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