include/linux/percpu.h

   1 #ifndef __LINUX_PERCPU_H
   2 #define __LINUX_PERCPU_H
   3
   4 #include <linux/preempt.h>
   5 #include <linux/smp.h>
   6 #include <linux/cpumask.h>
   7 #include <linux/pfn.h>
   8 #include <linux/init.h>
   9
  10 #include <asm/percpu.h>
  11
  12 /* enough to cover all DEFINE_PER_CPUs in modules */
  13 #ifdef CONFIG_MODULES
  14 #define PERCPU_MODULE_RESERVE           (8 << 10)
  15 #else
  16 #define PERCPU_MODULE_RESERVE           0
  17 #endif
  18
  19 #ifndef PERCPU_ENOUGH_ROOM
  20 #define PERCPU_ENOUGH_ROOM                                              \
  21         (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) +      \
  22          PERCPU_MODULE_RESERVE)
  23 #endif
  24
  25 /*
  26  * Must be an lvalue. Since @var must be a simple identifier,
  27  * we force a syntax error here if it isn't.
  28  */
  29 #define get_cpu_var(var) (*({                           \
  30         preempt_disable();                              \
  31         &__get_cpu_var(var); }))
  32
  33 /*
  34  * The weird & is necessary because sparse considers (void)(var) to be
  35  * a direct dereference of percpu variable (var).
  36  */
  37 #define put_cpu_var(var) do {                           \
  38         (void)&(var);                                   \
  39         preempt_enable();                               \
  40 } while (0)
  41
  42 #ifdef CONFIG_SMP
  43
  44 /* minimum unit size, also is the maximum supported allocation size */
  45 #define PCPU_MIN_UNIT_SIZE              PFN_ALIGN(64 << 10)
  46
  47 /*
  48  * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy
  49  * back on the first chunk for dynamic percpu allocation if arch is
  50  * manually allocating and mapping it for faster access (as a part of
  51  * large page mapping for example).
  52  *
  53  * The following values give between one and two pages of free space
  54  * after typical minimal boot (2-way SMP, single disk and NIC) with
  55  * both defconfig and a distro config on x86_64 and 32.  More
  56  * intelligent way to determine this would be nice.
  57  */
  58 #if BITS_PER_LONG > 32
  59 #define PERCPU_DYNAMIC_RESERVE          (20 << 10)
  60 #else
  61 #define PERCPU_DYNAMIC_RESERVE          (12 << 10)
  62 #endif
  63
  64 extern void *pcpu_base_addr;
  65 extern const unsigned long *pcpu_unit_offsets;
  66
  67 struct pcpu_group_info {
  68         int                     nr_units;       /* aligned # of units */
  69         unsigned long           base_offset;    /* base address offset */
  70         unsigned int            *cpu_map;       /* unit->cpu map, empty
  71                                                  * entries contain NR_CPUS */
  72 };
  73
  74 struct pcpu_alloc_info {
  75         size_t                  static_size;
  76         size_t                  reserved_size;
  77         size_t                  dyn_size;
  78         size_t                  unit_size;
  79         size_t                  atom_size;
  80         size_t                  alloc_size;
  81         size_t                  __ai_size;      /* internal, don't use */
  82         int                     nr_groups;      /* 0 if grouping unnecessary */
  83         struct pcpu_group_info  groups[];
  84 };
  85
  86 enum pcpu_fc {
  87         PCPU_FC_AUTO,
  88         PCPU_FC_EMBED,
  89         PCPU_FC_PAGE,
  90
  91         PCPU_FC_NR,
  92 };
  93 extern const char *pcpu_fc_names[PCPU_FC_NR];
  94
  95 extern enum pcpu_fc pcpu_chosen_fc;
  96
  97 typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size,
  98                                      size_t align);
  99 typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size);
 100 typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr);
 101 typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to);
 102
 103 extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups,
 104                                                              int nr_units);
 105 extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai);
 106
 107 extern struct pcpu_alloc_info * __init pcpu_build_alloc_info(
 108                                 size_t reserved_size, ssize_t dyn_size,
 109                                 size_t atom_size,
 110                                 pcpu_fc_cpu_distance_fn_t cpu_distance_fn);
 111
 112 extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
 113                                          void *base_addr);
 114
 115 #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK
 116 extern int __init pcpu_embed_first_chunk(size_t reserved_size, ssize_t dyn_size,
 117                                 size_t atom_size,
 118                                 pcpu_fc_cpu_distance_fn_t cpu_distance_fn,
 119                                 pcpu_fc_alloc_fn_t alloc_fn,
 120                                 pcpu_fc_free_fn_t free_fn);
 121 #endif
 122
 123 #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
 124 extern int __init pcpu_page_first_chunk(size_t reserved_size,
 125                                 pcpu_fc_alloc_fn_t alloc_fn,
 126                                 pcpu_fc_free_fn_t free_fn,
 127                                 pcpu_fc_populate_pte_fn_t populate_pte_fn);
 128 #endif
 129
 130 /*
 131  * Use this to get to a cpu's version of the per-cpu object
 132  * dynamically allocated. Non-atomic access to the current CPU's
 133  * version should probably be combined with get_cpu()/put_cpu().
 134  */
 135 #define per_cpu_ptr(ptr, cpu)   SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu)))
 136
 137 extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align);
 138 extern bool is_kernel_percpu_address(unsigned long addr);
 139
 140 #ifndef CONFIG_HAVE_SETUP_PER_CPU_AREA
 141 extern void __init setup_per_cpu_areas(void);
 142 #endif
 143
 144 #else /* CONFIG_SMP */
 145
 146 #define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); (ptr); })
 147
 148 /* can't distinguish from other static vars, always false */
 149 static inline bool is_kernel_percpu_address(unsigned long addr)
 150 {
 151         return false;
 152 }
 153
 154 static inline void __init setup_per_cpu_areas(void) { }
 155
 156 static inline void *pcpu_lpage_remapped(void *kaddr)
 157 {
 158         return NULL;
 159 }
 160
 161 #endif /* CONFIG_SMP */
 162
 163 extern void __percpu *__alloc_percpu(size_t size, size_t align);
 164 extern void free_percpu(void __percpu *__pdata);
 165 extern phys_addr_t per_cpu_ptr_to_phys(void *addr);
 166
 167 #define alloc_percpu(type)      \
 168         (typeof(type) __percpu *)__alloc_percpu(sizeof(type), __alignof__(type))
 169
 170 /*
 171  * Optional methods for optimized non-lvalue per-cpu variable access.
 172  *
 173  * @var can be a percpu variable or a field of it and its size should
 174  * equal char, int or long.  percpu_read() evaluates to a lvalue and
 175  * all others to void.
 176  *
 177  * These operations are guaranteed to be atomic w.r.t. preemption.
 178  * The generic versions use plain get/put_cpu_var().  Archs are
 179  * encouraged to implement single-instruction alternatives which don't
 180  * require preemption protection.
 181  */
 182 #ifndef percpu_read
 183 # define percpu_read(var)                                               \
 184   ({                                                                    \
 185         typeof(var) *pr_ptr__ = &(var);                                 \
 186         typeof(var) pr_ret__;                                           \
 187         pr_ret__ = get_cpu_var(*pr_ptr__);                              \
 188         put_cpu_var(*pr_ptr__);                                         \
 189         pr_ret__;                                                       \
 190   })
 191 #endif
 192
 193 #define __percpu_generic_to_op(var, val, op)                            \
 194 do {                                                                    \
 195         typeof(var) *pgto_ptr__ = &(var);                               \
 196         get_cpu_var(*pgto_ptr__) op val;                                \
 197         put_cpu_var(*pgto_ptr__);                                       \
 198 } while (0)
 199
 200 #ifndef percpu_write
 201 # define percpu_write(var, val)         __percpu_generic_to_op(var, (val), =)
 202 #endif
 203
 204 #ifndef percpu_add
 205 # define percpu_add(var, val)           __percpu_generic_to_op(var, (val), +=)
 206 #endif
 207
 208 #ifndef percpu_sub
 209 # define percpu_sub(var, val)           __percpu_generic_to_op(var, (val), -=)
 210 #endif
 211
 212 #ifndef percpu_and
 213 # define percpu_and(var, val)           __percpu_generic_to_op(var, (val), &=)
 214 #endif
 215
 216 #ifndef percpu_or
 217 # define percpu_or(var, val)            __percpu_generic_to_op(var, (val), |=)
 218 #endif
 219
 220 #ifndef percpu_xor
 221 # define percpu_xor(var, val)           __percpu_generic_to_op(var, (val), ^=)
 222 #endif
 223
 224 /*
 225  * Branching function to split up a function into a set of functions that
 226  * are called for different scalar sizes of the objects handled.
 227  */
 228
 229 extern void __bad_size_call_parameter(void);
 230
 231 #define __pcpu_size_call_return(stem, variable)                         \
 232 ({      typeof(variable) pscr_ret__;                                    \
 233         __verify_pcpu_ptr(&(variable));                                 \
 234         switch(sizeof(variable)) {                                      \
 235         case 1: pscr_ret__ = stem##1(variable);break;                   \
 236         case 2: pscr_ret__ = stem##2(variable);break;                   \
 237         case 4: pscr_ret__ = stem##4(variable);break;                   \
 238         case 8: pscr_ret__ = stem##8(variable);break;                   \
 239         default:                                                        \
 240                 __bad_size_call_parameter();break;                      \
 241         }                                                               \
 242         pscr_ret__;                                                     \
 243 })
 244
 245 #define __pcpu_size_call(stem, variable, ...)                           \
 246 do {                                                                    \
 247         __verify_pcpu_ptr(&(variable));                                 \
 248         switch(sizeof(variable)) {                                      \
 249                 case 1: stem##1(variable, __VA_ARGS__);break;           \
 250                 case 2: stem##2(variable, __VA_ARGS__);break;           \
 251                 case 4: stem##4(variable, __VA_ARGS__);break;           \
 252                 case 8: stem##8(variable, __VA_ARGS__);break;           \
 253                 default:                                                \
 254                         __bad_size_call_parameter();break;              \
 255         }                                                               \
 256 } while (0)
 257
 258 /*
 259  * Optimized manipulation for memory allocated through the per cpu
 260  * allocator or for addresses of per cpu variables.
 261  *
 262  * These operation guarantee exclusivity of access for other operations
 263  * on the *same* processor. The assumption is that per cpu data is only
 264  * accessed by a single processor instance (the current one).
 265  *
 266  * The first group is used for accesses that must be done in a
 267  * preemption safe way since we know that the context is not preempt
 268  * safe. Interrupts may occur. If the interrupt modifies the variable
 269  * too then RMW actions will not be reliable.
 270  *
 271  * The arch code can provide optimized functions in two ways:
 272  *
 273  * 1. Override the function completely. F.e. define this_cpu_add().
 274  *    The arch must then ensure that the various scalar format passed
 275  *    are handled correctly.
 276  *
 277  * 2. Provide functions for certain scalar sizes. F.e. provide
 278  *    this_cpu_add_2() to provide per cpu atomic operations for 2 byte
 279  *    sized RMW actions. If arch code does not provide operations for
 280  *    a scalar size then the fallback in the generic code will be
 281  *    used.
 282  */
 283
 284 #define _this_cpu_generic_read(pcp)                                     \
 285 ({      typeof(pcp) ret__;                                              \
 286         preempt_disable();                                              \
 287         ret__ = *this_cpu_ptr(&(pcp));                                  \
 288         preempt_enable();                                               \
 289         ret__;                                                          \
 290 })
 291
 292 #ifndef this_cpu_read
 293 # ifndef this_cpu_read_1
 294 #  define this_cpu_read_1(pcp)  _this_cpu_generic_read(pcp)
 295 # endif
 296 # ifndef this_cpu_read_2
 297 #  define this_cpu_read_2(pcp)  _this_cpu_generic_read(pcp)
 298 # endif
 299 # ifndef this_cpu_read_4
 300 #  define this_cpu_read_4(pcp)  _this_cpu_generic_read(pcp)
 301 # endif
 302 # ifndef this_cpu_read_8
 303 #  define this_cpu_read_8(pcp)  _this_cpu_generic_read(pcp)
 304 # endif
 305 # define this_cpu_read(pcp)     __pcpu_size_call_return(this_cpu_read_, (pcp))
 306 #endif
 307
 308 #define _this_cpu_generic_to_op(pcp, val, op)                           \
 309 do {                                                                    \
 310         preempt_disable();                                              \
 311         *__this_cpu_ptr(&(pcp)) op val;                                 \
 312         preempt_enable();                                               \
 313 } while (0)
 314
 315 #ifndef this_cpu_write
 316 # ifndef this_cpu_write_1
 317 #  define this_cpu_write_1(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 318 # endif
 319 # ifndef this_cpu_write_2
 320 #  define this_cpu_write_2(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 321 # endif
 322 # ifndef this_cpu_write_4
 323 #  define this_cpu_write_4(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 324 # endif
 325 # ifndef this_cpu_write_8
 326 #  define this_cpu_write_8(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 327 # endif
 328 # define this_cpu_write(pcp, val)       __pcpu_size_call(this_cpu_write_, (pcp), (val))
 329 #endif
 330
 331 #ifndef this_cpu_add
 332 # ifndef this_cpu_add_1
 333 #  define this_cpu_add_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 334 # endif
 335 # ifndef this_cpu_add_2
 336 #  define this_cpu_add_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 337 # endif
 338 # ifndef this_cpu_add_4
 339 #  define this_cpu_add_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 340 # endif
 341 # ifndef this_cpu_add_8
 342 #  define this_cpu_add_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 343 # endif
 344 # define this_cpu_add(pcp, val)         __pcpu_size_call(this_cpu_add_, (pcp), (val))
 345 #endif
 346
 347 #ifndef this_cpu_sub
 348 # define this_cpu_sub(pcp, val)         this_cpu_add((pcp), -(val))
 349 #endif
 350
 351 #ifndef this_cpu_inc
 352 # define this_cpu_inc(pcp)              this_cpu_add((pcp), 1)
 353 #endif
 354
 355 #ifndef this_cpu_dec
 356 # define this_cpu_dec(pcp)              this_cpu_sub((pcp), 1)
 357 #endif
 358
 359 #ifndef this_cpu_and
 360 # ifndef this_cpu_and_1
 361 #  define this_cpu_and_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 362 # endif
 363 # ifndef this_cpu_and_2
 364 #  define this_cpu_and_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 365 # endif
 366 # ifndef this_cpu_and_4
 367 #  define this_cpu_and_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 368 # endif
 369 # ifndef this_cpu_and_8
 370 #  define this_cpu_and_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 371 # endif
 372 # define this_cpu_and(pcp, val)         __pcpu_size_call(this_cpu_and_, (pcp), (val))
 373 #endif
 374
 375 #ifndef this_cpu_or
 376 # ifndef this_cpu_or_1
 377 #  define this_cpu_or_1(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 378 # endif
 379 # ifndef this_cpu_or_2
 380 #  define this_cpu_or_2(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 381 # endif
 382 # ifndef this_cpu_or_4
 383 #  define this_cpu_or_4(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 384 # endif
 385 # ifndef this_cpu_or_8
 386 #  define this_cpu_or_8(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 387 # endif
 388 # define this_cpu_or(pcp, val)          __pcpu_size_call(this_cpu_or_, (pcp), (val))
 389 #endif
 390
 391 #ifndef this_cpu_xor
 392 # ifndef this_cpu_xor_1
 393 #  define this_cpu_xor_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 394 # endif
 395 # ifndef this_cpu_xor_2
 396 #  define this_cpu_xor_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 397 # endif
 398 # ifndef this_cpu_xor_4
 399 #  define this_cpu_xor_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 400 # endif
 401 # ifndef this_cpu_xor_8
 402 #  define this_cpu_xor_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 403 # endif
 404 # define this_cpu_xor(pcp, val)         __pcpu_size_call(this_cpu_or_, (pcp), (val))
 405 #endif
 406
 407 /*
 408  * Generic percpu operations that do not require preemption handling.
 409  * Either we do not care about races or the caller has the
 410  * responsibility of handling preemptions issues. Arch code can still
 411  * override these instructions since the arch per cpu code may be more
 412  * efficient and may actually get race freeness for free (that is the
 413  * case for x86 for example).
 414  *
 415  * If there is no other protection through preempt disable and/or
 416  * disabling interupts then one of these RMW operations can show unexpected
 417  * behavior because the execution thread was rescheduled on another processor
 418  * or an interrupt occurred and the same percpu variable was modified from
 419  * the interrupt context.
 420  */
 421 #ifndef __this_cpu_read
 422 # ifndef __this_cpu_read_1
 423 #  define __this_cpu_read_1(pcp)        (*__this_cpu_ptr(&(pcp)))
 424 # endif
 425 # ifndef __this_cpu_read_2
 426 #  define __this_cpu_read_2(pcp)        (*__this_cpu_ptr(&(pcp)))
 427 # endif
 428 # ifndef __this_cpu_read_4
 429 #  define __this_cpu_read_4(pcp)        (*__this_cpu_ptr(&(pcp)))
 430 # endif
 431 # ifndef __this_cpu_read_8
 432 #  define __this_cpu_read_8(pcp)        (*__this_cpu_ptr(&(pcp)))
 433 # endif
 434 # define __this_cpu_read(pcp)   __pcpu_size_call_return(__this_cpu_read_, (pcp))
 435 #endif
 436
 437 #define __this_cpu_generic_to_op(pcp, val, op)                          \
 438 do {                                                                    \
 439         *__this_cpu_ptr(&(pcp)) op val;                                 \
 440 } while (0)
 441
 442 #ifndef __this_cpu_write
 443 # ifndef __this_cpu_write_1
 444 #  define __this_cpu_write_1(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 445 # endif
 446 # ifndef __this_cpu_write_2
 447 #  define __this_cpu_write_2(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 448 # endif
 449 # ifndef __this_cpu_write_4
 450 #  define __this_cpu_write_4(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 451 # endif
 452 # ifndef __this_cpu_write_8
 453 #  define __this_cpu_write_8(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 454 # endif
 455 # define __this_cpu_write(pcp, val)     __pcpu_size_call(__this_cpu_write_, (pcp), (val))
 456 #endif
 457
 458 #ifndef __this_cpu_add
 459 # ifndef __this_cpu_add_1
 460 #  define __this_cpu_add_1(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 461 # endif
 462 # ifndef __this_cpu_add_2
 463 #  define __this_cpu_add_2(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 464 # endif
 465 # ifndef __this_cpu_add_4
 466 #  define __this_cpu_add_4(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 467 # endif
 468 # ifndef __this_cpu_add_8
 469 #  define __this_cpu_add_8(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 470 # endif
 471 # define __this_cpu_add(pcp, val)       __pcpu_size_call(__this_cpu_add_, (pcp), (val))
 472 #endif
 473
 474 #ifndef __this_cpu_sub
 475 # define __this_cpu_sub(pcp, val)       __this_cpu_add((pcp), -(val))
 476 #endif
 477
 478 #ifndef __this_cpu_inc
 479 # define __this_cpu_inc(pcp)            __this_cpu_add((pcp), 1)
 480 #endif
 481
 482 #ifndef __this_cpu_dec
 483 # define __this_cpu_dec(pcp)            __this_cpu_sub((pcp), 1)
 484 #endif
 485
 486 #ifndef __this_cpu_and
 487 # ifndef __this_cpu_and_1
 488 #  define __this_cpu_and_1(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 489 # endif
 490 # ifndef __this_cpu_and_2
 491 #  define __this_cpu_and_2(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 492 # endif
 493 # ifndef __this_cpu_and_4
 494 #  define __this_cpu_and_4(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 495 # endif
 496 # ifndef __this_cpu_and_8
 497 #  define __this_cpu_and_8(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 498 # endif
 499 # define __this_cpu_and(pcp, val)       __pcpu_size_call(__this_cpu_and_, (pcp), (val))
 500 #endif
 501
 502 #ifndef __this_cpu_or
 503 # ifndef __this_cpu_or_1
 504 #  define __this_cpu_or_1(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 505 # endif
 506 # ifndef __this_cpu_or_2
 507 #  define __this_cpu_or_2(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 508 # endif
 509 # ifndef __this_cpu_or_4
 510 #  define __this_cpu_or_4(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 511 # endif
 512 # ifndef __this_cpu_or_8
 513 #  define __this_cpu_or_8(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 514 # endif
 515 # define __this_cpu_or(pcp, val)        __pcpu_size_call(__this_cpu_or_, (pcp), (val))
 516 #endif
 517
 518 #ifndef __this_cpu_xor
 519 # ifndef __this_cpu_xor_1
 520 #  define __this_cpu_xor_1(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 521 # endif
 522 # ifndef __this_cpu_xor_2
 523 #  define __this_cpu_xor_2(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 524 # endif
 525 # ifndef __this_cpu_xor_4
 526 #  define __this_cpu_xor_4(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 527 # endif
 528 # ifndef __this_cpu_xor_8
 529 #  define __this_cpu_xor_8(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 530 # endif
 531 # define __this_cpu_xor(pcp, val)       __pcpu_size_call(__this_cpu_xor_, (pcp), (val))
 532 #endif
 533
 534 /*
 535  * IRQ safe versions of the per cpu RMW operations. Note that these operations
 536  * are *not* safe against modification of the same variable from another
 537  * processors (which one gets when using regular atomic operations)
 538  . They are guaranteed to be atomic vs. local interrupts and
 539  * preemption only.
 540  */
 541 #define irqsafe_cpu_generic_to_op(pcp, val, op)                         \
 542 do {                                                                    \
 543         unsigned long flags;                                            \
 544         local_irq_save(flags);                                          \
 545         *__this_cpu_ptr(&(pcp)) op val;                                 \
 546         local_irq_restore(flags);                                       \
 547 } while (0)
 548
 549 #ifndef irqsafe_cpu_add
 550 # ifndef irqsafe_cpu_add_1
 551 #  define irqsafe_cpu_add_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 552 # endif
 553 # ifndef irqsafe_cpu_add_2
 554 #  define irqsafe_cpu_add_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 555 # endif
 556 # ifndef irqsafe_cpu_add_4
 557 #  define irqsafe_cpu_add_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 558 # endif
 559 # ifndef irqsafe_cpu_add_8
 560 #  define irqsafe_cpu_add_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 561 # endif
 562 # define irqsafe_cpu_add(pcp, val) __pcpu_size_call(irqsafe_cpu_add_, (pcp), (val))
 563 #endif
 564
 565 #ifndef irqsafe_cpu_sub
 566 # define irqsafe_cpu_sub(pcp, val)      irqsafe_cpu_add((pcp), -(val))
 567 #endif
 568
 569 #ifndef irqsafe_cpu_inc
 570 # define irqsafe_cpu_inc(pcp)   irqsafe_cpu_add((pcp), 1)
 571 #endif
 572
 573 #ifndef irqsafe_cpu_dec
 574 # define irqsafe_cpu_dec(pcp)   irqsafe_cpu_sub((pcp), 1)
 575 #endif
 576
 577 #ifndef irqsafe_cpu_and
 578 # ifndef irqsafe_cpu_and_1
 579 #  define irqsafe_cpu_and_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 580 # endif
 581 # ifndef irqsafe_cpu_and_2
 582 #  define irqsafe_cpu_and_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 583 # endif
 584 # ifndef irqsafe_cpu_and_4
 585 #  define irqsafe_cpu_and_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 586 # endif
 587 # ifndef irqsafe_cpu_and_8
 588 #  define irqsafe_cpu_and_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 589 # endif
 590 # define irqsafe_cpu_and(pcp, val) __pcpu_size_call(irqsafe_cpu_and_, (val))
 591 #endif
 592
 593 #ifndef irqsafe_cpu_or
 594 # ifndef irqsafe_cpu_or_1
 595 #  define irqsafe_cpu_or_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 596 # endif
 597 # ifndef irqsafe_cpu_or_2
 598 #  define irqsafe_cpu_or_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 599 # endif
 600 # ifndef irqsafe_cpu_or_4
 601 #  define irqsafe_cpu_or_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 602 # endif
 603 # ifndef irqsafe_cpu_or_8
 604 #  define irqsafe_cpu_or_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 605 # endif
 606 # define irqsafe_cpu_or(pcp, val) __pcpu_size_call(irqsafe_cpu_or_, (val))
 607 #endif
 608
 609 #ifndef irqsafe_cpu_xor
 610 # ifndef irqsafe_cpu_xor_1
 611 #  define irqsafe_cpu_xor_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 612 # endif
 613 # ifndef irqsafe_cpu_xor_2
 614 #  define irqsafe_cpu_xor_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 615 # endif
 616 # ifndef irqsafe_cpu_xor_4
 617 #  define irqsafe_cpu_xor_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 618 # endif
 619 # ifndef irqsafe_cpu_xor_8
 620 #  define irqsafe_cpu_xor_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 621 # endif
 622 # define irqsafe_cpu_xor(pcp, val) __pcpu_size_call(irqsafe_cpu_xor_, (val))
 623 #endif
 624
 625 #endif /* __LINUX_PERCPU_H */