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Merge tag 'mips_fixes_4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan...
[mirror_ubuntu-focal-kernel.git] / arch / x86 / include / asm / percpu.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_PERCPU_H
3 #define _ASM_X86_PERCPU_H
4
5 #ifdef CONFIG_X86_64
6 #define __percpu_seg gs
7 #define __percpu_mov_op movq
8 #else
9 #define __percpu_seg fs
10 #define __percpu_mov_op movl
11 #endif
12
13 #ifdef __ASSEMBLY__
14
15 /*
16 * PER_CPU finds an address of a per-cpu variable.
17 *
18 * Args:
19 * var - variable name
20 * reg - 32bit register
21 *
22 * The resulting address is stored in the "reg" argument.
23 *
24 * Example:
25 * PER_CPU(cpu_gdt_descr, %ebx)
26 */
27 #ifdef CONFIG_SMP
28 #define PER_CPU(var, reg) \
29 __percpu_mov_op %__percpu_seg:this_cpu_off, reg; \
30 lea var(reg), reg
31 #define PER_CPU_VAR(var) %__percpu_seg:var
32 #else /* ! SMP */
33 #define PER_CPU(var, reg) __percpu_mov_op $var, reg
34 #define PER_CPU_VAR(var) var
35 #endif /* SMP */
36
37 #ifdef CONFIG_X86_64_SMP
38 #define INIT_PER_CPU_VAR(var) init_per_cpu__##var
39 #else
40 #define INIT_PER_CPU_VAR(var) var
41 #endif
42
43 #else /* ...!ASSEMBLY */
44
45 #include <linux/kernel.h>
46 #include <linux/stringify.h>
47
48 #ifdef CONFIG_SMP
49 #define __percpu_prefix "%%"__stringify(__percpu_seg)":"
50 #define __my_cpu_offset this_cpu_read(this_cpu_off)
51
52 /*
53 * Compared to the generic __my_cpu_offset version, the following
54 * saves one instruction and avoids clobbering a temp register.
55 */
56 #define arch_raw_cpu_ptr(ptr) \
57 ({ \
58 unsigned long tcp_ptr__; \
59 asm volatile("add " __percpu_arg(1) ", %0" \
60 : "=r" (tcp_ptr__) \
61 : "m" (this_cpu_off), "0" (ptr)); \
62 (typeof(*(ptr)) __kernel __force *)tcp_ptr__; \
63 })
64 #else
65 #define __percpu_prefix ""
66 #endif
67
68 #define __percpu_arg(x) __percpu_prefix "%" #x
69
70 /*
71 * Initialized pointers to per-cpu variables needed for the boot
72 * processor need to use these macros to get the proper address
73 * offset from __per_cpu_load on SMP.
74 *
75 * There also must be an entry in vmlinux_64.lds.S
76 */
77 #define DECLARE_INIT_PER_CPU(var) \
78 extern typeof(var) init_per_cpu_var(var)
79
80 #ifdef CONFIG_X86_64_SMP
81 #define init_per_cpu_var(var) init_per_cpu__##var
82 #else
83 #define init_per_cpu_var(var) var
84 #endif
85
86 /* For arch-specific code, we can use direct single-insn ops (they
87 * don't give an lvalue though). */
88 extern void __bad_percpu_size(void);
89
90 #define percpu_to_op(op, var, val) \
91 do { \
92 typedef typeof(var) pto_T__; \
93 if (0) { \
94 pto_T__ pto_tmp__; \
95 pto_tmp__ = (val); \
96 (void)pto_tmp__; \
97 } \
98 switch (sizeof(var)) { \
99 case 1: \
100 asm(op "b %1,"__percpu_arg(0) \
101 : "+m" (var) \
102 : "qi" ((pto_T__)(val))); \
103 break; \
104 case 2: \
105 asm(op "w %1,"__percpu_arg(0) \
106 : "+m" (var) \
107 : "ri" ((pto_T__)(val))); \
108 break; \
109 case 4: \
110 asm(op "l %1,"__percpu_arg(0) \
111 : "+m" (var) \
112 : "ri" ((pto_T__)(val))); \
113 break; \
114 case 8: \
115 asm(op "q %1,"__percpu_arg(0) \
116 : "+m" (var) \
117 : "re" ((pto_T__)(val))); \
118 break; \
119 default: __bad_percpu_size(); \
120 } \
121 } while (0)
122
123 /*
124 * Generate a percpu add to memory instruction and optimize code
125 * if one is added or subtracted.
126 */
127 #define percpu_add_op(var, val) \
128 do { \
129 typedef typeof(var) pao_T__; \
130 const int pao_ID__ = (__builtin_constant_p(val) && \
131 ((val) == 1 || (val) == -1)) ? \
132 (int)(val) : 0; \
133 if (0) { \
134 pao_T__ pao_tmp__; \
135 pao_tmp__ = (val); \
136 (void)pao_tmp__; \
137 } \
138 switch (sizeof(var)) { \
139 case 1: \
140 if (pao_ID__ == 1) \
141 asm("incb "__percpu_arg(0) : "+m" (var)); \
142 else if (pao_ID__ == -1) \
143 asm("decb "__percpu_arg(0) : "+m" (var)); \
144 else \
145 asm("addb %1, "__percpu_arg(0) \
146 : "+m" (var) \
147 : "qi" ((pao_T__)(val))); \
148 break; \
149 case 2: \
150 if (pao_ID__ == 1) \
151 asm("incw "__percpu_arg(0) : "+m" (var)); \
152 else if (pao_ID__ == -1) \
153 asm("decw "__percpu_arg(0) : "+m" (var)); \
154 else \
155 asm("addw %1, "__percpu_arg(0) \
156 : "+m" (var) \
157 : "ri" ((pao_T__)(val))); \
158 break; \
159 case 4: \
160 if (pao_ID__ == 1) \
161 asm("incl "__percpu_arg(0) : "+m" (var)); \
162 else if (pao_ID__ == -1) \
163 asm("decl "__percpu_arg(0) : "+m" (var)); \
164 else \
165 asm("addl %1, "__percpu_arg(0) \
166 : "+m" (var) \
167 : "ri" ((pao_T__)(val))); \
168 break; \
169 case 8: \
170 if (pao_ID__ == 1) \
171 asm("incq "__percpu_arg(0) : "+m" (var)); \
172 else if (pao_ID__ == -1) \
173 asm("decq "__percpu_arg(0) : "+m" (var)); \
174 else \
175 asm("addq %1, "__percpu_arg(0) \
176 : "+m" (var) \
177 : "re" ((pao_T__)(val))); \
178 break; \
179 default: __bad_percpu_size(); \
180 } \
181 } while (0)
182
183 #define percpu_from_op(op, var) \
184 ({ \
185 typeof(var) pfo_ret__; \
186 switch (sizeof(var)) { \
187 case 1: \
188 asm(op "b "__percpu_arg(1)",%0" \
189 : "=q" (pfo_ret__) \
190 : "m" (var)); \
191 break; \
192 case 2: \
193 asm(op "w "__percpu_arg(1)",%0" \
194 : "=r" (pfo_ret__) \
195 : "m" (var)); \
196 break; \
197 case 4: \
198 asm(op "l "__percpu_arg(1)",%0" \
199 : "=r" (pfo_ret__) \
200 : "m" (var)); \
201 break; \
202 case 8: \
203 asm(op "q "__percpu_arg(1)",%0" \
204 : "=r" (pfo_ret__) \
205 : "m" (var)); \
206 break; \
207 default: __bad_percpu_size(); \
208 } \
209 pfo_ret__; \
210 })
211
212 #define percpu_stable_op(op, var) \
213 ({ \
214 typeof(var) pfo_ret__; \
215 switch (sizeof(var)) { \
216 case 1: \
217 asm(op "b "__percpu_arg(P1)",%0" \
218 : "=q" (pfo_ret__) \
219 : "p" (&(var))); \
220 break; \
221 case 2: \
222 asm(op "w "__percpu_arg(P1)",%0" \
223 : "=r" (pfo_ret__) \
224 : "p" (&(var))); \
225 break; \
226 case 4: \
227 asm(op "l "__percpu_arg(P1)",%0" \
228 : "=r" (pfo_ret__) \
229 : "p" (&(var))); \
230 break; \
231 case 8: \
232 asm(op "q "__percpu_arg(P1)",%0" \
233 : "=r" (pfo_ret__) \
234 : "p" (&(var))); \
235 break; \
236 default: __bad_percpu_size(); \
237 } \
238 pfo_ret__; \
239 })
240
241 #define percpu_unary_op(op, var) \
242 ({ \
243 switch (sizeof(var)) { \
244 case 1: \
245 asm(op "b "__percpu_arg(0) \
246 : "+m" (var)); \
247 break; \
248 case 2: \
249 asm(op "w "__percpu_arg(0) \
250 : "+m" (var)); \
251 break; \
252 case 4: \
253 asm(op "l "__percpu_arg(0) \
254 : "+m" (var)); \
255 break; \
256 case 8: \
257 asm(op "q "__percpu_arg(0) \
258 : "+m" (var)); \
259 break; \
260 default: __bad_percpu_size(); \
261 } \
262 })
263
264 /*
265 * Add return operation
266 */
267 #define percpu_add_return_op(var, val) \
268 ({ \
269 typeof(var) paro_ret__ = val; \
270 switch (sizeof(var)) { \
271 case 1: \
272 asm("xaddb %0, "__percpu_arg(1) \
273 : "+q" (paro_ret__), "+m" (var) \
274 : : "memory"); \
275 break; \
276 case 2: \
277 asm("xaddw %0, "__percpu_arg(1) \
278 : "+r" (paro_ret__), "+m" (var) \
279 : : "memory"); \
280 break; \
281 case 4: \
282 asm("xaddl %0, "__percpu_arg(1) \
283 : "+r" (paro_ret__), "+m" (var) \
284 : : "memory"); \
285 break; \
286 case 8: \
287 asm("xaddq %0, "__percpu_arg(1) \
288 : "+re" (paro_ret__), "+m" (var) \
289 : : "memory"); \
290 break; \
291 default: __bad_percpu_size(); \
292 } \
293 paro_ret__ += val; \
294 paro_ret__; \
295 })
296
297 /*
298 * xchg is implemented using cmpxchg without a lock prefix. xchg is
299 * expensive due to the implied lock prefix. The processor cannot prefetch
300 * cachelines if xchg is used.
301 */
302 #define percpu_xchg_op(var, nval) \
303 ({ \
304 typeof(var) pxo_ret__; \
305 typeof(var) pxo_new__ = (nval); \
306 switch (sizeof(var)) { \
307 case 1: \
308 asm("\n\tmov "__percpu_arg(1)",%%al" \
309 "\n1:\tcmpxchgb %2, "__percpu_arg(1) \
310 "\n\tjnz 1b" \
311 : "=&a" (pxo_ret__), "+m" (var) \
312 : "q" (pxo_new__) \
313 : "memory"); \
314 break; \
315 case 2: \
316 asm("\n\tmov "__percpu_arg(1)",%%ax" \
317 "\n1:\tcmpxchgw %2, "__percpu_arg(1) \
318 "\n\tjnz 1b" \
319 : "=&a" (pxo_ret__), "+m" (var) \
320 : "r" (pxo_new__) \
321 : "memory"); \
322 break; \
323 case 4: \
324 asm("\n\tmov "__percpu_arg(1)",%%eax" \
325 "\n1:\tcmpxchgl %2, "__percpu_arg(1) \
326 "\n\tjnz 1b" \
327 : "=&a" (pxo_ret__), "+m" (var) \
328 : "r" (pxo_new__) \
329 : "memory"); \
330 break; \
331 case 8: \
332 asm("\n\tmov "__percpu_arg(1)",%%rax" \
333 "\n1:\tcmpxchgq %2, "__percpu_arg(1) \
334 "\n\tjnz 1b" \
335 : "=&a" (pxo_ret__), "+m" (var) \
336 : "r" (pxo_new__) \
337 : "memory"); \
338 break; \
339 default: __bad_percpu_size(); \
340 } \
341 pxo_ret__; \
342 })
343
344 /*
345 * cmpxchg has no such implied lock semantics as a result it is much
346 * more efficient for cpu local operations.
347 */
348 #define percpu_cmpxchg_op(var, oval, nval) \
349 ({ \
350 typeof(var) pco_ret__; \
351 typeof(var) pco_old__ = (oval); \
352 typeof(var) pco_new__ = (nval); \
353 switch (sizeof(var)) { \
354 case 1: \
355 asm("cmpxchgb %2, "__percpu_arg(1) \
356 : "=a" (pco_ret__), "+m" (var) \
357 : "q" (pco_new__), "0" (pco_old__) \
358 : "memory"); \
359 break; \
360 case 2: \
361 asm("cmpxchgw %2, "__percpu_arg(1) \
362 : "=a" (pco_ret__), "+m" (var) \
363 : "r" (pco_new__), "0" (pco_old__) \
364 : "memory"); \
365 break; \
366 case 4: \
367 asm("cmpxchgl %2, "__percpu_arg(1) \
368 : "=a" (pco_ret__), "+m" (var) \
369 : "r" (pco_new__), "0" (pco_old__) \
370 : "memory"); \
371 break; \
372 case 8: \
373 asm("cmpxchgq %2, "__percpu_arg(1) \
374 : "=a" (pco_ret__), "+m" (var) \
375 : "r" (pco_new__), "0" (pco_old__) \
376 : "memory"); \
377 break; \
378 default: __bad_percpu_size(); \
379 } \
380 pco_ret__; \
381 })
382
383 /*
384 * this_cpu_read() makes gcc load the percpu variable every time it is
385 * accessed while this_cpu_read_stable() allows the value to be cached.
386 * this_cpu_read_stable() is more efficient and can be used if its value
387 * is guaranteed to be valid across cpus. The current users include
388 * get_current() and get_thread_info() both of which are actually
389 * per-thread variables implemented as per-cpu variables and thus
390 * stable for the duration of the respective task.
391 */
392 #define this_cpu_read_stable(var) percpu_stable_op("mov", var)
393
394 #define raw_cpu_read_1(pcp) percpu_from_op("mov", pcp)
395 #define raw_cpu_read_2(pcp) percpu_from_op("mov", pcp)
396 #define raw_cpu_read_4(pcp) percpu_from_op("mov", pcp)
397
398 #define raw_cpu_write_1(pcp, val) percpu_to_op("mov", (pcp), val)
399 #define raw_cpu_write_2(pcp, val) percpu_to_op("mov", (pcp), val)
400 #define raw_cpu_write_4(pcp, val) percpu_to_op("mov", (pcp), val)
401 #define raw_cpu_add_1(pcp, val) percpu_add_op((pcp), val)
402 #define raw_cpu_add_2(pcp, val) percpu_add_op((pcp), val)
403 #define raw_cpu_add_4(pcp, val) percpu_add_op((pcp), val)
404 #define raw_cpu_and_1(pcp, val) percpu_to_op("and", (pcp), val)
405 #define raw_cpu_and_2(pcp, val) percpu_to_op("and", (pcp), val)
406 #define raw_cpu_and_4(pcp, val) percpu_to_op("and", (pcp), val)
407 #define raw_cpu_or_1(pcp, val) percpu_to_op("or", (pcp), val)
408 #define raw_cpu_or_2(pcp, val) percpu_to_op("or", (pcp), val)
409 #define raw_cpu_or_4(pcp, val) percpu_to_op("or", (pcp), val)
410 #define raw_cpu_xchg_1(pcp, val) percpu_xchg_op(pcp, val)
411 #define raw_cpu_xchg_2(pcp, val) percpu_xchg_op(pcp, val)
412 #define raw_cpu_xchg_4(pcp, val) percpu_xchg_op(pcp, val)
413
414 #define this_cpu_read_1(pcp) percpu_from_op("mov", pcp)
415 #define this_cpu_read_2(pcp) percpu_from_op("mov", pcp)
416 #define this_cpu_read_4(pcp) percpu_from_op("mov", pcp)
417 #define this_cpu_write_1(pcp, val) percpu_to_op("mov", (pcp), val)
418 #define this_cpu_write_2(pcp, val) percpu_to_op("mov", (pcp), val)
419 #define this_cpu_write_4(pcp, val) percpu_to_op("mov", (pcp), val)
420 #define this_cpu_add_1(pcp, val) percpu_add_op((pcp), val)
421 #define this_cpu_add_2(pcp, val) percpu_add_op((pcp), val)
422 #define this_cpu_add_4(pcp, val) percpu_add_op((pcp), val)
423 #define this_cpu_and_1(pcp, val) percpu_to_op("and", (pcp), val)
424 #define this_cpu_and_2(pcp, val) percpu_to_op("and", (pcp), val)
425 #define this_cpu_and_4(pcp, val) percpu_to_op("and", (pcp), val)
426 #define this_cpu_or_1(pcp, val) percpu_to_op("or", (pcp), val)
427 #define this_cpu_or_2(pcp, val) percpu_to_op("or", (pcp), val)
428 #define this_cpu_or_4(pcp, val) percpu_to_op("or", (pcp), val)
429 #define this_cpu_xchg_1(pcp, nval) percpu_xchg_op(pcp, nval)
430 #define this_cpu_xchg_2(pcp, nval) percpu_xchg_op(pcp, nval)
431 #define this_cpu_xchg_4(pcp, nval) percpu_xchg_op(pcp, nval)
432
433 #define raw_cpu_add_return_1(pcp, val) percpu_add_return_op(pcp, val)
434 #define raw_cpu_add_return_2(pcp, val) percpu_add_return_op(pcp, val)
435 #define raw_cpu_add_return_4(pcp, val) percpu_add_return_op(pcp, val)
436 #define raw_cpu_cmpxchg_1(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
437 #define raw_cpu_cmpxchg_2(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
438 #define raw_cpu_cmpxchg_4(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
439
440 #define this_cpu_add_return_1(pcp, val) percpu_add_return_op(pcp, val)
441 #define this_cpu_add_return_2(pcp, val) percpu_add_return_op(pcp, val)
442 #define this_cpu_add_return_4(pcp, val) percpu_add_return_op(pcp, val)
443 #define this_cpu_cmpxchg_1(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
444 #define this_cpu_cmpxchg_2(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
445 #define this_cpu_cmpxchg_4(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
446
447 #ifdef CONFIG_X86_CMPXCHG64
448 #define percpu_cmpxchg8b_double(pcp1, pcp2, o1, o2, n1, n2) \
449 ({ \
450 bool __ret; \
451 typeof(pcp1) __o1 = (o1), __n1 = (n1); \
452 typeof(pcp2) __o2 = (o2), __n2 = (n2); \
453 asm volatile("cmpxchg8b "__percpu_arg(1)"\n\tsetz %0\n\t" \
454 : "=a" (__ret), "+m" (pcp1), "+m" (pcp2), "+d" (__o2) \
455 : "b" (__n1), "c" (__n2), "a" (__o1)); \
456 __ret; \
457 })
458
459 #define raw_cpu_cmpxchg_double_4 percpu_cmpxchg8b_double
460 #define this_cpu_cmpxchg_double_4 percpu_cmpxchg8b_double
461 #endif /* CONFIG_X86_CMPXCHG64 */
462
463 /*
464 * Per cpu atomic 64 bit operations are only available under 64 bit.
465 * 32 bit must fall back to generic operations.
466 */
467 #ifdef CONFIG_X86_64
468 #define raw_cpu_read_8(pcp) percpu_from_op("mov", pcp)
469 #define raw_cpu_write_8(pcp, val) percpu_to_op("mov", (pcp), val)
470 #define raw_cpu_add_8(pcp, val) percpu_add_op((pcp), val)
471 #define raw_cpu_and_8(pcp, val) percpu_to_op("and", (pcp), val)
472 #define raw_cpu_or_8(pcp, val) percpu_to_op("or", (pcp), val)
473 #define raw_cpu_add_return_8(pcp, val) percpu_add_return_op(pcp, val)
474 #define raw_cpu_xchg_8(pcp, nval) percpu_xchg_op(pcp, nval)
475 #define raw_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
476
477 #define this_cpu_read_8(pcp) percpu_from_op("mov", pcp)
478 #define this_cpu_write_8(pcp, val) percpu_to_op("mov", (pcp), val)
479 #define this_cpu_add_8(pcp, val) percpu_add_op((pcp), val)
480 #define this_cpu_and_8(pcp, val) percpu_to_op("and", (pcp), val)
481 #define this_cpu_or_8(pcp, val) percpu_to_op("or", (pcp), val)
482 #define this_cpu_add_return_8(pcp, val) percpu_add_return_op(pcp, val)
483 #define this_cpu_xchg_8(pcp, nval) percpu_xchg_op(pcp, nval)
484 #define this_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
485
486 /*
487 * Pretty complex macro to generate cmpxchg16 instruction. The instruction
488 * is not supported on early AMD64 processors so we must be able to emulate
489 * it in software. The address used in the cmpxchg16 instruction must be
490 * aligned to a 16 byte boundary.
491 */
492 #define percpu_cmpxchg16b_double(pcp1, pcp2, o1, o2, n1, n2) \
493 ({ \
494 bool __ret; \
495 typeof(pcp1) __o1 = (o1), __n1 = (n1); \
496 typeof(pcp2) __o2 = (o2), __n2 = (n2); \
497 alternative_io("leaq %P1,%%rsi\n\tcall this_cpu_cmpxchg16b_emu\n\t", \
498 "cmpxchg16b " __percpu_arg(1) "\n\tsetz %0\n\t", \
499 X86_FEATURE_CX16, \
500 ASM_OUTPUT2("=a" (__ret), "+m" (pcp1), \
501 "+m" (pcp2), "+d" (__o2)), \
502 "b" (__n1), "c" (__n2), "a" (__o1) : "rsi"); \
503 __ret; \
504 })
505
506 #define raw_cpu_cmpxchg_double_8 percpu_cmpxchg16b_double
507 #define this_cpu_cmpxchg_double_8 percpu_cmpxchg16b_double
508
509 #endif
510
511 static __always_inline bool x86_this_cpu_constant_test_bit(unsigned int nr,
512 const unsigned long __percpu *addr)
513 {
514 unsigned long __percpu *a =
515 (unsigned long __percpu *)addr + nr / BITS_PER_LONG;
516
517 #ifdef CONFIG_X86_64
518 return ((1UL << (nr % BITS_PER_LONG)) & raw_cpu_read_8(*a)) != 0;
519 #else
520 return ((1UL << (nr % BITS_PER_LONG)) & raw_cpu_read_4(*a)) != 0;
521 #endif
522 }
523
524 static inline bool x86_this_cpu_variable_test_bit(int nr,
525 const unsigned long __percpu *addr)
526 {
527 bool oldbit;
528
529 asm volatile("bt "__percpu_arg(2)",%1\n\t"
530 CC_SET(c)
531 : CC_OUT(c) (oldbit)
532 : "m" (*(unsigned long __percpu *)addr), "Ir" (nr));
533
534 return oldbit;
535 }
536
537 #define x86_this_cpu_test_bit(nr, addr) \
538 (__builtin_constant_p((nr)) \
539 ? x86_this_cpu_constant_test_bit((nr), (addr)) \
540 : x86_this_cpu_variable_test_bit((nr), (addr)))
541
542
543 #include <asm-generic/percpu.h>
544
545 /* We can use this directly for local CPU (faster). */
546 DECLARE_PER_CPU_READ_MOSTLY(unsigned long, this_cpu_off);
547
548 #endif /* !__ASSEMBLY__ */
549
550 #ifdef CONFIG_SMP
551
552 /*
553 * Define the "EARLY_PER_CPU" macros. These are used for some per_cpu
554 * variables that are initialized and accessed before there are per_cpu
555 * areas allocated.
556 */
557
558 #define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \
559 DEFINE_PER_CPU(_type, _name) = _initvalue; \
560 __typeof__(_type) _name##_early_map[NR_CPUS] __initdata = \
561 { [0 ... NR_CPUS-1] = _initvalue }; \
562 __typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map
563
564 #define DEFINE_EARLY_PER_CPU_READ_MOSTLY(_type, _name, _initvalue) \
565 DEFINE_PER_CPU_READ_MOSTLY(_type, _name) = _initvalue; \
566 __typeof__(_type) _name##_early_map[NR_CPUS] __initdata = \
567 { [0 ... NR_CPUS-1] = _initvalue }; \
568 __typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map
569
570 #define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \
571 EXPORT_PER_CPU_SYMBOL(_name)
572
573 #define DECLARE_EARLY_PER_CPU(_type, _name) \
574 DECLARE_PER_CPU(_type, _name); \
575 extern __typeof__(_type) *_name##_early_ptr; \
576 extern __typeof__(_type) _name##_early_map[]
577
578 #define DECLARE_EARLY_PER_CPU_READ_MOSTLY(_type, _name) \
579 DECLARE_PER_CPU_READ_MOSTLY(_type, _name); \
580 extern __typeof__(_type) *_name##_early_ptr; \
581 extern __typeof__(_type) _name##_early_map[]
582
583 #define early_per_cpu_ptr(_name) (_name##_early_ptr)
584 #define early_per_cpu_map(_name, _idx) (_name##_early_map[_idx])
585 #define early_per_cpu(_name, _cpu) \
586 *(early_per_cpu_ptr(_name) ? \
587 &early_per_cpu_ptr(_name)[_cpu] : \
588 &per_cpu(_name, _cpu))
589
590 #else /* !CONFIG_SMP */
591 #define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \
592 DEFINE_PER_CPU(_type, _name) = _initvalue
593
594 #define DEFINE_EARLY_PER_CPU_READ_MOSTLY(_type, _name, _initvalue) \
595 DEFINE_PER_CPU_READ_MOSTLY(_type, _name) = _initvalue
596
597 #define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \
598 EXPORT_PER_CPU_SYMBOL(_name)
599
600 #define DECLARE_EARLY_PER_CPU(_type, _name) \
601 DECLARE_PER_CPU(_type, _name)
602
603 #define DECLARE_EARLY_PER_CPU_READ_MOSTLY(_type, _name) \
604 DECLARE_PER_CPU_READ_MOSTLY(_type, _name)
605
606 #define early_per_cpu(_name, _cpu) per_cpu(_name, _cpu)
607 #define early_per_cpu_ptr(_name) NULL
608 /* no early_per_cpu_map() */
609
610 #endif /* !CONFIG_SMP */
611
612 #endif /* _ASM_X86_PERCPU_H */
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