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 /*
  27  * Must be an lvalue. Since @var must be a simple identifier,
  28  * we force a syntax error here if it isn't.
  29  */
  30 #define get_cpu_var(var) (*({                           \
  31         preempt_disable();                              \
  32         this_cpu_ptr(&var); }))
  33
  34 /*
  35  * The weird & is necessary because sparse considers (void)(var) to be
  36  * a direct dereference of percpu variable (var).
  37  */
  38 #define put_cpu_var(var) do {                           \
  39         (void)&(var);                                   \
  40         preempt_enable();                               \
  41 } while (0)
  42
  43 #define get_cpu_ptr(var) ({                             \
  44         preempt_disable();                              \
  45         this_cpu_ptr(var); })
  46
  47 #define put_cpu_ptr(var) do {                           \
  48         (void)(var);                                    \
  49         preempt_enable();                               \
  50 } while (0)
  51
  52 /* minimum unit size, also is the maximum supported allocation size */
  53 #define PCPU_MIN_UNIT_SIZE              PFN_ALIGN(32 << 10)
  54
  55 /*
  56  * Percpu allocator can serve percpu allocations before slab is
  57  * initialized which allows slab to depend on the percpu allocator.
  58  * The following two parameters decide how much resource to
  59  * preallocate for this.  Keep PERCPU_DYNAMIC_RESERVE equal to or
  60  * larger than PERCPU_DYNAMIC_EARLY_SIZE.
  61  */
  62 #define PERCPU_DYNAMIC_EARLY_SLOTS      128
  63 #define PERCPU_DYNAMIC_EARLY_SIZE       (12 << 10)
  64
  65 /*
  66  * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy
  67  * back on the first chunk for dynamic percpu allocation if arch is
  68  * manually allocating and mapping it for faster access (as a part of
  69  * large page mapping for example).
  70  *
  71  * The following values give between one and two pages of free space
  72  * after typical minimal boot (2-way SMP, single disk and NIC) with
  73  * both defconfig and a distro config on x86_64 and 32.  More
  74  * intelligent way to determine this would be nice.
  75  */
  76 #if BITS_PER_LONG > 32
  77 #define PERCPU_DYNAMIC_RESERVE          (20 << 10)
  78 #else
  79 #define PERCPU_DYNAMIC_RESERVE          (12 << 10)
  80 #endif
  81
  82 extern void *pcpu_base_addr;
  83 extern const unsigned long *pcpu_unit_offsets;
  84
  85 struct pcpu_group_info {
  86         int                     nr_units;       /* aligned # of units */
  87         unsigned long           base_offset;    /* base address offset */
  88         unsigned int            *cpu_map;       /* unit->cpu map, empty
  89                                                  * entries contain NR_CPUS */
  90 };
  91
  92 struct pcpu_alloc_info {
  93         size_t                  static_size;
  94         size_t                  reserved_size;
  95         size_t                  dyn_size;
  96         size_t                  unit_size;
  97         size_t                  atom_size;
  98         size_t                  alloc_size;
  99         size_t                  __ai_size;      /* internal, don't use */
 100         int                     nr_groups;      /* 0 if grouping unnecessary */
 101         struct pcpu_group_info  groups[];
 102 };
 103
 104 enum pcpu_fc {
 105         PCPU_FC_AUTO,
 106         PCPU_FC_EMBED,
 107         PCPU_FC_PAGE,
 108
 109         PCPU_FC_NR,
 110 };
 111 extern const char * const pcpu_fc_names[PCPU_FC_NR];
 112
 113 extern enum pcpu_fc pcpu_chosen_fc;
 114
 115 typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size,
 116                                      size_t align);
 117 typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size);
 118 typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr);
 119 typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to);
 120
 121 extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups,
 122                                                              int nr_units);
 123 extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai);
 124
 125 extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
 126                                          void *base_addr);
 127
 128 #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK
 129 extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
 130                                 size_t atom_size,
 131                                 pcpu_fc_cpu_distance_fn_t cpu_distance_fn,
 132                                 pcpu_fc_alloc_fn_t alloc_fn,
 133                                 pcpu_fc_free_fn_t free_fn);
 134 #endif
 135
 136 #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
 137 extern int __init pcpu_page_first_chunk(size_t reserved_size,
 138                                 pcpu_fc_alloc_fn_t alloc_fn,
 139                                 pcpu_fc_free_fn_t free_fn,
 140                                 pcpu_fc_populate_pte_fn_t populate_pte_fn);
 141 #endif
 142
 143 /*
 144  * Use this to get to a cpu's version of the per-cpu object
 145  * dynamically allocated. Non-atomic access to the current CPU's
 146  * version should probably be combined with get_cpu()/put_cpu().
 147  */
 148 #ifdef CONFIG_SMP
 149 #define per_cpu_ptr(ptr, cpu)   SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu)))
 150 #else
 151 #define per_cpu_ptr(ptr, cpu)   ({ (void)(cpu); VERIFY_PERCPU_PTR((ptr)); })
 152 #endif
 153
 154 extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align);
 155 extern bool is_kernel_percpu_address(unsigned long addr);
 156
 157 #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA)
 158 extern void __init setup_per_cpu_areas(void);
 159 #endif
 160 extern void __init percpu_init_late(void);
 161
 162 extern void __percpu *__alloc_percpu(size_t size, size_t align);
 163 extern void free_percpu(void __percpu *__pdata);
 164 extern phys_addr_t per_cpu_ptr_to_phys(void *addr);
 165
 166 #define alloc_percpu(type)      \
 167         (typeof(type) __percpu *)__alloc_percpu(sizeof(type), __alignof__(type))
 168
 169 /*
 170  * Branching function to split up a function into a set of functions that
 171  * are called for different scalar sizes of the objects handled.
 172  */
 173
 174 extern void __bad_size_call_parameter(void);
 175
 176 #ifdef CONFIG_DEBUG_PREEMPT
 177 extern void __this_cpu_preempt_check(const char *op);
 178 #else
 179 static inline void __this_cpu_preempt_check(const char *op) { }
 180 #endif
 181
 182 #define __pcpu_size_call_return(stem, variable)                         \
 183 ({      typeof(variable) pscr_ret__;                                    \
 184         __verify_pcpu_ptr(&(variable));                                 \
 185         switch(sizeof(variable)) {                                      \
 186         case 1: pscr_ret__ = stem##1(variable);break;                   \
 187         case 2: pscr_ret__ = stem##2(variable);break;                   \
 188         case 4: pscr_ret__ = stem##4(variable);break;                   \
 189         case 8: pscr_ret__ = stem##8(variable);break;                   \
 190         default:                                                        \
 191                 __bad_size_call_parameter();break;                      \
 192         }                                                               \
 193         pscr_ret__;                                                     \
 194 })
 195
 196 #define __pcpu_size_call_return2(stem, variable, ...)                   \
 197 ({                                                                      \
 198         typeof(variable) pscr2_ret__;                                   \
 199         __verify_pcpu_ptr(&(variable));                                 \
 200         switch(sizeof(variable)) {                                      \
 201         case 1: pscr2_ret__ = stem##1(variable, __VA_ARGS__); break;    \
 202         case 2: pscr2_ret__ = stem##2(variable, __VA_ARGS__); break;    \
 203         case 4: pscr2_ret__ = stem##4(variable, __VA_ARGS__); break;    \
 204         case 8: pscr2_ret__ = stem##8(variable, __VA_ARGS__); break;    \
 205         default:                                                        \
 206                 __bad_size_call_parameter(); break;                     \
 207         }                                                               \
 208         pscr2_ret__;                                                    \
 209 })
 210
 211 /*
 212  * Special handling for cmpxchg_double.  cmpxchg_double is passed two
 213  * percpu variables.  The first has to be aligned to a double word
 214  * boundary and the second has to follow directly thereafter.
 215  * We enforce this on all architectures even if they don't support
 216  * a double cmpxchg instruction, since it's a cheap requirement, and it
 217  * avoids breaking the requirement for architectures with the instruction.
 218  */
 219 #define __pcpu_double_call_return_bool(stem, pcp1, pcp2, ...)           \
 220 ({                                                                      \
 221         bool pdcrb_ret__;                                               \
 222         __verify_pcpu_ptr(&pcp1);                                       \
 223         BUILD_BUG_ON(sizeof(pcp1) != sizeof(pcp2));                     \
 224         VM_BUG_ON((unsigned long)(&pcp1) % (2 * sizeof(pcp1)));         \
 225         VM_BUG_ON((unsigned long)(&pcp2) !=                             \
 226                   (unsigned long)(&pcp1) + sizeof(pcp1));               \
 227         switch(sizeof(pcp1)) {                                          \
 228         case 1: pdcrb_ret__ = stem##1(pcp1, pcp2, __VA_ARGS__); break;  \
 229         case 2: pdcrb_ret__ = stem##2(pcp1, pcp2, __VA_ARGS__); break;  \
 230         case 4: pdcrb_ret__ = stem##4(pcp1, pcp2, __VA_ARGS__); break;  \
 231         case 8: pdcrb_ret__ = stem##8(pcp1, pcp2, __VA_ARGS__); break;  \
 232         default:                                                        \
 233                 __bad_size_call_parameter(); break;                     \
 234         }                                                               \
 235         pdcrb_ret__;                                                    \
 236 })
 237
 238 #define __pcpu_size_call(stem, variable, ...)                           \
 239 do {                                                                    \
 240         __verify_pcpu_ptr(&(variable));                                 \
 241         switch(sizeof(variable)) {                                      \
 242                 case 1: stem##1(variable, __VA_ARGS__);break;           \
 243                 case 2: stem##2(variable, __VA_ARGS__);break;           \
 244                 case 4: stem##4(variable, __VA_ARGS__);break;           \
 245                 case 8: stem##8(variable, __VA_ARGS__);break;           \
 246                 default:                                                \
 247                         __bad_size_call_parameter();break;              \
 248         }                                                               \
 249 } while (0)
 250
 251 /*
 252  * this_cpu operations (C) 2008-2013 Christoph Lameter <cl@linux.com>
 253  *
 254  * Optimized manipulation for memory allocated through the per cpu
 255  * allocator or for addresses of per cpu variables.
 256  *
 257  * These operation guarantee exclusivity of access for other operations
 258  * on the *same* processor. The assumption is that per cpu data is only
 259  * accessed by a single processor instance (the current one).
 260  *
 261  * The first group is used for accesses that must be done in a
 262  * preemption safe way since we know that the context is not preempt
 263  * safe. Interrupts may occur. If the interrupt modifies the variable
 264  * too then RMW actions will not be reliable.
 265  *
 266  * The arch code can provide optimized functions in two ways:
 267  *
 268  * 1. Override the function completely. F.e. define this_cpu_add().
 269  *    The arch must then ensure that the various scalar format passed
 270  *    are handled correctly.
 271  *
 272  * 2. Provide functions for certain scalar sizes. F.e. provide
 273  *    this_cpu_add_2() to provide per cpu atomic operations for 2 byte
 274  *    sized RMW actions. If arch code does not provide operations for
 275  *    a scalar size then the fallback in the generic code will be
 276  *    used.
 277  */
 278
 279 #define _this_cpu_generic_read(pcp)                                     \
 280 ({      typeof(pcp) ret__;                                              \
 281         preempt_disable();                                              \
 282         ret__ = *this_cpu_ptr(&(pcp));                                  \
 283         preempt_enable();                                               \
 284         ret__;                                                          \
 285 })
 286
 287 #ifndef this_cpu_read
 288 # ifndef this_cpu_read_1
 289 #  define this_cpu_read_1(pcp)  _this_cpu_generic_read(pcp)
 290 # endif
 291 # ifndef this_cpu_read_2
 292 #  define this_cpu_read_2(pcp)  _this_cpu_generic_read(pcp)
 293 # endif
 294 # ifndef this_cpu_read_4
 295 #  define this_cpu_read_4(pcp)  _this_cpu_generic_read(pcp)
 296 # endif
 297 # ifndef this_cpu_read_8
 298 #  define this_cpu_read_8(pcp)  _this_cpu_generic_read(pcp)
 299 # endif
 300 # define this_cpu_read(pcp)     __pcpu_size_call_return(this_cpu_read_, (pcp))
 301 #endif
 302
 303 #define _this_cpu_generic_to_op(pcp, val, op)                           \
 304 do {                                                                    \
 305         unsigned long flags;                                            \
 306         raw_local_irq_save(flags);                                      \
 307         *raw_cpu_ptr(&(pcp)) op val;                                    \
 308         raw_local_irq_restore(flags);                                   \
 309 } while (0)
 310
 311 #ifndef this_cpu_write
 312 # ifndef this_cpu_write_1
 313 #  define this_cpu_write_1(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 314 # endif
 315 # ifndef this_cpu_write_2
 316 #  define this_cpu_write_2(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 317 # endif
 318 # ifndef this_cpu_write_4
 319 #  define this_cpu_write_4(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 320 # endif
 321 # ifndef this_cpu_write_8
 322 #  define this_cpu_write_8(pcp, val)    _this_cpu_generic_to_op((pcp), (val), =)
 323 # endif
 324 # define this_cpu_write(pcp, val)       __pcpu_size_call(this_cpu_write_, (pcp), (val))
 325 #endif
 326
 327 #ifndef this_cpu_add
 328 # ifndef this_cpu_add_1
 329 #  define this_cpu_add_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 330 # endif
 331 # ifndef this_cpu_add_2
 332 #  define this_cpu_add_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 333 # endif
 334 # ifndef this_cpu_add_4
 335 #  define this_cpu_add_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 336 # endif
 337 # ifndef this_cpu_add_8
 338 #  define this_cpu_add_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), +=)
 339 # endif
 340 # define this_cpu_add(pcp, val)         __pcpu_size_call(this_cpu_add_, (pcp), (val))
 341 #endif
 342
 343 #ifndef this_cpu_sub
 344 # define this_cpu_sub(pcp, val)         this_cpu_add((pcp), -(typeof(pcp))(val))
 345 #endif
 346
 347 #ifndef this_cpu_inc
 348 # define this_cpu_inc(pcp)              this_cpu_add((pcp), 1)
 349 #endif
 350
 351 #ifndef this_cpu_dec
 352 # define this_cpu_dec(pcp)              this_cpu_sub((pcp), 1)
 353 #endif
 354
 355 #ifndef this_cpu_and
 356 # ifndef this_cpu_and_1
 357 #  define this_cpu_and_1(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 358 # endif
 359 # ifndef this_cpu_and_2
 360 #  define this_cpu_and_2(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 361 # endif
 362 # ifndef this_cpu_and_4
 363 #  define this_cpu_and_4(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 364 # endif
 365 # ifndef this_cpu_and_8
 366 #  define this_cpu_and_8(pcp, val)      _this_cpu_generic_to_op((pcp), (val), &=)
 367 # endif
 368 # define this_cpu_and(pcp, val)         __pcpu_size_call(this_cpu_and_, (pcp), (val))
 369 #endif
 370
 371 #ifndef this_cpu_or
 372 # ifndef this_cpu_or_1
 373 #  define this_cpu_or_1(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 374 # endif
 375 # ifndef this_cpu_or_2
 376 #  define this_cpu_or_2(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 377 # endif
 378 # ifndef this_cpu_or_4
 379 #  define this_cpu_or_4(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 380 # endif
 381 # ifndef this_cpu_or_8
 382 #  define this_cpu_or_8(pcp, val)       _this_cpu_generic_to_op((pcp), (val), |=)
 383 # endif
 384 # define this_cpu_or(pcp, val)          __pcpu_size_call(this_cpu_or_, (pcp), (val))
 385 #endif
 386
 387 #define _this_cpu_generic_add_return(pcp, val)                          \
 388 ({                                                                      \
 389         typeof(pcp) ret__;                                              \
 390         unsigned long flags;                                            \
 391         raw_local_irq_save(flags);                                      \
 392         raw_cpu_add(pcp, val);                                  \
 393         ret__ = raw_cpu_read(pcp);                                      \
 394         raw_local_irq_restore(flags);                                   \
 395         ret__;                                                          \
 396 })
 397
 398 #ifndef this_cpu_add_return
 399 # ifndef this_cpu_add_return_1
 400 #  define this_cpu_add_return_1(pcp, val)       _this_cpu_generic_add_return(pcp, val)
 401 # endif
 402 # ifndef this_cpu_add_return_2
 403 #  define this_cpu_add_return_2(pcp, val)       _this_cpu_generic_add_return(pcp, val)
 404 # endif
 405 # ifndef this_cpu_add_return_4
 406 #  define this_cpu_add_return_4(pcp, val)       _this_cpu_generic_add_return(pcp, val)
 407 # endif
 408 # ifndef this_cpu_add_return_8
 409 #  define this_cpu_add_return_8(pcp, val)       _this_cpu_generic_add_return(pcp, val)
 410 # endif
 411 # define this_cpu_add_return(pcp, val)  __pcpu_size_call_return2(this_cpu_add_return_, pcp, val)
 412 #endif
 413
 414 #define this_cpu_sub_return(pcp, val)   this_cpu_add_return(pcp, -(typeof(pcp))(val))
 415 #define this_cpu_inc_return(pcp)        this_cpu_add_return(pcp, 1)
 416 #define this_cpu_dec_return(pcp)        this_cpu_add_return(pcp, -1)
 417
 418 #define _this_cpu_generic_xchg(pcp, nval)                               \
 419 ({      typeof(pcp) ret__;                                              \
 420         unsigned long flags;                                            \
 421         raw_local_irq_save(flags);                                      \
 422         ret__ = raw_cpu_read(pcp);                                      \
 423         raw_cpu_write(pcp, nval);                                       \
 424         raw_local_irq_restore(flags);                                   \
 425         ret__;                                                          \
 426 })
 427
 428 #ifndef this_cpu_xchg
 429 # ifndef this_cpu_xchg_1
 430 #  define this_cpu_xchg_1(pcp, nval)    _this_cpu_generic_xchg(pcp, nval)
 431 # endif
 432 # ifndef this_cpu_xchg_2
 433 #  define this_cpu_xchg_2(pcp, nval)    _this_cpu_generic_xchg(pcp, nval)
 434 # endif
 435 # ifndef this_cpu_xchg_4
 436 #  define this_cpu_xchg_4(pcp, nval)    _this_cpu_generic_xchg(pcp, nval)
 437 # endif
 438 # ifndef this_cpu_xchg_8
 439 #  define this_cpu_xchg_8(pcp, nval)    _this_cpu_generic_xchg(pcp, nval)
 440 # endif
 441 # define this_cpu_xchg(pcp, nval)       \
 442         __pcpu_size_call_return2(this_cpu_xchg_, (pcp), nval)
 443 #endif
 444
 445 #define _this_cpu_generic_cmpxchg(pcp, oval, nval)                      \
 446 ({                                                                      \
 447         typeof(pcp) ret__;                                              \
 448         unsigned long flags;                                            \
 449         raw_local_irq_save(flags);                                      \
 450         ret__ = raw_cpu_read(pcp);                                      \
 451         if (ret__ == (oval))                                            \
 452                 raw_cpu_write(pcp, nval);                               \
 453         raw_local_irq_restore(flags);                                   \
 454         ret__;                                                          \
 455 })
 456
 457 #ifndef this_cpu_cmpxchg
 458 # ifndef this_cpu_cmpxchg_1
 459 #  define this_cpu_cmpxchg_1(pcp, oval, nval)   _this_cpu_generic_cmpxchg(pcp, oval, nval)
 460 # endif
 461 # ifndef this_cpu_cmpxchg_2
 462 #  define this_cpu_cmpxchg_2(pcp, oval, nval)   _this_cpu_generic_cmpxchg(pcp, oval, nval)
 463 # endif
 464 # ifndef this_cpu_cmpxchg_4
 465 #  define this_cpu_cmpxchg_4(pcp, oval, nval)   _this_cpu_generic_cmpxchg(pcp, oval, nval)
 466 # endif
 467 # ifndef this_cpu_cmpxchg_8
 468 #  define this_cpu_cmpxchg_8(pcp, oval, nval)   _this_cpu_generic_cmpxchg(pcp, oval, nval)
 469 # endif
 470 # define this_cpu_cmpxchg(pcp, oval, nval)      \
 471         __pcpu_size_call_return2(this_cpu_cmpxchg_, pcp, oval, nval)
 472 #endif
 473
 474 /*
 475  * cmpxchg_double replaces two adjacent scalars at once.  The first
 476  * two parameters are per cpu variables which have to be of the same
 477  * size.  A truth value is returned to indicate success or failure
 478  * (since a double register result is difficult to handle).  There is
 479  * very limited hardware support for these operations, so only certain
 480  * sizes may work.
 481  */
 482 #define _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)        \
 483 ({                                                                      \
 484         int ret__;                                                      \
 485         unsigned long flags;                                            \
 486         raw_local_irq_save(flags);                                      \
 487         ret__ = raw_cpu_generic_cmpxchg_double(pcp1, pcp2,              \
 488                         oval1, oval2, nval1, nval2);                    \
 489         raw_local_irq_restore(flags);                                   \
 490         ret__;                                                          \
 491 })
 492
 493 #ifndef this_cpu_cmpxchg_double
 494 # ifndef this_cpu_cmpxchg_double_1
 495 #  define this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2)     \
 496         _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 497 # endif
 498 # ifndef this_cpu_cmpxchg_double_2
 499 #  define this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2)     \
 500         _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 501 # endif
 502 # ifndef this_cpu_cmpxchg_double_4
 503 #  define this_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2)     \
 504         _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 505 # endif
 506 # ifndef this_cpu_cmpxchg_double_8
 507 #  define this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2)     \
 508         _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 509 # endif
 510 # define this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)        \
 511         __pcpu_double_call_return_bool(this_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2))
 512 #endif
 513
 514 /*
 515  * Generic percpu operations for contexts where we do not want to do
 516  * any checks for preemptiosn.
 517  *
 518  * If there is no other protection through preempt disable and/or
 519  * disabling interupts then one of these RMW operations can show unexpected
 520  * behavior because the execution thread was rescheduled on another processor
 521  * or an interrupt occurred and the same percpu variable was modified from
 522  * the interrupt context.
 523  */
 524 #ifndef raw_cpu_read
 525 # ifndef raw_cpu_read_1
 526 #  define raw_cpu_read_1(pcp)   (*raw_cpu_ptr(&(pcp)))
 527 # endif
 528 # ifndef raw_cpu_read_2
 529 #  define raw_cpu_read_2(pcp)   (*raw_cpu_ptr(&(pcp)))
 530 # endif
 531 # ifndef raw_cpu_read_4
 532 #  define raw_cpu_read_4(pcp)   (*raw_cpu_ptr(&(pcp)))
 533 # endif
 534 # ifndef raw_cpu_read_8
 535 #  define raw_cpu_read_8(pcp)   (*raw_cpu_ptr(&(pcp)))
 536 # endif
 537 # define raw_cpu_read(pcp)      __pcpu_size_call_return(raw_cpu_read_, (pcp))
 538 #endif
 539
 540 #define raw_cpu_generic_to_op(pcp, val, op)                             \
 541 do {                                                                    \
 542         *raw_cpu_ptr(&(pcp)) op val;                                    \
 543 } while (0)
 544
 545
 546 #ifndef raw_cpu_write
 547 # ifndef raw_cpu_write_1
 548 #  define raw_cpu_write_1(pcp, val)     raw_cpu_generic_to_op((pcp), (val), =)
 549 # endif
 550 # ifndef raw_cpu_write_2
 551 #  define raw_cpu_write_2(pcp, val)     raw_cpu_generic_to_op((pcp), (val), =)
 552 # endif
 553 # ifndef raw_cpu_write_4
 554 #  define raw_cpu_write_4(pcp, val)     raw_cpu_generic_to_op((pcp), (val), =)
 555 # endif
 556 # ifndef raw_cpu_write_8
 557 #  define raw_cpu_write_8(pcp, val)     raw_cpu_generic_to_op((pcp), (val), =)
 558 # endif
 559 # define raw_cpu_write(pcp, val)        __pcpu_size_call(raw_cpu_write_, (pcp), (val))
 560 #endif
 561
 562 #ifndef raw_cpu_add
 563 # ifndef raw_cpu_add_1
 564 #  define raw_cpu_add_1(pcp, val)       raw_cpu_generic_to_op((pcp), (val), +=)
 565 # endif
 566 # ifndef raw_cpu_add_2
 567 #  define raw_cpu_add_2(pcp, val)       raw_cpu_generic_to_op((pcp), (val), +=)
 568 # endif
 569 # ifndef raw_cpu_add_4
 570 #  define raw_cpu_add_4(pcp, val)       raw_cpu_generic_to_op((pcp), (val), +=)
 571 # endif
 572 # ifndef raw_cpu_add_8
 573 #  define raw_cpu_add_8(pcp, val)       raw_cpu_generic_to_op((pcp), (val), +=)
 574 # endif
 575 # define raw_cpu_add(pcp, val)  __pcpu_size_call(raw_cpu_add_, (pcp), (val))
 576 #endif
 577
 578 #ifndef raw_cpu_sub
 579 # define raw_cpu_sub(pcp, val)  raw_cpu_add((pcp), -(val))
 580 #endif
 581
 582 #ifndef raw_cpu_inc
 583 # define raw_cpu_inc(pcp)               raw_cpu_add((pcp), 1)
 584 #endif
 585
 586 #ifndef raw_cpu_dec
 587 # define raw_cpu_dec(pcp)               raw_cpu_sub((pcp), 1)
 588 #endif
 589
 590 #ifndef raw_cpu_and
 591 # ifndef raw_cpu_and_1
 592 #  define raw_cpu_and_1(pcp, val)       raw_cpu_generic_to_op((pcp), (val), &=)
 593 # endif
 594 # ifndef raw_cpu_and_2
 595 #  define raw_cpu_and_2(pcp, val)       raw_cpu_generic_to_op((pcp), (val), &=)
 596 # endif
 597 # ifndef raw_cpu_and_4
 598 #  define raw_cpu_and_4(pcp, val)       raw_cpu_generic_to_op((pcp), (val), &=)
 599 # endif
 600 # ifndef raw_cpu_and_8
 601 #  define raw_cpu_and_8(pcp, val)       raw_cpu_generic_to_op((pcp), (val), &=)
 602 # endif
 603 # define raw_cpu_and(pcp, val)  __pcpu_size_call(raw_cpu_and_, (pcp), (val))
 604 #endif
 605
 606 #ifndef raw_cpu_or
 607 # ifndef raw_cpu_or_1
 608 #  define raw_cpu_or_1(pcp, val)        raw_cpu_generic_to_op((pcp), (val), |=)
 609 # endif
 610 # ifndef raw_cpu_or_2
 611 #  define raw_cpu_or_2(pcp, val)        raw_cpu_generic_to_op((pcp), (val), |=)
 612 # endif
 613 # ifndef raw_cpu_or_4
 614 #  define raw_cpu_or_4(pcp, val)        raw_cpu_generic_to_op((pcp), (val), |=)
 615 # endif
 616 # ifndef raw_cpu_or_8
 617 #  define raw_cpu_or_8(pcp, val)        raw_cpu_generic_to_op((pcp), (val), |=)
 618 # endif
 619 # define raw_cpu_or(pcp, val)   __pcpu_size_call(raw_cpu_or_, (pcp), (val))
 620 #endif
 621
 622 #define raw_cpu_generic_add_return(pcp, val)                            \
 623 ({                                                                      \
 624         raw_cpu_add(pcp, val);                                          \
 625         raw_cpu_read(pcp);                                              \
 626 })
 627
 628 #ifndef raw_cpu_add_return
 629 # ifndef raw_cpu_add_return_1
 630 #  define raw_cpu_add_return_1(pcp, val)        raw_cpu_generic_add_return(pcp, val)
 631 # endif
 632 # ifndef raw_cpu_add_return_2
 633 #  define raw_cpu_add_return_2(pcp, val)        raw_cpu_generic_add_return(pcp, val)
 634 # endif
 635 # ifndef raw_cpu_add_return_4
 636 #  define raw_cpu_add_return_4(pcp, val)        raw_cpu_generic_add_return(pcp, val)
 637 # endif
 638 # ifndef raw_cpu_add_return_8
 639 #  define raw_cpu_add_return_8(pcp, val)        raw_cpu_generic_add_return(pcp, val)
 640 # endif
 641 # define raw_cpu_add_return(pcp, val)   \
 642         __pcpu_size_call_return2(raw_cpu_add_return_, pcp, val)
 643 #endif
 644
 645 #define raw_cpu_sub_return(pcp, val)    raw_cpu_add_return(pcp, -(typeof(pcp))(val))
 646 #define raw_cpu_inc_return(pcp) raw_cpu_add_return(pcp, 1)
 647 #define raw_cpu_dec_return(pcp) raw_cpu_add_return(pcp, -1)
 648
 649 #define raw_cpu_generic_xchg(pcp, nval)                                 \
 650 ({      typeof(pcp) ret__;                                              \
 651         ret__ = raw_cpu_read(pcp);                                      \
 652         raw_cpu_write(pcp, nval);                                       \
 653         ret__;                                                          \
 654 })
 655
 656 #ifndef raw_cpu_xchg
 657 # ifndef raw_cpu_xchg_1
 658 #  define raw_cpu_xchg_1(pcp, nval)     raw_cpu_generic_xchg(pcp, nval)
 659 # endif
 660 # ifndef raw_cpu_xchg_2
 661 #  define raw_cpu_xchg_2(pcp, nval)     raw_cpu_generic_xchg(pcp, nval)
 662 # endif
 663 # ifndef raw_cpu_xchg_4
 664 #  define raw_cpu_xchg_4(pcp, nval)     raw_cpu_generic_xchg(pcp, nval)
 665 # endif
 666 # ifndef raw_cpu_xchg_8
 667 #  define raw_cpu_xchg_8(pcp, nval)     raw_cpu_generic_xchg(pcp, nval)
 668 # endif
 669 # define raw_cpu_xchg(pcp, nval)        \
 670         __pcpu_size_call_return2(raw_cpu_xchg_, (pcp), nval)
 671 #endif
 672
 673 #define raw_cpu_generic_cmpxchg(pcp, oval, nval)                        \
 674 ({                                                                      \
 675         typeof(pcp) ret__;                                              \
 676         ret__ = raw_cpu_read(pcp);                                      \
 677         if (ret__ == (oval))                                            \
 678                 raw_cpu_write(pcp, nval);                               \
 679         ret__;                                                          \
 680 })
 681
 682 #ifndef raw_cpu_cmpxchg
 683 # ifndef raw_cpu_cmpxchg_1
 684 #  define raw_cpu_cmpxchg_1(pcp, oval, nval)    raw_cpu_generic_cmpxchg(pcp, oval, nval)
 685 # endif
 686 # ifndef raw_cpu_cmpxchg_2
 687 #  define raw_cpu_cmpxchg_2(pcp, oval, nval)    raw_cpu_generic_cmpxchg(pcp, oval, nval)
 688 # endif
 689 # ifndef raw_cpu_cmpxchg_4
 690 #  define raw_cpu_cmpxchg_4(pcp, oval, nval)    raw_cpu_generic_cmpxchg(pcp, oval, nval)
 691 # endif
 692 # ifndef raw_cpu_cmpxchg_8
 693 #  define raw_cpu_cmpxchg_8(pcp, oval, nval)    raw_cpu_generic_cmpxchg(pcp, oval, nval)
 694 # endif
 695 # define raw_cpu_cmpxchg(pcp, oval, nval)       \
 696         __pcpu_size_call_return2(raw_cpu_cmpxchg_, pcp, oval, nval)
 697 #endif
 698
 699 #define raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)  \
 700 ({                                                                      \
 701         int __ret = 0;                                                  \
 702         if (raw_cpu_read(pcp1) == (oval1) &&                            \
 703                          raw_cpu_read(pcp2)  == (oval2)) {              \
 704                 raw_cpu_write(pcp1, (nval1));                           \
 705                 raw_cpu_write(pcp2, (nval2));                           \
 706                 __ret = 1;                                              \
 707         }                                                               \
 708         (__ret);                                                        \
 709 })
 710
 711 #ifndef raw_cpu_cmpxchg_double
 712 # ifndef raw_cpu_cmpxchg_double_1
 713 #  define raw_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2)      \
 714         raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 715 # endif
 716 # ifndef raw_cpu_cmpxchg_double_2
 717 #  define raw_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2)      \
 718         raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 719 # endif
 720 # ifndef raw_cpu_cmpxchg_double_4
 721 #  define raw_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2)      \
 722         raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 723 # endif
 724 # ifndef raw_cpu_cmpxchg_double_8
 725 #  define raw_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2)      \
 726         raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)
 727 # endif
 728 # define raw_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
 729         __pcpu_double_call_return_bool(raw_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2))
 730 #endif
 731
 732 /*
 733  * Generic percpu operations for context that are safe from preemption/interrupts.
 734  */
 735 #ifndef __this_cpu_read
 736 # define __this_cpu_read(pcp) \
 737         (__this_cpu_preempt_check("read"),__pcpu_size_call_return(raw_cpu_read_, (pcp)))
 738 #endif
 739
 740 #ifndef __this_cpu_write
 741 # define __this_cpu_write(pcp, val)                                     \
 742 do { __this_cpu_preempt_check("write");                                 \
 743      __pcpu_size_call(raw_cpu_write_, (pcp), (val));                    \
 744 } while (0)
 745 #endif
 746
 747 #ifndef __this_cpu_add
 748 # define __this_cpu_add(pcp, val)                                        \
 749 do { __this_cpu_preempt_check("add");                                   \
 750         __pcpu_size_call(raw_cpu_add_, (pcp), (val));                   \
 751 } while (0)
 752 #endif
 753
 754 #ifndef __this_cpu_sub
 755 # define __this_cpu_sub(pcp, val)       __this_cpu_add((pcp), -(typeof(pcp))(val))
 756 #endif
 757
 758 #ifndef __this_cpu_inc
 759 # define __this_cpu_inc(pcp)            __this_cpu_add((pcp), 1)
 760 #endif
 761
 762 #ifndef __this_cpu_dec
 763 # define __this_cpu_dec(pcp)            __this_cpu_sub((pcp), 1)
 764 #endif
 765
 766 #ifndef __this_cpu_and
 767 # define __this_cpu_and(pcp, val)                                       \
 768 do { __this_cpu_preempt_check("and");                                   \
 769         __pcpu_size_call(raw_cpu_and_, (pcp), (val));                   \
 770 } while (0)
 771
 772 #endif
 773
 774 #ifndef __this_cpu_or
 775 # define __this_cpu_or(pcp, val)                                        \
 776 do { __this_cpu_preempt_check("or");                                    \
 777         __pcpu_size_call(raw_cpu_or_, (pcp), (val));                    \
 778 } while (0)
 779 #endif
 780
 781 #ifndef __this_cpu_add_return
 782 # define __this_cpu_add_return(pcp, val)        \
 783         (__this_cpu_preempt_check("add_return"),__pcpu_size_call_return2(raw_cpu_add_return_, pcp, val))
 784 #endif
 785
 786 #define __this_cpu_sub_return(pcp, val) __this_cpu_add_return(pcp, -(typeof(pcp))(val))
 787 #define __this_cpu_inc_return(pcp)      __this_cpu_add_return(pcp, 1)
 788 #define __this_cpu_dec_return(pcp)      __this_cpu_add_return(pcp, -1)
 789
 790 #ifndef __this_cpu_xchg
 791 # define __this_cpu_xchg(pcp, nval)     \
 792         (__this_cpu_preempt_check("xchg"),__pcpu_size_call_return2(raw_cpu_xchg_, (pcp), nval))
 793 #endif
 794
 795 #ifndef __this_cpu_cmpxchg
 796 # define __this_cpu_cmpxchg(pcp, oval, nval)    \
 797         (__this_cpu_preempt_check("cmpxchg"),__pcpu_size_call_return2(raw_cpu_cmpxchg_, pcp, oval, nval))
 798 #endif
 799
 800 #ifndef __this_cpu_cmpxchg_double
 801 # define __this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2)      \
 802         (__this_cpu_preempt_check("cmpxchg_double"),__pcpu_double_call_return_bool(raw_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2)))
 803 #endif
 804
 805 #endif /* __LINUX_PERCPU_H */