"); | |
324 | if (!rc) | |
d3135e0c | 325 | S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE; |
2e5061e4 HC |
326 | #endif |
327 | } | |
328 | ||
329 | static __init void detect_csp(void) | |
330 | { | |
331 | #ifndef CONFIG_64BIT | |
332 | int rc; | |
333 | ||
334 | asm volatile( | |
335 | " la 0,0\n" | |
336 | " la 1,0\n" | |
337 | " la 2,4\n" | |
338 | " csp 0,2\n" | |
339 | "0: la %0,0\n" | |
340 | "1:\n" | |
341 | EX_TABLE(0b,1b) | |
342 | : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2"); | |
343 | if (!rc) | |
d3135e0c | 344 | S390_lowcore.machine_flags |= MACHINE_FLAG_CSP; |
2e5061e4 HC |
345 | #endif |
346 | } | |
347 | ||
348 | static __init void detect_diag9c(void) | |
349 | { | |
350 | unsigned int cpu_address; | |
351 | int rc; | |
352 | ||
353 | cpu_address = stap(); | |
354 | asm volatile( | |
355 | " diag %2,0,0x9c\n" | |
356 | "0: la %0,0\n" | |
357 | "1:\n" | |
358 | EX_TABLE(0b,1b) | |
359 | : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); | |
360 | if (!rc) | |
d3135e0c | 361 | S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C; |
2e5061e4 HC |
362 | } |
363 | ||
364 | static __init void detect_diag44(void) | |
365 | { | |
366 | #ifdef CONFIG_64BIT | |
367 | int rc; | |
368 | ||
369 | asm volatile( | |
370 | " diag 0,0,0x44\n" | |
371 | "0: la %0,0\n" | |
372 | "1:\n" | |
373 | EX_TABLE(0b,1b) | |
374 | : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc"); | |
375 | if (!rc) | |
d3135e0c | 376 | S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44; |
2e5061e4 HC |
377 | #endif |
378 | } | |
379 | ||
380 | static __init void detect_machine_facilities(void) | |
381 | { | |
382 | #ifdef CONFIG_64BIT | |
14375bc4 | 383 | if (test_facility(3)) |
d3135e0c | 384 | S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; |
14375bc4 | 385 | if (test_facility(8)) |
d3135e0c | 386 | S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF; |
9186d7a9 HC |
387 | if (test_facility(11)) |
388 | S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY; | |
14375bc4 | 389 | if (test_facility(27)) |
d3135e0c | 390 | S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS; |
14375bc4 | 391 | if (test_facility(40)) |
cd3b70f5 | 392 | S390_lowcore.machine_flags |= MACHINE_FLAG_SPP; |
2e5061e4 HC |
393 | #endif |
394 | } | |
395 | ||
761cdf6a HC |
396 | static __init void rescue_initrd(void) |
397 | { | |
398 | #ifdef CONFIG_BLK_DEV_INITRD | |
399 | /* | |
400 | * Move the initrd right behind the bss section in case it starts | |
401 | * within the bss section. So we don't overwrite it when the bss | |
402 | * section gets cleared. | |
403 | */ | |
404 | if (!INITRD_START || !INITRD_SIZE) | |
405 | return; | |
406 | if (INITRD_START >= (unsigned long) __bss_stop) | |
407 | return; | |
408 | memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE); | |
409 | INITRD_START = (unsigned long) __bss_stop; | |
410 | #endif | |
411 | } | |
412 | ||
a0443fbb | 413 | /* Set up boot command line */ |
684d2fd4 | 414 | static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t)) |
a0443fbb | 415 | { |
684d2fd4 HB |
416 | char *parm, *delim; |
417 | size_t rc, len; | |
418 | ||
419 | len = strlen(boot_command_line); | |
a0443fbb | 420 | |
684d2fd4 HB |
421 | delim = boot_command_line + len; /* '\0' character position */ |
422 | parm = boot_command_line + len + 1; /* append right after '\0' */ | |
423 | ||
424 | rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1); | |
425 | if (rc) { | |
426 | if (*parm == '=') | |
427 | memmove(boot_command_line, parm + 1, rc); | |
428 | else | |
429 | *delim = ' '; /* replace '\0' with space */ | |
430 | } | |
431 | } | |
432 | ||
433 | static void __init setup_boot_command_line(void) | |
434 | { | |
61fd330d MS |
435 | int i; |
436 | ||
437 | /* convert arch command line to ascii */ | |
438 | for (i = 0; i < ARCH_COMMAND_LINE_SIZE; i++) | |
439 | if (COMMAND_LINE[i] & 0x80) | |
440 | break; | |
441 | if (i < ARCH_COMMAND_LINE_SIZE) | |
442 | EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE); | |
443 | COMMAND_LINE[ARCH_COMMAND_LINE_SIZE-1] = 0; | |
444 | ||
a0443fbb | 445 | /* copy arch command line */ |
61fd330d MS |
446 | strlcpy(boot_command_line, strstrip(COMMAND_LINE), |
447 | ARCH_COMMAND_LINE_SIZE); | |
a0443fbb HB |
448 | |
449 | /* append IPL PARM data to the boot command line */ | |
684d2fd4 HB |
450 | if (MACHINE_IS_VM) |
451 | append_to_cmdline(append_ipl_vmparm); | |
452 | ||
453 | append_to_cmdline(append_ipl_scpdata); | |
a0443fbb HB |
454 | } |
455 | ||
456 | ||
ab14de6c HC |
457 | /* |
458 | * Save ipl parameters, clear bss memory, initialize storage keys | |
459 | * and create a kernel NSS at startup if the SAVESYS= parm is defined | |
460 | */ | |
461 | void __init startup_init(void) | |
462 | { | |
b6112ccb | 463 | reset_tod_clock(); |
ab14de6c | 464 | ipl_save_parameters(); |
761cdf6a | 465 | rescue_initrd(); |
ab14de6c HC |
466 | clear_bss_section(); |
467 | init_kernel_storage_key(); | |
468 | lockdep_init(); | |
469 | lockdep_off(); | |
ab14de6c HC |
470 | sort_main_extable(); |
471 | setup_lowcore_early(); | |
14375bc4 | 472 | setup_facility_list(); |
a0443fbb HB |
473 | detect_machine_type(); |
474 | ipl_update_parameters(); | |
475 | setup_boot_command_line(); | |
476 | create_kernel_nss(); | |
2e5061e4 HC |
477 | detect_mvpg(); |
478 | detect_ieee(); | |
479 | detect_csp(); | |
480 | detect_diag9c(); | |
481 | detect_diag44(); | |
482 | detect_machine_facilities(); | |
53492b1d | 483 | setup_hpage(); |
83119ad4 | 484 | sclp_facilities_detect(); |
23d17421 | 485 | detect_memory_layout(memory_chunk); |
dfd9f7ab HC |
486 | #ifdef CONFIG_DYNAMIC_FTRACE |
487 | S390_lowcore.ftrace_func = (unsigned long)ftrace_caller; | |
488 | #endif | |
ab14de6c HC |
489 | lockdep_on(); |
490 | } |