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 #define __pcpu_size_call(stem, variable, ...)                           \
 259 do {                                                                    \
 260         __verify_pcpu_ptr(&(variable));                                 \
 261         switch(sizeof(variable)) {                                      \
 262                 case 1: stem##1(variable, __VA_ARGS__);break;           \
 263                 case 2: stem##2(variable, __VA_ARGS__);break;           \
 264                 case 4: stem##4(variable, __VA_ARGS__);break;           \
 265                 case 8: stem##8(variable, __VA_ARGS__);break;           \
 266                 default:                                                \
 267                         __bad_size_call_parameter();break;              \
 268         }                                                               \
 269 } while (0)
 270
 271 /*
 272  * Optimized manipulation for memory allocated through the per cpu
 273  * allocator or for addresses of per cpu variables.
 274  *
 275  * These operation guarantee exclusivity of access for other operations
 276  * on the *same* processor. The assumption is that per cpu data is only
 277  * accessed by a single processor instance (the current one).
 278  *
 279  * The first group is used for accesses that must be done in a
 280  * preemption safe way since we know that the context is not preempt
 281  * safe. Interrupts may occur. If the interrupt modifies the variable
 282  * too then RMW actions will not be reliable.
 283  *
 284  * The arch code can provide optimized functions in two ways:
 285  *
 286  * 1. Override the function completely. F.e. define this_cpu_add().
 287  *    The arch must then ensure that the various scalar format passed
 288  *    are handled correctly.
 289  *
 290  * 2. Provide functions for certain scalar sizes. F.e. provide
 291  *    this_cpu_add_2() to provide per cpu atomic operations for 2 byte
 292  *    sized RMW actions. If arch code does not provide operations for
 293  *    a scalar size then the fallback in the generic code will be
 294  *    used.
 295  */
 296
 297 #define _this_cpu_generic_read(pcp)                                     \
 298 ({      typeof(pcp) ret__;                                              \
 299         preempt_disable();                                              \
 300         ret__ = *this_cpu_ptr(&(pcp));                                  \
 301         preempt_enable();                                               \
 302         ret__;                                                          \
 303 })
 304
 305 #ifndef this_cpu_read
 306 # ifndef this_cpu_read_1
 307 #  define this_cpu_read_1(pcp)  _this_cpu_generic_read(pcp)
 308 # endif
 309 # ifndef this_cpu_read_2
 310 #  define this_cpu_read_2(pcp)  _this_cpu_generic_read(pcp)
 311 # endif
 312 # ifndef this_cpu_read_4
 313 #  define this_cpu_read_4(pcp)  _this_cpu_generic_read(pcp)
 314 # endif
 315 # ifndef this_cpu_read_8
 316 #  define this_cpu_read_8(pcp)  _this_cpu_generic_read(pcp)
 317 # endif
 318 # define this_cpu_read(pcp)     __pcpu_size_call_return(this_cpu_read_, (pcp))
 319 #endif
 320
 321 #define _this_cpu_generic_to_op(pcp, val, op)                           \
 322 do {                                                                    \
 323         preempt_disable();                                              \
 324         *__this_cpu_ptr(&(pcp)) op val;                                 \
 325         preempt_enable();                                               \
 326 } while (0)
 327
 328 #ifndef this_cpu_write
 329 # ifndef this_cpu_write_1
 330 #  define this_cpu_write_1(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 331 # endif
 332 # ifndef this_cpu_write_2
 333 #  define this_cpu_write_2(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 334 # endif
 335 # ifndef this_cpu_write_4
 336 #  define this_cpu_write_4(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 337 # endif
 338 # ifndef this_cpu_write_8
 339 #  define this_cpu_write_8(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 340 # endif
 341 # define this_cpu_write(pcp, val)       __pcpu_size_call(this_cpu_write_, (pcp), (val))
 342 #endif
 343
 344 #ifndef this_cpu_add
 345 # ifndef this_cpu_add_1
 346 #  define this_cpu_add_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 347 # endif
 348 # ifndef this_cpu_add_2
 349 #  define this_cpu_add_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 350 # endif
 351 # ifndef this_cpu_add_4
 352 #  define this_cpu_add_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 353 # endif
 354 # ifndef this_cpu_add_8
 355 #  define this_cpu_add_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 356 # endif
 357 # define this_cpu_add(pcp, val)         __pcpu_size_call(this_cpu_add_, (pcp), (val))
 358 #endif
 359
 360 #ifndef this_cpu_sub
 361 # define this_cpu_sub(pcp, val)         this_cpu_add((pcp), -(val))
 362 #endif
 363
 364 #ifndef this_cpu_inc
 365 # define this_cpu_inc(pcp)              this_cpu_add((pcp), 1)
 366 #endif
 367
 368 #ifndef this_cpu_dec
 369 # define this_cpu_dec(pcp)              this_cpu_sub((pcp), 1)
 370 #endif
 371
 372 #ifndef this_cpu_and
 373 # ifndef this_cpu_and_1
 374 #  define this_cpu_and_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 375 # endif
 376 # ifndef this_cpu_and_2
 377 #  define this_cpu_and_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 378 # endif
 379 # ifndef this_cpu_and_4
 380 #  define this_cpu_and_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 381 # endif
 382 # ifndef this_cpu_and_8
 383 #  define this_cpu_and_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 384 # endif
 385 # define this_cpu_and(pcp, val)         __pcpu_size_call(this_cpu_and_, (pcp), (val))
 386 #endif
 387
 388 #ifndef this_cpu_or
 389 # ifndef this_cpu_or_1
 390 #  define this_cpu_or_1(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 391 # endif
 392 # ifndef this_cpu_or_2
 393 #  define this_cpu_or_2(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 394 # endif
 395 # ifndef this_cpu_or_4
 396 #  define this_cpu_or_4(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 397 # endif
 398 # ifndef this_cpu_or_8
 399 #  define this_cpu_or_8(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 400 # endif
 401 # define this_cpu_or(pcp, val)          __pcpu_size_call(this_cpu_or_, (pcp), (val))
 402 #endif
 403
 404 #ifndef this_cpu_xor
 405 # ifndef this_cpu_xor_1
 406 #  define this_cpu_xor_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 407 # endif
 408 # ifndef this_cpu_xor_2
 409 #  define this_cpu_xor_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 410 # endif
 411 # ifndef this_cpu_xor_4
 412 #  define this_cpu_xor_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 413 # endif
 414 # ifndef this_cpu_xor_8
 415 #  define this_cpu_xor_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 416 # endif
 417 # define this_cpu_xor(pcp, val)         __pcpu_size_call(this_cpu_or_, (pcp), (val))
 418 #endif
 419
 420 #define _this_cpu_generic_add_return(pcp, val)                          \
 421 ({                                                                      \
 422         typeof(pcp) ret__;                                              \
 423         preempt_disable();                                              \
 424         __this_cpu_add(pcp, val);                                       \
 425         ret__ = __this_cpu_read(pcp);                                   \
 426         preempt_enable();                                               \
 427         ret__;                                                          \
 428 })
 429
 430 #ifndef this_cpu_add_return
 431 # ifndef this_cpu_add_return_1
 432 #  define this_cpu_add_return_1(pcp, val)       _this_cpu_generic_add_return(pcp, val)
 433 # endif
 434 # ifndef this_cpu_add_return_2
 435 #  define this_cpu_add_return_2(pcp, val)       _this_cpu_generic_add_return(pcp, val)
 436 # endif
 437 # ifndef this_cpu_add_return_4
 438 #  define this_cpu_add_return_4(pcp, val)       _this_cpu_generic_add_return(pcp, val)
 439 # endif
 440 # ifndef this_cpu_add_return_8
 441 #  define this_cpu_add_return_8(pcp, val)       _this_cpu_generic_add_return(pcp, val)
 442 # endif
 443 # define this_cpu_add_return(pcp, val)  __pcpu_size_call_return2(this_cpu_add_return_, pcp, val)
 444 #endif
 445
 446 #define this_cpu_sub_return(pcp, val)   this_cpu_add_return(pcp, -(val))
 447 #define this_cpu_inc_return(pcp)        this_cpu_add_return(pcp, 1)
 448 #define this_cpu_dec_return(pcp)        this_cpu_add_return(pcp, -1)
 449
 450 /*
 451  * Generic percpu operations that do not require preemption handling.
 452  * Either we do not care about races or the caller has the
 453  * responsibility of handling preemptions issues. Arch code can still
 454  * override these instructions since the arch per cpu code may be more
 455  * efficient and may actually get race freeness for free (that is the
 456  * case for x86 for example).
 457  *
 458  * If there is no other protection through preempt disable and/or
 459  * disabling interupts then one of these RMW operations can show unexpected
 460  * behavior because the execution thread was rescheduled on another processor
 461  * or an interrupt occurred and the same percpu variable was modified from
 462  * the interrupt context.
 463  */
 464 #ifndef __this_cpu_read
 465 # ifndef __this_cpu_read_1
 466 #  define __this_cpu_read_1(pcp)        (*__this_cpu_ptr(&(pcp)))
 467 # endif
 468 # ifndef __this_cpu_read_2
 469 #  define __this_cpu_read_2(pcp)        (*__this_cpu_ptr(&(pcp)))
 470 # endif
 471 # ifndef __this_cpu_read_4
 472 #  define __this_cpu_read_4(pcp)        (*__this_cpu_ptr(&(pcp)))
 473 # endif
 474 # ifndef __this_cpu_read_8
 475 #  define __this_cpu_read_8(pcp)        (*__this_cpu_ptr(&(pcp)))
 476 # endif
 477 # define __this_cpu_read(pcp)   __pcpu_size_call_return(__this_cpu_read_, (pcp))
 478 #endif
 479
 480 #define __this_cpu_generic_to_op(pcp, val, op)                          \
 481 do {                                                                    \
 482         *__this_cpu_ptr(&(pcp)) op val;                                 \
 483 } while (0)
 484
 485 #ifndef __this_cpu_write
 486 # ifndef __this_cpu_write_1
 487 #  define __this_cpu_write_1(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 488 # endif
 489 # ifndef __this_cpu_write_2
 490 #  define __this_cpu_write_2(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 491 # endif
 492 # ifndef __this_cpu_write_4
 493 #  define __this_cpu_write_4(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 494 # endif
 495 # ifndef __this_cpu_write_8
 496 #  define __this_cpu_write_8(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 497 # endif
 498 # define __this_cpu_write(pcp, val)     __pcpu_size_call(__this_cpu_write_, (pcp), (val))
 499 #endif
 500
 501 #ifndef __this_cpu_add
 502 # ifndef __this_cpu_add_1
 503 #  define __this_cpu_add_1(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 504 # endif
 505 # ifndef __this_cpu_add_2
 506 #  define __this_cpu_add_2(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 507 # endif
 508 # ifndef __this_cpu_add_4
 509 #  define __this_cpu_add_4(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 510 # endif
 511 # ifndef __this_cpu_add_8
 512 #  define __this_cpu_add_8(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 513 # endif
 514 # define __this_cpu_add(pcp, val)       __pcpu_size_call(__this_cpu_add_, (pcp), (val))
 515 #endif
 516
 517 #ifndef __this_cpu_sub
 518 # define __this_cpu_sub(pcp, val)       __this_cpu_add((pcp), -(val))
 519 #endif
 520
 521 #ifndef __this_cpu_inc
 522 # define __this_cpu_inc(pcp)            __this_cpu_add((pcp), 1)
 523 #endif
 524
 525 #ifndef __this_cpu_dec
 526 # define __this_cpu_dec(pcp)            __this_cpu_sub((pcp), 1)
 527 #endif
 528
 529 #ifndef __this_cpu_and
 530 # ifndef __this_cpu_and_1
 531 #  define __this_cpu_and_1(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 532 # endif
 533 # ifndef __this_cpu_and_2
 534 #  define __this_cpu_and_2(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 535 # endif
 536 # ifndef __this_cpu_and_4
 537 #  define __this_cpu_and_4(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 538 # endif
 539 # ifndef __this_cpu_and_8
 540 #  define __this_cpu_and_8(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 541 # endif
 542 # define __this_cpu_and(pcp, val)       __pcpu_size_call(__this_cpu_and_, (pcp), (val))
 543 #endif
 544
 545 #ifndef __this_cpu_or
 546 # ifndef __this_cpu_or_1
 547 #  define __this_cpu_or_1(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 548 # endif
 549 # ifndef __this_cpu_or_2
 550 #  define __this_cpu_or_2(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 551 # endif
 552 # ifndef __this_cpu_or_4
 553 #  define __this_cpu_or_4(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 554 # endif
 555 # ifndef __this_cpu_or_8
 556 #  define __this_cpu_or_8(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 557 # endif
 558 # define __this_cpu_or(pcp, val)        __pcpu_size_call(__this_cpu_or_, (pcp), (val))
 559 #endif
 560
 561 #ifndef __this_cpu_xor
 562 # ifndef __this_cpu_xor_1
 563 #  define __this_cpu_xor_1(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 564 # endif
 565 # ifndef __this_cpu_xor_2
 566 #  define __this_cpu_xor_2(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 567 # endif
 568 # ifndef __this_cpu_xor_4
 569 #  define __this_cpu_xor_4(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 570 # endif
 571 # ifndef __this_cpu_xor_8
 572 #  define __this_cpu_xor_8(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 573 # endif
 574 # define __this_cpu_xor(pcp, val)       __pcpu_size_call(__this_cpu_xor_, (pcp), (val))
 575 #endif
 576
 577 #define __this_cpu_generic_add_return(pcp, val)                         \
 578 ({                                                                      \
 579         __this_cpu_add(pcp, val);                                       \
 580         __this_cpu_read(pcp);                                           \
 581 })
 582
 583 #ifndef __this_cpu_add_return
 584 # ifndef __this_cpu_add_return_1
 585 #  define __this_cpu_add_return_1(pcp, val)     __this_cpu_generic_add_return(pcp, val)
 586 # endif
 587 # ifndef __this_cpu_add_return_2
 588 #  define __this_cpu_add_return_2(pcp, val)     __this_cpu_generic_add_return(pcp, val)
 589 # endif
 590 # ifndef __this_cpu_add_return_4
 591 #  define __this_cpu_add_return_4(pcp, val)     __this_cpu_generic_add_return(pcp, val)
 592 # endif
 593 # ifndef __this_cpu_add_return_8
 594 #  define __this_cpu_add_return_8(pcp, val)     __this_cpu_generic_add_return(pcp, val)
 595 # endif
 596 # define __this_cpu_add_return(pcp, val)        __pcpu_size_call_return2(this_cpu_add_return_, pcp, val)
 597 #endif
 598
 599 #define __this_cpu_sub_return(pcp, val) this_cpu_add_return(pcp, -(val))
 600 #define __this_cpu_inc_return(pcp)      this_cpu_add_return(pcp, 1)
 601 #define __this_cpu_dec_return(pcp)      this_cpu_add_return(pcp, -1)
 602
 603 /*
 604  * IRQ safe versions of the per cpu RMW operations. Note that these operations
 605  * are *not* safe against modification of the same variable from another
 606  * processors (which one gets when using regular atomic operations)
 607  . They are guaranteed to be atomic vs. local interrupts and
 608  * preemption only.
 609  */
 610 #define irqsafe_cpu_generic_to_op(pcp, val, op)                         \
 611 do {                                                                    \
 612         unsigned long flags;                                            \
 613         local_irq_save(flags);                                          \
 614         *__this_cpu_ptr(&(pcp)) op val;                                 \
 615         local_irq_restore(flags);                                       \
 616 } while (0)
 617
 618 #ifndef irqsafe_cpu_add
 619 # ifndef irqsafe_cpu_add_1
 620 #  define irqsafe_cpu_add_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 621 # endif
 622 # ifndef irqsafe_cpu_add_2
 623 #  define irqsafe_cpu_add_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 624 # endif
 625 # ifndef irqsafe_cpu_add_4
 626 #  define irqsafe_cpu_add_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 627 # endif
 628 # ifndef irqsafe_cpu_add_8
 629 #  define irqsafe_cpu_add_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 630 # endif
 631 # define irqsafe_cpu_add(pcp, val) __pcpu_size_call(irqsafe_cpu_add_, (pcp), (val))
 632 #endif
 633
 634 #ifndef irqsafe_cpu_sub
 635 # define irqsafe_cpu_sub(pcp, val)      irqsafe_cpu_add((pcp), -(val))
 636 #endif
 637
 638 #ifndef irqsafe_cpu_inc
 639 # define irqsafe_cpu_inc(pcp)   irqsafe_cpu_add((pcp), 1)
 640 #endif
 641
 642 #ifndef irqsafe_cpu_dec
 643 # define irqsafe_cpu_dec(pcp)   irqsafe_cpu_sub((pcp), 1)
 644 #endif
 645
 646 #ifndef irqsafe_cpu_and
 647 # ifndef irqsafe_cpu_and_1
 648 #  define irqsafe_cpu_and_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 649 # endif
 650 # ifndef irqsafe_cpu_and_2
 651 #  define irqsafe_cpu_and_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 652 # endif
 653 # ifndef irqsafe_cpu_and_4
 654 #  define irqsafe_cpu_and_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 655 # endif
 656 # ifndef irqsafe_cpu_and_8
 657 #  define irqsafe_cpu_and_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 658 # endif
 659 # define irqsafe_cpu_and(pcp, val) __pcpu_size_call(irqsafe_cpu_and_, (val))
 660 #endif
 661
 662 #ifndef irqsafe_cpu_or
 663 # ifndef irqsafe_cpu_or_1
 664 #  define irqsafe_cpu_or_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 665 # endif
 666 # ifndef irqsafe_cpu_or_2
 667 #  define irqsafe_cpu_or_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 668 # endif
 669 # ifndef irqsafe_cpu_or_4
 670 #  define irqsafe_cpu_or_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 671 # endif
 672 # ifndef irqsafe_cpu_or_8
 673 #  define irqsafe_cpu_or_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 674 # endif
 675 # define irqsafe_cpu_or(pcp, val) __pcpu_size_call(irqsafe_cpu_or_, (val))
 676 #endif
 677
 678 #ifndef irqsafe_cpu_xor
 679 # ifndef irqsafe_cpu_xor_1
 680 #  define irqsafe_cpu_xor_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 681 # endif
 682 # ifndef irqsafe_cpu_xor_2
 683 #  define irqsafe_cpu_xor_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 684 # endif
 685 # ifndef irqsafe_cpu_xor_4
 686 #  define irqsafe_cpu_xor_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 687 # endif
 688 # ifndef irqsafe_cpu_xor_8
 689 #  define irqsafe_cpu_xor_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 690 # endif
 691 # define irqsafe_cpu_xor(pcp, val) __pcpu_size_call(irqsafe_cpu_xor_, (val))
 692 #endif
 693
 694 #endif /* __LINUX_PERCPU_H */