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Merge branch 'for-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / x86 / include / asm / percpu.h
blob7a11910a63c4d4857a5a951ebb56eaeb31599092
1 #ifndef _ASM_X86_PERCPU_H
2 #define _ASM_X86_PERCPU_H
3
4 #ifdef CONFIG_X86_64
5 #define __percpu_seg gs
6 #define __percpu_mov_op movq
7 #else
8 #define __percpu_seg fs
9 #define __percpu_mov_op movl
10 #endif
11
12 #ifdef __ASSEMBLY__
13
14 /*
15 * PER_CPU finds an address of a per-cpu variable.
16 *
17 * Args:
18 * var - variable name
19 * reg - 32bit register
20 *
21 * The resulting address is stored in the "reg" argument.
22 *
23 * Example:
24 * PER_CPU(cpu_gdt_descr, %ebx)
25 */
26 #ifdef CONFIG_SMP
27 #define PER_CPU(var, reg) \
28 __percpu_mov_op %__percpu_seg:this_cpu_off, reg; \
29 lea var(reg), reg
30 #define PER_CPU_VAR(var) %__percpu_seg:var
31 #else /* ! SMP */
32 #define PER_CPU(var, reg) __percpu_mov_op $var, reg
33 #define PER_CPU_VAR(var) var
34 #endif /* SMP */
35
36 #ifdef CONFIG_X86_64_SMP
37 #define INIT_PER_CPU_VAR(var) init_per_cpu__##var
38 #else
39 #define INIT_PER_CPU_VAR(var) var
40 #endif
41
42 #else /* ...!ASSEMBLY */
43
44 #include <linux/kernel.h>
45 #include <linux/stringify.h>
46
47 #ifdef CONFIG_SMP
48 #define __percpu_prefix "%%"__stringify(__percpu_seg)":"
49 #define __my_cpu_offset percpu_read(this_cpu_off)
50
51 /*
52 * Compared to the generic __my_cpu_offset version, the following
53 * saves one instruction and avoids clobbering a temp register.
54 */
55 #define __this_cpu_ptr(ptr) \
56 ({ \
57 unsigned long tcp_ptr__; \
58 __verify_pcpu_ptr(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 "%P" #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)) ? (val) : 0; \
132 if (0) { \
133 pao_T__ pao_tmp__; \
134 pao_tmp__ = (val); \
135 (void)pao_tmp__; \
136 } \
137 switch (sizeof(var)) { \
138 case 1: \
139 if (pao_ID__ == 1) \
140 asm("incb "__percpu_arg(0) : "+m" (var)); \
141 else if (pao_ID__ == -1) \
142 asm("decb "__percpu_arg(0) : "+m" (var)); \
143 else \
144 asm("addb %1, "__percpu_arg(0) \
145 : "+m" (var) \
146 : "qi" ((pao_T__)(val))); \
147 break; \
148 case 2: \
149 if (pao_ID__ == 1) \
150 asm("incw "__percpu_arg(0) : "+m" (var)); \
151 else if (pao_ID__ == -1) \
152 asm("decw "__percpu_arg(0) : "+m" (var)); \
153 else \
154 asm("addw %1, "__percpu_arg(0) \
155 : "+m" (var) \
156 : "ri" ((pao_T__)(val))); \
157 break; \
158 case 4: \
159 if (pao_ID__ == 1) \
160 asm("incl "__percpu_arg(0) : "+m" (var)); \
161 else if (pao_ID__ == -1) \
162 asm("decl "__percpu_arg(0) : "+m" (var)); \
163 else \
164 asm("addl %1, "__percpu_arg(0) \
165 : "+m" (var) \
166 : "ri" ((pao_T__)(val))); \
167 break; \
168 case 8: \
169 if (pao_ID__ == 1) \
170 asm("incq "__percpu_arg(0) : "+m" (var)); \
171 else if (pao_ID__ == -1) \
172 asm("decq "__percpu_arg(0) : "+m" (var)); \
173 else \
174 asm("addq %1, "__percpu_arg(0) \
175 : "+m" (var) \
176 : "re" ((pao_T__)(val))); \
177 break; \
178 default: __bad_percpu_size(); \
179 } \
180 } while (0)
181
182 #define percpu_from_op(op, var, constraint) \
183 ({ \
184 typeof(var) pfo_ret__; \
185 switch (sizeof(var)) { \
186 case 1: \
187 asm(op "b "__percpu_arg(1)",%0" \
188 : "=q" (pfo_ret__) \
189 : constraint); \
190 break; \
191 case 2: \
192 asm(op "w "__percpu_arg(1)",%0" \
193 : "=r" (pfo_ret__) \
194 : constraint); \
195 break; \
196 case 4: \
197 asm(op "l "__percpu_arg(1)",%0" \
198 : "=r" (pfo_ret__) \
199 : constraint); \
200 break; \
201 case 8: \
202 asm(op "q "__percpu_arg(1)",%0" \
203 : "=r" (pfo_ret__) \
204 : constraint); \
205 break; \
206 default: __bad_percpu_size(); \
207 } \
208 pfo_ret__; \
209 })
210
211 #define percpu_unary_op(op, var) \
212 ({ \
213 switch (sizeof(var)) { \
214 case 1: \
215 asm(op "b "__percpu_arg(0) \
216 : "+m" (var)); \
217 break; \
218 case 2: \
219 asm(op "w "__percpu_arg(0) \
220 : "+m" (var)); \
221 break; \
222 case 4: \
223 asm(op "l "__percpu_arg(0) \
224 : "+m" (var)); \
225 break; \
226 case 8: \
227 asm(op "q "__percpu_arg(0) \
228 : "+m" (var)); \
229 break; \
230 default: __bad_percpu_size(); \
231 } \
232 })
233
234 /*
235 * Add return operation
236 */
237 #define percpu_add_return_op(var, val) \
238 ({ \
239 typeof(var) paro_ret__ = val; \
240 switch (sizeof(var)) { \
241 case 1: \
242 asm("xaddb %0, "__percpu_arg(1) \
243 : "+q" (paro_ret__), "+m" (var) \
244 : : "memory"); \
245 break; \
246 case 2: \
247 asm("xaddw %0, "__percpu_arg(1) \
248 : "+r" (paro_ret__), "+m" (var) \
249 : : "memory"); \
250 break; \
251 case 4: \
252 asm("xaddl %0, "__percpu_arg(1) \
253 : "+r" (paro_ret__), "+m" (var) \
254 : : "memory"); \
255 break; \
256 case 8: \
257 asm("xaddq %0, "__percpu_arg(1) \
258 : "+re" (paro_ret__), "+m" (var) \
259 : : "memory"); \
260 break; \
261 default: __bad_percpu_size(); \
262 } \
263 paro_ret__ += val; \
264 paro_ret__; \
265 })
266
267 /*
268 * xchg is implemented using cmpxchg without a lock prefix. xchg is
269 * expensive due to the implied lock prefix. The processor cannot prefetch
270 * cachelines if xchg is used.
271 */
272 #define percpu_xchg_op(var, nval) \
273 ({ \
274 typeof(var) pxo_ret__; \
275 typeof(var) pxo_new__ = (nval); \
276 switch (sizeof(var)) { \
277 case 1: \
278 asm("\n\tmov "__percpu_arg(1)",%%al" \
279 "\n1:\tcmpxchgb %2, "__percpu_arg(1) \
280 "\n\tjnz 1b" \
281 : "=&a" (pxo_ret__), "+m" (var) \
282 : "q" (pxo_new__) \
283 : "memory"); \
284 break; \
285 case 2: \
286 asm("\n\tmov "__percpu_arg(1)",%%ax" \
287 "\n1:\tcmpxchgw %2, "__percpu_arg(1) \
288 "\n\tjnz 1b" \
289 : "=&a" (pxo_ret__), "+m" (var) \
290 : "r" (pxo_new__) \
291 : "memory"); \
292 break; \
293 case 4: \
294 asm("\n\tmov "__percpu_arg(1)",%%eax" \
295 "\n1:\tcmpxchgl %2, "__percpu_arg(1) \
296 "\n\tjnz 1b" \
297 : "=&a" (pxo_ret__), "+m" (var) \
298 : "r" (pxo_new__) \
299 : "memory"); \
300 break; \
301 case 8: \
302 asm("\n\tmov "__percpu_arg(1)",%%rax" \
303 "\n1:\tcmpxchgq %2, "__percpu_arg(1) \
304 "\n\tjnz 1b" \
305 : "=&a" (pxo_ret__), "+m" (var) \
306 : "r" (pxo_new__) \
307 : "memory"); \
308 break; \
309 default: __bad_percpu_size(); \
310 } \
311 pxo_ret__; \
312 })
313
314 /*
315 * cmpxchg has no such implied lock semantics as a result it is much
316 * more efficient for cpu local operations.
317 */
318 #define percpu_cmpxchg_op(var, oval, nval) \
319 ({ \
320 typeof(var) pco_ret__; \
321 typeof(var) pco_old__ = (oval); \
322 typeof(var) pco_new__ = (nval); \
323 switch (sizeof(var)) { \
324 case 1: \
325 asm("cmpxchgb %2, "__percpu_arg(1) \
326 : "=a" (pco_ret__), "+m" (var) \
327 : "q" (pco_new__), "0" (pco_old__) \
328 : "memory"); \
329 break; \
330 case 2: \
331 asm("cmpxchgw %2, "__percpu_arg(1) \
332 : "=a" (pco_ret__), "+m" (var) \
333 : "r" (pco_new__), "0" (pco_old__) \
334 : "memory"); \
335 break; \
336 case 4: \
337 asm("cmpxchgl %2, "__percpu_arg(1) \
338 : "=a" (pco_ret__), "+m" (var) \
339 : "r" (pco_new__), "0" (pco_old__) \
340 : "memory"); \
341 break; \
342 case 8: \
343 asm("cmpxchgq %2, "__percpu_arg(1) \
344 : "=a" (pco_ret__), "+m" (var) \
345 : "r" (pco_new__), "0" (pco_old__) \
346 : "memory"); \
347 break; \
348 default: __bad_percpu_size(); \
349 } \
350 pco_ret__; \
351 })
352
353 /*
354 * percpu_read() makes gcc load the percpu variable every time it is
355 * accessed while percpu_read_stable() allows the value to be cached.
356 * percpu_read_stable() is more efficient and can be used if its value
357 * is guaranteed to be valid across cpus. The current users include
358 * get_current() and get_thread_info() both of which are actually
359 * per-thread variables implemented as per-cpu variables and thus
360 * stable for the duration of the respective task.
361 */
362 #define percpu_read(var) percpu_from_op("mov", var, "m" (var))
363 #define percpu_read_stable(var) percpu_from_op("mov", var, "p" (&(var)))
364 #define percpu_write(var, val) percpu_to_op("mov", var, val)
365 #define percpu_add(var, val) percpu_add_op(var, val)
366 #define percpu_sub(var, val) percpu_add_op(var, -(val))
367 #define percpu_and(var, val) percpu_to_op("and", var, val)
368 #define percpu_or(var, val) percpu_to_op("or", var, val)
369 #define percpu_xor(var, val) percpu_to_op("xor", var, val)
370 #define percpu_inc(var) percpu_unary_op("inc", var)
371
372 #define __this_cpu_read_1(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
373 #define __this_cpu_read_2(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
374 #define __this_cpu_read_4(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
375
376 #define __this_cpu_write_1(pcp, val) percpu_to_op("mov", (pcp), val)
377 #define __this_cpu_write_2(pcp, val) percpu_to_op("mov", (pcp), val)
378 #define __this_cpu_write_4(pcp, val) percpu_to_op("mov", (pcp), val)
379 #define __this_cpu_add_1(pcp, val) percpu_add_op((pcp), val)
380 #define __this_cpu_add_2(pcp, val) percpu_add_op((pcp), val)
381 #define __this_cpu_add_4(pcp, val) percpu_add_op((pcp), val)
382 #define __this_cpu_and_1(pcp, val) percpu_to_op("and", (pcp), val)
383 #define __this_cpu_and_2(pcp, val) percpu_to_op("and", (pcp), val)
384 #define __this_cpu_and_4(pcp, val) percpu_to_op("and", (pcp), val)
385 #define __this_cpu_or_1(pcp, val) percpu_to_op("or", (pcp), val)
386 #define __this_cpu_or_2(pcp, val) percpu_to_op("or", (pcp), val)
387 #define __this_cpu_or_4(pcp, val) percpu_to_op("or", (pcp), val)
388 #define __this_cpu_xor_1(pcp, val) percpu_to_op("xor", (pcp), val)
389 #define __this_cpu_xor_2(pcp, val) percpu_to_op("xor", (pcp), val)
390 #define __this_cpu_xor_4(pcp, val) percpu_to_op("xor", (pcp), val)
391 #define __this_cpu_xchg_1(pcp, val) percpu_xchg_op(pcp, val)
392 #define __this_cpu_xchg_2(pcp, val) percpu_xchg_op(pcp, val)
393 #define __this_cpu_xchg_4(pcp, val) percpu_xchg_op(pcp, val)
394
395 #define this_cpu_read_1(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
396 #define this_cpu_read_2(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
397 #define this_cpu_read_4(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
398 #define this_cpu_write_1(pcp, val) percpu_to_op("mov", (pcp), val)
399 #define this_cpu_write_2(pcp, val) percpu_to_op("mov", (pcp), val)
400 #define this_cpu_write_4(pcp, val) percpu_to_op("mov", (pcp), val)
401 #define this_cpu_add_1(pcp, val) percpu_add_op((pcp), val)
402 #define this_cpu_add_2(pcp, val) percpu_add_op((pcp), val)
403 #define this_cpu_add_4(pcp, val) percpu_add_op((pcp), val)
404 #define this_cpu_and_1(pcp, val) percpu_to_op("and", (pcp), val)
405 #define this_cpu_and_2(pcp, val) percpu_to_op("and", (pcp), val)
406 #define this_cpu_and_4(pcp, val) percpu_to_op("and", (pcp), val)
407 #define this_cpu_or_1(pcp, val) percpu_to_op("or", (pcp), val)
408 #define this_cpu_or_2(pcp, val) percpu_to_op("or", (pcp), val)
409 #define this_cpu_or_4(pcp, val) percpu_to_op("or", (pcp), val)
410 #define this_cpu_xor_1(pcp, val) percpu_to_op("xor", (pcp), val)
411 #define this_cpu_xor_2(pcp, val) percpu_to_op("xor", (pcp), val)
412 #define this_cpu_xor_4(pcp, val) percpu_to_op("xor", (pcp), val)
413 #define this_cpu_xchg_1(pcp, nval) percpu_xchg_op(pcp, nval)
414 #define this_cpu_xchg_2(pcp, nval) percpu_xchg_op(pcp, nval)
415 #define this_cpu_xchg_4(pcp, nval) percpu_xchg_op(pcp, nval)
416
417 #ifndef CONFIG_M386
418 #define __this_cpu_add_return_1(pcp, val) percpu_add_return_op(pcp, val)
419 #define __this_cpu_add_return_2(pcp, val) percpu_add_return_op(pcp, val)
420 #define __this_cpu_add_return_4(pcp, val) percpu_add_return_op(pcp, val)
421 #define __this_cpu_cmpxchg_1(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
422 #define __this_cpu_cmpxchg_2(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
423 #define __this_cpu_cmpxchg_4(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
424
425 #define this_cpu_add_return_1(pcp, val) percpu_add_return_op(pcp, val)
426 #define this_cpu_add_return_2(pcp, val) percpu_add_return_op(pcp, val)
427 #define this_cpu_add_return_4(pcp, val) percpu_add_return_op(pcp, val)
428 #define this_cpu_cmpxchg_1(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
429 #define this_cpu_cmpxchg_2(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
430 #define this_cpu_cmpxchg_4(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
431
432 #endif /* !CONFIG_M386 */
433
434 #ifdef CONFIG_X86_CMPXCHG64
435 #define percpu_cmpxchg8b_double(pcp1, pcp2, o1, o2, n1, n2) \
436 ({ \
437 bool __ret; \
438 typeof(pcp1) __o1 = (o1), __n1 = (n1); \
439 typeof(pcp2) __o2 = (o2), __n2 = (n2); \
440 asm volatile("cmpxchg8b "__percpu_arg(1)"\n\tsetz %0\n\t" \
441 : "=a" (__ret), "+m" (pcp1), "+m" (pcp2), "+d" (__o2) \
442 : "b" (__n1), "c" (__n2), "a" (__o1)); \
443 __ret; \
444 })
445
446 #define __this_cpu_cmpxchg_double_4 percpu_cmpxchg8b_double
447 #define this_cpu_cmpxchg_double_4 percpu_cmpxchg8b_double
448 #endif /* CONFIG_X86_CMPXCHG64 */
449
450 /*
451 * Per cpu atomic 64 bit operations are only available under 64 bit.
452 * 32 bit must fall back to generic operations.
453 */
454 #ifdef CONFIG_X86_64
455 #define __this_cpu_read_8(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
456 #define __this_cpu_write_8(pcp, val) percpu_to_op("mov", (pcp), val)
457 #define __this_cpu_add_8(pcp, val) percpu_add_op((pcp), val)
458 #define __this_cpu_and_8(pcp, val) percpu_to_op("and", (pcp), val)
459 #define __this_cpu_or_8(pcp, val) percpu_to_op("or", (pcp), val)
460 #define __this_cpu_xor_8(pcp, val) percpu_to_op("xor", (pcp), val)
461 #define __this_cpu_add_return_8(pcp, val) percpu_add_return_op(pcp, val)
462 #define __this_cpu_xchg_8(pcp, nval) percpu_xchg_op(pcp, nval)
463 #define __this_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
464
465 #define this_cpu_read_8(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
466 #define this_cpu_write_8(pcp, val) percpu_to_op("mov", (pcp), val)
467 #define this_cpu_add_8(pcp, val) percpu_add_op((pcp), val)
468 #define this_cpu_and_8(pcp, val) percpu_to_op("and", (pcp), val)
469 #define this_cpu_or_8(pcp, val) percpu_to_op("or", (pcp), val)
470 #define this_cpu_xor_8(pcp, val) percpu_to_op("xor", (pcp), val)
471 #define this_cpu_add_return_8(pcp, val) percpu_add_return_op(pcp, val)
472 #define this_cpu_xchg_8(pcp, nval) percpu_xchg_op(pcp, nval)
473 #define this_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval)
474
475 /*
476 * Pretty complex macro to generate cmpxchg16 instruction. The instruction
477 * is not supported on early AMD64 processors so we must be able to emulate
478 * it in software. The address used in the cmpxchg16 instruction must be
479 * aligned to a 16 byte boundary.
480 */
481 #define percpu_cmpxchg16b_double(pcp1, pcp2, o1, o2, n1, n2) \
482 ({ \
483 bool __ret; \
484 typeof(pcp1) __o1 = (o1), __n1 = (n1); \
485 typeof(pcp2) __o2 = (o2), __n2 = (n2); \
486 alternative_io("leaq %P1,%%rsi\n\tcall this_cpu_cmpxchg16b_emu\n\t", \
487 "cmpxchg16b " __percpu_arg(1) "\n\tsetz %0\n\t", \
488 X86_FEATURE_CX16, \
489 ASM_OUTPUT2("=a" (__ret), "+m" (pcp1), \
490 "+m" (pcp2), "+d" (__o2)), \
491 "b" (__n1), "c" (__n2), "a" (__o1) : "rsi"); \
492 __ret; \
493 })
494
495 #define __this_cpu_cmpxchg_double_8 percpu_cmpxchg16b_double
496 #define this_cpu_cmpxchg_double_8 percpu_cmpxchg16b_double
497
498 #endif
499
500 /* This is not atomic against other CPUs -- CPU preemption needs to be off */
501 #define x86_test_and_clear_bit_percpu(bit, var) \
502 ({ \
503 int old__; \
504 asm volatile("btr %2,"__percpu_arg(1)"\n\tsbbl %0,%0" \
505 : "=r" (old__), "+m" (var) \
506 : "dIr" (bit)); \
507 old__; \
508 })
509
510 static __always_inline int x86_this_cpu_constant_test_bit(unsigned int nr,
511 const unsigned long __percpu *addr)
512 {
513 unsigned long __percpu *a = (unsigned long *)addr + nr / BITS_PER_LONG;
514
515 return ((1UL << (nr % BITS_PER_LONG)) & percpu_read(*a)) != 0;
516 }
517
518 static inline int x86_this_cpu_variable_test_bit(int nr,
519 const unsigned long __percpu *addr)
520 {
521 int oldbit;
522
523 asm volatile("bt "__percpu_arg(2)",%1\n\t"
524 "sbb %0,%0"
525 : "=r" (oldbit)
526 : "m" (*(unsigned long *)addr), "Ir" (nr));
527
528 return oldbit;
529 }
530
531 #define x86_this_cpu_test_bit(nr, addr) \
532 (__builtin_constant_p((nr)) \
533 ? x86_this_cpu_constant_test_bit((nr), (addr)) \
534 : x86_this_cpu_variable_test_bit((nr), (addr)))
535
536
537 #include <asm-generic/percpu.h>
538
539 /* We can use this directly for local CPU (faster). */
540 DECLARE_PER_CPU(unsigned long, this_cpu_off);
541
542 #endif /* !__ASSEMBLY__ */
543
544 #ifdef CONFIG_SMP
545
546 /*
547 * Define the "EARLY_PER_CPU" macros. These are used for some per_cpu
548 * variables that are initialized and accessed before there are per_cpu
549 * areas allocated.
550 */
551
552 #define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \
553 DEFINE_PER_CPU(_type, _name) = _initvalue; \
554 __typeof__(_type) _name##_early_map[NR_CPUS] __initdata = \
555 { [0 ... NR_CPUS-1] = _initvalue }; \
556 __typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map
557
558 #define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \
559 EXPORT_PER_CPU_SYMBOL(_name)
560
561 #define DECLARE_EARLY_PER_CPU(_type, _name) \
562 DECLARE_PER_CPU(_type, _name); \
563 extern __typeof__(_type) *_name##_early_ptr; \
564 extern __typeof__(_type) _name##_early_map[]
565
566 #define early_per_cpu_ptr(_name) (_name##_early_ptr)
567 #define early_per_cpu_map(_name, _idx) (_name##_early_map[_idx])
568 #define early_per_cpu(_name, _cpu) \
569 *(early_per_cpu_ptr(_name) ? \
570 &early_per_cpu_ptr(_name)[_cpu] : \
571 &per_cpu(_name, _cpu))
572
573 #else /* !CONFIG_SMP */
574 #define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \
575 DEFINE_PER_CPU(_type, _name) = _initvalue
576
577 #define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \
578 EXPORT_PER_CPU_SYMBOL(_name)
579
580 #define DECLARE_EARLY_PER_CPU(_type, _name) \
581 DECLARE_PER_CPU(_type, _name)
582
583 #define early_per_cpu(_name, _cpu) per_cpu(_name, _cpu)
584 #define early_per_cpu_ptr(_name) NULL
585 /* no early_per_cpu_map() */
586
587 #endif /* !CONFIG_SMP */
588
589 #endif /* _ASM_X86_PERCPU_H */
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