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_return2(stem, variable, ...)                   \
 244 ({                                                                      \
 245         typeof(variable) pscr2_ret__;                                   \
 246         __verify_pcpu_ptr(&(variable));                                 \
 247         switch(sizeof(variable)) {                                      \
 248         case 1: pscr2_ret__ = stem##1(variable, __VA_ARGS__); break;    \
 249         case 2: pscr2_ret__ = stem##2(variable, __VA_ARGS__); break;    \
 250         case 4: pscr2_ret__ = stem##4(variable, __VA_ARGS__); break;    \
 251         case 8: pscr2_ret__ = stem##8(variable, __VA_ARGS__); break;    \
 252         default:                                                        \
 253                 __bad_size_call_parameter(); break;                     \
 254         }                                                               \
 255         pscr2_ret__;                                                    \
 256 })
 257
 258 /*
 259  * Special handling for cmpxchg_double.  cmpxchg_double is passed two
 260  * percpu variables.  The first has to be aligned to a double word
 261  * boundary and the second has to follow directly thereafter.
 262  */
 263 #define __pcpu_double_call_return_bool(stem, pcp1, pcp2, ...)           \
 264 ({                                                                      \
 265         bool pdcrb_ret__;                                               \
 266         __verify_pcpu_ptr(&pcp1);                                       \
 267         BUILD_BUG_ON(sizeof(pcp1) != sizeof(pcp2));                     \
 268         VM_BUG_ON((unsigned long)(&pcp1) % (2 * sizeof(pcp1)));         \
 269         VM_BUG_ON((unsigned long)(&pcp2) !=                             \
 270                   (unsigned long)(&pcp1) + sizeof(pcp1));               \
 271         switch(sizeof(pcp1)) {                                          \
 272         case 1: pdcrb_ret__ = stem##1(pcp1, pcp2, __VA_ARGS__); break;  \
 273         case 2: pdcrb_ret__ = stem##2(pcp1, pcp2, __VA_ARGS__); break;  \
 274         case 4: pdcrb_ret__ = stem##4(pcp1, pcp2, __VA_ARGS__); break;  \
 275         case 8: pdcrb_ret__ = stem##8(pcp1, pcp2, __VA_ARGS__); break;  \
 276         default:                                                        \
 277                 __bad_size_call_parameter(); break;                     \
 278         }                                                               \
 279         pdcrb_ret__;                                                    \
 280 })
 281
 282 #define __pcpu_size_call(stem, variable, ...)                           \
 283 do {                                                                    \
 284         __verify_pcpu_ptr(&(variable));                                 \
 285         switch(sizeof(variable)) {                                      \
 286                 case 1: stem##1(variable, __VA_ARGS__);break;           \
 287                 case 2: stem##2(variable, __VA_ARGS__);break;           \
 288                 case 4: stem##4(variable, __VA_ARGS__);break;           \
 289                 case 8: stem##8(variable, __VA_ARGS__);break;           \
 290                 default:                                                \
 291                         __bad_size_call_parameter();break;              \
 292         }                                                               \
 293 } while (0)
 294
 295 /*
 296  * Optimized manipulation for memory allocated through the per cpu
 297  * allocator or for addresses of per cpu variables.
 298  *
 299  * These operation guarantee exclusivity of access for other operations
 300  * on the *same* processor. The assumption is that per cpu data is only
 301  * accessed by a single processor instance (the current one).
 302  *
 303  * The first group is used for accesses that must be done in a
 304  * preemption safe way since we know that the context is not preempt
 305  * safe. Interrupts may occur. If the interrupt modifies the variable
 306  * too then RMW actions will not be reliable.
 307  *
 308  * The arch code can provide optimized functions in two ways:
 309  *
 310  * 1. Override the function completely. F.e. define this_cpu_add().
 311  *    The arch must then ensure that the various scalar format passed
 312  *    are handled correctly.
 313  *
 314  * 2. Provide functions for certain scalar sizes. F.e. provide
 315  *    this_cpu_add_2() to provide per cpu atomic operations for 2 byte
 316  *    sized RMW actions. If arch code does not provide operations for
 317  *    a scalar size then the fallback in the generic code will be
 318  *    used.
 319  */
 320
 321 #define _this_cpu_generic_read(pcp)                                     \
 322 ({      typeof(pcp) ret__;                                              \
 323         preempt_disable();                                              \
 324         ret__ = *this_cpu_ptr(&(pcp));                                  \
 325         preempt_enable();                                               \
 326         ret__;                                                          \
 327 })
 328
 329 #ifndef this_cpu_read
 330 # ifndef this_cpu_read_1
 331 #  define this_cpu_read_1(pcp)  _this_cpu_generic_read(pcp)
 332 # endif
 333 # ifndef this_cpu_read_2
 334 #  define this_cpu_read_2(pcp)  _this_cpu_generic_read(pcp)
 335 # endif
 336 # ifndef this_cpu_read_4
 337 #  define this_cpu_read_4(pcp)  _this_cpu_generic_read(pcp)
 338 # endif
 339 # ifndef this_cpu_read_8
 340 #  define this_cpu_read_8(pcp)  _this_cpu_generic_read(pcp)
 341 # endif
 342 # define this_cpu_read(pcp)     __pcpu_size_call_return(this_cpu_read_, (pcp))
 343 #endif
 344
 345 #define _this_cpu_generic_to_op(pcp, val, op)                           \
 346 do {                                                                    \
 347         preempt_disable();                                              \
 348         *__this_cpu_ptr(&(pcp)) op val;                                 \
 349         preempt_enable();                                               \
 350 } while (0)
 351
 352 #ifndef this_cpu_write
 353 # ifndef this_cpu_write_1
 354 #  define this_cpu_write_1(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 355 # endif
 356 # ifndef this_cpu_write_2
 357 #  define this_cpu_write_2(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 358 # endif
 359 # ifndef this_cpu_write_4
 360 #  define this_cpu_write_4(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 361 # endif
 362 # ifndef this_cpu_write_8
 363 #  define this_cpu_write_8(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 364 # endif
 365 # define this_cpu_write(pcp, val)       __pcpu_size_call(this_cpu_write_, (pcp), (val))
 366 #endif
 367
 368 #ifndef this_cpu_add
 369 # ifndef this_cpu_add_1
 370 #  define this_cpu_add_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 371 # endif
 372 # ifndef this_cpu_add_2
 373 #  define this_cpu_add_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 374 # endif
 375 # ifndef this_cpu_add_4
 376 #  define this_cpu_add_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 377 # endif
 378 # ifndef this_cpu_add_8
 379 #  define this_cpu_add_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 380 # endif
 381 # define this_cpu_add(pcp, val)         __pcpu_size_call(this_cpu_add_, (pcp), (val))
 382 #endif
 383
 384 #ifndef this_cpu_sub
 385 # define this_cpu_sub(pcp, val)         this_cpu_add((pcp), -(val))
 386 #endif
 387
 388 #ifndef this_cpu_inc
 389 # define this_cpu_inc(pcp)              this_cpu_add((pcp), 1)
 390 #endif
 391
 392 #ifndef this_cpu_dec
 393 # define this_cpu_dec(pcp)              this_cpu_sub((pcp), 1)
 394 #endif
 395
 396 #ifndef this_cpu_and
 397 # ifndef this_cpu_and_1
 398 #  define this_cpu_and_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 399 # endif
 400 # ifndef this_cpu_and_2
 401 #  define this_cpu_and_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 402 # endif
 403 # ifndef this_cpu_and_4
 404 #  define this_cpu_and_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 405 # endif
 406 # ifndef this_cpu_and_8
 407 #  define this_cpu_and_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 408 # endif
 409 # define this_cpu_and(pcp, val)         __pcpu_size_call(this_cpu_and_, (pcp), (val))
 410 #endif
 411
 412 #ifndef this_cpu_or
 413 # ifndef this_cpu_or_1
 414 #  define this_cpu_or_1(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 415 # endif
 416 # ifndef this_cpu_or_2
 417 #  define this_cpu_or_2(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 418 # endif
 419 # ifndef this_cpu_or_4
 420 #  define this_cpu_or_4(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 421 # endif
 422 # ifndef this_cpu_or_8
 423 #  define this_cpu_or_8(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 424 # endif
 425 # define this_cpu_or(pcp, val)          __pcpu_size_call(this_cpu_or_, (pcp), (val))
 426 #endif
 427
 428 #ifndef this_cpu_xor
 429 # ifndef this_cpu_xor_1
 430 #  define this_cpu_xor_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 431 # endif
 432 # ifndef this_cpu_xor_2
 433 #  define this_cpu_xor_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 434 # endif
 435 # ifndef this_cpu_xor_4
 436 #  define this_cpu_xor_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 437 # endif
 438 # ifndef this_cpu_xor_8
 439 #  define this_cpu_xor_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 440 # endif
 441 # define this_cpu_xor(pcp, val)         __pcpu_size_call(this_cpu_or_, (pcp), (val))
 442 #endif
 443
 444 #define _this_cpu_generic_add_return(pcp, val)                          \
 445 ({                                                                      \
 446         typeof(pcp) ret__;                                              \
 447         preempt_disable();                                              \
 448         __this_cpu_add(pcp, val);                                       \
 449         ret__ = __this_cpu_read(pcp);                                   \
 450         preempt_enable();                                               \
 451         ret__;                                                          \
 452 })
 453
 454 #ifndef this_cpu_add_return
 455 # ifndef this_cpu_add_return_1
 456 #  define this_cpu_add_return_1(pcp, val)       _this_cpu_generic_add_return(pcp, val)
 457 # endif
 458 # ifndef this_cpu_add_return_2
 459 #  define this_cpu_add_return_2(pcp, val)       _this_cpu_generic_add_return(pcp, val)
 460 # endif
 461 # ifndef this_cpu_add_return_4
 462 #  define this_cpu_add_return_4(pcp, val)       _this_cpu_generic_add_return(pcp, val)
 463 # endif
 464 # ifndef this_cpu_add_return_8
 465 #  define this_cpu_add_return_8(pcp, val)       _this_cpu_generic_add_return(pcp, val)
 466 # endif
 467 # define this_cpu_add_return(pcp, val)  __pcpu_size_call_return2(this_cpu_add_return_, pcp, val)
 468 #endif
 469
 470 #define this_cpu_sub_return(pcp, val)   this_cpu_add_return(pcp, -(val))
 471 #define this_cpu_inc_return(pcp)        this_cpu_add_return(pcp, 1)
 472 #define this_cpu_dec_return(pcp)        this_cpu_add_return(pcp, -1)
 473
 474 #define _this_cpu_generic_xchg(pcp, nval)                               \
 475 ({      typeof(pcp) ret__;                                              \
 476         preempt_disable();                                              \
 477         ret__ = __this_cpu_read(pcp);                                   \
 478         __this_cpu_write(pcp, nval);                                    \
 479         preempt_enable();                                               \
 480         ret__;                                                          \
 481 })
 482
 483 #ifndef this_cpu_xchg
 484 # ifndef this_cpu_xchg_1
 485 #  define this_cpu_xchg_1(pcp, nval)    _this_cpu_generic_xchg(pcp, nval)
 486 # endif
 487 # ifndef this_cpu_xchg_2
 488 #  define this_cpu_xchg_2(pcp, nval)    _this_cpu_generic_xchg(pcp, nval)
 489 # endif
 490 # ifndef this_cpu_xchg_4
 491 #  define this_cpu_xchg_4(pcp, nval)    _this_cpu_generic_xchg(pcp, nval)
 492 # endif
 493 # ifndef this_cpu_xchg_8
 494 #  define this_cpu_xchg_8(pcp, nval)    _this_cpu_generic_xchg(pcp, nval)
 495 # endif
 496 # define this_cpu_xchg(pcp, nval)       \
 497         __pcpu_size_call_return2(this_cpu_xchg_, (pcp), nval)
 498 #endif
 499
 500 #define _this_cpu_generic_cmpxchg(pcp, oval, nval)                      \
 501 ({      typeof(pcp) ret__;                                              \
 502         preempt_disable();                                              \
 503         ret__ = __this_cpu_read(pcp);                                   \
 504         if (ret__ == (oval))                                            \
 505                 __this_cpu_write(pcp, nval);                            \
 506         preempt_enable();                                               \
 507         ret__;                                                          \
 508 })
 509
 510 #ifndef this_cpu_cmpxchg
 511 # ifndef this_cpu_cmpxchg_1
 512 #  define this_cpu_cmpxchg_1(pcp, oval, nval)   _this_cpu_generic_cmpxchg(pcp, oval, nval)
 513 # endif
 514 # ifndef this_cpu_cmpxchg_2
 515 #  define this_cpu_cmpxchg_2(pcp, oval, nval)   _this_cpu_generic_cmpxchg(pcp, oval, nval)
 516 # endif
 517 # ifndef this_cpu_cmpxchg_4
 518 #  define this_cpu_cmpxchg_4(pcp, oval, nval)   _this_cpu_generic_cmpxchg(pcp, oval, nval)
 519 # endif
 520 # ifndef this_cpu_cmpxchg_8
 521 #  define this_cpu_cmpxchg_8(pcp, oval, nval)   _this_cpu_generic_cmpxchg(pcp, oval, nval)
 522 # endif
 523 # define this_cpu_cmpxchg(pcp, oval, nval)      \
 524         __pcpu_size_call_return2(this_cpu_cmpxchg_, pcp, oval, nval)
 525 #endif
 526
 527 /*
 528  * cmpxchg_double replaces two adjacent scalars at once.  The first
 529  * two parameters are per cpu variables which have to be of the same
 530  * size.  A truth value is returned to indicate success or failure
 531  * (since a double register result is difficult to handle).  There is
 532  * very limited hardware support for these operations, so only certain
 533  * sizes may work.
 534  */
 535 #define _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)        \
 536 ({                                                                      \
 537         int ret__;                                                      \
 538         preempt_disable();                                              \
 539         ret__ = __this_cpu_generic_cmpxchg_double(pcp1, pcp2,           \
 540                         oval1, oval2, nval1, nval2);                    \
 541         preempt_enable();                                               \
 542         ret__;                                                          \
 543 })
 544
 545 #ifndef this_cpu_cmpxchg_double
 546 # ifndef this_cpu_cmpxchg_double_1
 547 #  define this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2)     \
 548         _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 549 # endif
 550 # ifndef this_cpu_cmpxchg_double_2
 551 #  define this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2)     \
 552         _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 553 # endif
 554 # ifndef this_cpu_cmpxchg_double_4
 555 #  define this_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2)     \
 556         _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 557 # endif
 558 # ifndef this_cpu_cmpxchg_double_8
 559 #  define this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2)     \
 560         _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 561 # endif
 562 # define this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)        \
 563         __pcpu_double_call_return_bool(this_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2))
 564 #endif
 565
 566 /*
 567  * Generic percpu operations that do not require preemption handling.
 568  * Either we do not care about races or the caller has the
 569  * responsibility of handling preemptions issues. Arch code can still
 570  * override these instructions since the arch per cpu code may be more
 571  * efficient and may actually get race freeness for free (that is the
 572  * case for x86 for example).
 573  *
 574  * If there is no other protection through preempt disable and/or
 575  * disabling interupts then one of these RMW operations can show unexpected
 576  * behavior because the execution thread was rescheduled on another processor
 577  * or an interrupt occurred and the same percpu variable was modified from
 578  * the interrupt context.
 579  */
 580 #ifndef __this_cpu_read
 581 # ifndef __this_cpu_read_1
 582 #  define __this_cpu_read_1(pcp)        (*__this_cpu_ptr(&(pcp)))
 583 # endif
 584 # ifndef __this_cpu_read_2
 585 #  define __this_cpu_read_2(pcp)        (*__this_cpu_ptr(&(pcp)))
 586 # endif
 587 # ifndef __this_cpu_read_4
 588 #  define __this_cpu_read_4(pcp)        (*__this_cpu_ptr(&(pcp)))
 589 # endif
 590 # ifndef __this_cpu_read_8
 591 #  define __this_cpu_read_8(pcp)        (*__this_cpu_ptr(&(pcp)))
 592 # endif
 593 # define __this_cpu_read(pcp)   __pcpu_size_call_return(__this_cpu_read_, (pcp))
 594 #endif
 595
 596 #define __this_cpu_generic_to_op(pcp, val, op)                          \
 597 do {                                                                    \
 598         *__this_cpu_ptr(&(pcp)) op val;                                 \
 599 } while (0)
 600
 601 #ifndef __this_cpu_write
 602 # ifndef __this_cpu_write_1
 603 #  define __this_cpu_write_1(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 604 # endif
 605 # ifndef __this_cpu_write_2
 606 #  define __this_cpu_write_2(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 607 # endif
 608 # ifndef __this_cpu_write_4
 609 #  define __this_cpu_write_4(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 610 # endif
 611 # ifndef __this_cpu_write_8
 612 #  define __this_cpu_write_8(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 613 # endif
 614 # define __this_cpu_write(pcp, val)     __pcpu_size_call(__this_cpu_write_, (pcp), (val))
 615 #endif
 616
 617 #ifndef __this_cpu_add
 618 # ifndef __this_cpu_add_1
 619 #  define __this_cpu_add_1(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 620 # endif
 621 # ifndef __this_cpu_add_2
 622 #  define __this_cpu_add_2(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 623 # endif
 624 # ifndef __this_cpu_add_4
 625 #  define __this_cpu_add_4(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 626 # endif
 627 # ifndef __this_cpu_add_8
 628 #  define __this_cpu_add_8(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 629 # endif
 630 # define __this_cpu_add(pcp, val)       __pcpu_size_call(__this_cpu_add_, (pcp), (val))
 631 #endif
 632
 633 #ifndef __this_cpu_sub
 634 # define __this_cpu_sub(pcp, val)       __this_cpu_add((pcp), -(val))
 635 #endif
 636
 637 #ifndef __this_cpu_inc
 638 # define __this_cpu_inc(pcp)            __this_cpu_add((pcp), 1)
 639 #endif
 640
 641 #ifndef __this_cpu_dec
 642 # define __this_cpu_dec(pcp)            __this_cpu_sub((pcp), 1)
 643 #endif
 644
 645 #ifndef __this_cpu_and
 646 # ifndef __this_cpu_and_1
 647 #  define __this_cpu_and_1(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 648 # endif
 649 # ifndef __this_cpu_and_2
 650 #  define __this_cpu_and_2(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 651 # endif
 652 # ifndef __this_cpu_and_4
 653 #  define __this_cpu_and_4(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 654 # endif
 655 # ifndef __this_cpu_and_8
 656 #  define __this_cpu_and_8(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 657 # endif
 658 # define __this_cpu_and(pcp, val)       __pcpu_size_call(__this_cpu_and_, (pcp), (val))
 659 #endif
 660
 661 #ifndef __this_cpu_or
 662 # ifndef __this_cpu_or_1
 663 #  define __this_cpu_or_1(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 664 # endif
 665 # ifndef __this_cpu_or_2
 666 #  define __this_cpu_or_2(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 667 # endif
 668 # ifndef __this_cpu_or_4
 669 #  define __this_cpu_or_4(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 670 # endif
 671 # ifndef __this_cpu_or_8
 672 #  define __this_cpu_or_8(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 673 # endif
 674 # define __this_cpu_or(pcp, val)        __pcpu_size_call(__this_cpu_or_, (pcp), (val))
 675 #endif
 676
 677 #ifndef __this_cpu_xor
 678 # ifndef __this_cpu_xor_1
 679 #  define __this_cpu_xor_1(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 680 # endif
 681 # ifndef __this_cpu_xor_2
 682 #  define __this_cpu_xor_2(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 683 # endif
 684 # ifndef __this_cpu_xor_4
 685 #  define __this_cpu_xor_4(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 686 # endif
 687 # ifndef __this_cpu_xor_8
 688 #  define __this_cpu_xor_8(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 689 # endif
 690 # define __this_cpu_xor(pcp, val)       __pcpu_size_call(__this_cpu_xor_, (pcp), (val))
 691 #endif
 692
 693 #define __this_cpu_generic_add_return(pcp, val)                         \
 694 ({                                                                      \
 695         __this_cpu_add(pcp, val);                                       \
 696         __this_cpu_read(pcp);                                           \
 697 })
 698
 699 #ifndef __this_cpu_add_return
 700 # ifndef __this_cpu_add_return_1
 701 #  define __this_cpu_add_return_1(pcp, val)     __this_cpu_generic_add_return(pcp, val)
 702 # endif
 703 # ifndef __this_cpu_add_return_2
 704 #  define __this_cpu_add_return_2(pcp, val)     __this_cpu_generic_add_return(pcp, val)
 705 # endif
 706 # ifndef __this_cpu_add_return_4
 707 #  define __this_cpu_add_return_4(pcp, val)     __this_cpu_generic_add_return(pcp, val)
 708 # endif
 709 # ifndef __this_cpu_add_return_8
 710 #  define __this_cpu_add_return_8(pcp, val)     __this_cpu_generic_add_return(pcp, val)
 711 # endif
 712 # define __this_cpu_add_return(pcp, val)        __pcpu_size_call_return2(this_cpu_add_return_, pcp, val)
 713 #endif
 714
 715 #define __this_cpu_sub_return(pcp, val) this_cpu_add_return(pcp, -(val))
 716 #define __this_cpu_inc_return(pcp)      this_cpu_add_return(pcp, 1)
 717 #define __this_cpu_dec_return(pcp)      this_cpu_add_return(pcp, -1)
 718
 719 #define __this_cpu_generic_xchg(pcp, nval)                              \
 720 ({      typeof(pcp) ret__;                                              \
 721         ret__ = __this_cpu_read(pcp);                                   \
 722         __this_cpu_write(pcp, nval);                                    \
 723         ret__;                                                          \
 724 })
 725
 726 #ifndef __this_cpu_xchg
 727 # ifndef __this_cpu_xchg_1
 728 #  define __this_cpu_xchg_1(pcp, nval)  __this_cpu_generic_xchg(pcp, nval)
 729 # endif
 730 # ifndef __this_cpu_xchg_2
 731 #  define __this_cpu_xchg_2(pcp, nval)  __this_cpu_generic_xchg(pcp, nval)
 732 # endif
 733 # ifndef __this_cpu_xchg_4
 734 #  define __this_cpu_xchg_4(pcp, nval)  __this_cpu_generic_xchg(pcp, nval)
 735 # endif
 736 # ifndef __this_cpu_xchg_8
 737 #  define __this_cpu_xchg_8(pcp, nval)  __this_cpu_generic_xchg(pcp, nval)
 738 # endif
 739 # define __this_cpu_xchg(pcp, nval)     \
 740         __pcpu_size_call_return2(__this_cpu_xchg_, (pcp), nval)
 741 #endif
 742
 743 #define __this_cpu_generic_cmpxchg(pcp, oval, nval)                     \
 744 ({                                                                      \
 745         typeof(pcp) ret__;                                              \
 746         ret__ = __this_cpu_read(pcp);                                   \
 747         if (ret__ == (oval))                                            \
 748                 __this_cpu_write(pcp, nval);                            \
 749         ret__;                                                          \
 750 })
 751
 752 #ifndef __this_cpu_cmpxchg
 753 # ifndef __this_cpu_cmpxchg_1
 754 #  define __this_cpu_cmpxchg_1(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval)
 755 # endif
 756 # ifndef __this_cpu_cmpxchg_2
 757 #  define __this_cpu_cmpxchg_2(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval)
 758 # endif
 759 # ifndef __this_cpu_cmpxchg_4
 760 #  define __this_cpu_cmpxchg_4(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval)
 761 # endif
 762 # ifndef __this_cpu_cmpxchg_8
 763 #  define __this_cpu_cmpxchg_8(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval)
 764 # endif
 765 # define __this_cpu_cmpxchg(pcp, oval, nval)    \
 766         __pcpu_size_call_return2(__this_cpu_cmpxchg_, pcp, oval, nval)
 767 #endif
 768
 769 #define __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)       \
 770 ({                                                                      \
 771         int __ret = 0;                                                  \
 772         if (__this_cpu_read(pcp1) == (oval1) &&                         \
 773                          __this_cpu_read(pcp2)  == (oval2)) {           \
 774                 __this_cpu_write(pcp1, (nval1));                        \
 775                 __this_cpu_write(pcp2, (nval2));                        \
 776                 __ret = 1;                                              \
 777         }                                                               \
 778         (__ret);                                                        \
 779 })
 780
 781 #ifndef __this_cpu_cmpxchg_double
 782 # ifndef __this_cpu_cmpxchg_double_1
 783 #  define __this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2)   \
 784         __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 785 # endif
 786 # ifndef __this_cpu_cmpxchg_double_2
 787 #  define __this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2)   \
 788         __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 789 # endif
 790 # ifndef __this_cpu_cmpxchg_double_4
 791 #  define __this_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2)   \
 792         __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 793 # endif
 794 # ifndef __this_cpu_cmpxchg_double_8
 795 #  define __this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2)   \
 796         __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 797 # endif
 798 # define __this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)      \
 799         __pcpu_double_call_return_bool(__this_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2))
 800 #endif
 801
 802 /*
 803  * IRQ safe versions of the per cpu RMW operations. Note that these operations
 804  * are *not* safe against modification of the same variable from another
 805  * processors (which one gets when using regular atomic operations)
 806  * They are guaranteed to be atomic vs. local interrupts and
 807  * preemption only.
 808  */
 809 #define irqsafe_cpu_generic_to_op(pcp, val, op)                         \
 810 do {                                                                    \
 811         unsigned long flags;                                            \
 812         local_irq_save(flags);                                          \
 813         *__this_cpu_ptr(&(pcp)) op val;                                 \
 814         local_irq_restore(flags);                                       \
 815 } while (0)
 816
 817 #ifndef irqsafe_cpu_add
 818 # ifndef irqsafe_cpu_add_1
 819 #  define irqsafe_cpu_add_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 820 # endif
 821 # ifndef irqsafe_cpu_add_2
 822 #  define irqsafe_cpu_add_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 823 # endif
 824 # ifndef irqsafe_cpu_add_4
 825 #  define irqsafe_cpu_add_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 826 # endif
 827 # ifndef irqsafe_cpu_add_8
 828 #  define irqsafe_cpu_add_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 829 # endif
 830 # define irqsafe_cpu_add(pcp, val) __pcpu_size_call(irqsafe_cpu_add_, (pcp), (val))
 831 #endif
 832
 833 #ifndef irqsafe_cpu_sub
 834 # define irqsafe_cpu_sub(pcp, val)      irqsafe_cpu_add((pcp), -(val))
 835 #endif
 836
 837 #ifndef irqsafe_cpu_inc
 838 # define irqsafe_cpu_inc(pcp)   irqsafe_cpu_add((pcp), 1)
 839 #endif
 840
 841 #ifndef irqsafe_cpu_dec
 842 # define irqsafe_cpu_dec(pcp)   irqsafe_cpu_sub((pcp), 1)
 843 #endif
 844
 845 #ifndef irqsafe_cpu_and
 846 # ifndef irqsafe_cpu_and_1
 847 #  define irqsafe_cpu_and_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 848 # endif
 849 # ifndef irqsafe_cpu_and_2
 850 #  define irqsafe_cpu_and_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 851 # endif
 852 # ifndef irqsafe_cpu_and_4
 853 #  define irqsafe_cpu_and_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 854 # endif
 855 # ifndef irqsafe_cpu_and_8
 856 #  define irqsafe_cpu_and_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 857 # endif
 858 # define irqsafe_cpu_and(pcp, val) __pcpu_size_call(irqsafe_cpu_and_, (val))
 859 #endif
 860
 861 #ifndef irqsafe_cpu_or
 862 # ifndef irqsafe_cpu_or_1
 863 #  define irqsafe_cpu_or_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 864 # endif
 865 # ifndef irqsafe_cpu_or_2
 866 #  define irqsafe_cpu_or_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 867 # endif
 868 # ifndef irqsafe_cpu_or_4
 869 #  define irqsafe_cpu_or_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 870 # endif
 871 # ifndef irqsafe_cpu_or_8
 872 #  define irqsafe_cpu_or_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 873 # endif
 874 # define irqsafe_cpu_or(pcp, val) __pcpu_size_call(irqsafe_cpu_or_, (val))
 875 #endif
 876
 877 #ifndef irqsafe_cpu_xor
 878 # ifndef irqsafe_cpu_xor_1
 879 #  define irqsafe_cpu_xor_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 880 # endif
 881 # ifndef irqsafe_cpu_xor_2
 882 #  define irqsafe_cpu_xor_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 883 # endif
 884 # ifndef irqsafe_cpu_xor_4
 885 #  define irqsafe_cpu_xor_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 886 # endif
 887 # ifndef irqsafe_cpu_xor_8
 888 #  define irqsafe_cpu_xor_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 889 # endif
 890 # define irqsafe_cpu_xor(pcp, val) __pcpu_size_call(irqsafe_cpu_xor_, (val))
 891 #endif
 892
 893 #define irqsafe_cpu_generic_cmpxchg(pcp, oval, nval)                    \
 894 ({                                                                      \
 895         typeof(pcp) ret__;                                              \
 896         unsigned long flags;                                            \
 897         local_irq_save(flags);                                          \
 898         ret__ = __this_cpu_read(pcp);                                   \
 899         if (ret__ == (oval))                                            \
 900                 __this_cpu_write(pcp, nval);                            \
 901         local_irq_restore(flags);                                       \
 902         ret__;                                                          \
 903 })
 904
 905 #ifndef irqsafe_cpu_cmpxchg
 906 # ifndef irqsafe_cpu_cmpxchg_1
 907 #  define irqsafe_cpu_cmpxchg_1(pcp, oval, nval)        irqsafe_cpu_generic_cmpxchg(pcp, oval, nval)
 908 # endif
 909 # ifndef irqsafe_cpu_cmpxchg_2
 910 #  define irqsafe_cpu_cmpxchg_2(pcp, oval, nval)        irqsafe_cpu_generic_cmpxchg(pcp, oval, nval)
 911 # endif
 912 # ifndef irqsafe_cpu_cmpxchg_4
 913 #  define irqsafe_cpu_cmpxchg_4(pcp, oval, nval)        irqsafe_cpu_generic_cmpxchg(pcp, oval, nval)
 914 # endif
 915 # ifndef irqsafe_cpu_cmpxchg_8
 916 #  define irqsafe_cpu_cmpxchg_8(pcp, oval, nval)        irqsafe_cpu_generic_cmpxchg(pcp, oval, nval)
 917 # endif
 918 # define irqsafe_cpu_cmpxchg(pcp, oval, nval)           \
 919         __pcpu_size_call_return2(irqsafe_cpu_cmpxchg_, (pcp), oval, nval)
 920 #endif
 921
 922 #define irqsafe_generic_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)      \
 923 ({                                                                      \
 924         int ret__;                                                      \
 925         unsigned long flags;                                            \
 926         local_irq_save(flags);                                          \
 927         ret__ = __this_cpu_generic_cmpxchg_double(pcp1, pcp2,           \
 928                         oval1, oval2, nval1, nval2);                    \
 929         local_irq_restore(flags);                                       \
 930         ret__;                                                          \
 931 })
 932
 933 #ifndef irqsafe_cpu_cmpxchg_double
 934 # ifndef irqsafe_cpu_cmpxchg_double_1
 935 #  define irqsafe_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2)  \
 936         irqsafe_generic_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 937 # endif
 938 # ifndef irqsafe_cpu_cmpxchg_double_2
 939 #  define irqsafe_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2)  \
 940         irqsafe_generic_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 941 # endif
 942 # ifndef irqsafe_cpu_cmpxchg_double_4
 943 #  define irqsafe_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2)  \
 944         irqsafe_generic_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 945 # endif
 946 # ifndef irqsafe_cpu_cmpxchg_double_8
 947 #  define irqsafe_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2)  \
 948         irqsafe_generic_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 949 # endif
 950 # define irqsafe_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)     \
 951         __pcpu_double_call_return_int(irqsafe_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2))
 952 #endif
 953
 954 #endif /* __LINUX_PERCPU_H */