include/linux/percpu.h

   1 #ifndef __LINUX_PERCPU_H
   2 #define __LINUX_PERCPU_H
   3
   4 #include <linux/mmdebug.h>
   5 #include <linux/preempt.h>
   6 #include <linux/smp.h>
   7 #include <linux/cpumask.h>
   8 #include <linux/pfn.h>
   9 #include <linux/init.h>
  10
  11 #include <asm/percpu.h>
  12
  13 /* enough to cover all DEFINE_PER_CPUs in modules */
  14 #ifdef CONFIG_MODULES
  15 #define PERCPU_MODULE_RESERVE           (8 << 10)
  16 #else
  17 #define PERCPU_MODULE_RESERVE           0
  18 #endif
  19
  20 #ifndef PERCPU_ENOUGH_ROOM
  21 #define PERCPU_ENOUGH_ROOM                                              \
  22         (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) +      \
  23          PERCPU_MODULE_RESERVE)
  24 #endif
  25
  26 /* minimum unit size, also is the maximum supported allocation size */
  27 #define PCPU_MIN_UNIT_SIZE              PFN_ALIGN(32 << 10)
  28
  29 /*
  30  * Percpu allocator can serve percpu allocations before slab is
  31  * initialized which allows slab to depend on the percpu allocator.
  32  * The following two parameters decide how much resource to
  33  * preallocate for this.  Keep PERCPU_DYNAMIC_RESERVE equal to or
  34  * larger than PERCPU_DYNAMIC_EARLY_SIZE.
  35  */
  36 #define PERCPU_DYNAMIC_EARLY_SLOTS      128
  37 #define PERCPU_DYNAMIC_EARLY_SIZE       (12 << 10)
  38
  39 /*
  40  * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy
  41  * back on the first chunk for dynamic percpu allocation if arch is
  42  * manually allocating and mapping it for faster access (as a part of
  43  * large page mapping for example).
  44  *
  45  * The following values give between one and two pages of free space
  46  * after typical minimal boot (2-way SMP, single disk and NIC) with
  47  * both defconfig and a distro config on x86_64 and 32.  More
  48  * intelligent way to determine this would be nice.
  49  */
  50 #if BITS_PER_LONG > 32
  51 #define PERCPU_DYNAMIC_RESERVE          (20 << 10)
  52 #else
  53 #define PERCPU_DYNAMIC_RESERVE          (12 << 10)
  54 #endif
  55
  56 extern void *pcpu_base_addr;
  57 extern const unsigned long *pcpu_unit_offsets;
  58
  59 struct pcpu_group_info {
  60         int                     nr_units;       /* aligned # of units */
  61         unsigned long           base_offset;    /* base address offset */
  62         unsigned int            *cpu_map;       /* unit->cpu map, empty
  63                                                  * entries contain NR_CPUS */
  64 };
  65
  66 struct pcpu_alloc_info {
  67         size_t                  static_size;
  68         size_t                  reserved_size;
  69         size_t                  dyn_size;
  70         size_t                  unit_size;
  71         size_t                  atom_size;
  72         size_t                  alloc_size;
  73         size_t                  __ai_size;      /* internal, don't use */
  74         int                     nr_groups;      /* 0 if grouping unnecessary */
  75         struct pcpu_group_info  groups[];
  76 };
  77
  78 enum pcpu_fc {
  79         PCPU_FC_AUTO,
  80         PCPU_FC_EMBED,
  81         PCPU_FC_PAGE,
  82
  83         PCPU_FC_NR,
  84 };
  85 extern const char * const pcpu_fc_names[PCPU_FC_NR];
  86
  87 extern enum pcpu_fc pcpu_chosen_fc;
  88
  89 typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size,
  90                                      size_t align);
  91 typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size);
  92 typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr);
  93 typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to);
  94
  95 extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups,
  96                                                              int nr_units);
  97 extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai);
  98
  99 extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
 100                                          void *base_addr);
 101
 102 #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK
 103 extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
 104                                 size_t atom_size,
 105                                 pcpu_fc_cpu_distance_fn_t cpu_distance_fn,
 106                                 pcpu_fc_alloc_fn_t alloc_fn,
 107                                 pcpu_fc_free_fn_t free_fn);
 108 #endif
 109
 110 #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
 111 extern int __init pcpu_page_first_chunk(size_t reserved_size,
 112                                 pcpu_fc_alloc_fn_t alloc_fn,
 113                                 pcpu_fc_free_fn_t free_fn,
 114                                 pcpu_fc_populate_pte_fn_t populate_pte_fn);
 115 #endif
 116
 117 extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align);
 118 extern bool is_kernel_percpu_address(unsigned long addr);
 119
 120 #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA)
 121 extern void __init setup_per_cpu_areas(void);
 122 #endif
 123 extern void __init percpu_init_late(void);
 124
 125 extern void __percpu *__alloc_percpu(size_t size, size_t align);
 126 extern void free_percpu(void __percpu *__pdata);
 127 extern phys_addr_t per_cpu_ptr_to_phys(void *addr);
 128
 129 #define alloc_percpu(type)      \
 130         (typeof(type) __percpu *)__alloc_percpu(sizeof(type), __alignof__(type))
 131
 132 /*
 133  * Branching function to split up a function into a set of functions that
 134  * are called for different scalar sizes of the objects handled.
 135  */
 136
 137 extern void __bad_size_call_parameter(void);
 138
 139 #ifdef CONFIG_DEBUG_PREEMPT
 140 extern void __this_cpu_preempt_check(const char *op);
 141 #else
 142 static inline void __this_cpu_preempt_check(const char *op) { }
 143 #endif
 144
 145 #define __pcpu_size_call_return(stem, variable)                         \
 146 ({      typeof(variable) pscr_ret__;                                    \
 147         __verify_pcpu_ptr(&(variable));                                 \
 148         switch(sizeof(variable)) {                                      \
 149         case 1: pscr_ret__ = stem##1(variable);break;                   \
 150         case 2: pscr_ret__ = stem##2(variable);break;                   \
 151         case 4: pscr_ret__ = stem##4(variable);break;                   \
 152         case 8: pscr_ret__ = stem##8(variable);break;                   \
 153         default:                                                        \
 154                 __bad_size_call_parameter();break;                      \
 155         }                                                               \
 156         pscr_ret__;                                                     \
 157 })
 158
 159 #define __pcpu_size_call_return2(stem, variable, ...)                   \
 160 ({                                                                      \
 161         typeof(variable) pscr2_ret__;                                   \
 162         __verify_pcpu_ptr(&(variable));                                 \
 163         switch(sizeof(variable)) {                                      \
 164         case 1: pscr2_ret__ = stem##1(variable, __VA_ARGS__); break;    \
 165         case 2: pscr2_ret__ = stem##2(variable, __VA_ARGS__); break;    \
 166         case 4: pscr2_ret__ = stem##4(variable, __VA_ARGS__); break;    \
 167         case 8: pscr2_ret__ = stem##8(variable, __VA_ARGS__); break;    \
 168         default:                                                        \
 169                 __bad_size_call_parameter(); break;                     \
 170         }                                                               \
 171         pscr2_ret__;                                                    \
 172 })
 173
 174 /*
 175  * Special handling for cmpxchg_double.  cmpxchg_double is passed two
 176  * percpu variables.  The first has to be aligned to a double word
 177  * boundary and the second has to follow directly thereafter.
 178  * We enforce this on all architectures even if they don't support
 179  * a double cmpxchg instruction, since it's a cheap requirement, and it
 180  * avoids breaking the requirement for architectures with the instruction.
 181  */
 182 #define __pcpu_double_call_return_bool(stem, pcp1, pcp2, ...)           \
 183 ({                                                                      \
 184         bool pdcrb_ret__;                                               \
 185         __verify_pcpu_ptr(&pcp1);                                       \
 186         BUILD_BUG_ON(sizeof(pcp1) != sizeof(pcp2));                     \
 187         VM_BUG_ON((unsigned long)(&pcp1) % (2 * sizeof(pcp1)));         \
 188         VM_BUG_ON((unsigned long)(&pcp2) !=                             \
 189                   (unsigned long)(&pcp1) + sizeof(pcp1));               \
 190         switch(sizeof(pcp1)) {                                          \
 191         case 1: pdcrb_ret__ = stem##1(pcp1, pcp2, __VA_ARGS__); break;  \
 192         case 2: pdcrb_ret__ = stem##2(pcp1, pcp2, __VA_ARGS__); break;  \
 193         case 4: pdcrb_ret__ = stem##4(pcp1, pcp2, __VA_ARGS__); break;  \
 194         case 8: pdcrb_ret__ = stem##8(pcp1, pcp2, __VA_ARGS__); break;  \
 195         default:                                                        \
 196                 __bad_size_call_parameter(); break;                     \
 197         }                                                               \
 198         pdcrb_ret__;                                                    \
 199 })
 200
 201 #define __pcpu_size_call(stem, variable, ...)                           \
 202 do {                                                                    \
 203         __verify_pcpu_ptr(&(variable));                                 \
 204         switch(sizeof(variable)) {                                      \
 205                 case 1: stem##1(variable, __VA_ARGS__);break;           \
 206                 case 2: stem##2(variable, __VA_ARGS__);break;           \
 207                 case 4: stem##4(variable, __VA_ARGS__);break;           \
 208                 case 8: stem##8(variable, __VA_ARGS__);break;           \
 209                 default:                                                \
 210                         __bad_size_call_parameter();break;              \
 211         }                                                               \
 212 } while (0)
 213
 214 /*
 215  * this_cpu operations (C) 2008-2013 Christoph Lameter <cl@linux.com>
 216  *
 217  * Optimized manipulation for memory allocated through the per cpu
 218  * allocator or for addresses of per cpu variables.
 219  *
 220  * These operation guarantee exclusivity of access for other operations
 221  * on the *same* processor. The assumption is that per cpu data is only
 222  * accessed by a single processor instance (the current one).
 223  *
 224  * The first group is used for accesses that must be done in a
 225  * preemption safe way since we know that the context is not preempt
 226  * safe. Interrupts may occur. If the interrupt modifies the variable
 227  * too then RMW actions will not be reliable.
 228  *
 229  * The arch code can provide optimized functions in two ways:
 230  *
 231  * 1. Override the function completely. F.e. define this_cpu_add().
 232  *    The arch must then ensure that the various scalar format passed
 233  *    are handled correctly.
 234  *
 235  * 2. Provide functions for certain scalar sizes. F.e. provide
 236  *    this_cpu_add_2() to provide per cpu atomic operations for 2 byte
 237  *    sized RMW actions. If arch code does not provide operations for
 238  *    a scalar size then the fallback in the generic code will be
 239  *    used.
 240  */
 241
 242 #define _this_cpu_generic_read(pcp)                                     \
 243 ({      typeof(pcp) ret__;                                              \
 244         preempt_disable();                                              \
 245         ret__ = *this_cpu_ptr(&(pcp));                                  \
 246         preempt_enable();                                               \
 247         ret__;                                                          \
 248 })
 249
 250 #ifndef this_cpu_read
 251 # ifndef this_cpu_read_1
 252 #  define this_cpu_read_1(pcp)  _this_cpu_generic_read(pcp)
 253 # endif
 254 # ifndef this_cpu_read_2
 255 #  define this_cpu_read_2(pcp)  _this_cpu_generic_read(pcp)
 256 # endif
 257 # ifndef this_cpu_read_4
 258 #  define this_cpu_read_4(pcp)  _this_cpu_generic_read(pcp)
 259 # endif
 260 # ifndef this_cpu_read_8
 261 #  define this_cpu_read_8(pcp)  _this_cpu_generic_read(pcp)
 262 # endif
 263 # define this_cpu_read(pcp)     __pcpu_size_call_return(this_cpu_read_, (pcp))
 264 #endif
 265
 266 #define _this_cpu_generic_to_op(pcp, val, op)                           \
 267 do {                                                                    \
 268         unsigned long flags;                                            \
 269         raw_local_irq_save(flags);                                      \
 270         *raw_cpu_ptr(&(pcp)) op val;                                    \
 271         raw_local_irq_restore(flags);                                   \
 272 } while (0)
 273
 274 #ifndef this_cpu_write
 275 # ifndef this_cpu_write_1
 276 #  define this_cpu_write_1(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 277 # endif
 278 # ifndef this_cpu_write_2
 279 #  define this_cpu_write_2(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 280 # endif
 281 # ifndef this_cpu_write_4
 282 #  define this_cpu_write_4(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 283 # endif
 284 # ifndef this_cpu_write_8
 285 #  define this_cpu_write_8(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 286 # endif
 287 # define this_cpu_write(pcp, val)       __pcpu_size_call(this_cpu_write_, (pcp), (val))
 288 #endif
 289
 290 #ifndef this_cpu_add
 291 # ifndef this_cpu_add_1
 292 #  define this_cpu_add_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 293 # endif
 294 # ifndef this_cpu_add_2
 295 #  define this_cpu_add_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 296 # endif
 297 # ifndef this_cpu_add_4
 298 #  define this_cpu_add_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 299 # endif
 300 # ifndef this_cpu_add_8
 301 #  define this_cpu_add_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 302 # endif
 303 # define this_cpu_add(pcp, val)         __pcpu_size_call(this_cpu_add_, (pcp), (val))
 304 #endif
 305
 306 #ifndef this_cpu_sub
 307 # define this_cpu_sub(pcp, val)         this_cpu_add((pcp), -(typeof(pcp))(val))
 308 #endif
 309
 310 #ifndef this_cpu_inc
 311 # define this_cpu_inc(pcp)              this_cpu_add((pcp), 1)
 312 #endif
 313
 314 #ifndef this_cpu_dec
 315 # define this_cpu_dec(pcp)              this_cpu_sub((pcp), 1)
 316 #endif
 317
 318 #ifndef this_cpu_and
 319 # ifndef this_cpu_and_1
 320 #  define this_cpu_and_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 321 # endif
 322 # ifndef this_cpu_and_2
 323 #  define this_cpu_and_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 324 # endif
 325 # ifndef this_cpu_and_4
 326 #  define this_cpu_and_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 327 # endif
 328 # ifndef this_cpu_and_8
 329 #  define this_cpu_and_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 330 # endif
 331 # define this_cpu_and(pcp, val)         __pcpu_size_call(this_cpu_and_, (pcp), (val))
 332 #endif
 333
 334 #ifndef this_cpu_or
 335 # ifndef this_cpu_or_1
 336 #  define this_cpu_or_1(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 337 # endif
 338 # ifndef this_cpu_or_2
 339 #  define this_cpu_or_2(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 340 # endif
 341 # ifndef this_cpu_or_4
 342 #  define this_cpu_or_4(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 343 # endif
 344 # ifndef this_cpu_or_8
 345 #  define this_cpu_or_8(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 346 # endif
 347 # define this_cpu_or(pcp, val)          __pcpu_size_call(this_cpu_or_, (pcp), (val))
 348 #endif
 349
 350 #define _this_cpu_generic_add_return(pcp, val)                          \
 351 ({                                                                      \
 352         typeof(pcp) ret__;                                              \
 353         unsigned long flags;                                            \
 354         raw_local_irq_save(flags);                                      \
 355         raw_cpu_add(pcp, val);                                  \
 356         ret__ = raw_cpu_read(pcp);                                      \
 357         raw_local_irq_restore(flags);                                   \
 358         ret__;                                                          \
 359 })
 360
 361 #ifndef this_cpu_add_return
 362 # ifndef this_cpu_add_return_1
 363 #  define this_cpu_add_return_1(pcp, val)       _this_cpu_generic_add_return(pcp, val)
 364 # endif
 365 # ifndef this_cpu_add_return_2
 366 #  define this_cpu_add_return_2(pcp, val)       _this_cpu_generic_add_return(pcp, val)
 367 # endif
 368 # ifndef this_cpu_add_return_4
 369 #  define this_cpu_add_return_4(pcp, val)       _this_cpu_generic_add_return(pcp, val)
 370 # endif
 371 # ifndef this_cpu_add_return_8
 372 #  define this_cpu_add_return_8(pcp, val)       _this_cpu_generic_add_return(pcp, val)
 373 # endif
 374 # define this_cpu_add_return(pcp, val)  __pcpu_size_call_return2(this_cpu_add_return_, pcp, val)
 375 #endif
 376
 377 #define this_cpu_sub_return(pcp, val)   this_cpu_add_return(pcp, -(typeof(pcp))(val))
 378 #define this_cpu_inc_return(pcp)        this_cpu_add_return(pcp, 1)
 379 #define this_cpu_dec_return(pcp)        this_cpu_add_return(pcp, -1)
 380
 381 #define _this_cpu_generic_xchg(pcp, nval)                               \
 382 ({      typeof(pcp) ret__;                                              \
 383         unsigned long flags;                                            \
 384         raw_local_irq_save(flags);                                      \
 385         ret__ = raw_cpu_read(pcp);                                      \
 386         raw_cpu_write(pcp, nval);                                       \
 387         raw_local_irq_restore(flags);                                   \
 388         ret__;                                                          \
 389 })
 390
 391 #ifndef this_cpu_xchg
 392 # ifndef this_cpu_xchg_1
 393 #  define this_cpu_xchg_1(pcp, nval)    _this_cpu_generic_xchg(pcp, nval)
 394 # endif
 395 # ifndef this_cpu_xchg_2
 396 #  define this_cpu_xchg_2(pcp, nval)    _this_cpu_generic_xchg(pcp, nval)
 397 # endif
 398 # ifndef this_cpu_xchg_4
 399 #  define this_cpu_xchg_4(pcp, nval)    _this_cpu_generic_xchg(pcp, nval)
 400 # endif
 401 # ifndef this_cpu_xchg_8
 402 #  define this_cpu_xchg_8(pcp, nval)    _this_cpu_generic_xchg(pcp, nval)
 403 # endif
 404 # define this_cpu_xchg(pcp, nval)       \
 405         __pcpu_size_call_return2(this_cpu_xchg_, (pcp), nval)
 406 #endif
 407
 408 #define _this_cpu_generic_cmpxchg(pcp, oval, nval)                      \
 409 ({                                                                      \
 410         typeof(pcp) ret__;                                              \
 411         unsigned long flags;                                            \
 412         raw_local_irq_save(flags);                                      \
 413         ret__ = raw_cpu_read(pcp);                                      \
 414         if (ret__ == (oval))                                            \
 415                 raw_cpu_write(pcp, nval);                               \
 416         raw_local_irq_restore(flags);                                   \
 417         ret__;                                                          \
 418 })
 419
 420 #ifndef this_cpu_cmpxchg
 421 # ifndef this_cpu_cmpxchg_1
 422 #  define this_cpu_cmpxchg_1(pcp, oval, nval)   _this_cpu_generic_cmpxchg(pcp, oval, nval)
 423 # endif
 424 # ifndef this_cpu_cmpxchg_2
 425 #  define this_cpu_cmpxchg_2(pcp, oval, nval)   _this_cpu_generic_cmpxchg(pcp, oval, nval)
 426 # endif
 427 # ifndef this_cpu_cmpxchg_4
 428 #  define this_cpu_cmpxchg_4(pcp, oval, nval)   _this_cpu_generic_cmpxchg(pcp, oval, nval)
 429 # endif
 430 # ifndef this_cpu_cmpxchg_8
 431 #  define this_cpu_cmpxchg_8(pcp, oval, nval)   _this_cpu_generic_cmpxchg(pcp, oval, nval)
 432 # endif
 433 # define this_cpu_cmpxchg(pcp, oval, nval)      \
 434         __pcpu_size_call_return2(this_cpu_cmpxchg_, pcp, oval, nval)
 435 #endif
 436
 437 /*
 438  * cmpxchg_double replaces two adjacent scalars at once.  The first
 439  * two parameters are per cpu variables which have to be of the same
 440  * size.  A truth value is returned to indicate success or failure
 441  * (since a double register result is difficult to handle).  There is
 442  * very limited hardware support for these operations, so only certain
 443  * sizes may work.
 444  */
 445 #define _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)        \
 446 ({                                                                      \
 447         int ret__;                                                      \
 448         unsigned long flags;                                            \
 449         raw_local_irq_save(flags);                                      \
 450         ret__ = raw_cpu_generic_cmpxchg_double(pcp1, pcp2,              \
 451                         oval1, oval2, nval1, nval2);                    \
 452         raw_local_irq_restore(flags);                                   \
 453         ret__;                                                          \
 454 })
 455
 456 #ifndef this_cpu_cmpxchg_double
 457 # ifndef this_cpu_cmpxchg_double_1
 458 #  define this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2)     \
 459         _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 460 # endif
 461 # ifndef this_cpu_cmpxchg_double_2
 462 #  define this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2)     \
 463         _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 464 # endif
 465 # ifndef this_cpu_cmpxchg_double_4
 466 #  define this_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2)     \
 467         _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 468 # endif
 469 # ifndef this_cpu_cmpxchg_double_8
 470 #  define this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2)     \
 471         _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 472 # endif
 473 # define this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)        \
 474         __pcpu_double_call_return_bool(this_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2))
 475 #endif
 476
 477 /*
 478  * Generic percpu operations for contexts where we do not want to do
 479  * any checks for preemptiosn.
 480  *
 481  * If there is no other protection through preempt disable and/or
 482  * disabling interupts then one of these RMW operations can show unexpected
 483  * behavior because the execution thread was rescheduled on another processor
 484  * or an interrupt occurred and the same percpu variable was modified from
 485  * the interrupt context.
 486  */
 487 #ifndef raw_cpu_read
 488 # ifndef raw_cpu_read_1
 489 #  define raw_cpu_read_1(pcp)   (*raw_cpu_ptr(&(pcp)))
 490 # endif
 491 # ifndef raw_cpu_read_2
 492 #  define raw_cpu_read_2(pcp)   (*raw_cpu_ptr(&(pcp)))
 493 # endif
 494 # ifndef raw_cpu_read_4
 495 #  define raw_cpu_read_4(pcp)   (*raw_cpu_ptr(&(pcp)))
 496 # endif
 497 # ifndef raw_cpu_read_8
 498 #  define raw_cpu_read_8(pcp)   (*raw_cpu_ptr(&(pcp)))
 499 # endif
 500 # define raw_cpu_read(pcp)      __pcpu_size_call_return(raw_cpu_read_, (pcp))
 501 #endif
 502
 503 #define raw_cpu_generic_to_op(pcp, val, op)                             \
 504 do {                                                                    \
 505         *raw_cpu_ptr(&(pcp)) op val;                                    \
 506 } while (0)
 507
 508
 509 #ifndef raw_cpu_write
 510 # ifndef raw_cpu_write_1
 511 #  define raw_cpu_write_1(pcp, val)     raw_cpu_generic_to_op((pcp), (val), =)
 512 # endif
 513 # ifndef raw_cpu_write_2
 514 #  define raw_cpu_write_2(pcp, val)     raw_cpu_generic_to_op((pcp), (val), =)
 515 # endif
 516 # ifndef raw_cpu_write_4
 517 #  define raw_cpu_write_4(pcp, val)     raw_cpu_generic_to_op((pcp), (val), =)
 518 # endif
 519 # ifndef raw_cpu_write_8
 520 #  define raw_cpu_write_8(pcp, val)     raw_cpu_generic_to_op((pcp), (val), =)
 521 # endif
 522 # define raw_cpu_write(pcp, val)        __pcpu_size_call(raw_cpu_write_, (pcp), (val))
 523 #endif
 524
 525 #ifndef raw_cpu_add
 526 # ifndef raw_cpu_add_1
 527 #  define raw_cpu_add_1(pcp, val)       raw_cpu_generic_to_op((pcp), (val), +=)
 528 # endif
 529 # ifndef raw_cpu_add_2
 530 #  define raw_cpu_add_2(pcp, val)       raw_cpu_generic_to_op((pcp), (val), +=)
 531 # endif
 532 # ifndef raw_cpu_add_4
 533 #  define raw_cpu_add_4(pcp, val)       raw_cpu_generic_to_op((pcp), (val), +=)
 534 # endif
 535 # ifndef raw_cpu_add_8
 536 #  define raw_cpu_add_8(pcp, val)       raw_cpu_generic_to_op((pcp), (val), +=)
 537 # endif
 538 # define raw_cpu_add(pcp, val)  __pcpu_size_call(raw_cpu_add_, (pcp), (val))
 539 #endif
 540
 541 #ifndef raw_cpu_sub
 542 # define raw_cpu_sub(pcp, val)  raw_cpu_add((pcp), -(val))
 543 #endif
 544
 545 #ifndef raw_cpu_inc
 546 # define raw_cpu_inc(pcp)               raw_cpu_add((pcp), 1)
 547 #endif
 548
 549 #ifndef raw_cpu_dec
 550 # define raw_cpu_dec(pcp)               raw_cpu_sub((pcp), 1)
 551 #endif
 552
 553 #ifndef raw_cpu_and
 554 # ifndef raw_cpu_and_1
 555 #  define raw_cpu_and_1(pcp, val)       raw_cpu_generic_to_op((pcp), (val), &=)
 556 # endif
 557 # ifndef raw_cpu_and_2
 558 #  define raw_cpu_and_2(pcp, val)       raw_cpu_generic_to_op((pcp), (val), &=)
 559 # endif
 560 # ifndef raw_cpu_and_4
 561 #  define raw_cpu_and_4(pcp, val)       raw_cpu_generic_to_op((pcp), (val), &=)
 562 # endif
 563 # ifndef raw_cpu_and_8
 564 #  define raw_cpu_and_8(pcp, val)       raw_cpu_generic_to_op((pcp), (val), &=)
 565 # endif
 566 # define raw_cpu_and(pcp, val)  __pcpu_size_call(raw_cpu_and_, (pcp), (val))
 567 #endif
 568
 569 #ifndef raw_cpu_or
 570 # ifndef raw_cpu_or_1
 571 #  define raw_cpu_or_1(pcp, val)        raw_cpu_generic_to_op((pcp), (val), |=)
 572 # endif
 573 # ifndef raw_cpu_or_2
 574 #  define raw_cpu_or_2(pcp, val)        raw_cpu_generic_to_op((pcp), (val), |=)
 575 # endif
 576 # ifndef raw_cpu_or_4
 577 #  define raw_cpu_or_4(pcp, val)        raw_cpu_generic_to_op((pcp), (val), |=)
 578 # endif
 579 # ifndef raw_cpu_or_8
 580 #  define raw_cpu_or_8(pcp, val)        raw_cpu_generic_to_op((pcp), (val), |=)
 581 # endif
 582 # define raw_cpu_or(pcp, val)   __pcpu_size_call(raw_cpu_or_, (pcp), (val))
 583 #endif
 584
 585 #define raw_cpu_generic_add_return(pcp, val)                            \
 586 ({                                                                      \
 587         raw_cpu_add(pcp, val);                                          \
 588         raw_cpu_read(pcp);                                              \
 589 })
 590
 591 #ifndef raw_cpu_add_return
 592 # ifndef raw_cpu_add_return_1
 593 #  define raw_cpu_add_return_1(pcp, val)        raw_cpu_generic_add_return(pcp, val)
 594 # endif
 595 # ifndef raw_cpu_add_return_2
 596 #  define raw_cpu_add_return_2(pcp, val)        raw_cpu_generic_add_return(pcp, val)
 597 # endif
 598 # ifndef raw_cpu_add_return_4
 599 #  define raw_cpu_add_return_4(pcp, val)        raw_cpu_generic_add_return(pcp, val)
 600 # endif
 601 # ifndef raw_cpu_add_return_8
 602 #  define raw_cpu_add_return_8(pcp, val)        raw_cpu_generic_add_return(pcp, val)
 603 # endif
 604 # define raw_cpu_add_return(pcp, val)   \
 605         __pcpu_size_call_return2(raw_cpu_add_return_, pcp, val)
 606 #endif
 607
 608 #define raw_cpu_sub_return(pcp, val)    raw_cpu_add_return(pcp, -(typeof(pcp))(val))
 609 #define raw_cpu_inc_return(pcp) raw_cpu_add_return(pcp, 1)
 610 #define raw_cpu_dec_return(pcp) raw_cpu_add_return(pcp, -1)
 611
 612 #define raw_cpu_generic_xchg(pcp, nval)                                 \
 613 ({      typeof(pcp) ret__;                                              \
 614         ret__ = raw_cpu_read(pcp);                                      \
 615         raw_cpu_write(pcp, nval);                                       \
 616         ret__;                                                          \
 617 })
 618
 619 #ifndef raw_cpu_xchg
 620 # ifndef raw_cpu_xchg_1
 621 #  define raw_cpu_xchg_1(pcp, nval)     raw_cpu_generic_xchg(pcp, nval)
 622 # endif
 623 # ifndef raw_cpu_xchg_2
 624 #  define raw_cpu_xchg_2(pcp, nval)     raw_cpu_generic_xchg(pcp, nval)
 625 # endif
 626 # ifndef raw_cpu_xchg_4
 627 #  define raw_cpu_xchg_4(pcp, nval)     raw_cpu_generic_xchg(pcp, nval)
 628 # endif
 629 # ifndef raw_cpu_xchg_8
 630 #  define raw_cpu_xchg_8(pcp, nval)     raw_cpu_generic_xchg(pcp, nval)
 631 # endif
 632 # define raw_cpu_xchg(pcp, nval)        \
 633         __pcpu_size_call_return2(raw_cpu_xchg_, (pcp), nval)
 634 #endif
 635
 636 #define raw_cpu_generic_cmpxchg(pcp, oval, nval)                        \
 637 ({                                                                      \
 638         typeof(pcp) ret__;                                              \
 639         ret__ = raw_cpu_read(pcp);                                      \
 640         if (ret__ == (oval))                                            \
 641                 raw_cpu_write(pcp, nval);                               \
 642         ret__;                                                          \
 643 })
 644
 645 #ifndef raw_cpu_cmpxchg
 646 # ifndef raw_cpu_cmpxchg_1
 647 #  define raw_cpu_cmpxchg_1(pcp, oval, nval)    raw_cpu_generic_cmpxchg(pcp, oval, nval)
 648 # endif
 649 # ifndef raw_cpu_cmpxchg_2
 650 #  define raw_cpu_cmpxchg_2(pcp, oval, nval)    raw_cpu_generic_cmpxchg(pcp, oval, nval)
 651 # endif
 652 # ifndef raw_cpu_cmpxchg_4
 653 #  define raw_cpu_cmpxchg_4(pcp, oval, nval)    raw_cpu_generic_cmpxchg(pcp, oval, nval)
 654 # endif
 655 # ifndef raw_cpu_cmpxchg_8
 656 #  define raw_cpu_cmpxchg_8(pcp, oval, nval)    raw_cpu_generic_cmpxchg(pcp, oval, nval)
 657 # endif
 658 # define raw_cpu_cmpxchg(pcp, oval, nval)       \
 659         __pcpu_size_call_return2(raw_cpu_cmpxchg_, pcp, oval, nval)
 660 #endif
 661
 662 #define raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)  \
 663 ({                                                                      \
 664         int __ret = 0;                                                  \
 665         if (raw_cpu_read(pcp1) == (oval1) &&                            \
 666                          raw_cpu_read(pcp2)  == (oval2)) {              \
 667                 raw_cpu_write(pcp1, (nval1));                           \
 668                 raw_cpu_write(pcp2, (nval2));                           \
 669                 __ret = 1;                                              \
 670         }                                                               \
 671         (__ret);                                                        \
 672 })
 673
 674 #ifndef raw_cpu_cmpxchg_double
 675 # ifndef raw_cpu_cmpxchg_double_1
 676 #  define raw_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2)      \
 677         raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 678 # endif
 679 # ifndef raw_cpu_cmpxchg_double_2
 680 #  define raw_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2)      \
 681         raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 682 # endif
 683 # ifndef raw_cpu_cmpxchg_double_4
 684 #  define raw_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2)      \
 685         raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 686 # endif
 687 # ifndef raw_cpu_cmpxchg_double_8
 688 #  define raw_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2)      \
 689         raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 690 # endif
 691 # define raw_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
 692         __pcpu_double_call_return_bool(raw_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2))
 693 #endif
 694
 695 /*
 696  * Generic percpu operations for context that are safe from preemption/interrupts.
 697  */
 698 #ifndef __this_cpu_read
 699 # define __this_cpu_read(pcp) \
 700         (__this_cpu_preempt_check("read"),__pcpu_size_call_return(raw_cpu_read_, (pcp)))
 701 #endif
 702
 703 #ifndef __this_cpu_write
 704 # define __this_cpu_write(pcp, val)                                     \
 705 do { __this_cpu_preempt_check("write");                                 \
 706      __pcpu_size_call(raw_cpu_write_, (pcp), (val));                    \
 707 } while (0)
 708 #endif
 709
 710 #ifndef __this_cpu_add
 711 # define __this_cpu_add(pcp, val)                                        \
 712 do { __this_cpu_preempt_check("add");                                   \
 713         __pcpu_size_call(raw_cpu_add_, (pcp), (val));                   \
 714 } while (0)
 715 #endif
 716
 717 #ifndef __this_cpu_sub
 718 # define __this_cpu_sub(pcp, val)       __this_cpu_add((pcp), -(typeof(pcp))(val))
 719 #endif
 720
 721 #ifndef __this_cpu_inc
 722 # define __this_cpu_inc(pcp)            __this_cpu_add((pcp), 1)
 723 #endif
 724
 725 #ifndef __this_cpu_dec
 726 # define __this_cpu_dec(pcp)            __this_cpu_sub((pcp), 1)
 727 #endif
 728
 729 #ifndef __this_cpu_and
 730 # define __this_cpu_and(pcp, val)                                       \
 731 do { __this_cpu_preempt_check("and");                                   \
 732         __pcpu_size_call(raw_cpu_and_, (pcp), (val));                   \
 733 } while (0)
 734
 735 #endif
 736
 737 #ifndef __this_cpu_or
 738 # define __this_cpu_or(pcp, val)                                        \
 739 do { __this_cpu_preempt_check("or");                                    \
 740         __pcpu_size_call(raw_cpu_or_, (pcp), (val));                    \
 741 } while (0)
 742 #endif
 743
 744 #ifndef __this_cpu_add_return
 745 # define __this_cpu_add_return(pcp, val)        \
 746         (__this_cpu_preempt_check("add_return"),__pcpu_size_call_return2(raw_cpu_add_return_, pcp, val))
 747 #endif
 748
 749 #define __this_cpu_sub_return(pcp, val) __this_cpu_add_return(pcp, -(typeof(pcp))(val))
 750 #define __this_cpu_inc_return(pcp)      __this_cpu_add_return(pcp, 1)
 751 #define __this_cpu_dec_return(pcp)      __this_cpu_add_return(pcp, -1)
 752
 753 #ifndef __this_cpu_xchg
 754 # define __this_cpu_xchg(pcp, nval)     \
 755         (__this_cpu_preempt_check("xchg"),__pcpu_size_call_return2(raw_cpu_xchg_, (pcp), nval))
 756 #endif
 757
 758 #ifndef __this_cpu_cmpxchg
 759 # define __this_cpu_cmpxchg(pcp, oval, nval)    \
 760         (__this_cpu_preempt_check("cmpxchg"),__pcpu_size_call_return2(raw_cpu_cmpxchg_, pcp, oval, nval))
 761 #endif
 762
 763 #ifndef __this_cpu_cmpxchg_double
 764 # define __this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)      \
 765         (__this_cpu_preempt_check("cmpxchg_double"),__pcpu_double_call_return_bool(raw_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2)))
 766 #endif
 767
 768 #endif /* __LINUX_PERCPU_H */