release/src-rt-6.x.4708/toolchains/hndtools-arm-linux-2.6.36-uclibc-4.5.3/arm-brcm-linux-uclibcgnueabi/sysroot/usr/include/bits/kernel-features.h

   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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 /* This file must not contain any C code.  At least it must be protected
  22    to allow using the file also in assembler files.  */
  23
  24 #if defined __mips__
  25 # include <sgidefs.h>
  26 #endif
  27
  28 #include <linux/version.h>
  29 #define __LINUX_KERNEL_VERSION          LINUX_VERSION_CODE
  30
  31 /* We assume for __LINUX_KERNEL_VERSION the same encoding used in
  32    linux/version.h.  I.e., the major, minor, and subminor all get a
  33    byte with the major number being in the highest byte.  This means
  34    we can do numeric comparisons.
  35
  36    In the following we will define certain symbols depending on
  37    whether the describes kernel feature is available in the kernel
  38    version given by __LINUX_KERNEL_VERSION.  We are not always exactly
  39    recording the correct versions in which the features were
  40    introduced.  If somebody cares these values can afterwards be
  41    corrected.  Most of the numbers here are set corresponding to
  42    2.2.0.  */
  43
  44 /* `getcwd' system call.  */
  45 #if __LINUX_KERNEL_VERSION >= 131584
  46 # define __ASSUME_GETCWD_SYSCALL        1
  47 #endif
  48
  49 /* When was `poll' introduced?  */
  50 #if __LINUX_KERNEL_VERSION >= 131584
  51 # define __ASSUME_POLL_SYSCALL          1
  52 #endif
  53
  54 /* Real-time signal became usable in 2.1.70.  */
  55 #if __LINUX_KERNEL_VERSION >= 131398
  56 # define __ASSUME_REALTIME_SIGNALS      1
  57 #endif
  58
  59 /* When were the `pread'/`pwrite' syscalls introduced?  */
  60 #if __LINUX_KERNEL_VERSION >= 131584
  61 # define __ASSUME_PREAD_SYSCALL         1
  62 # define __ASSUME_PWRITE_SYSCALL        1
  63 #endif
  64
  65 /* When was `poll' introduced?  */
  66 #if __LINUX_KERNEL_VERSION >= 131584
  67 # define __ASSUME_POLL_SYSCALL          1
  68 #endif
  69
  70 /* The `lchown' syscall was introduced in 2.1.80.  */
  71 #if __LINUX_KERNEL_VERSION >= 131408
  72 # define __ASSUME_LCHOWN_SYSCALL        1
  73 #endif
  74
  75 /* When did the `setresuid' sysall became available?  */
  76 #if __LINUX_KERNEL_VERSION >= 131584 && !defined __sparc__
  77 # define __ASSUME_SETRESUID_SYSCALL     1
  78 #endif
  79
  80 /* The SIOCGIFNAME ioctl is available starting with 2.1.50.  */
  81 #if __LINUX_KERNEL_VERSION >= 131408
  82 # define __ASSUME_SIOCGIFNAME           1
  83 #endif
  84
  85 /* MSG_NOSIGNAL was at least available with Linux 2.2.0.  */
  86 #if __LINUX_KERNEL_VERSION >= 131584
  87 # define __ASSUME_MSG_NOSIGNAL          1
  88 #endif
  89
  90 /* On x86 another `getrlimit' syscall was added in 2.3.25.  */
  91 #if __LINUX_KERNEL_VERSION >= 131865 && defined __i386__
  92 # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
  93 #endif
  94
  95 /* On x86 the truncate64/ftruncate64 syscalls were introduced in 2.3.31.  */
  96 #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
  97 # define __ASSUME_TRUNCATE64_SYSCALL    1
  98 #endif
  99
 100 /* On x86 the mmap2 syscall was introduced in 2.3.31.  */
 101 #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
 102 # define __ASSUME_MMAP2_SYSCALL 1
 103 #endif
 104
 105 /* On x86 the stat64/lstat64/fstat64 syscalls were introduced in 2.3.34.  */
 106 #if __LINUX_KERNEL_VERSION >= 131874 && defined __i386__
 107 # define __ASSUME_STAT64_SYSCALL        1
 108 #endif
 109
 110 /* On sparc and ARM the truncate64/ftruncate64/mmap2/stat64/lstat64/fstat64
 111    syscalls were introduced in 2.3.35.  */
 112 #if __LINUX_KERNEL_VERSION >= 131875 && (defined __sparc__ || defined __arm__)
 113 # define __ASSUME_TRUNCATE64_SYSCALL    1
 114 # define __ASSUME_MMAP2_SYSCALL         1
 115 # define __ASSUME_STAT64_SYSCALL        1
 116 #endif
 117
 118 /* I know for sure that getrlimit are in 2.3.35 on powerpc.  */
 119 #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__
 120 # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
 121 #endif
 122
 123 /* I know for sure that these are in 2.3.35 on powerpc. But PowerPC64 does not
 124    support separate 64-bit syscalls, already 64-bit */
 125 #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__ \
 126     && !defined __powerpc64__
 127 # define __ASSUME_TRUNCATE64_SYSCALL    1
 128 # define __ASSUME_STAT64_SYSCALL        1
 129 #endif
 130
 131 /* Linux 2.3.39 introduced 32bit UID/GIDs.  Some platforms had 32
 132    bit type all along.  */
 133 #if __LINUX_KERNEL_VERSION >= 131879 || defined __powerpc__ || defined __mips__
 134 # define __ASSUME_32BITUIDS             1
 135 #endif
 136
 137 /* Linux 2.3.39 sparc added setresuid.  */
 138 #if __LINUX_KERNEL_VERSION >= 131879 && defined __sparc__
 139 # define __ASSUME_SETRESUID_SYSCALL     1
 140 #endif
 141
 142 #if __LINUX_KERNEL_VERSION >= 131879
 143 # define __ASSUME_SETRESGID_SYSCALL     1
 144 #endif
 145
 146 /* Linux 2.3.39 introduced IPC64.  Except for powerpc.  */
 147 #if __LINUX_KERNEL_VERSION >= 131879 && !defined __powerpc__
 148 # define __ASSUME_IPC64         1
 149 #endif
 150
 151 /* MIPS platforms had IPC64 all along.  */
 152 #if defined __mips__
 153 # define __ASSUME_IPC64         1
 154 #endif
 155
 156 /* We can use the LDTs for threading with Linux 2.3.99 and newer.  */
 157 #if __LINUX_KERNEL_VERSION >= 131939
 158 # define __ASSUME_LDT_WORKS             1
 159 #endif
 160
 161 /* Linux 2.4.0 on PPC introduced a correct IPC64. But PowerPC64 does not
 162    support a separate 64-bit sys call, already 64-bit */
 163 #if __LINUX_KERNEL_VERSION >= 132096 && defined __powerpc__ \
 164     && !defined __powerpc64__
 165 # define __ASSUME_IPC64                 1
 166 #endif
 167
 168 /* SH kernels got stat64, mmap2, and truncate64 during 2.4.0-test.  */
 169 #if __LINUX_KERNEL_VERSION >= 132096 && defined __sh__
 170 # define __ASSUME_TRUNCATE64_SYSCALL    1
 171 # define __ASSUME_MMAP2_SYSCALL         1
 172 # define __ASSUME_STAT64_SYSCALL        1
 173 #endif
 174
 175 /* The changed st_ino field appeared in 2.4.0-test6.  But we cannot
 176    distinguish this version from other 2.4.0 releases.  Therefore play
 177    save and assume it available is for 2.4.1 and up.  However, SH is lame,
 178    and still does not have a 64-bit inode field.  */
 179 #if __LINUX_KERNEL_VERSION >= 132097 && !defined __alpha__ && !defined __sh__
 180 # define __ASSUME_ST_INO_64_BIT         1
 181 #endif
 182
 183 /* To support locking of large files a new fcntl() syscall was introduced
 184    in 2.4.0-test7.  We test for 2.4.1 for the earliest version we know
 185    the syscall is available.  */
 186 #if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __sparc__)
 187 # define __ASSUME_FCNTL64               1
 188 #endif
 189
 190 /* The AT_CLKTCK auxiliary vector entry was introduction in the 2.4.0
 191    series.  */
 192 #if __LINUX_KERNEL_VERSION >= 132097
 193 # define __ASSUME_AT_CLKTCK             1
 194 #endif
 195
 196 /* Arm got fcntl64 in 2.4.4, PowerPC and SH have it also in 2.4.4 (I
 197    don't know when it got introduced).  But PowerPC64 does not support
 198    separate FCNTL64 call, FCNTL is already 64-bit */
 199 #if __LINUX_KERNEL_VERSION >= 132100 \
 200     && (defined __arm__ || defined __powerpc__ || defined __sh__) \
 201     && !defined __powerpc64__
 202 # define __ASSUME_FCNTL64               1
 203 #endif
 204
 205 /* The getdents64 syscall was introduced in 2.4.0-test7.  We test for
 206    2.4.1 for the earliest version we know the syscall is available.  */
 207 #if __LINUX_KERNEL_VERSION >= 132097
 208 # define __ASSUME_GETDENTS64_SYSCALL    1
 209 #endif
 210
 211 /* When did O_DIRECTORY became available?  Early in 2.3 but when?
 212    Be safe, use 2.3.99.  */
 213 #if __LINUX_KERNEL_VERSION >= 131939
 214 # define __ASSUME_O_DIRECTORY           1
 215 #endif
 216
 217 /* Starting with one of the 2.4.0 pre-releases the Linux kernel passes
 218    up the page size information.  */
 219 #if __LINUX_KERNEL_VERSION >= 132097
 220 # define __ASSUME_AT_PAGESIZE           1
 221 #endif
 222
 223 /* Starting with at least 2.4.0 the kernel passes the uid/gid unconditionally
 224    up to the child.  */
 225 #if __LINUX_KERNEL_VERSION >= 132097
 226 # define __ASSUME_AT_XID                1
 227 #endif
 228
 229 /* Starting with 2.4.5 kernels PPC passes the AUXV in the standard way
 230    and the vfork syscall made it into the official kernel.  */
 231 #if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__
 232 # define __ASSUME_STD_AUXV              1
 233 # define __ASSUME_VFORK_SYSCALL         1
 234 #endif
 235
 236 /* Starting with 2.4.5 kernels the mmap2 syscall made it into the official
 237    kernel.  But PowerPC64 does not support a separate MMAP2 call.  */
 238 #if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__ \
 239     && !defined __powerpc64__
 240 # define __ASSUME_MMAP2_SYSCALL         1
 241 #endif
 242
 243 /* Starting with 2.4.21 PowerPC implements the new prctl syscall.
 244    This allows applications to get/set the Floating Point Exception Mode.  */
 245 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__
 246 # define __ASSUME_NEW_PRCTL_SYSCALL             1
 247 #endif
 248
 249 /* Starting with 2.4.21 the PowerPC32 clone syscall works as expected.  */
 250 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__ \
 251     && !defined __powerpc64__
 252 # define __ASSUME_FIXED_CLONE_SYSCALL           1
 253 #endif
 254
 255 /* Starting with 2.4.21 PowerPC64 implements the new rt_sigreturn syscall.
 256    The new rt_sigreturn takes an ucontext pointer allowing rt_sigreturn
 257    to be used in the set/swapcontext implementation.  */
 258 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc64__
 259 # define __ASSUME_NEW_RT_SIGRETURN_SYSCALL              1
 260 #endif
 261
 262 /* On x86, the set_thread_area syscall was introduced in 2.5.29, but its
 263    semantics was changed in 2.5.30, and again after 2.5.31.  */
 264 #if __LINUX_KERNEL_VERSION >= 132384 && defined __i386__
 265 # define __ASSUME_SET_THREAD_AREA_SYSCALL       1
 266 #endif
 267
 268 /* The vfork syscall on x86 and arm was definitely available in 2.4.  */
 269 #if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __arm__)
 270 # define __ASSUME_VFORK_SYSCALL         1
 271 #endif
 272
 273 /* There are an infinite number of PA-RISC kernel versions numbered
 274    2.4.0.  But they've not really been released as such.  We require
 275    and expect the final version here.  */
 276 #ifdef __hppa__
 277 # define __ASSUME_32BITUIDS             1
 278 # define __ASSUME_TRUNCATE64_SYSCALL    1
 279 # define __ASSUME_MMAP2_SYSCALL         1
 280 # define __ASSUME_STAT64_SYSCALL        1
 281 # define __ASSUME_IPC64                 1
 282 # define __ASSUME_ST_INO_64_BIT         1
 283 # define __ASSUME_FCNTL64               1
 284 # define __ASSUME_GETDENTS64_SYSCALL    1
 285 #endif
 286
 287 /* Alpha switched to a 64-bit timeval sometime before 2.2.0.  */
 288 #if __LINUX_KERNEL_VERSION >= 131584 && defined __alpha__
 289 # define __ASSUME_TIMEVAL64             1
 290 #endif
 291
 292 #if defined __mips__ && _MIPS_SIM == _ABIN32
 293 # define __ASSUME_FCNTL64               1
 294 #endif
 295
 296 /* The late 2.5 kernels saw a lot of new CLONE_* flags.  Summarize
 297    their availability with one define.  The changes were made first
 298    for i386 and the have to be done separately for the other archs.
 299    For i386 we pick 2.5.50 as the first version with support.  */
 300 #if __LINUX_KERNEL_VERSION >= 132402 && defined __i386__
 301 # define __ASSUME_CLONE_THREAD_FLAGS    1
 302 #endif
 303
 304 /* Support for various CLOEXEC and NONBLOCK flags was added for x86,
 305    x86-64, PPC, IA-64, SPARC< and S390 in 2.6.23.  */
 306 #if __LINUX_KERNEL_VERSION >= 0x020617 \
 307     && (defined __i386__ || defined __x86_64__ || defined __powerpc__ \
 308         || defined __ia64__ || defined __sparc__ || defined __s390__)
 309 # define __ASSUME_O_CLOEXEC 1
 310 #endif
 311
 312 /* Support for various CLOEXEC and NONBLOCK flags was added for x86,
 313  *    x86-64, PPC, IA-64, and SPARC in 2.6.27.  */
 314 #if __LINUX_KERNEL_VERSION >= 0x02061b \
 315     && (defined __i386__ || defined __x86_64__ || defined __powerpc__ \
 316         || defined __ia64__ || defined __sparc__ || defined __s390__)
 317 /* # define __ASSUME_SOCK_CLOEXEC  1 */
 318 /* # define __ASSUME_IN_NONBLOCK   1 */
 319 # define __ASSUME_PIPE2         1
 320 /* # define __ASSUME_EVENTFD2      1 */
 321 /* # define __ASSUME_SIGNALFD4     1 */
 322 #endif
 323
 324
 325 /* These features were surely available with 2.4.12.  */
 326 #if __LINUX_KERNEL_VERSION >= 132108 && defined __mc68000__
 327 # define __ASSUME_MMAP2_SYSCALL         1
 328 # define __ASSUME_TRUNCATE64_SYSCALL    1
 329 # define __ASSUME_STAT64_SYSCALL        1
 330 # define __ASSUME_FCNTL64               1
 331 # define __ASSUME_VFORK_SYSCALL         1
 332 #endif
 333
 334 /* Beginning with 2.5.63 support for realtime and monotonic clocks and
 335    timers based on them is available.  */
 336 #if __LINUX_KERNEL_VERSION >= 132415
 337 # define __ASSUME_POSIX_TIMERS          1
 338 #endif
 339
 340 /* Beginning with 2.6.12 the clock and timer supports CPU clocks.  */
 341 #if __LINUX_KERNEL_VERSION >= 0x2060c
 342 # define __ASSUME_POSIX_CPU_TIMERS      1
 343 #endif
 344
 345 /* The late 2.5 kernels saw a lot of new CLONE_* flags.  Summarize
 346    their availability with one define.  The changes were made first
 347    for i386 and the have to be done separately for the other archs.
 348    For ia64, s390*, PPC, x86-64 we pick 2.5.64 as the first version
 349    with support.  */
 350 #if __LINUX_KERNEL_VERSION >= 132416 \
 351     && (defined __ia64__ || defined __s390__ || defined __powerpc__ \
 352         || defined __x86_64__ || defined __sh__)
 353 # define __ASSUME_CLONE_THREAD_FLAGS    1
 354 #endif
 355
 356 /* With kernel 2.4.17 we always have netlink support.  */
 357 #if __LINUX_KERNEL_VERSION >= (132096+17)
 358 # define __ASSUME_NETLINK_SUPPORT       1
 359 #endif
 360
 361 /* The requeue futex functionality was introduced in 2.5.70.  */
 362 #if __LINUX_KERNEL_VERSION >= 132422
 363 # define __ASSUME_FUTEX_REQUEUE 1
 364 #endif
 365
 366 /* The statfs64 syscalls are available in 2.5.74.  */
 367 #if __LINUX_KERNEL_VERSION >= 132426
 368 # define __ASSUME_STATFS64      1
 369 #endif
 370
 371 /* Starting with at least 2.5.74 the kernel passes the setuid-like exec
 372    flag unconditionally up to the child.  */
 373 #if __LINUX_KERNEL_VERSION >= 132426
 374 # define __ASSUME_AT_SECURE     1
 375 #endif
 376
 377 /* Starting with the 2.5.75 kernel the kernel fills in the correct value
 378    in the si_pid field passed as part of the siginfo_t struct to signal
 379    handlers.  */
 380 #if __LINUX_KERNEL_VERSION >= 132427
 381 # define __ASSUME_CORRECT_SI_PID        1
 382 #endif
 383
 384 /* The tgkill syscall was instroduced for i386 in 2.5.75.  For Alpha
 385    it was introduced in 2.6.0-test1 which unfortunately cannot be
 386    distinguished from 2.6.0.  On x86-64, ppc, and ppc64 it was
 387    introduced in 2.6.0-test3. */
 388 #if (__LINUX_KERNEL_VERSION >= 132427 && defined __i386__) \
 389     || (__LINUX_KERNEL_VERSION >= 132609 && defined __alpha__) \
 390     || (__LINUX_KERNEL_VERSION >= 132609 && defined __x86_64__) \
 391     || (__LINUX_KERNEL_VERSION >= 132609 && defined __powerpc__) \
 392     || (__LINUX_KERNEL_VERSION >= 132609 && defined __sh__)
 393 # define __ASSUME_TGKILL        1
 394 #endif
 395
 396 /* The utimes syscall has been available for some architectures
 397    forever.  For x86 it was introduced after 2.5.75, for x86-64,
 398    ppc, and ppc64 it was introduced in 2.6.0-test3.  */
 399 #if defined __alpha__ || defined __ia64__ || defined __hppa__ \
 400     || defined __sparc__ \
 401     || (__LINUX_KERNEL_VERSION > 132427 && defined __i386__) \
 402     || (__LINUX_KERNEL_VERSION > 132609 && defined __x86_64__) \
 403     || (__LINUX_KERNEL_VERSION >= 132609 && defined __powerpc__) \
 404     || (__LINUX_KERNEL_VERSION >= 132609 && defined __sh__)
 405 # define __ASSUME_UTIMES        1
 406 #endif
 407
 408 // XXX Disabled for now since the semantics we want is not achieved.
 409 #if 0
 410 /* The CLONE_STOPPED flag was introduced in the 2.6.0-test1 series.  */
 411 #if __LINUX_KERNEL_VERSION >= 132609
 412 # define __ASSUME_CLONE_STOPPED 1
 413 #endif
 414 #endif
 415
 416 /* The fixed version of the posix_fadvise64 syscall appeared in
 417    2.6.0-test3.  At least for x86.  Powerpc support appeared in
 418    2.6.2, but for 32-bit userspace only.  */
 419 #if (__LINUX_KERNEL_VERSION >= 132609 && defined __i386__) \
 420     || (__LINUX_KERNEL_VERSION >= 132610 && defined __powerpc__ \
 421        && !defined __powerpc64__)
 422 # define __ASSUME_FADVISE64_64_SYSCALL  1
 423 #endif
 424
 425 /* The PROT_GROWSDOWN/PROT_GROWSUP flags were introduced in the 2.6.0-test
 426    series.  */
 427 #if __LINUX_KERNEL_VERSION >= 132609
 428 # define __ASSUME_PROT_GROWSUPDOWN      1
 429 #endif
 430
 431 /* Starting with 2.6.0 PowerPC adds signal/swapcontext support for Vector
 432    SIMD (AKA Altivec, VMX) instructions and register state.  This changes
 433    the overall size of the sigcontext and adds the swapcontext syscall.  */
 434 #if __LINUX_KERNEL_VERSION >= 132608 && defined __powerpc__
 435 # define __ASSUME_SWAPCONTEXT_SYSCALL   1
 436 #endif
 437
 438 /* The CLONE_DETACHED flag is not necessary in 2.6.2 kernels, it is
 439    implied.  */
 440 #if __LINUX_KERNEL_VERSION >= 132610
 441 # define __ASSUME_NO_CLONE_DETACHED     1
 442 #endif
 443
 444 /* Starting with version 2.6.4-rc1 the getdents syscall returns d_type
 445    information as well and in between 2.6.5 and 2.6.8 most compat wrappers
 446    were fixed too.  Except s390{,x} which was fixed in 2.6.11.  */
 447 #if (__LINUX_KERNEL_VERSION >= 0x020608 && !defined __s390__) \
 448     || (__LINUX_KERNEL_VERSION >= 0x02060b && defined __s390__)
 449 # define __ASSUME_GETDENTS32_D_TYPE     1
 450 #endif
 451
 452 /* Starting with version 2.5.3, the initial location returned by `brk'
 453    after exec is always rounded up to the next page.  */
 454 #if __LINUX_KERNEL_VERSION >= 132355
 455 # define __ASSUME_BRK_PAGE_ROUNDED      1
 456 #endif
 457
 458 /* Starting with version 2.6.9, the waitid system call is available.
 459    Except for powerpc and powerpc64, where it is available in 2.6.12.  */
 460 #if (__LINUX_KERNEL_VERSION >= 0x020609 && !defined __powerpc__) \
 461     || (__LINUX_KERNEL_VERSION >= 0x02060c && defined __powerpc__)
 462 # define __ASSUME_WAITID_SYSCALL        1
 463 #endif
 464
 465 /* Starting with version 2.6.9, SSI_IEEE_RAISE_EXCEPTION exists.  */
 466 #if __LINUX_KERNEL_VERSION >= 0x020609 && defined __alpha__
 467 #define __ASSUME_IEEE_RAISE_EXCEPTION   1
 468 #endif
 469
 470 /* Support for the accept4 syscall was added in 2.6.28.  */
 471 #if __LINUX_KERNEL_VERSION >= 0x02061c \
 472     && (defined __i386__ || defined __x86_64__ || defined __powerpc__ \
 473         || defined __sparc__ || defined __s390__)
 474 # define __ASSUME_ACCEPT4       1
 475 #endif
 476
 477 /* Support for the accept4 syscall for alpha was added after 2.6.33-rc1.  */
 478 #if __LINUX_KERNEL_VERSION >= 0x020621 && defined __alpha__
 479 # define __ASSUME_ACCEPT4       1
 480 #endif
 481
 482 /* Support for the FUTEX_CLOCK_REALTIME flag was added in 2.6.29.  */
 483 #if __LINUX_KERNEL_VERSION >= 0x02061d
 484 # define __ASSUME_FUTEX_CLOCK_REALTIME  1
 485 #endif
 486
 487 /* Support for PI futexes was added in 2.6.18.  */
 488 #if __LINUX_KERNEL_VERSION >= 0x020612
 489 # define __ASSUME_FUTEX_LOCK_PI 1
 490 #endif
 491
 492 /* Support for private futexes was added in 2.6.22.  */
 493 #if __LINUX_KERNEL_VERSION >= 0x020616
 494 # define __ASSUME_PRIVATE_FUTEX 1
 495 #endif
 496
 497