1 /* Set flags signalling availability of kernel features based on given 2 kernel version number. 3 Copyright (C) 1999-2003, 2004, 2005 Free Software Foundation, Inc. 4 This file is part of the GNU C Library. 5 6 The GNU C Library is free software; you can redistribute it and/or 7 modify it under the terms of the GNU Lesser General Public 8 License as published by the Free Software Foundation; either 9 version 2.1 of the License, or (at your option) any later version. 10 11 The GNU C Library is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Lesser General Public License for more details. 15 16 You should have received a copy of the GNU Lesser General Public 17 License along with the GNU C Library; if not, see 18 <http://www.gnu.org/licenses/>. */ 19 20 /* This file must not contain any C code. At least it must be protected 21 to allow using the file also in assembler files. */ 22 23 #if defined __mips__ 24 # include <sgidefs.h> 25 #endif 26 27 #include <linux/version.h> 28 #define __LINUX_KERNEL_VERSION LINUX_VERSION_CODE 29 30 /* We assume for __LINUX_KERNEL_VERSION the same encoding used in 31 linux/version.h. I.e., the major, minor, and subminor all get a 32 byte with the major number being in the highest byte. This means 33 we can do numeric comparisons. 34 35 In the following we will define certain symbols depending on 36 whether the describes kernel feature is available in the kernel 37 version given by __LINUX_KERNEL_VERSION. We are not always exactly 38 recording the correct versions in which the features were 39 introduced. If somebody cares these values can afterwards be 40 corrected. Most of the numbers here are set corresponding to 41 2.2.0. */ 42 43 /* `getcwd' system call. */ 44 #if __LINUX_KERNEL_VERSION >= 131584 45 # define __ASSUME_GETCWD_SYSCALL 1 46 #endif 47 48 /* When was `poll' introduced? */ 49 #if __LINUX_KERNEL_VERSION >= 131584 50 # define __ASSUME_POLL_SYSCALL 1 51 #endif 52 53 /* Real-time signal became usable in 2.1.70. */ 54 #if __LINUX_KERNEL_VERSION >= 131398 55 # define __ASSUME_REALTIME_SIGNALS 1 56 #endif 57 58 /* When were the `pread'/`pwrite' syscalls introduced? */ 59 #if __LINUX_KERNEL_VERSION >= 131584 60 # define __ASSUME_PREAD_SYSCALL 1 61 # define __ASSUME_PWRITE_SYSCALL 1 62 #endif 63 64 /* When was `poll' introduced? */ 65 #if __LINUX_KERNEL_VERSION >= 131584 66 # define __ASSUME_POLL_SYSCALL 1 67 #endif 68 69 /* The `lchown' syscall was introduced in 2.1.80. */ 70 #if __LINUX_KERNEL_VERSION >= 131408 71 # define __ASSUME_LCHOWN_SYSCALL 1 72 #endif 73 74 /* When did the `setresuid' sysall became available? */ 75 #if __LINUX_KERNEL_VERSION >= 131584 && !defined __sparc__ 76 # define __ASSUME_SETRESUID_SYSCALL 1 77 #endif 78 79 /* The SIOCGIFNAME ioctl is available starting with 2.1.50. */ 80 #if __LINUX_KERNEL_VERSION >= 131408 81 # define __ASSUME_SIOCGIFNAME 1 82 #endif 83 84 /* MSG_NOSIGNAL was at least available with Linux 2.2.0. */ 85 #if __LINUX_KERNEL_VERSION >= 131584 86 # define __ASSUME_MSG_NOSIGNAL 1 87 #endif 88 89 /* On x86 another `getrlimit' syscall was added in 2.3.25. */ 90 #if __LINUX_KERNEL_VERSION >= 131865 && defined __i386__ 91 # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1 92 #endif 93 94 /* On x86 the truncate64/ftruncate64 syscalls were introduced in 2.3.31. */ 95 #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__ 96 # define __ASSUME_TRUNCATE64_SYSCALL 1 97 #endif 98 99 /* On x86 the mmap2 syscall was introduced in 2.3.31. */ 100 #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__ 101 # define __ASSUME_MMAP2_SYSCALL 1 102 #endif 103 104 /* On x86 the stat64/lstat64/fstat64 syscalls were introduced in 2.3.34. */ 105 #if __LINUX_KERNEL_VERSION >= 131874 && defined __i386__ 106 # define __ASSUME_STAT64_SYSCALL 1 107 #endif 108 109 /* On sparc and ARM the truncate64/ftruncate64/mmap2/stat64/lstat64/fstat64 110 syscalls were introduced in 2.3.35. */ 111 #if __LINUX_KERNEL_VERSION >= 131875 && (defined __sparc__ || defined __arm__) 112 # define __ASSUME_TRUNCATE64_SYSCALL 1 113 # define __ASSUME_MMAP2_SYSCALL 1 114 # define __ASSUME_STAT64_SYSCALL 1 115 #endif 116 117 /* I know for sure that getrlimit are in 2.3.35 on powerpc. */ 118 #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__ 119 # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1 120 #endif 121 122 /* I know for sure that these are in 2.3.35 on powerpc. But PowerPC64 does not 123 support separate 64-bit syscalls, already 64-bit */ 124 #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__ \ 125 && !defined __powerpc64__ 126 # define __ASSUME_TRUNCATE64_SYSCALL 1 127 # define __ASSUME_STAT64_SYSCALL 1 128 #endif 129 130 /* Linux 2.3.39 introduced 32bit UID/GIDs. Some platforms had 32 131 bit type all along. */ 132 #if __LINUX_KERNEL_VERSION >= 131879 || defined __powerpc__ || defined __mips__ 133 # define __ASSUME_32BITUIDS 1 134 #endif 135 136 /* Linux 2.3.39 sparc added setresuid. */ 137 #if __LINUX_KERNEL_VERSION >= 131879 && defined __sparc__ 138 # define __ASSUME_SETRESUID_SYSCALL 1 139 #endif 140 141 #if __LINUX_KERNEL_VERSION >= 131879 142 # define __ASSUME_SETRESGID_SYSCALL 1 143 #endif 144 145 /* Linux 2.3.39 introduced IPC64. Except for powerpc. */ 146 #if __LINUX_KERNEL_VERSION >= 131879 && !defined __powerpc__ 147 # define __ASSUME_IPC64 1 148 #endif 149 150 /* MIPS platforms had IPC64 all along. */ 151 #if defined __mips__ 152 # define __ASSUME_IPC64 1 153 #endif 154 155 /* We can use the LDTs for threading with Linux 2.3.99 and newer. */ 156 #if __LINUX_KERNEL_VERSION >= 131939 157 # define __ASSUME_LDT_WORKS 1 158 #endif 159 160 /* Linux 2.4.0 on PPC introduced a correct IPC64. But PowerPC64 does not 161 support a separate 64-bit sys call, already 64-bit */ 162 #if __LINUX_KERNEL_VERSION >= 132096 && defined __powerpc__ \ 163 && !defined __powerpc64__ 164 # define __ASSUME_IPC64 1 165 #endif 166 167 /* SH kernels got stat64, mmap2, and truncate64 during 2.4.0-test. */ 168 #if __LINUX_KERNEL_VERSION >= 132096 && defined __sh__ 169 # define __ASSUME_TRUNCATE64_SYSCALL 1 170 # define __ASSUME_MMAP2_SYSCALL 1 171 # define __ASSUME_STAT64_SYSCALL 1 172 #endif 173 174 /* The changed st_ino field appeared in 2.4.0-test6. But we cannot 175 distinguish this version from other 2.4.0 releases. Therefore play 176 save and assume it available is for 2.4.1 and up. However, SH is lame, 177 and still does not have a 64-bit inode field. */ 178 #if __LINUX_KERNEL_VERSION >= 132097 && !defined __alpha__ && !defined __sh__ 179 # define __ASSUME_ST_INO_64_BIT 1 180 #endif 181 182 /* To support locking of large files a new fcntl() syscall was introduced 183 in 2.4.0-test7. We test for 2.4.1 for the earliest version we know 184 the syscall is available. */ 185 #if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __sparc__) 186 # define __ASSUME_FCNTL64 1 187 #endif 188 189 /* The AT_CLKTCK auxiliary vector entry was introduction in the 2.4.0 190 series. */ 191 #if __LINUX_KERNEL_VERSION >= 132097 192 # define __ASSUME_AT_CLKTCK 1 193 #endif 194 195 /* Arm got fcntl64 in 2.4.4, PowerPC and SH have it also in 2.4.4 (I 196 don't know when it got introduced). But PowerPC64 does not support 197 separate FCNTL64 call, FCNTL is already 64-bit */ 198 #if __LINUX_KERNEL_VERSION >= 132100 \ 199 && (defined __arm__ || defined __powerpc__ || defined __sh__) \ 200 && !defined __powerpc64__ 201 # define __ASSUME_FCNTL64 1 202 #endif 203 204 /* The getdents64 syscall was introduced in 2.4.0-test7. We test for 205 2.4.1 for the earliest version we know the syscall is available. */ 206 #if __LINUX_KERNEL_VERSION >= 132097 207 # define __ASSUME_GETDENTS64_SYSCALL 1 208 #endif 209 210 /* When did O_DIRECTORY became available? Early in 2.3 but when? 211 Be safe, use 2.3.99. */ 212 #if __LINUX_KERNEL_VERSION >= 131939 213 # define __ASSUME_O_DIRECTORY 1 214 #endif 215 216 /* Starting with one of the 2.4.0 pre-releases the Linux kernel passes 217 up the page size information. */ 218 #if __LINUX_KERNEL_VERSION >= 132097 219 # define __ASSUME_AT_PAGESIZE 1 220 #endif 221 222 /* Starting with at least 2.4.0 the kernel passes the uid/gid unconditionally 223 up to the child. */ 224 #if __LINUX_KERNEL_VERSION >= 132097 225 # define __ASSUME_AT_XID 1 226 #endif 227 228 /* Starting with 2.4.5 kernels PPC passes the AUXV in the standard way 229 and the vfork syscall made it into the official kernel. */ 230 #if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__ 231 # define __ASSUME_STD_AUXV 1 232 # define __ASSUME_VFORK_SYSCALL 1 233 #endif 234 235 /* Starting with 2.4.5 kernels the mmap2 syscall made it into the official 236 kernel. But PowerPC64 does not support a separate MMAP2 call. */ 237 #if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__ \ 238 && !defined __powerpc64__ 239 # define __ASSUME_MMAP2_SYSCALL 1 240 #endif 241 242 /* Starting with 2.4.21 PowerPC implements the new prctl syscall. 243 This allows applications to get/set the Floating Point Exception Mode. */ 244 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__ 245 # define __ASSUME_NEW_PRCTL_SYSCALL 1 246 #endif 247 248 /* Starting with 2.4.21 the PowerPC32 clone syscall works as expected. */ 249 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__ \ 250 && !defined __powerpc64__ 251 # define __ASSUME_FIXED_CLONE_SYSCALL 1 252 #endif 253 254 /* Starting with 2.4.21 PowerPC64 implements the new rt_sigreturn syscall. 255 The new rt_sigreturn takes an ucontext pointer allowing rt_sigreturn 256 to be used in the set/swapcontext implementation. */ 257 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc64__ 258 # define __ASSUME_NEW_RT_SIGRETURN_SYSCALL 1 259 #endif 260 261 /* On x86, the set_thread_area syscall was introduced in 2.5.29, but its 262 semantics was changed in 2.5.30, and again after 2.5.31. */ 263 #if __LINUX_KERNEL_VERSION >= 132384 && defined __i386__ 264 # define __ASSUME_SET_THREAD_AREA_SYSCALL 1 265 #endif 266 267 /* The vfork syscall on x86 and arm was definitely available in 2.4. */ 268 #if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __arm__) 269 # define __ASSUME_VFORK_SYSCALL 1 270 #endif 271 272 /* There are an infinite number of PA-RISC kernel versions numbered 273 2.4.0. But they've not really been released as such. We require 274 and expect the final version here. */ 275 #ifdef __hppa__ 276 # define __ASSUME_32BITUIDS 1 277 # define __ASSUME_TRUNCATE64_SYSCALL 1 278 # define __ASSUME_MMAP2_SYSCALL 1 279 # define __ASSUME_STAT64_SYSCALL 1 280 # define __ASSUME_IPC64 1 281 # define __ASSUME_ST_INO_64_BIT 1 282 # define __ASSUME_FCNTL64 1 283 # define __ASSUME_GETDENTS64_SYSCALL 1 284 #endif 285 286 /* Alpha switched to a 64-bit timeval sometime before 2.2.0. */ 287 #if __LINUX_KERNEL_VERSION >= 131584 && defined __alpha__ 288 # define __ASSUME_TIMEVAL64 1 289 #endif 290 291 #if defined __mips__ && _MIPS_SIM == _ABIN32 292 # define __ASSUME_FCNTL64 1 293 #endif 294 295 /* The late 2.5 kernels saw a lot of new CLONE_* flags. Summarize 296 their availability with one define. The changes were made first 297 for i386 and the have to be done separately for the other archs. 298 For i386 we pick 2.5.50 as the first version with support. */ 299 #if __LINUX_KERNEL_VERSION >= 132402 && defined __i386__ 300 # define __ASSUME_CLONE_THREAD_FLAGS 1 301 #endif 302 303 /* Support for various CLOEXEC and NONBLOCK flags was added for x86, 304 x86-64, PPC, IA-64, SPARC< and S390 in 2.6.23. */ 305 #if __LINUX_KERNEL_VERSION >= 0x020617 \ 306 && (defined __i386__ || defined __x86_64__ || defined __powerpc__ \ 307 || defined __ia64__ || defined __sparc__ || defined __s390__) 308 # define __ASSUME_O_CLOEXEC 1 309 #endif 310 311 /* Support for various CLOEXEC and NONBLOCK flags was added for x86, 312 * x86-64, PPC, IA-64, and SPARC in 2.6.27. */ 313 #if (__LINUX_KERNEL_VERSION >= 0x02061b \ 314 && (defined __i386__ || defined __x86_64__ || defined __powerpc__ \ 315 || defined __ia64__ || defined __sparc__ || defined __s390__) \ 316 ) || (__LINUX_KERNEL_VERSION >= 0x020621 && defined __alpha__) \ 317 || defined __aarch64__ || defined __tile__ 318 /* # define __ASSUME_SOCK_CLOEXEC 1 */ 319 /* # define __ASSUME_IN_NONBLOCK 1 */ 320 # define __ASSUME_PIPE2 1 321 /* # define __ASSUME_EVENTFD2 1 */ 322 /* # define __ASSUME_SIGNALFD4 1 */ 323 /* # define __ASSUME_DUP3 1 */ 324 #endif 325 326 /* These features were surely available with 2.4.12. */ 327 #if __LINUX_KERNEL_VERSION >= 132108 && defined __mc68000__ 328 # define __ASSUME_MMAP2_SYSCALL 1 329 # define __ASSUME_TRUNCATE64_SYSCALL 1 330 # define __ASSUME_STAT64_SYSCALL 1 331 # define __ASSUME_FCNTL64 1 332 # define __ASSUME_VFORK_SYSCALL 1 333 #endif 334 335 /* Beginning with 2.5.63 support for realtime and monotonic clocks and 336 timers based on them is available. */ 337 #if __LINUX_KERNEL_VERSION >= 132415 338 # define __ASSUME_POSIX_TIMERS 1 339 #endif 340 341 /* Beginning with 2.6.12 the clock and timer supports CPU clocks. */ 342 #if __LINUX_KERNEL_VERSION >= 0x2060c 343 # define __ASSUME_POSIX_CPU_TIMERS 1 344 #endif 345 346 /* The late 2.5 kernels saw a lot of new CLONE_* flags. Summarize 347 their availability with one define. The changes were made first 348 for i386 and the have to be done separately for the other archs. 349 For ia64, s390*, PPC, x86-64 we pick 2.5.64 as the first version 350 with support. */ 351 #if __LINUX_KERNEL_VERSION >= 132416 \ 352 && (defined __ia64__ || defined __s390__ || defined __powerpc__ \ 353 || defined __x86_64__ || defined __sh__) 354 # define __ASSUME_CLONE_THREAD_FLAGS 1 355 #endif 356 357 /* With kernel 2.4.17 we always have netlink support. */ 358 #if __LINUX_KERNEL_VERSION >= (132096+17) 359 # define __ASSUME_NETLINK_SUPPORT 1 360 #endif 361 362 /* The requeue futex functionality was introduced in 2.5.70. */ 363 #if __LINUX_KERNEL_VERSION >= 132422 364 # define __ASSUME_FUTEX_REQUEUE 1 365 #endif 366 367 /* The statfs64 syscalls are available in 2.5.74. */ 368 #if __LINUX_KERNEL_VERSION >= 132426 369 # define __ASSUME_STATFS64 1 370 #endif 371 372 /* Starting with at least 2.5.74 the kernel passes the setuid-like exec 373 flag unconditionally up to the child. */ 374 #if __LINUX_KERNEL_VERSION >= 132426 375 # define __ASSUME_AT_SECURE 1 376 #endif 377 378 /* Starting with the 2.5.75 kernel the kernel fills in the correct value 379 in the si_pid field passed as part of the siginfo_t struct to signal 380 handlers. */ 381 #if __LINUX_KERNEL_VERSION >= 132427 382 # define __ASSUME_CORRECT_SI_PID 1 383 #endif 384 385 /* The tgkill syscall was instroduced for i386 in 2.5.75. For Alpha 386 it was introduced in 2.6.0-test1 which unfortunately cannot be 387 distinguished from 2.6.0. On x86-64, ppc, and ppc64 it was 388 introduced in 2.6.0-test3. */ 389 #if (__LINUX_KERNEL_VERSION >= 132427 && defined __i386__) \ 390 || (__LINUX_KERNEL_VERSION >= 132609 && defined __alpha__) \ 391 || (__LINUX_KERNEL_VERSION >= 132609 && defined __x86_64__) \ 392 || (__LINUX_KERNEL_VERSION >= 132609 && defined __powerpc__) \ 393 || (__LINUX_KERNEL_VERSION >= 132609 && defined __sh__) 394 # define __ASSUME_TGKILL 1 395 #endif 396 397 /* The utimes syscall has been available for some architectures 398 forever. For x86 it was introduced after 2.5.75, for x86-64, 399 ppc, and ppc64 it was introduced in 2.6.0-test3. */ 400 #if defined __alpha__ || defined __ia64__ || defined __hppa__ \ 401 || defined __sparc__ \ 402 || (__LINUX_KERNEL_VERSION > 132427 && defined __i386__) \ 403 || (__LINUX_KERNEL_VERSION > 132609 && defined __x86_64__) \ 404 || (__LINUX_KERNEL_VERSION >= 132609 && defined __powerpc__) \ 405 || (__LINUX_KERNEL_VERSION >= 132609 && defined __sh__) 406 # define __ASSUME_UTIMES 1 407 #endif 408 409 // XXX Disabled for now since the semantics we want is not achieved. 410 #if 0 411 /* The CLONE_STOPPED flag was introduced in the 2.6.0-test1 series. */ 412 #if __LINUX_KERNEL_VERSION >= 132609 413 # define __ASSUME_CLONE_STOPPED 1 414 #endif 415 #endif 416 417 /* The fixed version of the posix_fadvise64 syscall appeared in 418 2.6.0-test3. At least for x86. Powerpc support appeared in 419 2.6.2, but for 32-bit userspace only. */ 420 #if (__LINUX_KERNEL_VERSION >= 132609 && defined __i386__) \ 421 || (__LINUX_KERNEL_VERSION >= 132610 && defined __powerpc__ \ 422 && !defined __powerpc64__) 423 # define __ASSUME_FADVISE64_64_SYSCALL 1 424 #endif 425 426 /* The PROT_GROWSDOWN/PROT_GROWSUP flags were introduced in the 2.6.0-test 427 series. */ 428 #if __LINUX_KERNEL_VERSION >= 132609 429 # define __ASSUME_PROT_GROWSUPDOWN 1 430 #endif 431 432 /* Starting with 2.6.0 PowerPC adds signal/swapcontext support for Vector 433 SIMD (AKA Altivec, VMX) instructions and register state. This changes 434 the overall size of the sigcontext and adds the swapcontext syscall. */ 435 #if __LINUX_KERNEL_VERSION >= 132608 && defined __powerpc__ 436 # define __ASSUME_SWAPCONTEXT_SYSCALL 1 437 #endif 438 439 /* The CLONE_DETACHED flag is not necessary in 2.6.2 kernels, it is 440 implied. */ 441 #if __LINUX_KERNEL_VERSION >= 132610 442 # define __ASSUME_NO_CLONE_DETACHED 1 443 #endif 444 445 /* Starting with version 2.6.4-rc1 the getdents syscall returns d_type 446 information as well and in between 2.6.5 and 2.6.8 most compat wrappers 447 were fixed too. Except s390{,x} which was fixed in 2.6.11. */ 448 #if (__LINUX_KERNEL_VERSION >= 0x020608 && !defined __s390__) \ 449 || (__LINUX_KERNEL_VERSION >= 0x02060b && defined __s390__) 450 # define __ASSUME_GETDENTS32_D_TYPE 1 451 #endif 452 453 /* Starting with version 2.5.3, the initial location returned by `brk' 454 after exec is always rounded up to the next page. */ 455 #if __LINUX_KERNEL_VERSION >= 132355 456 # define __ASSUME_BRK_PAGE_ROUNDED 1 457 #endif 458 459 /* Starting with version 2.6.9, the waitid system call is available. 460 Except for powerpc and powerpc64, where it is available in 2.6.12. */ 461 #if (__LINUX_KERNEL_VERSION >= 0x020609 && !defined __powerpc__) \ 462 || (__LINUX_KERNEL_VERSION >= 0x02060c && defined __powerpc__) 463 # define __ASSUME_WAITID_SYSCALL 1 464 #endif 465 466 /* Starting with version 2.6.9, SSI_IEEE_RAISE_EXCEPTION exists. */ 467 #if __LINUX_KERNEL_VERSION >= 0x020609 && defined __alpha__ 468 #define __ASSUME_IEEE_RAISE_EXCEPTION 1 469 #endif 470 471 /* Support for the accept4 syscall was added in 2.6.28. */ 472 #if __LINUX_KERNEL_VERSION >= 0x02061c \ 473 && (defined __i386__ || defined __x86_64__ || defined __powerpc__ \ 474 || defined __sparc__ || defined __s390__) 475 # define __ASSUME_ACCEPT4 1 476 #endif 477 478 /* Support for the accept4 syscall for alpha was added after 2.6.33-rc1. */ 479 #if __LINUX_KERNEL_VERSION >= 0x020621 && defined __alpha__ 480 # define __ASSUME_ACCEPT4 1 481 #endif 482 483 /* Support for the FUTEX_CLOCK_REALTIME flag was added in 2.6.29. */ 484 #if __LINUX_KERNEL_VERSION >= 0x02061d 485 # define __ASSUME_FUTEX_CLOCK_REALTIME 1 486 #endif 487 488 /* Support for PI futexes was added in 2.6.18. */ 489 #if __LINUX_KERNEL_VERSION >= 0x020612 490 # define __ASSUME_FUTEX_LOCK_PI 1 491 #endif 492 493 /* Support for private futexes was added in 2.6.22. */ 494 #if __LINUX_KERNEL_VERSION >= 0x020616 495 # define __ASSUME_PRIVATE_FUTEX 1 496 #endif 497 498 /* Support for fallocate was added in 2.6.23, 499 on s390 only after 2.6.23-rc1, on alpha only after 2.6.33-rc1. */ 500 #if __LINUX_KERNEL_VERSION >= 0x020617 \ 501 && (!defined __s390__ || __LINUX_KERNEL_VERSION >= 0x020618) \ 502 && (!defined __alpha__ || __LINUX_KERNEL_VERSION >= 0x020621) 503 # define __ASSUME_FALLOCATE 1 504 #endif 505 506 /* getcpu is a syscall for x86-64 since 3.1. */ 507 #if defined __x86_64__ && __LINUX_KERNEL_VERSION >= 0x030100 508 # define __ASSUME_GETCPU_SYSCALL 1 509 #endif 510