1 /* 2 * linux/percpu-defs.h - basic definitions for percpu areas 3 * 4 * DO NOT INCLUDE DIRECTLY OUTSIDE PERCPU IMPLEMENTATION PROPER. 5 * 6 * This file is separate from linux/percpu.h to avoid cyclic inclusion 7 * dependency from arch header files. Only to be included from 8 * asm/percpu.h. 9 * 10 * This file includes macros necessary to declare percpu sections and 11 * variables, and definitions of percpu accessors and operations. It 12 * should provide enough percpu features to arch header files even when 13 * they can only include asm/percpu.h to avoid cyclic inclusion dependency. 14 */ 15 16 #ifndef _LINUX_PERCPU_DEFS_H 17 #define _LINUX_PERCPU_DEFS_H 18 19 #ifdef CONFIG_SMP 20 21 #ifdef MODULE 22 #define PER_CPU_SHARED_ALIGNED_SECTION "" 23 #define PER_CPU_ALIGNED_SECTION "" 24 #else 25 #define PER_CPU_SHARED_ALIGNED_SECTION "..shared_aligned" 26 #define PER_CPU_ALIGNED_SECTION "..shared_aligned" 27 #endif 28 #define PER_CPU_FIRST_SECTION "..first" 29 30 #else 31 32 #define PER_CPU_SHARED_ALIGNED_SECTION "" 33 #define PER_CPU_ALIGNED_SECTION "..shared_aligned" 34 #define PER_CPU_FIRST_SECTION "" 35 36 #endif 37 38 /* 39 * Base implementations of per-CPU variable declarations and definitions, where 40 * the section in which the variable is to be placed is provided by the 41 * 'sec' argument. This may be used to affect the parameters governing the 42 * variable's storage. 43 * 44 * NOTE! The sections for the DECLARE and for the DEFINE must match, lest 45 * linkage errors occur due the compiler generating the wrong code to access 46 * that section. 47 */ 48 #define __PCPU_ATTRS(sec) \ 49 __percpu __attribute__((section(PER_CPU_BASE_SECTION sec))) \ 50 PER_CPU_ATTRIBUTES 51 52 #define __PCPU_DUMMY_ATTRS \ 53 __attribute__((section(".discard"), unused)) 54 55 /* 56 * s390 and alpha modules require percpu variables to be defined as 57 * weak to force the compiler to generate GOT based external 58 * references for them. This is necessary because percpu sections 59 * will be located outside of the usually addressable area. 60 * 61 * This definition puts the following two extra restrictions when 62 * defining percpu variables. 63 * 64 * 1. The symbol must be globally unique, even the static ones. 65 * 2. Static percpu variables cannot be defined inside a function. 66 * 67 * Archs which need weak percpu definitions should define 68 * ARCH_NEEDS_WEAK_PER_CPU in asm/percpu.h when necessary. 69 * 70 * To ensure that the generic code observes the above two 71 * restrictions, if CONFIG_DEBUG_FORCE_WEAK_PER_CPU is set weak 72 * definition is used for all cases. 73 */ 74 #if defined(ARCH_NEEDS_WEAK_PER_CPU) || defined(CONFIG_DEBUG_FORCE_WEAK_PER_CPU) 75 /* 76 * __pcpu_scope_* dummy variable is used to enforce scope. It 77 * receives the static modifier when it's used in front of 78 * DEFINE_PER_CPU() and will trigger build failure if 79 * DECLARE_PER_CPU() is used for the same variable. 80 * 81 * __pcpu_unique_* dummy variable is used to enforce symbol uniqueness 82 * such that hidden weak symbol collision, which will cause unrelated 83 * variables to share the same address, can be detected during build. 84 */ 85 #define DECLARE_PER_CPU_SECTION(type, name, sec) \ 86 extern __PCPU_DUMMY_ATTRS char __pcpu_scope_##name; \ 87 extern __PCPU_ATTRS(sec) __typeof__(type) name 88 89 #define DEFINE_PER_CPU_SECTION(type, name, sec) \ 90 __PCPU_DUMMY_ATTRS char __pcpu_scope_##name; \ 91 extern __PCPU_DUMMY_ATTRS char __pcpu_unique_##name; \ 92 __PCPU_DUMMY_ATTRS char __pcpu_unique_##name; \ 93 extern __PCPU_ATTRS(sec) __typeof__(type) name; \ 94 __PCPU_ATTRS(sec) PER_CPU_DEF_ATTRIBUTES __weak \ 95 __typeof__(type) name 96 #else 97 /* 98 * Normal declaration and definition macros. 99 */ 100 #define DECLARE_PER_CPU_SECTION(type, name, sec) \ 101 extern __PCPU_ATTRS(sec) __typeof__(type) name 102 103 #define DEFINE_PER_CPU_SECTION(type, name, sec) \ 104 __PCPU_ATTRS(sec) PER_CPU_DEF_ATTRIBUTES \ 105 __typeof__(type) name 106 #endif 107 108 /* 109 * Variant on the per-CPU variable declaration/definition theme used for 110 * ordinary per-CPU variables. 111 */ 112 #define DECLARE_PER_CPU(type, name) \ 113 DECLARE_PER_CPU_SECTION(type, name, "") 114 115 #define DEFINE_PER_CPU(type, name) \ 116 DEFINE_PER_CPU_SECTION(type, name, "") 117 118 /* 119 * Declaration/definition used for per-CPU variables that must come first in 120 * the set of variables. 121 */ 122 #define DECLARE_PER_CPU_FIRST(type, name) \ 123 DECLARE_PER_CPU_SECTION(type, name, PER_CPU_FIRST_SECTION) 124 125 #define DEFINE_PER_CPU_FIRST(type, name) \ 126 DEFINE_PER_CPU_SECTION(type, name, PER_CPU_FIRST_SECTION) 127 128 /* 129 * Declaration/definition used for per-CPU variables that must be cacheline 130 * aligned under SMP conditions so that, whilst a particular instance of the 131 * data corresponds to a particular CPU, inefficiencies due to direct access by 132 * other CPUs are reduced by preventing the data from unnecessarily spanning 133 * cachelines. 134 * 135 * An example of this would be statistical data, where each CPU's set of data 136 * is updated by that CPU alone, but the data from across all CPUs is collated 137 * by a CPU processing a read from a proc file. 138 */ 139 #define DECLARE_PER_CPU_SHARED_ALIGNED(type, name) \ 140 DECLARE_PER_CPU_SECTION(type, name, PER_CPU_SHARED_ALIGNED_SECTION) \ 141 ____cacheline_aligned_in_smp 142 143 #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ 144 DEFINE_PER_CPU_SECTION(type, name, PER_CPU_SHARED_ALIGNED_SECTION) \ 145 ____cacheline_aligned_in_smp 146 147 #define DECLARE_PER_CPU_ALIGNED(type, name) \ 148 DECLARE_PER_CPU_SECTION(type, name, PER_CPU_ALIGNED_SECTION) \ 149 ____cacheline_aligned 150 151 #define DEFINE_PER_CPU_ALIGNED(type, name) \ 152 DEFINE_PER_CPU_SECTION(type, name, PER_CPU_ALIGNED_SECTION) \ 153 ____cacheline_aligned 154 155 /* 156 * Declaration/definition used for per-CPU variables that must be page aligned. 157 */ 158 #define DECLARE_PER_CPU_PAGE_ALIGNED(type, name) \ 159 DECLARE_PER_CPU_SECTION(type, name, "..page_aligned") \ 160 __aligned(PAGE_SIZE) 161 162 #define DEFINE_PER_CPU_PAGE_ALIGNED(type, name) \ 163 DEFINE_PER_CPU_SECTION(type, name, "..page_aligned") \ 164 __aligned(PAGE_SIZE) 165 166 /* 167 * Declaration/definition used for per-CPU variables that must be read mostly. 168 */ 169 #define DECLARE_PER_CPU_READ_MOSTLY(type, name) \ 170 DECLARE_PER_CPU_SECTION(type, name, "..read_mostly") 171 172 #define DEFINE_PER_CPU_READ_MOSTLY(type, name) \ 173 DEFINE_PER_CPU_SECTION(type, name, "..read_mostly") 174 175 /* 176 * Declaration/definition used for per-CPU variables that should be accessed 177 * as decrypted when memory encryption is enabled in the guest. 178 */ 179 #if defined(CONFIG_VIRTUALIZATION) && defined(CONFIG_AMD_MEM_ENCRYPT) 180 181 #define DECLARE_PER_CPU_DECRYPTED(type, name) \ 182 DECLARE_PER_CPU_SECTION(type, name, "..decrypted") 183 184 #define DEFINE_PER_CPU_DECRYPTED(type, name) \ 185 DEFINE_PER_CPU_SECTION(type, name, "..decrypted") 186 #else 187 #define DEFINE_PER_CPU_DECRYPTED(type, name) DEFINE_PER_CPU(type, name) 188 #endif 189 190 /* 191 * Intermodule exports for per-CPU variables. sparse forgets about 192 * address space across EXPORT_SYMBOL(), change EXPORT_SYMBOL() to 193 * noop if __CHECKER__. 194 */ 195 #ifndef __CHECKER__ 196 #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(var) 197 #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(var) 198 #else 199 #define EXPORT_PER_CPU_SYMBOL(var) 200 #define EXPORT_PER_CPU_SYMBOL_GPL(var) 201 #endif 202 203 /* 204 * Accessors and operations. 205 */ 206 #ifndef __ASSEMBLY__ 207 208 /* 209 * __verify_pcpu_ptr() verifies @ptr is a percpu pointer without evaluating 210 * @ptr and is invoked once before a percpu area is accessed by all 211 * accessors and operations. This is performed in the generic part of 212 * percpu and arch overrides don't need to worry about it; however, if an 213 * arch wants to implement an arch-specific percpu accessor or operation, 214 * it may use __verify_pcpu_ptr() to verify the parameters. 215 * 216 * + 0 is required in order to convert the pointer type from a 217 * potential array type to a pointer to a single item of the array. 218 */ 219 #define __verify_pcpu_ptr(ptr) \ 220 do { \ 221 const void __percpu *__vpp_verify = (typeof((ptr) + 0))NULL; \ 222 (void)__vpp_verify; \ 223 } while (0) 224 225 #ifdef CONFIG_SMP 226 227 /* 228 * Add an offset to a pointer but keep the pointer as-is. Use RELOC_HIDE() 229 * to prevent the compiler from making incorrect assumptions about the 230 * pointer value. The weird cast keeps both GCC and sparse happy. 231 */ 232 #define SHIFT_PERCPU_PTR(__p, __offset) \ 233 RELOC_HIDE((typeof(*(__p)) __kernel __force *)(__p), (__offset)) 234 235 #define per_cpu_ptr(ptr, cpu) \ 236 ({ \ 237 __verify_pcpu_ptr(ptr); \ 238 SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu))); \ 239 }) 240 241 #define raw_cpu_ptr(ptr) \ 242 ({ \ 243 __verify_pcpu_ptr(ptr); \ 244 arch_raw_cpu_ptr(ptr); \ 245 }) 246 247 #ifdef CONFIG_DEBUG_PREEMPT 248 #define this_cpu_ptr(ptr) \ 249 ({ \ 250 __verify_pcpu_ptr(ptr); \ 251 SHIFT_PERCPU_PTR(ptr, my_cpu_offset); \ 252 }) 253 #else 254 #define this_cpu_ptr(ptr) raw_cpu_ptr(ptr) 255 #endif 256 257 #else /* CONFIG_SMP */ 258 259 #define VERIFY_PERCPU_PTR(__p) \ 260 ({ \ 261 __verify_pcpu_ptr(__p); \ 262 (typeof(*(__p)) __kernel __force *)(__p); \ 263 }) 264 265 #define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); VERIFY_PERCPU_PTR(ptr); }) 266 #define raw_cpu_ptr(ptr) per_cpu_ptr(ptr, 0) 267 #define this_cpu_ptr(ptr) raw_cpu_ptr(ptr) 268 269 #endif /* CONFIG_SMP */ 270 271 #define per_cpu(var, cpu) (*per_cpu_ptr(&(var), cpu)) 272 273 /* 274 * Must be an lvalue. Since @var must be a simple identifier, 275 * we force a syntax error here if it isn't. 276 */ 277 #define get_cpu_var(var) \ 278 (*({ \ 279 preempt_disable(); \ 280 this_cpu_ptr(&var); \ 281 })) 282 283 /* 284 * The weird & is necessary because sparse considers (void)(var) to be 285 * a direct dereference of percpu variable (var). 286 */ 287 #define put_cpu_var(var) \ 288 do { \ 289 (void)&(var); \ 290 preempt_enable(); \ 291 } while (0) 292 293 #define get_cpu_ptr(var) \ 294 ({ \ 295 preempt_disable(); \ 296 this_cpu_ptr(var); \ 297 }) 298 299 #define put_cpu_ptr(var) \ 300 do { \ 301 (void)(var); \ 302 preempt_enable(); \ 303 } while (0) 304 305 /* 306 * Branching function to split up a function into a set of functions that 307 * are called for different scalar sizes of the objects handled. 308 */ 309 310 extern void __bad_size_call_parameter(void); 311 312 #ifdef CONFIG_DEBUG_PREEMPT 313 extern void __this_cpu_preempt_check(const char *op); 314 #else 315 static inline void __this_cpu_preempt_check(const char *op) { } 316 #endif 317 318 #define __pcpu_size_call_return(stem, variable) \ 319 ({ \ 320 typeof(variable) pscr_ret__; \ 321 __verify_pcpu_ptr(&(variable)); \ 322 switch(sizeof(variable)) { \ 323 case 1: pscr_ret__ = stem##1(variable); break; \ 324 case 2: pscr_ret__ = stem##2(variable); break; \ 325 case 4: pscr_ret__ = stem##4(variable); break; \ 326 case 8: pscr_ret__ = stem##8(variable); break; \ 327 default: \ 328 __bad_size_call_parameter(); break; \ 329 } \ 330 pscr_ret__; \ 331 }) 332 333 #define __pcpu_size_call_return2(stem, variable, ...) \ 334 ({ \ 335 typeof(variable) pscr2_ret__; \ 336 __verify_pcpu_ptr(&(variable)); \ 337 switch(sizeof(variable)) { \ 338 case 1: pscr2_ret__ = stem##1(variable, __VA_ARGS__); break; \ 339 case 2: pscr2_ret__ = stem##2(variable, __VA_ARGS__); break; \ 340 case 4: pscr2_ret__ = stem##4(variable, __VA_ARGS__); break; \ 341 case 8: pscr2_ret__ = stem##8(variable, __VA_ARGS__); break; \ 342 default: \ 343 __bad_size_call_parameter(); break; \ 344 } \ 345 pscr2_ret__; \ 346 }) 347 348 /* 349 * Special handling for cmpxchg_double. cmpxchg_double is passed two 350 * percpu variables. The first has to be aligned to a double word 351 * boundary and the second has to follow directly thereafter. 352 * We enforce this on all architectures even if they don't support 353 * a double cmpxchg instruction, since it's a cheap requirement, and it 354 * avoids breaking the requirement for architectures with the instruction. 355 */ 356 #define __pcpu_double_call_return_bool(stem, pcp1, pcp2, ...) \ 357 ({ \ 358 bool pdcrb_ret__; \ 359 __verify_pcpu_ptr(&(pcp1)); \ 360 BUILD_BUG_ON(sizeof(pcp1) != sizeof(pcp2)); \ 361 VM_BUG_ON((unsigned long)(&(pcp1)) % (2 * sizeof(pcp1))); \ 362 VM_BUG_ON((unsigned long)(&(pcp2)) != \ 363 (unsigned long)(&(pcp1)) + sizeof(pcp1)); \ 364 switch(sizeof(pcp1)) { \ 365 case 1: pdcrb_ret__ = stem##1(pcp1, pcp2, __VA_ARGS__); break; \ 366 case 2: pdcrb_ret__ = stem##2(pcp1, pcp2, __VA_ARGS__); break; \ 367 case 4: pdcrb_ret__ = stem##4(pcp1, pcp2, __VA_ARGS__); break; \ 368 case 8: pdcrb_ret__ = stem##8(pcp1, pcp2, __VA_ARGS__); break; \ 369 default: \ 370 __bad_size_call_parameter(); break; \ 371 } \ 372 pdcrb_ret__; \ 373 }) 374 375 #define __pcpu_size_call(stem, variable, ...) \ 376 do { \ 377 __verify_pcpu_ptr(&(variable)); \ 378 switch(sizeof(variable)) { \ 379 case 1: stem##1(variable, __VA_ARGS__);break; \ 380 case 2: stem##2(variable, __VA_ARGS__);break; \ 381 case 4: stem##4(variable, __VA_ARGS__);break; \ 382 case 8: stem##8(variable, __VA_ARGS__);break; \ 383 default: \ 384 __bad_size_call_parameter();break; \ 385 } \ 386 } while (0) 387 388 /* 389 * this_cpu operations (C) 2008-2013 Christoph Lameter <cl@linux.com> 390 * 391 * Optimized manipulation for memory allocated through the per cpu 392 * allocator or for addresses of per cpu variables. 393 * 394 * These operation guarantee exclusivity of access for other operations 395 * on the *same* processor. The assumption is that per cpu data is only 396 * accessed by a single processor instance (the current one). 397 * 398 * The arch code can provide optimized implementation by defining macros 399 * for certain scalar sizes. F.e. provide this_cpu_add_2() to provide per 400 * cpu atomic operations for 2 byte sized RMW actions. If arch code does 401 * not provide operations for a scalar size then the fallback in the 402 * generic code will be used. 403 * 404 * cmpxchg_double replaces two adjacent scalars at once. The first two 405 * parameters are per cpu variables which have to be of the same size. A 406 * truth value is returned to indicate success or failure (since a double 407 * register result is difficult to handle). There is very limited hardware 408 * support for these operations, so only certain sizes may work. 409 */ 410 411 /* 412 * Operations for contexts where we do not want to do any checks for 413 * preemptions. Unless strictly necessary, always use [__]this_cpu_*() 414 * instead. 415 * 416 * If there is no other protection through preempt disable and/or disabling 417 * interupts then one of these RMW operations can show unexpected behavior 418 * because the execution thread was rescheduled on another processor or an 419 * interrupt occurred and the same percpu variable was modified from the 420 * interrupt context. 421 */ 422 #define raw_cpu_read(pcp) __pcpu_size_call_return(raw_cpu_read_, pcp) 423 #define raw_cpu_write(pcp, val) __pcpu_size_call(raw_cpu_write_, pcp, val) 424 #define raw_cpu_add(pcp, val) __pcpu_size_call(raw_cpu_add_, pcp, val) 425 #define raw_cpu_and(pcp, val) __pcpu_size_call(raw_cpu_and_, pcp, val) 426 #define raw_cpu_or(pcp, val) __pcpu_size_call(raw_cpu_or_, pcp, val) 427 #define raw_cpu_add_return(pcp, val) __pcpu_size_call_return2(raw_cpu_add_return_, pcp, val) 428 #define raw_cpu_xchg(pcp, nval) __pcpu_size_call_return2(raw_cpu_xchg_, pcp, nval) 429 #define raw_cpu_cmpxchg(pcp, oval, nval) \ 430 __pcpu_size_call_return2(raw_cpu_cmpxchg_, pcp, oval, nval) 431 #define raw_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ 432 __pcpu_double_call_return_bool(raw_cpu_cmpxchg_double_, pcp1, pcp2, oval1, oval2, nval1, nval2) 433 434 #define raw_cpu_sub(pcp, val) raw_cpu_add(pcp, -(val)) 435 #define raw_cpu_inc(pcp) raw_cpu_add(pcp, 1) 436 #define raw_cpu_dec(pcp) raw_cpu_sub(pcp, 1) 437 #define raw_cpu_sub_return(pcp, val) raw_cpu_add_return(pcp, -(typeof(pcp))(val)) 438 #define raw_cpu_inc_return(pcp) raw_cpu_add_return(pcp, 1) 439 #define raw_cpu_dec_return(pcp) raw_cpu_add_return(pcp, -1) 440 441 /* 442 * Operations for contexts that are safe from preemption/interrupts. These 443 * operations verify that preemption is disabled. 444 */ 445 #define __this_cpu_read(pcp) \ 446 ({ \ 447 __this_cpu_preempt_check("read"); \ 448 raw_cpu_read(pcp); \ 449 }) 450 451 #define __this_cpu_write(pcp, val) \ 452 ({ \ 453 __this_cpu_preempt_check("write"); \ 454 raw_cpu_write(pcp, val); \ 455 }) 456 457 #define __this_cpu_add(pcp, val) \ 458 ({ \ 459 __this_cpu_preempt_check("add"); \ 460 raw_cpu_add(pcp, val); \ 461 }) 462 463 #define __this_cpu_and(pcp, val) \ 464 ({ \ 465 __this_cpu_preempt_check("and"); \ 466 raw_cpu_and(pcp, val); \ 467 }) 468 469 #define __this_cpu_or(pcp, val) \ 470 ({ \ 471 __this_cpu_preempt_check("or"); \ 472 raw_cpu_or(pcp, val); \ 473 }) 474 475 #define __this_cpu_add_return(pcp, val) \ 476 ({ \ 477 __this_cpu_preempt_check("add_return"); \ 478 raw_cpu_add_return(pcp, val); \ 479 }) 480 481 #define __this_cpu_xchg(pcp, nval) \ 482 ({ \ 483 __this_cpu_preempt_check("xchg"); \ 484 raw_cpu_xchg(pcp, nval); \ 485 }) 486 487 #define __this_cpu_cmpxchg(pcp, oval, nval) \ 488 ({ \ 489 __this_cpu_preempt_check("cmpxchg"); \ 490 raw_cpu_cmpxchg(pcp, oval, nval); \ 491 }) 492 493 #define __this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ 494 ({ __this_cpu_preempt_check("cmpxchg_double"); \ 495 raw_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2); \ 496 }) 497 498 #define __this_cpu_sub(pcp, val) __this_cpu_add(pcp, -(typeof(pcp))(val)) 499 #define __this_cpu_inc(pcp) __this_cpu_add(pcp, 1) 500 #define __this_cpu_dec(pcp) __this_cpu_sub(pcp, 1) 501 #define __this_cpu_sub_return(pcp, val) __this_cpu_add_return(pcp, -(typeof(pcp))(val)) 502 #define __this_cpu_inc_return(pcp) __this_cpu_add_return(pcp, 1) 503 #define __this_cpu_dec_return(pcp) __this_cpu_add_return(pcp, -1) 504 505 /* 506 * Operations with implied preemption/interrupt protection. These 507 * operations can be used without worrying about preemption or interrupt. 508 */ 509 #define this_cpu_read(pcp) __pcpu_size_call_return(this_cpu_read_, pcp) 510 #define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, pcp, val) 511 #define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, pcp, val) 512 #define this_cpu_and(pcp, val) __pcpu_size_call(this_cpu_and_, pcp, val) 513 #define this_cpu_or(pcp, val) __pcpu_size_call(this_cpu_or_, pcp, val) 514 #define this_cpu_add_return(pcp, val) __pcpu_size_call_return2(this_cpu_add_return_, pcp, val) 515 #define this_cpu_xchg(pcp, nval) __pcpu_size_call_return2(this_cpu_xchg_, pcp, nval) 516 #define this_cpu_cmpxchg(pcp, oval, nval) \ 517 __pcpu_size_call_return2(this_cpu_cmpxchg_, pcp, oval, nval) 518 #define this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ 519 __pcpu_double_call_return_bool(this_cpu_cmpxchg_double_, pcp1, pcp2, oval1, oval2, nval1, nval2) 520 521 #define this_cpu_sub(pcp, val) this_cpu_add(pcp, -(typeof(pcp))(val)) 522 #define this_cpu_inc(pcp) this_cpu_add(pcp, 1) 523 #define this_cpu_dec(pcp) this_cpu_sub(pcp, 1) 524 #define this_cpu_sub_return(pcp, val) this_cpu_add_return(pcp, -(typeof(pcp))(val)) 525 #define this_cpu_inc_return(pcp) this_cpu_add_return(pcp, 1) 526 #define this_cpu_dec_return(pcp) this_cpu_add_return(pcp, -1) 527 528 #endif /* __ASSEMBLY__ */ 529 #endif /* _LINUX_PERCPU_DEFS_H */ 530