| 1 | /* MECHANICALLY GENERATED, DO NOT EDIT!!! */ |
| 2 | |
| 3 | #define _INCLUDE_API_H |
| 4 | |
| 5 | /* |
| 6 | * common.h: Common Linux kernel-isms. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; but version 2 of the License only due |
| 11 | * to code included from the Linux kernel. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 21 | * |
| 22 | * Copyright (c) 2006 Paul E. McKenney, IBM. |
| 23 | * |
| 24 | * Much code taken from the Linux kernel. For such code, the option |
| 25 | * to redistribute under later versions of GPL might not be available. |
| 26 | */ |
| 27 | |
| 28 | #ifndef __always_inline |
| 29 | #define __always_inline inline |
| 30 | #endif |
| 31 | |
| 32 | #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) |
| 33 | #define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1) |
| 34 | |
| 35 | #ifdef __ASSEMBLY__ |
| 36 | # define stringify_in_c(...) __VA_ARGS__ |
| 37 | # define ASM_CONST(x) x |
| 38 | #else |
| 39 | /* This version of stringify will deal with commas... */ |
| 40 | # define __stringify_in_c(...) #__VA_ARGS__ |
| 41 | # define stringify_in_c(...) __stringify_in_c(__VA_ARGS__) " " |
| 42 | # define __ASM_CONST(x) x##UL |
| 43 | # define ASM_CONST(x) __ASM_CONST(x) |
| 44 | #endif |
| 45 | |
| 46 | |
| 47 | /* |
| 48 | * arch-ppc64.h: Expose PowerPC atomic instructions. |
| 49 | * |
| 50 | * This program is free software; you can redistribute it and/or modify |
| 51 | * it under the terms of the GNU General Public License as published by |
| 52 | * the Free Software Foundation; but version 2 of the License only due |
| 53 | * to code included from the Linux kernel. |
| 54 | * |
| 55 | * This program is distributed in the hope that it will be useful, |
| 56 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 57 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 58 | * GNU General Public License for more details. |
| 59 | * |
| 60 | * You should have received a copy of the GNU General Public License |
| 61 | * along with this program; if not, write to the Free Software |
| 62 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 63 | * |
| 64 | * Copyright (c) 2006 Paul E. McKenney, IBM. |
| 65 | * |
| 66 | * Much code taken from the Linux kernel. For such code, the option |
| 67 | * to redistribute under later versions of GPL might not be available. |
| 68 | */ |
| 69 | |
| 70 | /* |
| 71 | * Machine parameters. |
| 72 | */ |
| 73 | |
| 74 | #define CONFIG_SMP |
| 75 | #define CONFIG_PPC64 |
| 76 | |
| 77 | #define CACHE_LINE_SIZE 128 |
| 78 | #define ____cacheline_internodealigned_in_smp \ |
| 79 | __attribute__((__aligned__(1 << 7))) |
| 80 | |
| 81 | /* |
| 82 | * Atomic data structure, initialization, and access. |
| 83 | */ |
| 84 | |
| 85 | typedef struct { volatile int counter; } atomic_t; |
| 86 | |
| 87 | #define ATOMIC_INIT(i) { (i) } |
| 88 | |
| 89 | #define atomic_read(v) ((v)->counter) |
| 90 | #define atomic_set(v, i) (((v)->counter) = (i)) |
| 91 | |
| 92 | /* |
| 93 | * Atomic operations. |
| 94 | */ |
| 95 | |
| 96 | #define LWSYNC lwsync |
| 97 | #define PPC405_ERR77(ra,rb) |
| 98 | #ifdef CONFIG_SMP |
| 99 | # define LWSYNC_ON_SMP stringify_in_c(LWSYNC) "\n" |
| 100 | # define ISYNC_ON_SMP "\n\tisync\n" |
| 101 | #else |
| 102 | # define LWSYNC_ON_SMP |
| 103 | # define ISYNC_ON_SMP |
| 104 | #endif |
| 105 | |
| 106 | |
| 107 | /* |
| 108 | * Atomic exchange |
| 109 | * |
| 110 | * Changes the memory location '*ptr' to be val and returns |
| 111 | * the previous value stored there. |
| 112 | */ |
| 113 | static __always_inline unsigned long |
| 114 | __xchg_u32(volatile void *p, unsigned long val) |
| 115 | { |
| 116 | unsigned long prev; |
| 117 | |
| 118 | __asm__ __volatile__( |
| 119 | LWSYNC_ON_SMP |
| 120 | "1: lwarx %0,0,%2 \n" |
| 121 | PPC405_ERR77(0,%2) |
| 122 | " stwcx. %3,0,%2 \n\ |
| 123 | bne- 1b" |
| 124 | ISYNC_ON_SMP |
| 125 | : "=&r" (prev), "+m" (*(volatile unsigned int *)p) |
| 126 | : "r" (p), "r" (val) |
| 127 | : "cc", "memory"); |
| 128 | |
| 129 | return prev; |
| 130 | } |
| 131 | |
| 132 | /* |
| 133 | * Atomic exchange |
| 134 | * |
| 135 | * Changes the memory location '*ptr' to be val and returns |
| 136 | * the previous value stored there. |
| 137 | */ |
| 138 | static __always_inline unsigned long |
| 139 | __xchg_u32_local(volatile void *p, unsigned long val) |
| 140 | { |
| 141 | unsigned long prev; |
| 142 | |
| 143 | __asm__ __volatile__( |
| 144 | "1: lwarx %0,0,%2 \n" |
| 145 | PPC405_ERR77(0,%2) |
| 146 | " stwcx. %3,0,%2 \n\ |
| 147 | bne- 1b" |
| 148 | : "=&r" (prev), "+m" (*(volatile unsigned int *)p) |
| 149 | : "r" (p), "r" (val) |
| 150 | : "cc", "memory"); |
| 151 | |
| 152 | return prev; |
| 153 | } |
| 154 | |
| 155 | #ifdef CONFIG_PPC64 |
| 156 | static __always_inline unsigned long |
| 157 | __xchg_u64(volatile void *p, unsigned long val) |
| 158 | { |
| 159 | unsigned long prev; |
| 160 | |
| 161 | __asm__ __volatile__( |
| 162 | LWSYNC_ON_SMP |
| 163 | "1: ldarx %0,0,%2 \n" |
| 164 | PPC405_ERR77(0,%2) |
| 165 | " stdcx. %3,0,%2 \n\ |
| 166 | bne- 1b" |
| 167 | ISYNC_ON_SMP |
| 168 | : "=&r" (prev), "+m" (*(volatile unsigned long *)p) |
| 169 | : "r" (p), "r" (val) |
| 170 | : "cc", "memory"); |
| 171 | |
| 172 | return prev; |
| 173 | } |
| 174 | |
| 175 | static __always_inline unsigned long |
| 176 | __xchg_u64_local(volatile void *p, unsigned long val) |
| 177 | { |
| 178 | unsigned long prev; |
| 179 | |
| 180 | __asm__ __volatile__( |
| 181 | "1: ldarx %0,0,%2 \n" |
| 182 | PPC405_ERR77(0,%2) |
| 183 | " stdcx. %3,0,%2 \n\ |
| 184 | bne- 1b" |
| 185 | : "=&r" (prev), "+m" (*(volatile unsigned long *)p) |
| 186 | : "r" (p), "r" (val) |
| 187 | : "cc", "memory"); |
| 188 | |
| 189 | return prev; |
| 190 | } |
| 191 | #endif |
| 192 | |
| 193 | /* |
| 194 | * This function doesn't exist, so you'll get a linker error |
| 195 | * if something tries to do an invalid xchg(). |
| 196 | */ |
| 197 | extern void __xchg_called_with_bad_pointer(void); |
| 198 | |
| 199 | static __always_inline unsigned long |
| 200 | __xchg(volatile void *ptr, unsigned long x, unsigned int size) |
| 201 | { |
| 202 | switch (size) { |
| 203 | case 4: |
| 204 | return __xchg_u32(ptr, x); |
| 205 | #ifdef CONFIG_PPC64 |
| 206 | case 8: |
| 207 | return __xchg_u64(ptr, x); |
| 208 | #endif |
| 209 | } |
| 210 | __xchg_called_with_bad_pointer(); |
| 211 | return x; |
| 212 | } |
| 213 | |
| 214 | static __always_inline unsigned long |
| 215 | __xchg_local(volatile void *ptr, unsigned long x, unsigned int size) |
| 216 | { |
| 217 | switch (size) { |
| 218 | case 4: |
| 219 | return __xchg_u32_local(ptr, x); |
| 220 | #ifdef CONFIG_PPC64 |
| 221 | case 8: |
| 222 | return __xchg_u64_local(ptr, x); |
| 223 | #endif |
| 224 | } |
| 225 | __xchg_called_with_bad_pointer(); |
| 226 | return x; |
| 227 | } |
| 228 | #define xchg(ptr,x) \ |
| 229 | ({ \ |
| 230 | __typeof__(*(ptr)) _x_ = (x); \ |
| 231 | (__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_, sizeof(*(ptr))); \ |
| 232 | }) |
| 233 | |
| 234 | #define xchg_local(ptr,x) \ |
| 235 | ({ \ |
| 236 | __typeof__(*(ptr)) _x_ = (x); \ |
| 237 | (__typeof__(*(ptr))) __xchg_local((ptr), \ |
| 238 | (unsigned long)_x_, sizeof(*(ptr))); \ |
| 239 | }) |
| 240 | |
| 241 | /* |
| 242 | * Compare and exchange - if *p == old, set it to new, |
| 243 | * and return the old value of *p. |
| 244 | */ |
| 245 | #define __HAVE_ARCH_CMPXCHG 1 |
| 246 | |
| 247 | static __always_inline unsigned long |
| 248 | __cmpxchg_u32(volatile unsigned int *p, unsigned long old, unsigned long new) |
| 249 | { |
| 250 | unsigned int prev; |
| 251 | |
| 252 | __asm__ __volatile__ ( |
| 253 | LWSYNC_ON_SMP |
| 254 | "1: lwarx %0,0,%2 # __cmpxchg_u32\n\ |
| 255 | cmpw 0,%0,%3\n\ |
| 256 | bne- 2f\n" |
| 257 | PPC405_ERR77(0,%2) |
| 258 | " stwcx. %4,0,%2\n\ |
| 259 | bne- 1b" |
| 260 | ISYNC_ON_SMP |
| 261 | "\n\ |
| 262 | 2:" |
| 263 | : "=&r" (prev), "+m" (*p) |
| 264 | : "r" (p), "r" (old), "r" (new) |
| 265 | : "cc", "memory"); |
| 266 | |
| 267 | return prev; |
| 268 | } |
| 269 | |
| 270 | static __always_inline unsigned long |
| 271 | __cmpxchg_u32_local(volatile unsigned int *p, unsigned long old, |
| 272 | unsigned long new) |
| 273 | { |
| 274 | unsigned int prev; |
| 275 | |
| 276 | __asm__ __volatile__ ( |
| 277 | "1: lwarx %0,0,%2 # __cmpxchg_u32\n\ |
| 278 | cmpw 0,%0,%3\n\ |
| 279 | bne- 2f\n" |
| 280 | PPC405_ERR77(0,%2) |
| 281 | " stwcx. %4,0,%2\n\ |
| 282 | bne- 1b" |
| 283 | "\n\ |
| 284 | 2:" |
| 285 | : "=&r" (prev), "+m" (*p) |
| 286 | : "r" (p), "r" (old), "r" (new) |
| 287 | : "cc", "memory"); |
| 288 | |
| 289 | return prev; |
| 290 | } |
| 291 | |
| 292 | #ifdef CONFIG_PPC64 |
| 293 | static __always_inline unsigned long |
| 294 | __cmpxchg_u64(volatile unsigned long *p, unsigned long old, unsigned long new) |
| 295 | { |
| 296 | unsigned long prev; |
| 297 | |
| 298 | __asm__ __volatile__ ( |
| 299 | LWSYNC_ON_SMP |
| 300 | "1: ldarx %0,0,%2 # __cmpxchg_u64\n\ |
| 301 | cmpd 0,%0,%3\n\ |
| 302 | bne- 2f\n\ |
| 303 | stdcx. %4,0,%2\n\ |
| 304 | bne- 1b" |
| 305 | ISYNC_ON_SMP |
| 306 | "\n\ |
| 307 | 2:" |
| 308 | : "=&r" (prev), "+m" (*p) |
| 309 | : "r" (p), "r" (old), "r" (new) |
| 310 | : "cc", "memory"); |
| 311 | |
| 312 | return prev; |
| 313 | } |
| 314 | |
| 315 | static __always_inline unsigned long |
| 316 | __cmpxchg_u64_local(volatile unsigned long *p, unsigned long old, |
| 317 | unsigned long new) |
| 318 | { |
| 319 | unsigned long prev; |
| 320 | |
| 321 | __asm__ __volatile__ ( |
| 322 | "1: ldarx %0,0,%2 # __cmpxchg_u64\n\ |
| 323 | cmpd 0,%0,%3\n\ |
| 324 | bne- 2f\n\ |
| 325 | stdcx. %4,0,%2\n\ |
| 326 | bne- 1b" |
| 327 | "\n\ |
| 328 | 2:" |
| 329 | : "=&r" (prev), "+m" (*p) |
| 330 | : "r" (p), "r" (old), "r" (new) |
| 331 | : "cc", "memory"); |
| 332 | |
| 333 | return prev; |
| 334 | } |
| 335 | #endif |
| 336 | |
| 337 | /* This function doesn't exist, so you'll get a linker error |
| 338 | if something tries to do an invalid cmpxchg(). */ |
| 339 | extern void __cmpxchg_called_with_bad_pointer(void); |
| 340 | |
| 341 | static __always_inline unsigned long |
| 342 | __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, |
| 343 | unsigned int size) |
| 344 | { |
| 345 | switch (size) { |
| 346 | case 4: |
| 347 | return __cmpxchg_u32(ptr, old, new); |
| 348 | #ifdef CONFIG_PPC64 |
| 349 | case 8: |
| 350 | return __cmpxchg_u64(ptr, old, new); |
| 351 | #endif |
| 352 | } |
| 353 | __cmpxchg_called_with_bad_pointer(); |
| 354 | return old; |
| 355 | } |
| 356 | |
| 357 | static __always_inline unsigned long |
| 358 | __cmpxchg_local(volatile void *ptr, unsigned long old, unsigned long new, |
| 359 | unsigned int size) |
| 360 | { |
| 361 | switch (size) { |
| 362 | case 4: |
| 363 | return __cmpxchg_u32_local(ptr, old, new); |
| 364 | #ifdef CONFIG_PPC64 |
| 365 | case 8: |
| 366 | return __cmpxchg_u64_local(ptr, old, new); |
| 367 | #endif |
| 368 | } |
| 369 | __cmpxchg_called_with_bad_pointer(); |
| 370 | return old; |
| 371 | } |
| 372 | |
| 373 | #define cmpxchg(ptr, o, n) \ |
| 374 | ({ \ |
| 375 | __typeof__(*(ptr)) _o_ = (o); \ |
| 376 | __typeof__(*(ptr)) _n_ = (n); \ |
| 377 | (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \ |
| 378 | (unsigned long)_n_, sizeof(*(ptr))); \ |
| 379 | }) |
| 380 | |
| 381 | |
| 382 | #define cmpxchg_local(ptr, o, n) \ |
| 383 | ({ \ |
| 384 | __typeof__(*(ptr)) _o_ = (o); \ |
| 385 | __typeof__(*(ptr)) _n_ = (n); \ |
| 386 | (__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \ |
| 387 | (unsigned long)_n_, sizeof(*(ptr))); \ |
| 388 | }) |
| 389 | |
| 390 | #ifdef CONFIG_PPC64 |
| 391 | /* |
| 392 | * We handle most unaligned accesses in hardware. On the other hand |
| 393 | * unaligned DMA can be very expensive on some ppc64 IO chips (it does |
| 394 | * powers of 2 writes until it reaches sufficient alignment). |
| 395 | * |
| 396 | * Based on this we disable the IP header alignment in network drivers. |
| 397 | * We also modify NET_SKB_PAD to be a cacheline in size, thus maintaining |
| 398 | * cacheline alignment of buffers. |
| 399 | */ |
| 400 | #define NET_IP_ALIGN 0 |
| 401 | #define NET_SKB_PAD L1_CACHE_BYTES |
| 402 | |
| 403 | #define cmpxchg64(ptr, o, n) \ |
| 404 | ({ \ |
| 405 | BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ |
| 406 | cmpxchg((ptr), (o), (n)); \ |
| 407 | }) |
| 408 | #define cmpxchg64_local(ptr, o, n) \ |
| 409 | ({ \ |
| 410 | BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ |
| 411 | cmpxchg_local((ptr), (o), (n)); \ |
| 412 | }) |
| 413 | #endif |
| 414 | |
| 415 | #define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n))) |
| 416 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
| 417 | |
| 418 | /** |
| 419 | * atomic_add - add integer to atomic variable |
| 420 | * @i: integer value to add |
| 421 | * @v: pointer of type atomic_t |
| 422 | * |
| 423 | * Atomically adds @a to @v. |
| 424 | */ |
| 425 | static __inline__ void atomic_add(int a, atomic_t *v) |
| 426 | { |
| 427 | int t; |
| 428 | |
| 429 | __asm__ __volatile__( |
| 430 | "1: lwarx %0,0,%3 # atomic_add\n\ |
| 431 | add %0,%2,%0 \n\ |
| 432 | stwcx. %0,0,%3 \n\ |
| 433 | bne- 1b" |
| 434 | : "=&r" (t), "+m" (v->counter) |
| 435 | : "r" (a), "r" (&v->counter) |
| 436 | : "cc"); |
| 437 | } |
| 438 | |
| 439 | /** |
| 440 | * atomic_sub - subtract the atomic variable |
| 441 | * @i: integer value to subtract |
| 442 | * @v: pointer of type atomic_t |
| 443 | * |
| 444 | * Atomically subtracts @a from @v. |
| 445 | */ |
| 446 | static __inline__ void atomic_sub(int a, atomic_t *v) |
| 447 | { |
| 448 | int t; |
| 449 | |
| 450 | __asm__ __volatile__( |
| 451 | "1: lwarx %0,0,%3 # atomic_sub \n\ |
| 452 | subf %0,%2,%0 \n\ |
| 453 | stwcx. %0,0,%3 \n\ |
| 454 | bne- 1b" |
| 455 | : "=&r" (t), "+m" (v->counter) |
| 456 | : "r" (a), "r" (&v->counter) |
| 457 | : "cc"); |
| 458 | } |
| 459 | |
| 460 | static __inline__ atomic_sub_return(int a, atomic_t *v) |
| 461 | { |
| 462 | int t; |
| 463 | |
| 464 | __asm__ __volatile__( |
| 465 | "lwsync\n\ |
| 466 | 1: lwarx %0,0,%2 # atomic_sub_return\n\ |
| 467 | subf %0,%1,%0\n\ |
| 468 | stwcx. %0,0,%2 \n\ |
| 469 | bne- 1b \n\ |
| 470 | isync" |
| 471 | : "=&r" (t) |
| 472 | : "r" (a), "r" (&v->counter) |
| 473 | : "cc", "memory"); |
| 474 | |
| 475 | return t; |
| 476 | } |
| 477 | |
| 478 | /** |
| 479 | * atomic_sub_and_test - subtract value from variable and test result |
| 480 | * @i: integer value to subtract |
| 481 | * @v: pointer of type atomic_t |
| 482 | * |
| 483 | * Atomically subtracts @i from @v and returns |
| 484 | * true if the result is zero, or false for all |
| 485 | * other cases. |
| 486 | */ |
| 487 | static __inline__ int atomic_sub_and_test(int a, atomic_t *v) |
| 488 | { |
| 489 | return atomic_sub_return(a, v) == 0; |
| 490 | } |
| 491 | |
| 492 | /** |
| 493 | * atomic_inc - increment atomic variable |
| 494 | * @v: pointer of type atomic_t |
| 495 | * |
| 496 | * Atomically increments @v by 1. |
| 497 | */ |
| 498 | static __inline__ void atomic_inc(atomic_t *v) |
| 499 | { |
| 500 | atomic_add(1, v); |
| 501 | } |
| 502 | |
| 503 | /** |
| 504 | * atomic_dec - decrement atomic variable |
| 505 | * @v: pointer of type atomic_t |
| 506 | * |
| 507 | * Atomically decrements @v by 1. |
| 508 | */ |
| 509 | static __inline__ void atomic_dec(atomic_t *v) |
| 510 | { |
| 511 | atomic_sub(1, v); |
| 512 | } |
| 513 | |
| 514 | /** |
| 515 | * atomic_dec_and_test - decrement and test |
| 516 | * @v: pointer of type atomic_t |
| 517 | * |
| 518 | * Atomically decrements @v by 1 and |
| 519 | * returns true if the result is 0, or false for all other |
| 520 | * cases. |
| 521 | */ |
| 522 | static __inline__ int atomic_dec_and_test(atomic_t *v) |
| 523 | { |
| 524 | return atomic_sub_and_test(1, v); |
| 525 | } |
| 526 | |
| 527 | /** |
| 528 | * atomic_inc_and_test - increment and test |
| 529 | * @v: pointer of type atomic_t |
| 530 | * |
| 531 | * Atomically increments @v by 1 |
| 532 | * and returns true if the result is zero, or false for all |
| 533 | * other cases. |
| 534 | */ |
| 535 | static __inline__ int atomic_inc_and_test(atomic_t *v) |
| 536 | { |
| 537 | return atomic_inc_return(v); |
| 538 | } |
| 539 | |
| 540 | /** |
| 541 | * atomic_add_return - add and return |
| 542 | * @v: pointer of type atomic_t |
| 543 | * @i: integer value to add |
| 544 | * |
| 545 | * Atomically adds @i to @v and returns @i + @v |
| 546 | */ |
| 547 | static __inline__ int atomic_add_return(int a, atomic_t *v) |
| 548 | { |
| 549 | int t; |
| 550 | |
| 551 | __asm__ __volatile__( |
| 552 | "lwsync \n\ |
| 553 | 1: lwarx %0,0,%2 # atomic_add_return \n\ |
| 554 | add %0,%1,%0 \n\ |
| 555 | stwcx. %0,0,%2 \n\ |
| 556 | bne- 1b \n\ |
| 557 | isync" |
| 558 | : "=&r" (t) |
| 559 | : "r" (a), "r" (&v->counter) |
| 560 | : "cc", "memory"); |
| 561 | |
| 562 | return t; |
| 563 | } |
| 564 | |
| 565 | /** |
| 566 | * atomic_add_negative - add and test if negative |
| 567 | * @v: pointer of type atomic_t |
| 568 | * @i: integer value to add |
| 569 | * |
| 570 | * Atomically adds @i to @v and returns true |
| 571 | * if the result is negative, or false when |
| 572 | * result is greater than or equal to zero. |
| 573 | */ |
| 574 | static __inline__ int atomic_add_negative(int a, atomic_t *v) |
| 575 | { |
| 576 | return atomic_add_return(a, v) < 0; |
| 577 | } |
| 578 | |
| 579 | /** |
| 580 | * atomic_add_unless - add unless the number is a given value |
| 581 | * @v: pointer of type atomic_t |
| 582 | * @a: the amount to add to v... |
| 583 | * @u: ...unless v is equal to u. |
| 584 | * |
| 585 | * Atomically adds @a to @v, so long as it was not @u. |
| 586 | * Returns non-zero if @v was not @u, and zero otherwise. |
| 587 | */ |
| 588 | static __inline__ int atomic_add_unless(atomic_t *v, int a, int u) |
| 589 | { |
| 590 | int t; |
| 591 | |
| 592 | __asm__ __volatile__( |
| 593 | "lwsync \n\ |
| 594 | 1: lwarx %0,0,%1 # atomic_add_unless\n\ |
| 595 | cmpd 0,%0,%3 \n\ |
| 596 | beq- 2f \n\ |
| 597 | add %0,%2,%0 \n\ |
| 598 | stwcx. %0,0,%1 \n\ |
| 599 | bne- 1b \n\ |
| 600 | isync \n\ |
| 601 | subf %0,%2,%0 \n\ |
| 602 | 2:" |
| 603 | : "=&r" (t) |
| 604 | : "r" (&v->counter), "r" (a), "r" (u) |
| 605 | : "cc", "memory"); |
| 606 | |
| 607 | return t != u; |
| 608 | } |
| 609 | |
| 610 | #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) |
| 611 | |
| 612 | #define atomic_inc_return(v) (atomic_add_return(1,v)) |
| 613 | #define atomic_dec_return(v) (atomic_sub_return(1,v)) |
| 614 | |
| 615 | /* Atomic operations are already serializing on x86 */ |
| 616 | #define smp_mb__before_atomic_dec() smp_mb() |
| 617 | #define smp_mb__after_atomic_dec() smp_mb() |
| 618 | #define smp_mb__before_atomic_inc() smp_mb() |
| 619 | #define smp_mb__after_atomic_inc() smp_mb() |
| 620 | |
| 621 | #define smp_mb() __asm__ __volatile__("sync" : : : "memory") |
| 622 | |
| 623 | |
| 624 | /* |
| 625 | * Generate 64-bit timestamp. |
| 626 | */ |
| 627 | |
| 628 | static unsigned long long get_timestamp(void) |
| 629 | { |
| 630 | unsigned int __a,__d; |
| 631 | |
| 632 | asm volatile("mftbl %0" : "=r" (__a)); |
| 633 | asm volatile("mftbu %0" : "=r" (__d)); |
| 634 | return ((long long)__a) | (((long long)__d)<<32); |
| 635 | } |
| 636 | |
| 637 | /* |
| 638 | * api_pthreads.h: API mapping to pthreads environment. |
| 639 | * |
| 640 | * This program is free software; you can redistribute it and/or modify |
| 641 | * it under the terms of the GNU General Public License as published by |
| 642 | * the Free Software Foundation; either version 2 of the License, or |
| 643 | * (at your option) any later version. However, please note that much |
| 644 | * of the code in this file derives from the Linux kernel, and that such |
| 645 | * code may not be available except under GPLv2. |
| 646 | * |
| 647 | * This program is distributed in the hope that it will be useful, |
| 648 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 649 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 650 | * GNU General Public License for more details. |
| 651 | * |
| 652 | * You should have received a copy of the GNU General Public License |
| 653 | * along with this program; if not, write to the Free Software |
| 654 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 655 | * |
| 656 | * Copyright (c) 2006 Paul E. McKenney, IBM. |
| 657 | */ |
| 658 | |
| 659 | #include <stdio.h> |
| 660 | #include <stdlib.h> |
| 661 | #include <errno.h> |
| 662 | #include <limits.h> |
| 663 | #include <sys/types.h> |
| 664 | #define __USE_GNU |
| 665 | #include <pthread.h> |
| 666 | #include <sched.h> |
| 667 | #include <sys/param.h> |
| 668 | /* #include "atomic.h" */ |
| 669 | |
| 670 | /* |
| 671 | * Compiler magic. |
| 672 | */ |
| 673 | #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) |
| 674 | #define container_of(ptr, type, member) ({ \ |
| 675 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ |
| 676 | (type *)( (char *)__mptr - offsetof(type,member) );}) |
| 677 | #define barrier() __asm__ __volatile__("": : :"memory") |
| 678 | |
| 679 | /* |
| 680 | * Default machine parameters. |
| 681 | */ |
| 682 | |
| 683 | #ifndef CACHE_LINE_SIZE |
| 684 | #define CACHE_LINE_SIZE 128 |
| 685 | #endif /* #ifndef CACHE_LINE_SIZE */ |
| 686 | |
| 687 | /* |
| 688 | * Exclusive locking primitives. |
| 689 | */ |
| 690 | |
| 691 | typedef pthread_mutex_t spinlock_t; |
| 692 | |
| 693 | #define DEFINE_SPINLOCK(lock) spinlock_t lock = PTHREAD_MUTEX_INITIALIZER; |
| 694 | #define __SPIN_LOCK_UNLOCKED(lockp) PTHREAD_MUTEX_INITIALIZER |
| 695 | |
| 696 | static void spin_lock_init(spinlock_t *sp) |
| 697 | { |
| 698 | if (pthread_mutex_init(sp, NULL) != 0) { |
| 699 | perror("spin_lock_init:pthread_mutex_init"); |
| 700 | exit(-1); |
| 701 | } |
| 702 | } |
| 703 | |
| 704 | static void spin_lock(spinlock_t *sp) |
| 705 | { |
| 706 | if (pthread_mutex_lock(sp) != 0) { |
| 707 | perror("spin_lock:pthread_mutex_lock"); |
| 708 | exit(-1); |
| 709 | } |
| 710 | } |
| 711 | |
| 712 | static int spin_trylock(spinlock_t *sp) |
| 713 | { |
| 714 | int retval; |
| 715 | |
| 716 | if ((retval = pthread_mutex_trylock(sp)) == 0) |
| 717 | return 1; |
| 718 | if (retval == EBUSY) |
| 719 | return 0; |
| 720 | perror("spin_trylock:pthread_mutex_trylock"); |
| 721 | exit(-1); |
| 722 | } |
| 723 | |
| 724 | static void spin_unlock(spinlock_t *sp) |
| 725 | { |
| 726 | if (pthread_mutex_unlock(sp) != 0) { |
| 727 | perror("spin_unlock:pthread_mutex_unlock"); |
| 728 | exit(-1); |
| 729 | } |
| 730 | } |
| 731 | |
| 732 | #define spin_lock_irqsave(l, f) do { f = 1; spin_lock(l); } while (0) |
| 733 | #define spin_unlock_irqrestore(l, f) do { f = 0; spin_unlock(l); } while (0) |
| 734 | |
| 735 | #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) |
| 736 | #define unlikely(x) x |
| 737 | #define likely(x) x |
| 738 | #define prefetch(x) x |
| 739 | |
| 740 | /* |
| 741 | * Thread creation/destruction primitives. |
| 742 | */ |
| 743 | |
| 744 | typedef pthread_t thread_id_t; |
| 745 | |
| 746 | #define NR_THREADS 128 |
| 747 | |
| 748 | #define __THREAD_ID_MAP_EMPTY 0 |
| 749 | #define __THREAD_ID_MAP_WAITING 1 |
| 750 | thread_id_t __thread_id_map[NR_THREADS]; |
| 751 | spinlock_t __thread_id_map_mutex; |
| 752 | |
| 753 | #define for_each_thread(t) \ |
| 754 | for (t = 0; t < NR_THREADS; t++) |
| 755 | |
| 756 | #define for_each_running_thread(t) \ |
| 757 | for (t = 0; t < NR_THREADS; t++) \ |
| 758 | if ((__thread_id_map[t] != __THREAD_ID_MAP_EMPTY) && \ |
| 759 | (__thread_id_map[t] != __THREAD_ID_MAP_WAITING)) |
| 760 | |
| 761 | #define for_each_tid(t, tid) \ |
| 762 | for (t = 0; t < NR_THREADS; t++) \ |
| 763 | if ((((tid) = __thread_id_map[t]) != __THREAD_ID_MAP_EMPTY) && \ |
| 764 | ((tid) != __THREAD_ID_MAP_WAITING)) |
| 765 | |
| 766 | pthread_key_t thread_id_key; |
| 767 | |
| 768 | static int __smp_thread_id(void) |
| 769 | { |
| 770 | int i; |
| 771 | thread_id_t tid = pthread_self(); |
| 772 | |
| 773 | for (i = 0; i < NR_THREADS; i++) { |
| 774 | if (__thread_id_map[i] == tid) { |
| 775 | long v = i + 1; /* must be non-NULL. */ |
| 776 | |
| 777 | if (pthread_setspecific(thread_id_key, (void *)v) != 0) { |
| 778 | perror("pthread_setspecific"); |
| 779 | exit(-1); |
| 780 | } |
| 781 | return i; |
| 782 | } |
| 783 | } |
| 784 | spin_lock(&__thread_id_map_mutex); |
| 785 | for (i = 0; i < NR_THREADS; i++) { |
| 786 | if (__thread_id_map[i] == tid) |
| 787 | spin_unlock(&__thread_id_map_mutex); |
| 788 | return i; |
| 789 | } |
| 790 | spin_unlock(&__thread_id_map_mutex); |
| 791 | fprintf(stderr, "smp_thread_id: Rogue thread, id: %d(%#x)\n", tid, tid); |
| 792 | exit(-1); |
| 793 | } |
| 794 | |
| 795 | static int smp_thread_id(void) |
| 796 | { |
| 797 | void *id; |
| 798 | |
| 799 | id = pthread_getspecific(thread_id_key); |
| 800 | if (id == NULL) |
| 801 | return __smp_thread_id(); |
| 802 | return (long)(id - 1); |
| 803 | } |
| 804 | |
| 805 | static thread_id_t create_thread(void *(*func)(void *), void *arg) |
| 806 | { |
| 807 | thread_id_t tid; |
| 808 | int i; |
| 809 | |
| 810 | spin_lock(&__thread_id_map_mutex); |
| 811 | for (i = 0; i < NR_THREADS; i++) { |
| 812 | if (__thread_id_map[i] == __THREAD_ID_MAP_EMPTY) |
| 813 | break; |
| 814 | } |
| 815 | if (i >= NR_THREADS) { |
| 816 | spin_unlock(&__thread_id_map_mutex); |
| 817 | fprintf(stderr, "Thread limit of %d exceeded!\n", NR_THREADS); |
| 818 | exit(-1); |
| 819 | } |
| 820 | __thread_id_map[i] = __THREAD_ID_MAP_WAITING; |
| 821 | spin_unlock(&__thread_id_map_mutex); |
| 822 | if (pthread_create(&tid, NULL, func, arg) != 0) { |
| 823 | perror("create_thread:pthread_create"); |
| 824 | exit(-1); |
| 825 | } |
| 826 | __thread_id_map[i] = tid; |
| 827 | return tid; |
| 828 | } |
| 829 | |
| 830 | static void *wait_thread(thread_id_t tid) |
| 831 | { |
| 832 | int i; |
| 833 | void *vp; |
| 834 | |
| 835 | for (i = 0; i < NR_THREADS; i++) { |
| 836 | if (__thread_id_map[i] == tid) |
| 837 | break; |
| 838 | } |
| 839 | if (i >= NR_THREADS){ |
| 840 | fprintf(stderr, "wait_thread: bad tid = %d(%#x)\n", tid, tid); |
| 841 | exit(-1); |
| 842 | } |
| 843 | if (pthread_join(tid, &vp) != 0) { |
| 844 | perror("wait_thread:pthread_join"); |
| 845 | exit(-1); |
| 846 | } |
| 847 | __thread_id_map[i] = __THREAD_ID_MAP_EMPTY; |
| 848 | return vp; |
| 849 | } |
| 850 | |
| 851 | static void wait_all_threads(void) |
| 852 | { |
| 853 | int i; |
| 854 | thread_id_t tid; |
| 855 | |
| 856 | for (i = 1; i < NR_THREADS; i++) { |
| 857 | tid = __thread_id_map[i]; |
| 858 | if (tid != __THREAD_ID_MAP_EMPTY && |
| 859 | tid != __THREAD_ID_MAP_WAITING) |
| 860 | (void)wait_thread(tid); |
| 861 | } |
| 862 | } |
| 863 | |
| 864 | static void run_on(int cpu) |
| 865 | { |
| 866 | cpu_set_t mask; |
| 867 | |
| 868 | CPU_ZERO(&mask); |
| 869 | CPU_SET(cpu, &mask); |
| 870 | sched_setaffinity(0, sizeof(mask), &mask); |
| 871 | } |
| 872 | |
| 873 | /* |
| 874 | * timekeeping -- very crude -- should use MONOTONIC... |
| 875 | */ |
| 876 | |
| 877 | long long get_microseconds(void) |
| 878 | { |
| 879 | struct timeval tv; |
| 880 | |
| 881 | if (gettimeofday(&tv, NULL) != 0) |
| 882 | abort(); |
| 883 | return ((long long)tv.tv_sec) * 1000000LL + (long long)tv.tv_usec; |
| 884 | } |
| 885 | |
| 886 | /* |
| 887 | * Per-thread variables. |
| 888 | */ |
| 889 | |
| 890 | #define DEFINE_PER_THREAD(type, name) \ |
| 891 | struct { \ |
| 892 | __typeof__(type) v \ |
| 893 | __attribute__((__aligned__(CACHE_LINE_SIZE))); \ |
| 894 | } __per_thread_##name[NR_THREADS]; |
| 895 | #define DECLARE_PER_THREAD(type, name) extern DEFINE_PER_THREAD(type, name) |
| 896 | |
| 897 | #define per_thread(name, thread) __per_thread_##name[thread].v |
| 898 | #define __get_thread_var(name) per_thread(name, smp_thread_id()) |
| 899 | |
| 900 | #define init_per_thread(name, v) \ |
| 901 | do { \ |
| 902 | int __i_p_t_i; \ |
| 903 | for (__i_p_t_i = 0; __i_p_t_i < NR_THREADS; __i_p_t_i++) \ |
| 904 | per_thread(name, __i_p_t_i) = v; \ |
| 905 | } while (0) |
| 906 | |
| 907 | /* |
| 908 | * CPU traversal primitives. |
| 909 | */ |
| 910 | |
| 911 | #ifndef NR_CPUS |
| 912 | #define NR_CPUS 16 |
| 913 | #endif /* #ifndef NR_CPUS */ |
| 914 | |
| 915 | #define for_each_possible_cpu(cpu) \ |
| 916 | for (cpu = 0; cpu < NR_CPUS; cpu++) |
| 917 | #define for_each_online_cpu(cpu) \ |
| 918 | for (cpu = 0; cpu < NR_CPUS; cpu++) |
| 919 | |
| 920 | /* |
| 921 | * Per-CPU variables. |
| 922 | */ |
| 923 | |
| 924 | #define DEFINE_PER_CPU(type, name) \ |
| 925 | struct { \ |
| 926 | __typeof__(type) v \ |
| 927 | __attribute__((__aligned__(CACHE_LINE_SIZE))); \ |
| 928 | } __per_cpu_##name[NR_CPUS] |
| 929 | #define DECLARE_PER_CPU(type, name) extern DEFINE_PER_CPU(type, name) |
| 930 | |
| 931 | DEFINE_PER_THREAD(int, smp_processor_id); |
| 932 | |
| 933 | static int smp_processor_id(void) |
| 934 | { |
| 935 | return __get_thread_var(smp_processor_id); |
| 936 | } |
| 937 | |
| 938 | static void set_smp_processor_id(int cpu) |
| 939 | { |
| 940 | __get_thread_var(smp_processor_id) = cpu; |
| 941 | } |
| 942 | |
| 943 | #define per_cpu(name, thread) __per_cpu_##name[thread].v |
| 944 | #define __get_cpu_var(name) per_cpu(name, smp_processor_id()) |
| 945 | |
| 946 | #define init_per_cpu(name, v) \ |
| 947 | do { \ |
| 948 | int __i_p_c_i; \ |
| 949 | for (__i_p_c_i = 0; __i_p_c_i < NR_CPUS; __i_p_c_i++) \ |
| 950 | per_cpu(name, __i_p_c_i) = v; \ |
| 951 | } while (0) |
| 952 | |
| 953 | /* |
| 954 | * CPU state checking (crowbarred). |
| 955 | */ |
| 956 | |
| 957 | #define idle_cpu(cpu) 0 |
| 958 | #define in_softirq() 1 |
| 959 | #define hardirq_count() 0 |
| 960 | #define PREEMPT_SHIFT 0 |
| 961 | #define SOFTIRQ_SHIFT (PREEMPT_SHIFT + PREEMPT_BITS) |
| 962 | #define HARDIRQ_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS) |
| 963 | #define PREEMPT_BITS 8 |
| 964 | #define SOFTIRQ_BITS 8 |
| 965 | |
| 966 | /* |
| 967 | * CPU hotplug. |
| 968 | */ |
| 969 | |
| 970 | struct notifier_block { |
| 971 | int (*notifier_call)(struct notifier_block *, unsigned long, void *); |
| 972 | struct notifier_block *next; |
| 973 | int priority; |
| 974 | }; |
| 975 | |
| 976 | #define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */ |
| 977 | #define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */ |
| 978 | #define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */ |
| 979 | #define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */ |
| 980 | #define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */ |
| 981 | #define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */ |
| 982 | #define CPU_DYING 0x0008 /* CPU (unsigned)v not running any task, |
| 983 | * not handling interrupts, soon dead */ |
| 984 | #define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug |
| 985 | * lock is dropped */ |
| 986 | |
| 987 | /* Used for CPU hotplug events occuring while tasks are frozen due to a suspend |
| 988 | * operation in progress |
| 989 | */ |
| 990 | #define CPU_TASKS_FROZEN 0x0010 |
| 991 | |
| 992 | #define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN) |
| 993 | #define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN) |
| 994 | #define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN) |
| 995 | #define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN) |
| 996 | #define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN) |
| 997 | #define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN) |
| 998 | #define CPU_DYING_FROZEN (CPU_DYING | CPU_TASKS_FROZEN) |
| 999 | |
| 1000 | /* Hibernation and suspend events */ |
| 1001 | #define PM_HIBERNATION_PREPARE 0x0001 /* Going to hibernate */ |
| 1002 | #define PM_POST_HIBERNATION 0x0002 /* Hibernation finished */ |
| 1003 | #define PM_SUSPEND_PREPARE 0x0003 /* Going to suspend the system */ |
| 1004 | #define PM_POST_SUSPEND 0x0004 /* Suspend finished */ |
| 1005 | #define PM_RESTORE_PREPARE 0x0005 /* Going to restore a saved image */ |
| 1006 | #define PM_POST_RESTORE 0x0006 /* Restore failed */ |
| 1007 | |
| 1008 | #define NOTIFY_DONE 0x0000 /* Don't care */ |
| 1009 | #define NOTIFY_OK 0x0001 /* Suits me */ |
| 1010 | #define NOTIFY_STOP_MASK 0x8000 /* Don't call further */ |
| 1011 | #define NOTIFY_BAD (NOTIFY_STOP_MASK|0x0002) |
| 1012 | /* Bad/Veto action */ |
| 1013 | /* |
| 1014 | * Clean way to return from the notifier and stop further calls. |
| 1015 | */ |
| 1016 | #define NOTIFY_STOP (NOTIFY_OK|NOTIFY_STOP_MASK) |
| 1017 | |
| 1018 | /* |
| 1019 | * Bug checks. |
| 1020 | */ |
| 1021 | |
| 1022 | #define BUG_ON(c) do { if (!(c)) abort(); } while (0) |
| 1023 | |
| 1024 | /* |
| 1025 | * Initialization -- Must be called before calling any primitives. |
| 1026 | */ |
| 1027 | |
| 1028 | static void smp_init(void) |
| 1029 | { |
| 1030 | int i; |
| 1031 | |
| 1032 | spin_lock_init(&__thread_id_map_mutex); |
| 1033 | __thread_id_map[0] = pthread_self(); |
| 1034 | for (i = 1; i < NR_THREADS; i++) |
| 1035 | __thread_id_map[i] = __THREAD_ID_MAP_EMPTY; |
| 1036 | init_per_thread(smp_processor_id, 0); |
| 1037 | if (pthread_key_create(&thread_id_key, NULL) != 0) { |
| 1038 | perror("pthread_key_create"); |
| 1039 | exit(-1); |
| 1040 | } |
| 1041 | } |
| 1042 | |
| 1043 | /* Taken from the Linux kernel source tree, so GPLv2-only!!! */ |
| 1044 | |
| 1045 | #ifndef _LINUX_LIST_H |
| 1046 | #define _LINUX_LIST_H |
| 1047 | |
| 1048 | #define LIST_POISON1 ((void *) 0x00100100) |
| 1049 | #define LIST_POISON2 ((void *) 0x00200200) |
| 1050 | |
| 1051 | #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) |
| 1052 | #define container_of(ptr, type, member) ({ \ |
| 1053 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ |
| 1054 | (type *)( (char *)__mptr - offsetof(type,member) );}) |
| 1055 | |
| 1056 | /* |
| 1057 | * Simple doubly linked list implementation. |
| 1058 | * |
| 1059 | * Some of the internal functions ("__xxx") are useful when |
| 1060 | * manipulating whole lists rather than single entries, as |
| 1061 | * sometimes we already know the next/prev entries and we can |
| 1062 | * generate better code by using them directly rather than |
| 1063 | * using the generic single-entry routines. |
| 1064 | */ |
| 1065 | |
| 1066 | struct list_head { |
| 1067 | struct list_head *next, *prev; |
| 1068 | }; |
| 1069 | |
| 1070 | #define LIST_HEAD_INIT(name) { &(name), &(name) } |
| 1071 | |
| 1072 | #define LIST_HEAD(name) \ |
| 1073 | struct list_head name = LIST_HEAD_INIT(name) |
| 1074 | |
| 1075 | static inline void INIT_LIST_HEAD(struct list_head *list) |
| 1076 | { |
| 1077 | list->next = list; |
| 1078 | list->prev = list; |
| 1079 | } |
| 1080 | |
| 1081 | /* |
| 1082 | * Insert a new entry between two known consecutive entries. |
| 1083 | * |
| 1084 | * This is only for internal list manipulation where we know |
| 1085 | * the prev/next entries already! |
| 1086 | */ |
| 1087 | #ifndef CONFIG_DEBUG_LIST |
| 1088 | static inline void __list_add(struct list_head *new, |
| 1089 | struct list_head *prev, |
| 1090 | struct list_head *next) |
| 1091 | { |
| 1092 | next->prev = new; |
| 1093 | new->next = next; |
| 1094 | new->prev = prev; |
| 1095 | prev->next = new; |
| 1096 | } |
| 1097 | #else |
| 1098 | extern void __list_add(struct list_head *new, |
| 1099 | struct list_head *prev, |
| 1100 | struct list_head *next); |
| 1101 | #endif |
| 1102 | |
| 1103 | /** |
| 1104 | * list_add - add a new entry |
| 1105 | * @new: new entry to be added |
| 1106 | * @head: list head to add it after |
| 1107 | * |
| 1108 | * Insert a new entry after the specified head. |
| 1109 | * This is good for implementing stacks. |
| 1110 | */ |
| 1111 | static inline void list_add(struct list_head *new, struct list_head *head) |
| 1112 | { |
| 1113 | __list_add(new, head, head->next); |
| 1114 | } |
| 1115 | |
| 1116 | |
| 1117 | /** |
| 1118 | * list_add_tail - add a new entry |
| 1119 | * @new: new entry to be added |
| 1120 | * @head: list head to add it before |
| 1121 | * |
| 1122 | * Insert a new entry before the specified head. |
| 1123 | * This is useful for implementing queues. |
| 1124 | */ |
| 1125 | static inline void list_add_tail(struct list_head *new, struct list_head *head) |
| 1126 | { |
| 1127 | __list_add(new, head->prev, head); |
| 1128 | } |
| 1129 | |
| 1130 | /* |
| 1131 | * Delete a list entry by making the prev/next entries |
| 1132 | * point to each other. |
| 1133 | * |
| 1134 | * This is only for internal list manipulation where we know |
| 1135 | * the prev/next entries already! |
| 1136 | */ |
| 1137 | static inline void __list_del(struct list_head * prev, struct list_head * next) |
| 1138 | { |
| 1139 | next->prev = prev; |
| 1140 | prev->next = next; |
| 1141 | } |
| 1142 | |
| 1143 | /** |
| 1144 | * list_del - deletes entry from list. |
| 1145 | * @entry: the element to delete from the list. |
| 1146 | * Note: list_empty() on entry does not return true after this, the entry is |
| 1147 | * in an undefined state. |
| 1148 | */ |
| 1149 | #ifndef CONFIG_DEBUG_LIST |
| 1150 | static inline void list_del(struct list_head *entry) |
| 1151 | { |
| 1152 | __list_del(entry->prev, entry->next); |
| 1153 | entry->next = LIST_POISON1; |
| 1154 | entry->prev = LIST_POISON2; |
| 1155 | } |
| 1156 | #else |
| 1157 | extern void list_del(struct list_head *entry); |
| 1158 | #endif |
| 1159 | |
| 1160 | /** |
| 1161 | * list_replace - replace old entry by new one |
| 1162 | * @old : the element to be replaced |
| 1163 | * @new : the new element to insert |
| 1164 | * |
| 1165 | * If @old was empty, it will be overwritten. |
| 1166 | */ |
| 1167 | static inline void list_replace(struct list_head *old, |
| 1168 | struct list_head *new) |
| 1169 | { |
| 1170 | new->next = old->next; |
| 1171 | new->next->prev = new; |
| 1172 | new->prev = old->prev; |
| 1173 | new->prev->next = new; |
| 1174 | } |
| 1175 | |
| 1176 | static inline void list_replace_init(struct list_head *old, |
| 1177 | struct list_head *new) |
| 1178 | { |
| 1179 | list_replace(old, new); |
| 1180 | INIT_LIST_HEAD(old); |
| 1181 | } |
| 1182 | |
| 1183 | /** |
| 1184 | * list_del_init - deletes entry from list and reinitialize it. |
| 1185 | * @entry: the element to delete from the list. |
| 1186 | */ |
| 1187 | static inline void list_del_init(struct list_head *entry) |
| 1188 | { |
| 1189 | __list_del(entry->prev, entry->next); |
| 1190 | INIT_LIST_HEAD(entry); |
| 1191 | } |
| 1192 | |
| 1193 | /** |
| 1194 | * list_move - delete from one list and add as another's head |
| 1195 | * @list: the entry to move |
| 1196 | * @head: the head that will precede our entry |
| 1197 | */ |
| 1198 | static inline void list_move(struct list_head *list, struct list_head *head) |
| 1199 | { |
| 1200 | __list_del(list->prev, list->next); |
| 1201 | list_add(list, head); |
| 1202 | } |
| 1203 | |
| 1204 | /** |
| 1205 | * list_move_tail - delete from one list and add as another's tail |
| 1206 | * @list: the entry to move |
| 1207 | * @head: the head that will follow our entry |
| 1208 | */ |
| 1209 | static inline void list_move_tail(struct list_head *list, |
| 1210 | struct list_head *head) |
| 1211 | { |
| 1212 | __list_del(list->prev, list->next); |
| 1213 | list_add_tail(list, head); |
| 1214 | } |
| 1215 | |
| 1216 | /** |
| 1217 | * list_is_last - tests whether @list is the last entry in list @head |
| 1218 | * @list: the entry to test |
| 1219 | * @head: the head of the list |
| 1220 | */ |
| 1221 | static inline int list_is_last(const struct list_head *list, |
| 1222 | const struct list_head *head) |
| 1223 | { |
| 1224 | return list->next == head; |
| 1225 | } |
| 1226 | |
| 1227 | /** |
| 1228 | * list_empty - tests whether a list is empty |
| 1229 | * @head: the list to test. |
| 1230 | */ |
| 1231 | static inline int list_empty(const struct list_head *head) |
| 1232 | { |
| 1233 | return head->next == head; |
| 1234 | } |
| 1235 | |
| 1236 | /** |
| 1237 | * list_empty_careful - tests whether a list is empty and not being modified |
| 1238 | * @head: the list to test |
| 1239 | * |
| 1240 | * Description: |
| 1241 | * tests whether a list is empty _and_ checks that no other CPU might be |
| 1242 | * in the process of modifying either member (next or prev) |
| 1243 | * |
| 1244 | * NOTE: using list_empty_careful() without synchronization |
| 1245 | * can only be safe if the only activity that can happen |
| 1246 | * to the list entry is list_del_init(). Eg. it cannot be used |
| 1247 | * if another CPU could re-list_add() it. |
| 1248 | */ |
| 1249 | static inline int list_empty_careful(const struct list_head *head) |
| 1250 | { |
| 1251 | struct list_head *next = head->next; |
| 1252 | return (next == head) && (next == head->prev); |
| 1253 | } |
| 1254 | |
| 1255 | /** |
| 1256 | * list_is_singular - tests whether a list has just one entry. |
| 1257 | * @head: the list to test. |
| 1258 | */ |
| 1259 | static inline int list_is_singular(const struct list_head *head) |
| 1260 | { |
| 1261 | return !list_empty(head) && (head->next == head->prev); |
| 1262 | } |
| 1263 | |
| 1264 | static inline void __list_cut_position(struct list_head *list, |
| 1265 | struct list_head *head, struct list_head *entry) |
| 1266 | { |
| 1267 | struct list_head *new_first = entry->next; |
| 1268 | list->next = head->next; |
| 1269 | list->next->prev = list; |
| 1270 | list->prev = entry; |
| 1271 | entry->next = list; |
| 1272 | head->next = new_first; |
| 1273 | new_first->prev = head; |
| 1274 | } |
| 1275 | |
| 1276 | /** |
| 1277 | * list_cut_position - cut a list into two |
| 1278 | * @list: a new list to add all removed entries |
| 1279 | * @head: a list with entries |
| 1280 | * @entry: an entry within head, could be the head itself |
| 1281 | * and if so we won't cut the list |
| 1282 | * |
| 1283 | * This helper moves the initial part of @head, up to and |
| 1284 | * including @entry, from @head to @list. You should |
| 1285 | * pass on @entry an element you know is on @head. @list |
| 1286 | * should be an empty list or a list you do not care about |
| 1287 | * losing its data. |
| 1288 | * |
| 1289 | */ |
| 1290 | static inline void list_cut_position(struct list_head *list, |
| 1291 | struct list_head *head, struct list_head *entry) |
| 1292 | { |
| 1293 | if (list_empty(head)) |
| 1294 | return; |
| 1295 | if (list_is_singular(head) && |
| 1296 | (head->next != entry && head != entry)) |
| 1297 | return; |
| 1298 | if (entry == head) |
| 1299 | INIT_LIST_HEAD(list); |
| 1300 | else |
| 1301 | __list_cut_position(list, head, entry); |
| 1302 | } |
| 1303 | |
| 1304 | static inline void __list_splice(const struct list_head *list, |
| 1305 | struct list_head *prev, |
| 1306 | struct list_head *next) |
| 1307 | { |
| 1308 | struct list_head *first = list->next; |
| 1309 | struct list_head *last = list->prev; |
| 1310 | |
| 1311 | first->prev = prev; |
| 1312 | prev->next = first; |
| 1313 | |
| 1314 | last->next = next; |
| 1315 | next->prev = last; |
| 1316 | } |
| 1317 | |
| 1318 | /** |
| 1319 | * list_splice - join two lists, this is designed for stacks |
| 1320 | * @list: the new list to add. |
| 1321 | * @head: the place to add it in the first list. |
| 1322 | */ |
| 1323 | static inline void list_splice(const struct list_head *list, |
| 1324 | struct list_head *head) |
| 1325 | { |
| 1326 | if (!list_empty(list)) |
| 1327 | __list_splice(list, head, head->next); |
| 1328 | } |
| 1329 | |
| 1330 | /** |
| 1331 | * list_splice_tail - join two lists, each list being a queue |
| 1332 | * @list: the new list to add. |
| 1333 | * @head: the place to add it in the first list. |
| 1334 | */ |
| 1335 | static inline void list_splice_tail(struct list_head *list, |
| 1336 | struct list_head *head) |
| 1337 | { |
| 1338 | if (!list_empty(list)) |
| 1339 | __list_splice(list, head->prev, head); |
| 1340 | } |
| 1341 | |
| 1342 | /** |
| 1343 | * list_splice_init - join two lists and reinitialise the emptied list. |
| 1344 | * @list: the new list to add. |
| 1345 | * @head: the place to add it in the first list. |
| 1346 | * |
| 1347 | * The list at @list is reinitialised |
| 1348 | */ |
| 1349 | static inline void list_splice_init(struct list_head *list, |
| 1350 | struct list_head *head) |
| 1351 | { |
| 1352 | if (!list_empty(list)) { |
| 1353 | __list_splice(list, head, head->next); |
| 1354 | INIT_LIST_HEAD(list); |
| 1355 | } |
| 1356 | } |
| 1357 | |
| 1358 | /** |
| 1359 | * list_splice_tail_init - join two lists and reinitialise the emptied list |
| 1360 | * @list: the new list to add. |
| 1361 | * @head: the place to add it in the first list. |
| 1362 | * |
| 1363 | * Each of the lists is a queue. |
| 1364 | * The list at @list is reinitialised |
| 1365 | */ |
| 1366 | static inline void list_splice_tail_init(struct list_head *list, |
| 1367 | struct list_head *head) |
| 1368 | { |
| 1369 | if (!list_empty(list)) { |
| 1370 | __list_splice(list, head->prev, head); |
| 1371 | INIT_LIST_HEAD(list); |
| 1372 | } |
| 1373 | } |
| 1374 | |
| 1375 | /** |
| 1376 | * list_entry - get the struct for this entry |
| 1377 | * @ptr: the &struct list_head pointer. |
| 1378 | * @type: the type of the struct this is embedded in. |
| 1379 | * @member: the name of the list_struct within the struct. |
| 1380 | */ |
| 1381 | #define list_entry(ptr, type, member) \ |
| 1382 | container_of(ptr, type, member) |
| 1383 | |
| 1384 | /** |
| 1385 | * list_first_entry - get the first element from a list |
| 1386 | * @ptr: the list head to take the element from. |
| 1387 | * @type: the type of the struct this is embedded in. |
| 1388 | * @member: the name of the list_struct within the struct. |
| 1389 | * |
| 1390 | * Note, that list is expected to be not empty. |
| 1391 | */ |
| 1392 | #define list_first_entry(ptr, type, member) \ |
| 1393 | list_entry((ptr)->next, type, member) |
| 1394 | |
| 1395 | /** |
| 1396 | * list_for_each - iterate over a list |
| 1397 | * @pos: the &struct list_head to use as a loop cursor. |
| 1398 | * @head: the head for your list. |
| 1399 | */ |
| 1400 | #define list_for_each(pos, head) \ |
| 1401 | for (pos = (head)->next; prefetch(pos->next), pos != (head); \ |
| 1402 | pos = pos->next) |
| 1403 | |
| 1404 | /** |
| 1405 | * __list_for_each - iterate over a list |
| 1406 | * @pos: the &struct list_head to use as a loop cursor. |
| 1407 | * @head: the head for your list. |
| 1408 | * |
| 1409 | * This variant differs from list_for_each() in that it's the |
| 1410 | * simplest possible list iteration code, no prefetching is done. |
| 1411 | * Use this for code that knows the list to be very short (empty |
| 1412 | * or 1 entry) most of the time. |
| 1413 | */ |
| 1414 | #define __list_for_each(pos, head) \ |
| 1415 | for (pos = (head)->next; pos != (head); pos = pos->next) |
| 1416 | |
| 1417 | /** |
| 1418 | * list_for_each_prev - iterate over a list backwards |
| 1419 | * @pos: the &struct list_head to use as a loop cursor. |
| 1420 | * @head: the head for your list. |
| 1421 | */ |
| 1422 | #define list_for_each_prev(pos, head) \ |
| 1423 | for (pos = (head)->prev; prefetch(pos->prev), pos != (head); \ |
| 1424 | pos = pos->prev) |
| 1425 | |
| 1426 | /** |
| 1427 | * list_for_each_safe - iterate over a list safe against removal of list entry |
| 1428 | * @pos: the &struct list_head to use as a loop cursor. |
| 1429 | * @n: another &struct list_head to use as temporary storage |
| 1430 | * @head: the head for your list. |
| 1431 | */ |
| 1432 | #define list_for_each_safe(pos, n, head) \ |
| 1433 | for (pos = (head)->next, n = pos->next; pos != (head); \ |
| 1434 | pos = n, n = pos->next) |
| 1435 | |
| 1436 | /** |
| 1437 | * list_for_each_prev_safe - iterate over a list backwards safe against removal of list entry |
| 1438 | * @pos: the &struct list_head to use as a loop cursor. |
| 1439 | * @n: another &struct list_head to use as temporary storage |
| 1440 | * @head: the head for your list. |
| 1441 | */ |
| 1442 | #define list_for_each_prev_safe(pos, n, head) \ |
| 1443 | for (pos = (head)->prev, n = pos->prev; \ |
| 1444 | prefetch(pos->prev), pos != (head); \ |
| 1445 | pos = n, n = pos->prev) |
| 1446 | |
| 1447 | /** |
| 1448 | * list_for_each_entry - iterate over list of given type |
| 1449 | * @pos: the type * to use as a loop cursor. |
| 1450 | * @head: the head for your list. |
| 1451 | * @member: the name of the list_struct within the struct. |
| 1452 | */ |
| 1453 | #define list_for_each_entry(pos, head, member) \ |
| 1454 | for (pos = list_entry((head)->next, typeof(*pos), member); \ |
| 1455 | prefetch(pos->member.next), &pos->member != (head); \ |
| 1456 | pos = list_entry(pos->member.next, typeof(*pos), member)) |
| 1457 | |
| 1458 | /** |
| 1459 | * list_for_each_entry_reverse - iterate backwards over list of given type. |
| 1460 | * @pos: the type * to use as a loop cursor. |
| 1461 | * @head: the head for your list. |
| 1462 | * @member: the name of the list_struct within the struct. |
| 1463 | */ |
| 1464 | #define list_for_each_entry_reverse(pos, head, member) \ |
| 1465 | for (pos = list_entry((head)->prev, typeof(*pos), member); \ |
| 1466 | prefetch(pos->member.prev), &pos->member != (head); \ |
| 1467 | pos = list_entry(pos->member.prev, typeof(*pos), member)) |
| 1468 | |
| 1469 | /** |
| 1470 | * list_prepare_entry - prepare a pos entry for use in list_for_each_entry_continue() |
| 1471 | * @pos: the type * to use as a start point |
| 1472 | * @head: the head of the list |
| 1473 | * @member: the name of the list_struct within the struct. |
| 1474 | * |
| 1475 | * Prepares a pos entry for use as a start point in list_for_each_entry_continue(). |
| 1476 | */ |
| 1477 | #define list_prepare_entry(pos, head, member) \ |
| 1478 | ((pos) ? : list_entry(head, typeof(*pos), member)) |
| 1479 | |
| 1480 | /** |
| 1481 | * list_for_each_entry_continue - continue iteration over list of given type |
| 1482 | * @pos: the type * to use as a loop cursor. |
| 1483 | * @head: the head for your list. |
| 1484 | * @member: the name of the list_struct within the struct. |
| 1485 | * |
| 1486 | * Continue to iterate over list of given type, continuing after |
| 1487 | * the current position. |
| 1488 | */ |
| 1489 | #define list_for_each_entry_continue(pos, head, member) \ |
| 1490 | for (pos = list_entry(pos->member.next, typeof(*pos), member); \ |
| 1491 | prefetch(pos->member.next), &pos->member != (head); \ |
| 1492 | pos = list_entry(pos->member.next, typeof(*pos), member)) |
| 1493 | |
| 1494 | /** |
| 1495 | * list_for_each_entry_continue_reverse - iterate backwards from the given point |
| 1496 | * @pos: the type * to use as a loop cursor. |
| 1497 | * @head: the head for your list. |
| 1498 | * @member: the name of the list_struct within the struct. |
| 1499 | * |
| 1500 | * Start to iterate over list of given type backwards, continuing after |
| 1501 | * the current position. |
| 1502 | */ |
| 1503 | #define list_for_each_entry_continue_reverse(pos, head, member) \ |
| 1504 | for (pos = list_entry(pos->member.prev, typeof(*pos), member); \ |
| 1505 | prefetch(pos->member.prev), &pos->member != (head); \ |
| 1506 | pos = list_entry(pos->member.prev, typeof(*pos), member)) |
| 1507 | |
| 1508 | /** |
| 1509 | * list_for_each_entry_from - iterate over list of given type from the current point |
| 1510 | * @pos: the type * to use as a loop cursor. |
| 1511 | * @head: the head for your list. |
| 1512 | * @member: the name of the list_struct within the struct. |
| 1513 | * |
| 1514 | * Iterate over list of given type, continuing from current position. |
| 1515 | */ |
| 1516 | #define list_for_each_entry_from(pos, head, member) \ |
| 1517 | for (; prefetch(pos->member.next), &pos->member != (head); \ |
| 1518 | pos = list_entry(pos->member.next, typeof(*pos), member)) |
| 1519 | |
| 1520 | /** |
| 1521 | * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry |
| 1522 | * @pos: the type * to use as a loop cursor. |
| 1523 | * @n: another type * to use as temporary storage |
| 1524 | * @head: the head for your list. |
| 1525 | * @member: the name of the list_struct within the struct. |
| 1526 | */ |
| 1527 | #define list_for_each_entry_safe(pos, n, head, member) \ |
| 1528 | for (pos = list_entry((head)->next, typeof(*pos), member), \ |
| 1529 | n = list_entry(pos->member.next, typeof(*pos), member); \ |
| 1530 | &pos->member != (head); \ |
| 1531 | pos = n, n = list_entry(n->member.next, typeof(*n), member)) |
| 1532 | |
| 1533 | /** |
| 1534 | * list_for_each_entry_safe_continue |
| 1535 | * @pos: the type * to use as a loop cursor. |
| 1536 | * @n: another type * to use as temporary storage |
| 1537 | * @head: the head for your list. |
| 1538 | * @member: the name of the list_struct within the struct. |
| 1539 | * |
| 1540 | * Iterate over list of given type, continuing after current point, |
| 1541 | * safe against removal of list entry. |
| 1542 | */ |
| 1543 | #define list_for_each_entry_safe_continue(pos, n, head, member) \ |
| 1544 | for (pos = list_entry(pos->member.next, typeof(*pos), member), \ |
| 1545 | n = list_entry(pos->member.next, typeof(*pos), member); \ |
| 1546 | &pos->member != (head); \ |
| 1547 | pos = n, n = list_entry(n->member.next, typeof(*n), member)) |
| 1548 | |
| 1549 | /** |
| 1550 | * list_for_each_entry_safe_from |
| 1551 | * @pos: the type * to use as a loop cursor. |
| 1552 | * @n: another type * to use as temporary storage |
| 1553 | * @head: the head for your list. |
| 1554 | * @member: the name of the list_struct within the struct. |
| 1555 | * |
| 1556 | * Iterate over list of given type from current point, safe against |
| 1557 | * removal of list entry. |
| 1558 | */ |
| 1559 | #define list_for_each_entry_safe_from(pos, n, head, member) \ |
| 1560 | for (n = list_entry(pos->member.next, typeof(*pos), member); \ |
| 1561 | &pos->member != (head); \ |
| 1562 | pos = n, n = list_entry(n->member.next, typeof(*n), member)) |
| 1563 | |
| 1564 | /** |
| 1565 | * list_for_each_entry_safe_reverse |
| 1566 | * @pos: the type * to use as a loop cursor. |
| 1567 | * @n: another type * to use as temporary storage |
| 1568 | * @head: the head for your list. |
| 1569 | * @member: the name of the list_struct within the struct. |
| 1570 | * |
| 1571 | * Iterate backwards over list of given type, safe against removal |
| 1572 | * of list entry. |
| 1573 | */ |
| 1574 | #define list_for_each_entry_safe_reverse(pos, n, head, member) \ |
| 1575 | for (pos = list_entry((head)->prev, typeof(*pos), member), \ |
| 1576 | n = list_entry(pos->member.prev, typeof(*pos), member); \ |
| 1577 | &pos->member != (head); \ |
| 1578 | pos = n, n = list_entry(n->member.prev, typeof(*n), member)) |
| 1579 | |
| 1580 | /* |
| 1581 | * Double linked lists with a single pointer list head. |
| 1582 | * Mostly useful for hash tables where the two pointer list head is |
| 1583 | * too wasteful. |
| 1584 | * You lose the ability to access the tail in O(1). |
| 1585 | */ |
| 1586 | |
| 1587 | struct hlist_head { |
| 1588 | struct hlist_node *first; |
| 1589 | }; |
| 1590 | |
| 1591 | struct hlist_node { |
| 1592 | struct hlist_node *next, **pprev; |
| 1593 | }; |
| 1594 | |
| 1595 | #define HLIST_HEAD_INIT { .first = NULL } |
| 1596 | #define HLIST_HEAD(name) struct hlist_head name = { .first = NULL } |
| 1597 | #define INIT_HLIST_HEAD(ptr) ((ptr)->first = NULL) |
| 1598 | static inline void INIT_HLIST_NODE(struct hlist_node *h) |
| 1599 | { |
| 1600 | h->next = NULL; |
| 1601 | h->pprev = NULL; |
| 1602 | } |
| 1603 | |
| 1604 | static inline int hlist_unhashed(const struct hlist_node *h) |
| 1605 | { |
| 1606 | return !h->pprev; |
| 1607 | } |
| 1608 | |
| 1609 | static inline int hlist_empty(const struct hlist_head *h) |
| 1610 | { |
| 1611 | return !h->first; |
| 1612 | } |
| 1613 | |
| 1614 | static inline void __hlist_del(struct hlist_node *n) |
| 1615 | { |
| 1616 | struct hlist_node *next = n->next; |
| 1617 | struct hlist_node **pprev = n->pprev; |
| 1618 | *pprev = next; |
| 1619 | if (next) |
| 1620 | next->pprev = pprev; |
| 1621 | } |
| 1622 | |
| 1623 | static inline void hlist_del(struct hlist_node *n) |
| 1624 | { |
| 1625 | __hlist_del(n); |
| 1626 | n->next = LIST_POISON1; |
| 1627 | n->pprev = LIST_POISON2; |
| 1628 | } |
| 1629 | |
| 1630 | static inline void hlist_del_init(struct hlist_node *n) |
| 1631 | { |
| 1632 | if (!hlist_unhashed(n)) { |
| 1633 | __hlist_del(n); |
| 1634 | INIT_HLIST_NODE(n); |
| 1635 | } |
| 1636 | } |
| 1637 | |
| 1638 | static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h) |
| 1639 | { |
| 1640 | struct hlist_node *first = h->first; |
| 1641 | n->next = first; |
| 1642 | if (first) |
| 1643 | first->pprev = &n->next; |
| 1644 | h->first = n; |
| 1645 | n->pprev = &h->first; |
| 1646 | } |
| 1647 | |
| 1648 | /* next must be != NULL */ |
| 1649 | static inline void hlist_add_before(struct hlist_node *n, |
| 1650 | struct hlist_node *next) |
| 1651 | { |
| 1652 | n->pprev = next->pprev; |
| 1653 | n->next = next; |
| 1654 | next->pprev = &n->next; |
| 1655 | *(n->pprev) = n; |
| 1656 | } |
| 1657 | |
| 1658 | static inline void hlist_add_after(struct hlist_node *n, |
| 1659 | struct hlist_node *next) |
| 1660 | { |
| 1661 | next->next = n->next; |
| 1662 | n->next = next; |
| 1663 | next->pprev = &n->next; |
| 1664 | |
| 1665 | if(next->next) |
| 1666 | next->next->pprev = &next->next; |
| 1667 | } |
| 1668 | |
| 1669 | /* |
| 1670 | * Move a list from one list head to another. Fixup the pprev |
| 1671 | * reference of the first entry if it exists. |
| 1672 | */ |
| 1673 | static inline void hlist_move_list(struct hlist_head *old, |
| 1674 | struct hlist_head *new) |
| 1675 | { |
| 1676 | new->first = old->first; |
| 1677 | if (new->first) |
| 1678 | new->first->pprev = &new->first; |
| 1679 | old->first = NULL; |
| 1680 | } |
| 1681 | |
| 1682 | #define hlist_entry(ptr, type, member) container_of(ptr,type,member) |
| 1683 | |
| 1684 | #define hlist_for_each(pos, head) \ |
| 1685 | for (pos = (head)->first; pos && ({ prefetch(pos->next); 1; }); \ |
| 1686 | pos = pos->next) |
| 1687 | |
| 1688 | #define hlist_for_each_safe(pos, n, head) \ |
| 1689 | for (pos = (head)->first; pos && ({ n = pos->next; 1; }); \ |
| 1690 | pos = n) |
| 1691 | |
| 1692 | /** |
| 1693 | * hlist_for_each_entry - iterate over list of given type |
| 1694 | * @tpos: the type * to use as a loop cursor. |
| 1695 | * @pos: the &struct hlist_node to use as a loop cursor. |
| 1696 | * @head: the head for your list. |
| 1697 | * @member: the name of the hlist_node within the struct. |
| 1698 | */ |
| 1699 | #define hlist_for_each_entry(tpos, pos, head, member) \ |
| 1700 | for (pos = (head)->first; \ |
| 1701 | pos && ({ prefetch(pos->next); 1;}) && \ |
| 1702 | ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \ |
| 1703 | pos = pos->next) |
| 1704 | |
| 1705 | /** |
| 1706 | * hlist_for_each_entry_continue - iterate over a hlist continuing after current point |
| 1707 | * @tpos: the type * to use as a loop cursor. |
| 1708 | * @pos: the &struct hlist_node to use as a loop cursor. |
| 1709 | * @member: the name of the hlist_node within the struct. |
| 1710 | */ |
| 1711 | #define hlist_for_each_entry_continue(tpos, pos, member) \ |
| 1712 | for (pos = (pos)->next; \ |
| 1713 | pos && ({ prefetch(pos->next); 1;}) && \ |
| 1714 | ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \ |
| 1715 | pos = pos->next) |
| 1716 | |
| 1717 | /** |
| 1718 | * hlist_for_each_entry_from - iterate over a hlist continuing from current point |
| 1719 | * @tpos: the type * to use as a loop cursor. |
| 1720 | * @pos: the &struct hlist_node to use as a loop cursor. |
| 1721 | * @member: the name of the hlist_node within the struct. |
| 1722 | */ |
| 1723 | #define hlist_for_each_entry_from(tpos, pos, member) \ |
| 1724 | for (; pos && ({ prefetch(pos->next); 1;}) && \ |
| 1725 | ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \ |
| 1726 | pos = pos->next) |
| 1727 | |
| 1728 | /** |
| 1729 | * hlist_for_each_entry_safe - iterate over list of given type safe against removal of list entry |
| 1730 | * @tpos: the type * to use as a loop cursor. |
| 1731 | * @pos: the &struct hlist_node to use as a loop cursor. |
| 1732 | * @n: another &struct hlist_node to use as temporary storage |
| 1733 | * @head: the head for your list. |
| 1734 | * @member: the name of the hlist_node within the struct. |
| 1735 | */ |
| 1736 | #define hlist_for_each_entry_safe(tpos, pos, n, head, member) \ |
| 1737 | for (pos = (head)->first; \ |
| 1738 | pos && ({ n = pos->next; 1; }) && \ |
| 1739 | ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \ |
| 1740 | pos = n) |
| 1741 | |
| 1742 | #endif |