include/linux/percpu.h

   1 #ifndef __LINUX_PERCPU_H
   2 #define __LINUX_PERCPU_H
   3
   4 #include <linux/preempt.h>
   5 #include <linux/slab.h> /* For kmalloc() */
   6 #include <linux/smp.h>
   7 #include <linux/cpumask.h>
   8 #include <linux/pfn.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         extern int simple_identifier_##var(void);       \
  31         preempt_disable();                              \
  32         &__get_cpu_var(var); }))
  33 #define put_cpu_var(var) preempt_enable()
  34
  35 #ifdef CONFIG_SMP
  36
  37 /* minimum unit size, also is the maximum supported allocation size */
  38 #define PCPU_MIN_UNIT_SIZE              PFN_ALIGN(64 << 10)
  39
  40 /*
  41  * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy
  42  * back on the first chunk for dynamic percpu allocation if arch is
  43  * manually allocating and mapping it for faster access (as a part of
  44  * large page mapping for example).
  45  *
  46  * The following values give between one and two pages of free space
  47  * after typical minimal boot (2-way SMP, single disk and NIC) with
  48  * both defconfig and a distro config on x86_64 and 32.  More
  49  * intelligent way to determine this would be nice.
  50  */
  51 #if BITS_PER_LONG > 32
  52 #define PERCPU_DYNAMIC_RESERVE          (20 << 10)
  53 #else
  54 #define PERCPU_DYNAMIC_RESERVE          (12 << 10)
  55 #endif
  56
  57 extern void *pcpu_base_addr;
  58 extern const unsigned long *pcpu_unit_offsets;
  59
  60 struct pcpu_group_info {
  61         int                     nr_units;       /* aligned # of units */
  62         unsigned long           base_offset;    /* base address offset */
  63         unsigned int            *cpu_map;       /* unit->cpu map, empty
  64                                                  * entries contain NR_CPUS */
  65 };
  66
  67 struct pcpu_alloc_info {
  68         size_t                  static_size;
  69         size_t                  reserved_size;
  70         size_t                  dyn_size;
  71         size_t                  unit_size;
  72         size_t                  atom_size;
  73         size_t                  alloc_size;
  74         size_t                  __ai_size;      /* internal, don't use */
  75         int                     nr_groups;      /* 0 if grouping unnecessary */
  76         struct pcpu_group_info  groups[];
  77 };
  78
  79 enum pcpu_fc {
  80         PCPU_FC_AUTO,
  81         PCPU_FC_EMBED,
  82         PCPU_FC_PAGE,
  83
  84         PCPU_FC_NR,
  85 };
  86 extern const char *pcpu_fc_names[PCPU_FC_NR];
  87
  88 extern enum pcpu_fc pcpu_chosen_fc;
  89
  90 typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size,
  91                                      size_t align);
  92 typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size);
  93 typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr);
  94 typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to);
  95
  96 extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups,
  97                                                              int nr_units);
  98 extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai);
  99
 100 extern struct pcpu_alloc_info * __init pcpu_build_alloc_info(
 101                                 size_t reserved_size, ssize_t dyn_size,
 102                                 size_t atom_size,
 103                                 pcpu_fc_cpu_distance_fn_t cpu_distance_fn);
 104
 105 extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
 106                                          void *base_addr);
 107
 108 #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK
 109 extern int __init pcpu_embed_first_chunk(size_t reserved_size, ssize_t dyn_size,
 110                                 size_t atom_size,
 111                                 pcpu_fc_cpu_distance_fn_t cpu_distance_fn,
 112                                 pcpu_fc_alloc_fn_t alloc_fn,
 113                                 pcpu_fc_free_fn_t free_fn);
 114 #endif
 115
 116 #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
 117 extern int __init pcpu_page_first_chunk(size_t reserved_size,
 118                                 pcpu_fc_alloc_fn_t alloc_fn,
 119                                 pcpu_fc_free_fn_t free_fn,
 120                                 pcpu_fc_populate_pte_fn_t populate_pte_fn);
 121 #endif
 122
 123 /*
 124  * Use this to get to a cpu's version of the per-cpu object
 125  * dynamically allocated. Non-atomic access to the current CPU's
 126  * version should probably be combined with get_cpu()/put_cpu().
 127  */
 128 #define per_cpu_ptr(ptr, cpu)   SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu)))
 129
 130 extern void *__alloc_reserved_percpu(size_t size, size_t align);
 131 extern void *__alloc_percpu(size_t size, size_t align);
 132 extern void free_percpu(void *__pdata);
 133 extern phys_addr_t per_cpu_ptr_to_phys(void *addr);
 134
 135 #ifndef CONFIG_HAVE_SETUP_PER_CPU_AREA
 136 extern void __init setup_per_cpu_areas(void);
 137 #endif
 138
 139 #else /* CONFIG_SMP */
 140
 141 #define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); (ptr); })
 142
 143 static inline void *__alloc_percpu(size_t size, size_t align)
 144 {
 145         /*
 146          * Can't easily make larger alignment work with kmalloc.  WARN
 147          * on it.  Larger alignment should only be used for module
 148          * percpu sections on SMP for which this path isn't used.
 149          */
 150         WARN_ON_ONCE(align > SMP_CACHE_BYTES);
 151         return kzalloc(size, GFP_KERNEL);
 152 }
 153
 154 static inline void free_percpu(void *p)
 155 {
 156         kfree(p);
 157 }
 158
 159 static inline phys_addr_t per_cpu_ptr_to_phys(void *addr)
 160 {
 161         return __pa(addr);
 162 }
 163
 164 static inline void __init setup_per_cpu_areas(void) { }
 165
 166 static inline void *pcpu_lpage_remapped(void *kaddr)
 167 {
 168         return NULL;
 169 }
 170
 171 #endif /* CONFIG_SMP */
 172
 173 #define alloc_percpu(type)      \
 174         (typeof(type) *)__alloc_percpu(sizeof(type), __alignof__(type))
 175
 176 /*
 177  * Optional methods for optimized non-lvalue per-cpu variable access.
 178  *
 179  * @var can be a percpu variable or a field of it and its size should
 180  * equal char, int or long.  percpu_read() evaluates to a lvalue and
 181  * all others to void.
 182  *
 183  * These operations are guaranteed to be atomic w.r.t. preemption.
 184  * The generic versions use plain get/put_cpu_var().  Archs are
 185  * encouraged to implement single-instruction alternatives which don't
 186  * require preemption protection.
 187  */
 188 #ifndef percpu_read
 189 # define percpu_read(var)                                               \
 190   ({                                                                    \
 191         typeof(per_cpu_var(var)) __tmp_var__;                           \
 192         __tmp_var__ = get_cpu_var(var);                                 \
 193         put_cpu_var(var);                                               \
 194         __tmp_var__;                                                    \
 195   })
 196 #endif
 197
 198 #define __percpu_generic_to_op(var, val, op)                            \
 199 do {                                                                    \
 200         get_cpu_var(var) op val;                                        \
 201         put_cpu_var(var);                                               \
 202 } while (0)
 203
 204 #ifndef percpu_write
 205 # define percpu_write(var, val)         __percpu_generic_to_op(var, (val), =)
 206 #endif
 207
 208 #ifndef percpu_add
 209 # define percpu_add(var, val)           __percpu_generic_to_op(var, (val), +=)
 210 #endif
 211
 212 #ifndef percpu_sub
 213 # define percpu_sub(var, val)           __percpu_generic_to_op(var, (val), -=)
 214 #endif
 215
 216 #ifndef percpu_and
 217 # define percpu_and(var, val)           __percpu_generic_to_op(var, (val), &=)
 218 #endif
 219
 220 #ifndef percpu_or
 221 # define percpu_or(var, val)            __percpu_generic_to_op(var, (val), |=)
 222 #endif
 223
 224 #ifndef percpu_xor
 225 # define percpu_xor(var, val)           __percpu_generic_to_op(var, (val), ^=)
 226 #endif
 227
 228 /*
 229  * Branching function to split up a function into a set of functions that
 230  * are called for different scalar sizes of the objects handled.
 231  */
 232
 233 extern void __bad_size_call_parameter(void);
 234
 235 #define __pcpu_size_call_return(stem, variable)                         \
 236 ({      typeof(variable) pscr_ret__;                                    \
 237         switch(sizeof(variable)) {                                      \
 238         case 1: pscr_ret__ = stem##1(variable);break;                   \
 239         case 2: pscr_ret__ = stem##2(variable);break;                   \
 240         case 4: pscr_ret__ = stem##4(variable);break;                   \
 241         case 8: pscr_ret__ = stem##8(variable);break;                   \
 242         default:                                                        \
 243                 __bad_size_call_parameter();break;                      \
 244         }                                                               \
 245         pscr_ret__;                                                     \
 246 })
 247
 248 #define __pcpu_size_call(stem, variable, ...)                           \
 249 do {                                                                    \
 250         switch(sizeof(variable)) {                                      \
 251                 case 1: stem##1(variable, __VA_ARGS__);break;           \
 252                 case 2: stem##2(variable, __VA_ARGS__);break;           \
 253                 case 4: stem##4(variable, __VA_ARGS__);break;           \
 254                 case 8: stem##8(variable, __VA_ARGS__);break;           \
 255                 default:                                                \
 256                         __bad_size_call_parameter();break;              \
 257         }                                                               \
 258 } while (0)
 259
 260 /*
 261  * Optimized manipulation for memory allocated through the per cpu
 262  * allocator or for addresses of per cpu variables (can be determined
 263  * using per_cpu_var(xx).
 264  *
 265  * These operation guarantee exclusivity of access for other operations
 266  * on the *same* processor. The assumption is that per cpu data is only
 267  * accessed by a single processor instance (the current one).
 268  *
 269  * The first group is used for accesses that must be done in a
 270  * preemption safe way since we know that the context is not preempt
 271  * safe. Interrupts may occur. If the interrupt modifies the variable
 272  * too then RMW actions will not be reliable.
 273  *
 274  * The arch code can provide optimized functions in two ways:
 275  *
 276  * 1. Override the function completely. F.e. define this_cpu_add().
 277  *    The arch must then ensure that the various scalar format passed
 278  *    are handled correctly.
 279  *
 280  * 2. Provide functions for certain scalar sizes. F.e. provide
 281  *    this_cpu_add_2() to provide per cpu atomic operations for 2 byte
 282  *    sized RMW actions. If arch code does not provide operations for
 283  *    a scalar size then the fallback in the generic code will be
 284  *    used.
 285  */
 286
 287 #define _this_cpu_generic_read(pcp)                                     \
 288 ({      typeof(pcp) ret__;                                              \
 289         preempt_disable();                                              \
 290         ret__ = *this_cpu_ptr(&(pcp));                                  \
 291         preempt_enable();                                               \
 292         ret__;                                                          \
 293 })
 294
 295 #ifndef this_cpu_read
 296 # ifndef this_cpu_read_1
 297 #  define this_cpu_read_1(pcp)  _this_cpu_generic_read(pcp)
 298 # endif
 299 # ifndef this_cpu_read_2
 300 #  define this_cpu_read_2(pcp)  _this_cpu_generic_read(pcp)
 301 # endif
 302 # ifndef this_cpu_read_4
 303 #  define this_cpu_read_4(pcp)  _this_cpu_generic_read(pcp)
 304 # endif
 305 # ifndef this_cpu_read_8
 306 #  define this_cpu_read_8(pcp)  _this_cpu_generic_read(pcp)
 307 # endif
 308 # define this_cpu_read(pcp)     __pcpu_size_call_return(this_cpu_read_, (pcp))
 309 #endif
 310
 311 #define _this_cpu_generic_to_op(pcp, val, op)                           \
 312 do {                                                                    \
 313         preempt_disable();                                              \
 314         *__this_cpu_ptr(&pcp) op val;                                   \
 315         preempt_enable();                                               \
 316 } while (0)
 317
 318 #ifndef this_cpu_write
 319 # ifndef this_cpu_write_1
 320 #  define this_cpu_write_1(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 321 # endif
 322 # ifndef this_cpu_write_2
 323 #  define this_cpu_write_2(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 324 # endif
 325 # ifndef this_cpu_write_4
 326 #  define this_cpu_write_4(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 327 # endif
 328 # ifndef this_cpu_write_8
 329 #  define this_cpu_write_8(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 330 # endif
 331 # define this_cpu_write(pcp, val)       __pcpu_size_call(this_cpu_write_, (pcp), (val))
 332 #endif
 333
 334 #ifndef this_cpu_add
 335 # ifndef this_cpu_add_1
 336 #  define this_cpu_add_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 337 # endif
 338 # ifndef this_cpu_add_2
 339 #  define this_cpu_add_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 340 # endif
 341 # ifndef this_cpu_add_4
 342 #  define this_cpu_add_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 343 # endif
 344 # ifndef this_cpu_add_8
 345 #  define this_cpu_add_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 346 # endif
 347 # define this_cpu_add(pcp, val)         __pcpu_size_call(this_cpu_add_, (pcp), (val))
 348 #endif
 349
 350 #ifndef this_cpu_sub
 351 # define this_cpu_sub(pcp, val)         this_cpu_add((pcp), -(val))
 352 #endif
 353
 354 #ifndef this_cpu_inc
 355 # define this_cpu_inc(pcp)              this_cpu_add((pcp), 1)
 356 #endif
 357
 358 #ifndef this_cpu_dec
 359 # define this_cpu_dec(pcp)              this_cpu_sub((pcp), 1)
 360 #endif
 361
 362 #ifndef this_cpu_and
 363 # ifndef this_cpu_and_1
 364 #  define this_cpu_and_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 365 # endif
 366 # ifndef this_cpu_and_2
 367 #  define this_cpu_and_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 368 # endif
 369 # ifndef this_cpu_and_4
 370 #  define this_cpu_and_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 371 # endif
 372 # ifndef this_cpu_and_8
 373 #  define this_cpu_and_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 374 # endif
 375 # define this_cpu_and(pcp, val)         __pcpu_size_call(this_cpu_and_, (pcp), (val))
 376 #endif
 377
 378 #ifndef this_cpu_or
 379 # ifndef this_cpu_or_1
 380 #  define this_cpu_or_1(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 381 # endif
 382 # ifndef this_cpu_or_2
 383 #  define this_cpu_or_2(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 384 # endif
 385 # ifndef this_cpu_or_4
 386 #  define this_cpu_or_4(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 387 # endif
 388 # ifndef this_cpu_or_8
 389 #  define this_cpu_or_8(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 390 # endif
 391 # define this_cpu_or(pcp, val)          __pcpu_size_call(this_cpu_or_, (pcp), (val))
 392 #endif
 393
 394 #ifndef this_cpu_xor
 395 # ifndef this_cpu_xor_1
 396 #  define this_cpu_xor_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 397 # endif
 398 # ifndef this_cpu_xor_2
 399 #  define this_cpu_xor_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 400 # endif
 401 # ifndef this_cpu_xor_4
 402 #  define this_cpu_xor_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 403 # endif
 404 # ifndef this_cpu_xor_8
 405 #  define this_cpu_xor_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), ^=)
 406 # endif
 407 # define this_cpu_xor(pcp, val)         __pcpu_size_call(this_cpu_or_, (pcp), (val))
 408 #endif
 409
 410 /*
 411  * Generic percpu operations that do not require preemption handling.
 412  * Either we do not care about races or the caller has the
 413  * responsibility of handling preemptions issues. Arch code can still
 414  * override these instructions since the arch per cpu code may be more
 415  * efficient and may actually get race freeness for free (that is the
 416  * case for x86 for example).
 417  *
 418  * If there is no other protection through preempt disable and/or
 419  * disabling interupts then one of these RMW operations can show unexpected
 420  * behavior because the execution thread was rescheduled on another processor
 421  * or an interrupt occurred and the same percpu variable was modified from
 422  * the interrupt context.
 423  */
 424 #ifndef __this_cpu_read
 425 # ifndef __this_cpu_read_1
 426 #  define __this_cpu_read_1(pcp)        (*__this_cpu_ptr(&(pcp)))
 427 # endif
 428 # ifndef __this_cpu_read_2
 429 #  define __this_cpu_read_2(pcp)        (*__this_cpu_ptr(&(pcp)))
 430 # endif
 431 # ifndef __this_cpu_read_4
 432 #  define __this_cpu_read_4(pcp)        (*__this_cpu_ptr(&(pcp)))
 433 # endif
 434 # ifndef __this_cpu_read_8
 435 #  define __this_cpu_read_8(pcp)        (*__this_cpu_ptr(&(pcp)))
 436 # endif
 437 # define __this_cpu_read(pcp)   __pcpu_size_call_return(__this_cpu_read_, (pcp))
 438 #endif
 439
 440 #define __this_cpu_generic_to_op(pcp, val, op)                          \
 441 do {                                                                    \
 442         *__this_cpu_ptr(&(pcp)) op val;                                 \
 443 } while (0)
 444
 445 #ifndef __this_cpu_write
 446 # ifndef __this_cpu_write_1
 447 #  define __this_cpu_write_1(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 448 # endif
 449 # ifndef __this_cpu_write_2
 450 #  define __this_cpu_write_2(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 451 # endif
 452 # ifndef __this_cpu_write_4
 453 #  define __this_cpu_write_4(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 454 # endif
 455 # ifndef __this_cpu_write_8
 456 #  define __this_cpu_write_8(pcp, val)  __this_cpu_generic_to_op((pcp), (val), =)
 457 # endif
 458 # define __this_cpu_write(pcp, val)     __pcpu_size_call(__this_cpu_write_, (pcp), (val))
 459 #endif
 460
 461 #ifndef __this_cpu_add
 462 # ifndef __this_cpu_add_1
 463 #  define __this_cpu_add_1(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 464 # endif
 465 # ifndef __this_cpu_add_2
 466 #  define __this_cpu_add_2(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 467 # endif
 468 # ifndef __this_cpu_add_4
 469 #  define __this_cpu_add_4(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 470 # endif
 471 # ifndef __this_cpu_add_8
 472 #  define __this_cpu_add_8(pcp, val)    __this_cpu_generic_to_op((pcp), (val), +=)
 473 # endif
 474 # define __this_cpu_add(pcp, val)       __pcpu_size_call(__this_cpu_add_, (pcp), (val))
 475 #endif
 476
 477 #ifndef __this_cpu_sub
 478 # define __this_cpu_sub(pcp, val)       __this_cpu_add((pcp), -(val))
 479 #endif
 480
 481 #ifndef __this_cpu_inc
 482 # define __this_cpu_inc(pcp)            __this_cpu_add((pcp), 1)
 483 #endif
 484
 485 #ifndef __this_cpu_dec
 486 # define __this_cpu_dec(pcp)            __this_cpu_sub((pcp), 1)
 487 #endif
 488
 489 #ifndef __this_cpu_and
 490 # ifndef __this_cpu_and_1
 491 #  define __this_cpu_and_1(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 492 # endif
 493 # ifndef __this_cpu_and_2
 494 #  define __this_cpu_and_2(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 495 # endif
 496 # ifndef __this_cpu_and_4
 497 #  define __this_cpu_and_4(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 498 # endif
 499 # ifndef __this_cpu_and_8
 500 #  define __this_cpu_and_8(pcp, val)    __this_cpu_generic_to_op((pcp), (val), &=)
 501 # endif
 502 # define __this_cpu_and(pcp, val)       __pcpu_size_call(__this_cpu_and_, (pcp), (val))
 503 #endif
 504
 505 #ifndef __this_cpu_or
 506 # ifndef __this_cpu_or_1
 507 #  define __this_cpu_or_1(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 508 # endif
 509 # ifndef __this_cpu_or_2
 510 #  define __this_cpu_or_2(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 511 # endif
 512 # ifndef __this_cpu_or_4
 513 #  define __this_cpu_or_4(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 514 # endif
 515 # ifndef __this_cpu_or_8
 516 #  define __this_cpu_or_8(pcp, val)     __this_cpu_generic_to_op((pcp), (val), |=)
 517 # endif
 518 # define __this_cpu_or(pcp, val)        __pcpu_size_call(__this_cpu_or_, (pcp), (val))
 519 #endif
 520
 521 #ifndef __this_cpu_xor
 522 # ifndef __this_cpu_xor_1
 523 #  define __this_cpu_xor_1(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 524 # endif
 525 # ifndef __this_cpu_xor_2
 526 #  define __this_cpu_xor_2(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 527 # endif
 528 # ifndef __this_cpu_xor_4
 529 #  define __this_cpu_xor_4(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 530 # endif
 531 # ifndef __this_cpu_xor_8
 532 #  define __this_cpu_xor_8(pcp, val)    __this_cpu_generic_to_op((pcp), (val), ^=)
 533 # endif
 534 # define __this_cpu_xor(pcp, val)       __pcpu_size_call(__this_cpu_xor_, (pcp), (val))
 535 #endif
 536
 537 /*
 538  * IRQ safe versions of the per cpu RMW operations. Note that these operations
 539  * are *not* safe against modification of the same variable from another
 540  * processors (which one gets when using regular atomic operations)
 541  . They are guaranteed to be atomic vs. local interrupts and
 542  * preemption only.
 543  */
 544 #define irqsafe_cpu_generic_to_op(pcp, val, op)                         \
 545 do {                                                                    \
 546         unsigned long flags;                                            \
 547         local_irq_save(flags);                                          \
 548         *__this_cpu_ptr(&(pcp)) op val;                                 \
 549         local_irq_restore(flags);                                       \
 550 } while (0)
 551
 552 #ifndef irqsafe_cpu_add
 553 # ifndef irqsafe_cpu_add_1
 554 #  define irqsafe_cpu_add_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 555 # endif
 556 # ifndef irqsafe_cpu_add_2
 557 #  define irqsafe_cpu_add_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 558 # endif
 559 # ifndef irqsafe_cpu_add_4
 560 #  define irqsafe_cpu_add_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 561 # endif
 562 # ifndef irqsafe_cpu_add_8
 563 #  define irqsafe_cpu_add_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=)
 564 # endif
 565 # define irqsafe_cpu_add(pcp, val) __pcpu_size_call(irqsafe_cpu_add_, (pcp), (val))
 566 #endif
 567
 568 #ifndef irqsafe_cpu_sub
 569 # define irqsafe_cpu_sub(pcp, val)      irqsafe_cpu_add((pcp), -(val))
 570 #endif
 571
 572 #ifndef irqsafe_cpu_inc
 573 # define irqsafe_cpu_inc(pcp)   irqsafe_cpu_add((pcp), 1)
 574 #endif
 575
 576 #ifndef irqsafe_cpu_dec
 577 # define irqsafe_cpu_dec(pcp)   irqsafe_cpu_sub((pcp), 1)
 578 #endif
 579
 580 #ifndef irqsafe_cpu_and
 581 # ifndef irqsafe_cpu_and_1
 582 #  define irqsafe_cpu_and_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 583 # endif
 584 # ifndef irqsafe_cpu_and_2
 585 #  define irqsafe_cpu_and_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 586 # endif
 587 # ifndef irqsafe_cpu_and_4
 588 #  define irqsafe_cpu_and_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 589 # endif
 590 # ifndef irqsafe_cpu_and_8
 591 #  define irqsafe_cpu_and_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=)
 592 # endif
 593 # define irqsafe_cpu_and(pcp, val) __pcpu_size_call(irqsafe_cpu_and_, (val))
 594 #endif
 595
 596 #ifndef irqsafe_cpu_or
 597 # ifndef irqsafe_cpu_or_1
 598 #  define irqsafe_cpu_or_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 599 # endif
 600 # ifndef irqsafe_cpu_or_2
 601 #  define irqsafe_cpu_or_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 602 # endif
 603 # ifndef irqsafe_cpu_or_4
 604 #  define irqsafe_cpu_or_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 605 # endif
 606 # ifndef irqsafe_cpu_or_8
 607 #  define irqsafe_cpu_or_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=)
 608 # endif
 609 # define irqsafe_cpu_or(pcp, val) __pcpu_size_call(irqsafe_cpu_or_, (val))
 610 #endif
 611
 612 #ifndef irqsafe_cpu_xor
 613 # ifndef irqsafe_cpu_xor_1
 614 #  define irqsafe_cpu_xor_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 615 # endif
 616 # ifndef irqsafe_cpu_xor_2
 617 #  define irqsafe_cpu_xor_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 618 # endif
 619 # ifndef irqsafe_cpu_xor_4
 620 #  define irqsafe_cpu_xor_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 621 # endif
 622 # ifndef irqsafe_cpu_xor_8
 623 #  define irqsafe_cpu_xor_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=)
 624 # endif
 625 # define irqsafe_cpu_xor(pcp, val) __pcpu_size_call(irqsafe_cpu_xor_, (val))
 626 #endif
 627
 628 #endif /* __LINUX_PERCPU_H */