config/spl-build.m4

   1 ###############################################################################
   2 # Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
   3 # Copyright (C) 2007 The Regents of the University of California.
   4 # Written by Brian Behlendorf <behlendorf1@llnl.gov>.
   5 ###############################################################################
   6 # SPL_AC_CONFIG_KERNEL: Default SPL kernel configuration.
   7 ###############################################################################
   8
   9 AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
  10         SPL_AC_KERNEL
  11
  12         dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
  13         dnl # compiler options are added by the kernel build system.
  14         abs_srcdir=`readlink -f ${srcdir}`
  15         KERNELCPPFLAGS="$KERNELCPPFLAGS -Wstrict-prototypes -Werror"
  16         KERNELCPPFLAGS="$KERNELCPPFLAGS -I${abs_srcdir}/include"
  17         KERNELCPPFLAGS="$KERNELCPPFLAGS -include ${abs_srcdir}/spl_config.h"
  18
  19         if test "${LINUX_OBJ}" != "${LINUX}"; then
  20                 KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
  21         fi
  22
  23         AC_SUBST(KERNELMAKE_PARAMS)
  24         AC_SUBST(KERNELCPPFLAGS)
  25
  26         SPL_AC_DEBUG
  27         SPL_AC_DEBUG_KMEM
  28         SPL_AC_DEBUG_KMEM_TRACKING
  29         SPL_AC_ATOMIC_SPINLOCK
  30         SPL_AC_TYPE_ATOMIC64_CMPXCHG
  31         SPL_AC_TYPE_ATOMIC64_XCHG
  32         SPL_AC_TYPE_UINTPTR_T
  33         SPL_AC_3ARGS_INIT_WORK
  34         SPL_AC_2ARGS_REGISTER_SYSCTL
  35         SPL_AC_SET_SHRINKER
  36         SPL_AC_PATH_IN_NAMEIDATA
  37         SPL_AC_TASK_CURR
  38         SPL_AC_CTL_UNNUMBERED
  39         SPL_AC_FLS64
  40         SPL_AC_DEVICE_CREATE
  41         SPL_AC_5ARGS_DEVICE_CREATE
  42         SPL_AC_CLASS_DEVICE_CREATE
  43         SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT
  44         SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE
  45         SPL_AC_TIMESPEC_SUB
  46         SPL_AC_INIT_UTSNAME
  47         SPL_AC_FDTABLE_HEADER
  48         SPL_AC_FILES_FDTABLE
  49         SPL_AC_UACCESS_HEADER
  50         SPL_AC_KMALLOC_NODE
  51         SPL_AC_MONOTONIC_CLOCK
  52         SPL_AC_INODE_I_MUTEX
  53         SPL_AC_MUTEX_OWNER
  54         SPL_AC_MUTEX_LOCK_NESTED
  55         SPL_AC_DIV64_64
  56         SPL_AC_DIV64_U64
  57         SPL_AC_3ARGS_ON_EACH_CPU
  58         SPL_AC_KALLSYMS_LOOKUP_NAME
  59         SPL_AC_GET_VMALLOC_INFO
  60         SPL_AC_PGDAT_HELPERS
  61         SPL_AC_FIRST_ONLINE_PGDAT
  62         SPL_AC_NEXT_ONLINE_PGDAT
  63         SPL_AC_NEXT_ZONE
  64         SPL_AC_PGDAT_LIST
  65         SPL_AC_GLOBAL_PAGE_STATE
  66         SPL_AC_ZONE_STAT_ITEM_FREE
  67         SPL_AC_ZONE_STAT_ITEM_INACTIVE
  68         SPL_AC_ZONE_STAT_ITEM_ACTIVE
  69         SPL_AC_GET_ZONE_COUNTS
  70         SPL_AC_SET_FS_PWD
  71         SPL_AC_2ARGS_SET_FS_PWD
  72         SPL_AC_2ARGS_VFS_UNLINK
  73         SPL_AC_4ARGS_VFS_RENAME
  74         SPL_AC_CRED_STRUCT
  75         SPL_AC_GROUPS_SEARCH
  76         SPL_AC_PUT_TASK_STRUCT
  77         SPL_AC_5ARGS_PROC_HANDLER
  78 ])
  79
  80 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
  81         modpost=$LINUX/scripts/Makefile.modpost
  82         AC_MSG_CHECKING([kernel file name for module symbols])
  83         if test -f "$modpost"; then
  84                 if grep -q Modules.symvers $modpost; then
  85                         LINUX_SYMBOLS=Modules.symvers
  86                 else
  87                         LINUX_SYMBOLS=Module.symvers
  88                 fi
  89         else
  90                 LINUX_SYMBOLS=NONE
  91         fi
  92         AC_MSG_RESULT($LINUX_SYMBOLS)
  93         AC_SUBST(LINUX_SYMBOLS)
  94 ])
  95
  96 AC_DEFUN([SPL_AC_KERNEL], [
  97         AC_ARG_WITH([linux],
  98                 AS_HELP_STRING([--with-linux=PATH],
  99                 [Path to kernel source]),
 100                 [kernelsrc="$withval"])
 101
 102         AC_ARG_WITH([linux-obj],
 103                 AS_HELP_STRING([--with-linux-obj=PATH],
 104                 [Path to kernel build objects]),
 105                 [kernelbuild="$withval"])
 106
 107         AC_MSG_CHECKING([kernel source directory])
 108         if test -z "$kernelsrc"; then
 109                 headersdir="/lib/modules/$(uname -r)/build"
 110                 if test -e "$headersdir"; then
 111                         sourcelink=$(readlink -f "$headersdir")
 112                 else
 113                         sourcelink=$(ls -1d /usr/src/kernels/* \
 114                                      /usr/src/linux-* \
 115                                      2>/dev/null | grep -v obj | tail -1)
 116                 fi
 117
 118                 if test -e ${sourcelink}; then
 119                         kernelsrc=`readlink -f ${sourcelink}`
 120                 else
 121                         AC_MSG_RESULT([Not found])
 122                         AC_MSG_ERROR([
 123                         *** Please specify the location of the kernel source
 124                         *** with the '--with-linux=PATH' option])
 125                 fi
 126         else
 127                 if test "$kernelsrc" = "NONE"; then
 128                         kernsrcver=NONE
 129                 fi
 130         fi
 131
 132         AC_MSG_RESULT([$kernelsrc])
 133         AC_MSG_CHECKING([kernel build directory])
 134         if test -z "$kernelbuild"; then
 135                 if test -d ${kernelsrc}-obj/`arch`/`arch`; then
 136                         kernelbuild=${kernelsrc}-obj/`arch`/`arch`
 137                 elif test -d ${kernelsrc}-obj/`arch`/default; then
 138                         kernelbuild=${kernelsrc}-obj/`arch`/default
 139                 elif test -d `dirname ${kernelsrc}`/build-`arch`; then
 140                         kernelbuild=`dirname ${kernelsrc}`/build-`arch`
 141                 else
 142                         kernelbuild=${kernelsrc}
 143                 fi
 144         fi
 145         AC_MSG_RESULT([$kernelbuild])
 146
 147         AC_MSG_CHECKING([kernel source version])
 148         if test -r $kernelbuild/include/linux/version.h &&
 149                 fgrep -q UTS_RELEASE $kernelbuild/include/linux/version.h; then
 150
 151                 kernsrcver=`(echo "#include <linux/version.h>";
 152                              echo "kernsrcver=UTS_RELEASE") |
 153                              cpp -I $kernelbuild/include |
 154                              grep "^kernsrcver=" | cut -d \" -f 2`
 155
 156         elif test -r $kernelbuild/include/linux/utsrelease.h &&
 157                 fgrep -q UTS_RELEASE $kernelbuild/include/linux/utsrelease.h; then
 158
 159                 kernsrcver=`(echo "#include <linux/utsrelease.h>";
 160                              echo "kernsrcver=UTS_RELEASE") |
 161                              cpp -I $kernelbuild/include |
 162                              grep "^kernsrcver=" | cut -d \" -f 2`
 163         fi
 164
 165         if test -z "$kernsrcver"; then
 166                 AC_MSG_RESULT([Not found])
 167                 AC_MSG_ERROR([
 168                 *** Cannot determine the version of the linux kernel source.
 169                 *** Please prepare the kernel before running this script])
 170         fi
 171
 172         AC_MSG_RESULT([$kernsrcver])
 173
 174         LINUX=${kernelsrc}
 175         LINUX_OBJ=${kernelbuild}
 176         LINUX_VERSION=${kernsrcver}
 177
 178         AC_SUBST(LINUX)
 179         AC_SUBST(LINUX_OBJ)
 180         AC_SUBST(LINUX_VERSION)
 181
 182         SPL_AC_MODULE_SYMVERS
 183 ])
 184
 185 dnl #
 186 dnl # Default SPL user configuration
 187 dnl #
 188 AC_DEFUN([SPL_AC_CONFIG_USER], [])
 189
 190 AC_DEFUN([SPL_AC_LICENSE], [
 191         AC_MSG_CHECKING([spl license])
 192         LICENSE=GPL
 193         AC_MSG_RESULT([$LICENSE])
 194         KERNELCPPFLAGS="${KERNELCPPFLAGS} -DHAVE_GPL_ONLY_SYMBOLS"
 195         AC_SUBST(LICENSE)
 196 ])
 197
 198 AC_DEFUN([SPL_AC_CONFIG], [
 199         SPL_CONFIG=all
 200         AC_ARG_WITH([config],
 201                 AS_HELP_STRING([--with-config=CONFIG],
 202                 [Config file 'kernel|user|all|srpm']),
 203                 [SPL_CONFIG="$withval"])
 204
 205         AC_MSG_CHECKING([spl config])
 206         AC_MSG_RESULT([$SPL_CONFIG]);
 207         AC_SUBST(SPL_CONFIG)
 208
 209         case "$SPL_CONFIG" in
 210                 kernel) SPL_AC_CONFIG_KERNEL ;;
 211                 user)   SPL_AC_CONFIG_USER   ;;
 212                 all)    SPL_AC_CONFIG_KERNEL
 213                         SPL_AC_CONFIG_USER   ;;
 214                 srpm)                        ;;
 215                 *)
 216                 AC_MSG_RESULT([Error!])
 217                 AC_MSG_ERROR([Bad value "$SPL_CONFIG" for --with-config,
 218                               user kernel|user|all|srpm]) ;;
 219         esac
 220
 221         AM_CONDITIONAL([CONFIG_USER],
 222                        [test "$SPL_CONFIG" = user] ||
 223                        [test "$SPL_CONFIG" = all])
 224         AM_CONDITIONAL([CONFIG_KERNEL],
 225                        [test "$SPL_CONFIG" = kernel] ||
 226                        [test "$SPL_CONFIG" = all])
 227 ])
 228
 229 dnl #
 230 dnl # Enable if the SPL should be compiled with internal debugging enabled.
 231 dnl # By default this support is disabled.
 232 dnl #
 233 AC_DEFUN([SPL_AC_DEBUG], [
 234         AC_ARG_ENABLE([debug],
 235                 [AS_HELP_STRING([--enable-debug],
 236                 [Enable generic debug support @<:@default=no@:>@])],
 237                 [],
 238                 [enable_debug=no])
 239
 240         AS_IF([test "x$enable_debug" = xyes],
 241                 [KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG"],
 242                 [KERNELCPPFLAGS="${KERNELCPPFLAGS} -DNDEBUG"])
 243
 244         AC_MSG_CHECKING([whether debugging is enabled])
 245         AC_MSG_RESULT([$enable_debug])
 246 ])
 247
 248 dnl #
 249 dnl # Enabled by default it provides a minimal level of memory tracking.
 250 dnl # A total count of bytes allocated is kept for each alloc and free.
 251 dnl # Then at module unload time a report to the console will be printed
 252 dnl # if memory was leaked.  Additionally, /proc/spl/kmem/slab will exist
 253 dnl # and provide an easy way to inspect the kmem based slab.
 254 dnl #
 255 AC_DEFUN([SPL_AC_DEBUG_KMEM], [
 256         AC_ARG_ENABLE([debug-kmem],
 257                 [AS_HELP_STRING([--enable-debug-kmem],
 258                 [Enable basic kmem accounting @<:@default=yes@:>@])],
 259                 [],
 260                 [enable_debug_kmem=yes])
 261
 262         AS_IF([test "x$enable_debug_kmem" = xyes],
 263                 [AC_DEFINE([DEBUG_KMEM], [1],
 264                 [Define to 1 to enable basic kmem accounting])
 265                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM"])
 266
 267         AC_MSG_CHECKING([whether basic kmem accounting is enabled])
 268         AC_MSG_RESULT([$enable_debug_kmem])
 269 ])
 270
 271 dnl #
 272 dnl # Disabled by default it provides detailed memory tracking.  This
 273 dnl # feature also requires --enable-debug-kmem to be set.  When enabled
 274 dnl # not only will total bytes be tracked but also the location of every
 275 dnl # alloc and free.  When the SPL module is unloaded a list of all leaked
 276 dnl # addresses and where they were allocated will be dumped to the console.
 277 dnl # Enabling this feature has a significant impact on performance but it
 278 dnl # makes finding memory leaks pretty straight forward.
 279 dnl #
 280 AC_DEFUN([SPL_AC_DEBUG_KMEM_TRACKING], [
 281         AC_ARG_ENABLE([debug-kmem-tracking],
 282                 [AS_HELP_STRING([--enable-debug-kmem-tracking],
 283                 [Enable detailed kmem tracking  @<:@default=no@:>@])],
 284                 [],
 285                 [enable_debug_kmem_tracking=no])
 286
 287         AS_IF([test "x$enable_debug_kmem_tracking" = xyes],
 288                 [AC_DEFINE([DEBUG_KMEM_TRACKING], [1],
 289                 [Define to 1 to enable detailed kmem tracking])
 290                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM_TRACKING"])
 291
 292         AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
 293         AC_MSG_RESULT([$enable_debug_kmem_tracking])
 294 ])
 295
 296 dnl #
 297 dnl # SPL_LINUX_CONFTEST
 298 dnl #
 299 AC_DEFUN([SPL_LINUX_CONFTEST], [
 300 cat >conftest.c <<_ACEOF
 301 $1
 302 _ACEOF
 303 ])
 304
 305 dnl #
 306 dnl # SPL_LANG_PROGRAM(C)([PROLOGUE], [BODY])
 307 dnl #
 308 m4_define([SPL_LANG_PROGRAM], [
 309 $1
 310 int
 311 main (void)
 312 {
 313 dnl Do *not* indent the following line: there may be CPP directives.
 314 dnl Don't move the `;' right after for the same reason.
 315 $2
 316   ;
 317   return 0;
 318 }
 319 ])
 320
 321 dnl #
 322 dnl # SPL_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
 323 dnl #
 324 AC_DEFUN([SPL_LINUX_COMPILE_IFELSE], [
 325         m4_ifvaln([$1], [SPL_LINUX_CONFTEST([$1])])
 326         rm -Rf build && mkdir -p build
 327         echo "obj-m := conftest.o" >build/Makefile
 328         AS_IF(
 329                 [AC_TRY_COMMAND(cp conftest.c build && make [$2] -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build) >/dev/null && AC_TRY_COMMAND([$3])],
 330                 [$4],
 331                 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
 332         )
 333         rm -Rf build
 334 ])
 335
 336 dnl #
 337 dnl # SPL_LINUX_TRY_COMPILE like AC_TRY_COMPILE
 338 dnl #
 339 AC_DEFUN([SPL_LINUX_TRY_COMPILE],
 340         [SPL_LINUX_COMPILE_IFELSE(
 341         [AC_LANG_SOURCE([SPL_LANG_PROGRAM([[$1]], [[$2]])])],
 342         [modules],
 343         [test -s build/conftest.o],
 344         [$3], [$4])
 345 ])
 346
 347 dnl #
 348 dnl # SPL_LINUX_CONFIG
 349 dnl #
 350 AC_DEFUN([SPL_LINUX_CONFIG],
 351         [AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
 352         SPL_LINUX_TRY_COMPILE([
 353                 #ifndef AUTOCONF_INCLUDED
 354                 #include <linux/config.h>
 355                 #endif
 356         ],[
 357                 #ifndef CONFIG_$1
 358                 #error CONFIG_$1 not #defined
 359                 #endif
 360         ],[
 361                 AC_MSG_RESULT([yes])
 362                 $2
 363         ],[
 364                 AC_MSG_RESULT([no])
 365                 $3
 366         ])
 367 ])
 368
 369 dnl #
 370 dnl # SPL_CHECK_SYMBOL_EXPORT
 371 dnl # check symbol exported or not
 372 dnl #
 373 AC_DEFUN([SPL_CHECK_SYMBOL_EXPORT],
 374         [AC_MSG_CHECKING([whether symbol $1 is exported])
 375         grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
 376                 $LINUX_OBJ/Module*.symvers 2>/dev/null
 377         rc=$?
 378         if test $rc -ne 0; then
 379                 export=0
 380                 for file in $2; do
 381                         grep -q -E "EXPORT_SYMBOL.*($1)" \
 382                                 "$LINUX_OBJ/$file" 2>/dev/null
 383                         rc=$?
 384                         if test $rc -eq 0; then
 385                                 export=1
 386                                 break;
 387                         fi
 388                 done
 389                 if test $export -eq 0; then
 390                         AC_MSG_RESULT([no])
 391                         $4
 392                 else
 393                         AC_MSG_RESULT([yes])
 394                         $3
 395                 fi
 396         else
 397                 AC_MSG_RESULT([yes])
 398                 $3
 399         fi
 400 ])
 401
 402 dnl #
 403 dnl # SPL_CHECK_HEADER
 404 dnl # check whether header exists and define HAVE_$2_HEADER
 405 dnl #
 406 AC_DEFUN([SPL_CHECK_HEADER],
 407         [AC_MSG_CHECKING([whether header $1 exists])
 408         SPL_LINUX_TRY_COMPILE([
 409                 #include <$1>
 410         ],[
 411                 return 0;
 412         ],[
 413                 AC_DEFINE(HAVE_$2_HEADER, 1, [$1 exists])
 414                 AC_MSG_RESULT(yes)
 415                 $3
 416         ],[
 417                 AC_MSG_RESULT(no)
 418                 $4
 419         ])
 420 ])
 421
 422 dnl #
 423 dnl # Use the atomic implemenation based on global spinlocks.  This
 424 dnl # should only be needed by 32-bit kernels which do not provide
 425 dnl # the atomic64_* API.  It may be optionally enabled as a fallback
 426 dnl # if problems are observed with the direct mapping to the native
 427 dnl # Linux atomic operations.  You may not disable atomic spinlocks
 428 dnl # if you kernel does not an atomic64_* API.
 429 dnl #
 430 AC_DEFUN([SPL_AC_ATOMIC_SPINLOCK], [
 431         AC_ARG_ENABLE([atomic-spinlocks],
 432                 [AS_HELP_STRING([--enable-atomic-spinlocks],
 433                 [Atomic types use spinlocks @<:@default=check@:>@])],
 434                 [],
 435                 [enable_atomic_spinlocks=check])
 436
 437         SPL_LINUX_TRY_COMPILE([
 438                 #include <asm/atomic.h>
 439         ],[
 440                 atomic64_t *ptr;
 441         ],[
 442                 have_atomic64_t=yes
 443                 AC_DEFINE(HAVE_ATOMIC64_T, 1,
 444                         [kernel defines atomic64_t])
 445         ],[
 446                 have_atomic64_t=no
 447         ])
 448
 449         AS_IF([test "x$enable_atomic_spinlocks" = xcheck], [
 450                 AS_IF([test "x$have_atomic64_t" = xyes], [
 451                         enable_atomic_spinlocks=no
 452                 ],[
 453                         enable_atomic_spinlocks=yes
 454                 ])
 455         ])
 456
 457         AS_IF([test "x$enable_atomic_spinlocks" = xyes], [
 458                 AC_DEFINE([ATOMIC_SPINLOCK], [1],
 459                         [Atomic types use spinlocks])
 460         ],[
 461                 AS_IF([test "x$have_atomic64_t" = xno], [
 462                         AC_MSG_FAILURE(
 463                         [--disable-atomic-spinlocks given but required atomic64 support is unavailable])
 464                 ])
 465         ])
 466
 467         AC_MSG_CHECKING([whether atomic types use spinlocks])
 468         AC_MSG_RESULT([$enable_atomic_spinlocks])
 469
 470         AC_MSG_CHECKING([whether kernel defines atomic64_t])
 471         AC_MSG_RESULT([$have_atomic64_t])
 472 ])
 473
 474 dnl #
 475 dnl # 2.6.24 API change,
 476 dnl # check if atomic64_cmpxchg is defined
 477 dnl #
 478 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_CMPXCHG],
 479         [AC_MSG_CHECKING([whether kernel defines atomic64_cmpxchg])
 480         SPL_LINUX_TRY_COMPILE([
 481                 #include <asm/atomic.h>
 482         ],[
 483                 atomic64_cmpxchg((atomic64_t *)NULL, 0, 0);
 484         ],[
 485                 AC_MSG_RESULT([yes])
 486                 AC_DEFINE(HAVE_ATOMIC64_CMPXCHG, 1,
 487                           [kernel defines atomic64_cmpxchg])
 488         ],[
 489                 AC_MSG_RESULT([no])
 490         ])
 491 ])
 492
 493 dnl #
 494 dnl # 2.6.24 API change,
 495 dnl # check if atomic64_xchg is defined
 496 dnl #
 497 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_XCHG],
 498         [AC_MSG_CHECKING([whether kernel defines atomic64_xchg])
 499         SPL_LINUX_TRY_COMPILE([
 500                 #include <asm/atomic.h>
 501         ],[
 502                 atomic64_xchg((atomic64_t *)NULL, 0);
 503         ],[
 504                 AC_MSG_RESULT([yes])
 505                 AC_DEFINE(HAVE_ATOMIC64_XCHG, 1,
 506                           [kernel defines atomic64_xchg])
 507         ],[
 508                 AC_MSG_RESULT([no])
 509         ])
 510 ])
 511
 512 dnl #
 513 dnl # 2.6.24 API change,
 514 dnl # check if uintptr_t typedef is defined
 515 dnl #
 516 AC_DEFUN([SPL_AC_TYPE_UINTPTR_T],
 517         [AC_MSG_CHECKING([whether kernel defines uintptr_t])
 518         SPL_LINUX_TRY_COMPILE([
 519                 #include <linux/types.h>
 520         ],[
 521                 uintptr_t *ptr;
 522         ],[
 523                 AC_MSG_RESULT([yes])
 524                 AC_DEFINE(HAVE_UINTPTR_T, 1,
 525                           [kernel defines uintptr_t])
 526         ],[
 527                 AC_MSG_RESULT([no])
 528         ])
 529 ])
 530
 531 dnl #
 532 dnl # 2.6.20 API change,
 533 dnl # INIT_WORK use 2 args and not store data inside
 534 dnl #
 535 AC_DEFUN([SPL_AC_3ARGS_INIT_WORK],
 536         [AC_MSG_CHECKING([whether INIT_WORK wants 3 args])
 537         SPL_LINUX_TRY_COMPILE([
 538                 #include <linux/workqueue.h>
 539         ],[
 540                 struct work_struct work;
 541                 INIT_WORK(&work, NULL, NULL);
 542         ],[
 543                 AC_MSG_RESULT(yes)
 544                 AC_DEFINE(HAVE_3ARGS_INIT_WORK, 1,
 545                           [INIT_WORK wants 3 args])
 546         ],[
 547                 AC_MSG_RESULT(no)
 548         ])
 549 ])
 550
 551 dnl #
 552 dnl # 2.6.21 API change,
 553 dnl # 'register_sysctl_table' use only one argument instead of two
 554 dnl #
 555 AC_DEFUN([SPL_AC_2ARGS_REGISTER_SYSCTL],
 556         [AC_MSG_CHECKING([whether register_sysctl_table() wants 2 args])
 557         SPL_LINUX_TRY_COMPILE([
 558                 #include <linux/sysctl.h>
 559         ],[
 560                 return register_sysctl_table(NULL,0);
 561         ],[
 562                 AC_MSG_RESULT(yes)
 563                 AC_DEFINE(HAVE_2ARGS_REGISTER_SYSCTL, 1,
 564                           [register_sysctl_table() wants 2 args])
 565         ],[
 566                 AC_MSG_RESULT(no)
 567         ])
 568 ])
 569
 570 dnl #
 571 dnl # 2.6.23 API change
 572 dnl # Old set_shrinker API replaced with register_shrinker
 573 dnl #
 574 AC_DEFUN([SPL_AC_SET_SHRINKER], [
 575         AC_MSG_CHECKING([whether set_shrinker() available])
 576         SPL_LINUX_TRY_COMPILE([
 577                 #include <linux/mm.h>
 578         ],[
 579                 return set_shrinker(DEFAULT_SEEKS, NULL);
 580         ],[
 581                 AC_MSG_RESULT([yes])
 582                 AC_DEFINE(HAVE_SET_SHRINKER, 1,
 583                           [set_shrinker() available])
 584         ],[
 585                 AC_MSG_RESULT([no])
 586         ])
 587 ])
 588
 589 dnl #
 590 dnl # 2.6.25 API change,
 591 dnl # struct path entry added to struct nameidata
 592 dnl #
 593 AC_DEFUN([SPL_AC_PATH_IN_NAMEIDATA],
 594         [AC_MSG_CHECKING([whether struct path used in struct nameidata])
 595         SPL_LINUX_TRY_COMPILE([
 596                 #include <linux/namei.h>
 597         ],[
 598                 struct nameidata nd;
 599
 600                 nd.path.mnt = NULL;
 601                 nd.path.dentry = NULL;
 602         ],[
 603                 AC_MSG_RESULT(yes)
 604                 AC_DEFINE(HAVE_PATH_IN_NAMEIDATA, 1,
 605                           [struct path used in struct nameidata])
 606         ],[
 607                 AC_MSG_RESULT(no)
 608         ])
 609 ])
 610
 611 dnl #
 612 dnl # Custom SPL patch may export this system it is not required
 613 dnl #
 614 AC_DEFUN([SPL_AC_TASK_CURR], [
 615         SPL_CHECK_SYMBOL_EXPORT([task_curr], [kernel/sched.c],
 616                 [AC_DEFINE(HAVE_TASK_CURR, 1, [task_curr() exported])],
 617                 [])
 618 ])
 619
 620 dnl #
 621 dnl # 2.6.19 API change,
 622 dnl # Use CTL_UNNUMBERED when binary sysctl is not required
 623 dnl #
 624 AC_DEFUN([SPL_AC_CTL_UNNUMBERED],
 625         [AC_MSG_CHECKING([whether unnumbered sysctl support exists])
 626         SPL_LINUX_TRY_COMPILE([
 627                 #include <linux/sysctl.h>
 628         ],[
 629                 #ifndef CTL_UNNUMBERED
 630                 #error CTL_UNNUMBERED undefined
 631                 #endif
 632         ],[
 633                 AC_MSG_RESULT(yes)
 634                 AC_DEFINE(HAVE_CTL_UNNUMBERED, 1,
 635                           [unnumbered sysctl support exists])
 636         ],[
 637                 AC_MSG_RESULT(no)
 638         ])
 639 ])
 640
 641 dnl #
 642 dnl # 2.6.16 API change.
 643 dnl # Check if 'fls64()' is available
 644 dnl #
 645 AC_DEFUN([SPL_AC_FLS64],
 646         [AC_MSG_CHECKING([whether fls64() is available])
 647         SPL_LINUX_TRY_COMPILE([
 648                 #include <linux/bitops.h>
 649         ],[
 650                 return fls64(0);
 651         ],[
 652                 AC_MSG_RESULT(yes)
 653                 AC_DEFINE(HAVE_FLS64, 1, [fls64() is available])
 654         ],[
 655                 AC_MSG_RESULT(no)
 656         ])
 657 ])
 658
 659 dnl #
 660 dnl # 2.6.18 API change, check whether device_create() is available.
 661 dnl # Device_create() was introduced in 2.6.18 and depricated
 662 dnl # class_device_create() which was fully removed in 2.6.26.
 663 dnl #
 664 AC_DEFUN([SPL_AC_DEVICE_CREATE], [
 665         SPL_CHECK_SYMBOL_EXPORT(
 666                 [device_create],
 667                 [drivers/base/core.c],
 668                 [AC_DEFINE(HAVE_DEVICE_CREATE, 1,
 669                 [device_create() is available])],
 670                 [])
 671 ])
 672
 673 dnl #
 674 dnl # 2.6.27 API change,
 675 dnl # device_create() uses 5 args, new 'drvdata' argument.
 676 dnl #
 677 AC_DEFUN([SPL_AC_5ARGS_DEVICE_CREATE], [
 678         AC_MSG_CHECKING([whether device_create() wants 5 args])
 679         tmp_flags="$EXTRA_KCFLAGS"
 680         EXTRA_KCFLAGS="-Werror"
 681         SPL_LINUX_TRY_COMPILE([
 682                 #include <linux/device.h>
 683         ],[
 684                 device_create(NULL, NULL, 0, NULL, "%d", 1);
 685         ],[
 686                 AC_MSG_RESULT(yes)
 687                 AC_DEFINE(HAVE_5ARGS_DEVICE_CREATE, 1,
 688                           [device_create wants 5 args])
 689         ],[
 690                 AC_MSG_RESULT(no)
 691         ])
 692         EXTRA_KCFLAGS="$tmp_flags"
 693 ])
 694
 695 dnl #
 696 dnl # 2.6.13 API change, check whether class_device_create() is available.
 697 dnl # Class_device_create() was introduced in 2.6.13 and depricated
 698 dnl # class_simple_device_add() which was fully removed in 2.6.13.
 699 dnl #
 700 AC_DEFUN([SPL_AC_CLASS_DEVICE_CREATE], [
 701         SPL_CHECK_SYMBOL_EXPORT(
 702                 [class_device_create],
 703                 [drivers/base/class.c],
 704                 [AC_DEFINE(HAVE_CLASS_DEVICE_CREATE, 1,
 705                 [class_device_create() is available])],
 706                 [])
 707 ])
 708
 709 dnl #
 710 dnl # 2.6.26 API change, set_normalized_timespec() is exported.
 711 dnl #
 712 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT], [
 713         SPL_CHECK_SYMBOL_EXPORT(
 714                 [set_normalized_timespec],
 715                 [kernel/time.c],
 716                 [AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_EXPORT, 1,
 717                 [set_normalized_timespec() is available as export])],
 718                 [])
 719 ])
 720
 721 dnl #
 722 dnl # 2.6.16 API change, set_normalize_timespec() moved to time.c
 723 dnl # previously it was available in time.h as an inline.
 724 dnl #
 725 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE], [
 726         AC_MSG_CHECKING([whether set_normalized_timespec() is an inline])
 727         SPL_LINUX_TRY_COMPILE([
 728                 #include <linux/time.h>
 729                 void set_normalized_timespec(struct timespec *ts,
 730                                              time_t sec, long nsec) { }
 731         ],
 732         [],
 733         [
 734                 AC_MSG_RESULT(no)
 735         ],[
 736                 AC_MSG_RESULT(yes)
 737                 AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_INLINE, 1,
 738                           [set_normalized_timespec() is available as inline])
 739         ])
 740 ])
 741
 742 dnl #
 743 dnl # 2.6.18 API change,
 744 dnl # timespec_sub() inline function available in linux/time.h
 745 dnl #
 746 AC_DEFUN([SPL_AC_TIMESPEC_SUB], [
 747         AC_MSG_CHECKING([whether timespec_sub() is available])
 748         SPL_LINUX_TRY_COMPILE([
 749                 #include <linux/time.h>
 750         ],[
 751                 struct timespec a, b, c = { 0 };
 752                 c = timespec_sub(a, b);
 753         ],[
 754                 AC_MSG_RESULT(yes)
 755                 AC_DEFINE(HAVE_TIMESPEC_SUB, 1, [timespec_sub() is available])
 756         ],[
 757                 AC_MSG_RESULT(no)
 758         ])
 759 ])
 760
 761 dnl #
 762 dnl # 2.6.19 API change,
 763 dnl # check if init_utsname() is available in linux/utsname.h
 764 dnl #
 765 AC_DEFUN([SPL_AC_INIT_UTSNAME], [
 766         AC_MSG_CHECKING([whether init_utsname() is available])
 767         SPL_LINUX_TRY_COMPILE([
 768                 #include <linux/utsname.h>
 769         ],[
 770                 struct new_utsname *a = init_utsname();
 771         ],[
 772                 AC_MSG_RESULT(yes)
 773                 AC_DEFINE(HAVE_INIT_UTSNAME, 1, [init_utsname() is available])
 774         ],[
 775                 AC_MSG_RESULT(no)
 776         ])
 777 ])
 778
 779 dnl #
 780 dnl # 2.6.26 API change,
 781 dnl # definition of struct fdtable relocated to linux/fdtable.h
 782 dnl #
 783 AC_DEFUN([SPL_AC_FDTABLE_HEADER], [
 784         SPL_CHECK_HEADER([linux/fdtable.h], [FDTABLE], [], [])
 785 ])
 786
 787 dnl #
 788 dnl # 2.6.14 API change,
 789 dnl # check whether 'files_fdtable()' exists
 790 dnl #
 791 AC_DEFUN([SPL_AC_FILES_FDTABLE], [
 792         AC_MSG_CHECKING([whether files_fdtable() is available])
 793         SPL_LINUX_TRY_COMPILE([
 794                 #include <linux/sched.h>
 795                 #include <linux/file.h>
 796                 #ifdef HAVE_FDTABLE_HEADER
 797                 #include <linux/fdtable.h>
 798                 #endif
 799         ],[
 800                 struct files_struct *files = current->files;
 801                 struct fdtable *fdt = files_fdtable(files);
 802         ],[
 803                 AC_MSG_RESULT(yes)
 804                 AC_DEFINE(HAVE_FILES_FDTABLE, 1, [files_fdtable() is available])
 805         ],[
 806                 AC_MSG_RESULT(no)
 807         ])
 808 ])
 809
 810 dnl #
 811 dnl # 2.6.18 API change,
 812 dnl # added linux/uaccess.h
 813 dnl #
 814 AC_DEFUN([SPL_AC_UACCESS_HEADER], [
 815         SPL_CHECK_HEADER([linux/uaccess.h], [UACCESS], [], [])
 816 ])
 817
 818 dnl #
 819 dnl # 2.6.12 API change,
 820 dnl # check whether 'kmalloc_node()' is available.
 821 dnl #
 822 AC_DEFUN([SPL_AC_KMALLOC_NODE], [
 823         AC_MSG_CHECKING([whether kmalloc_node() is available])
 824         SPL_LINUX_TRY_COMPILE([
 825                 #include <linux/slab.h>
 826         ],[
 827                 void *a = kmalloc_node(1, GFP_KERNEL, 0);
 828         ],[
 829                 AC_MSG_RESULT(yes)
 830                 AC_DEFINE(HAVE_KMALLOC_NODE, 1, [kmalloc_node() is available])
 831         ],[
 832                 AC_MSG_RESULT(no)
 833         ])
 834 ])
 835
 836 dnl #
 837 dnl # 2.6.9 API change,
 838 dnl # check whether 'monotonic_clock()' is available it may
 839 dnl # be available for some archs but not others.
 840 dnl #
 841 AC_DEFUN([SPL_AC_MONOTONIC_CLOCK], [
 842         SPL_CHECK_SYMBOL_EXPORT(
 843                 [monotonic_clock],
 844                 [],
 845                 [AC_DEFINE(HAVE_MONOTONIC_CLOCK, 1,
 846                 [monotonic_clock() is available])],
 847                 [])
 848 ])
 849
 850 dnl #
 851 dnl # 2.6.16 API change,
 852 dnl # check whether 'struct inode' has i_mutex
 853 dnl #
 854 AC_DEFUN([SPL_AC_INODE_I_MUTEX], [
 855         AC_MSG_CHECKING([whether struct inode has i_mutex])
 856         SPL_LINUX_TRY_COMPILE([
 857                 #include <linux/fs.h>
 858                 #include <linux/mutex.h>
 859         ],[
 860                 struct inode i;
 861                 mutex_init(&i.i_mutex);
 862         ],[
 863                 AC_MSG_RESULT(yes)
 864                 AC_DEFINE(HAVE_INODE_I_MUTEX, 1, [struct inode has i_mutex])
 865         ],[
 866                 AC_MSG_RESULT(no)
 867         ])
 868 ])
 869
 870 dnl #
 871 dnl # 2.6.29 API change,
 872 dnl # Adaptive mutexs introduced.
 873 dnl #
 874 AC_DEFUN([SPL_AC_MUTEX_OWNER], [
 875         AC_MSG_CHECKING([whether struct mutex has owner])
 876         SPL_LINUX_TRY_COMPILE([
 877                 #include <linux/mutex.h>
 878         ],[
 879                 struct mutex mtx;
 880                 mtx.owner = NULL;
 881         ],[
 882                 AC_MSG_RESULT(yes)
 883                 AC_DEFINE(HAVE_MUTEX_OWNER, 1, [struct mutex has owner])
 884         ],[
 885                 AC_MSG_RESULT(no)
 886         ])
 887 ])
 888
 889 dnl #
 890 dnl # 2.6.18 API change,
 891 dnl # First introduced 'mutex_lock_nested()' in include/linux/mutex.h,
 892 dnl # as part of the mutex validator.  Fallback to using 'mutex_lock()'
 893 dnl # if the mutex validator is disabled or otherwise unavailable.
 894 dnl #
 895 AC_DEFUN([SPL_AC_MUTEX_LOCK_NESTED], [
 896         AC_MSG_CHECKING([whether mutex_lock_nested() is available])
 897         SPL_LINUX_TRY_COMPILE([
 898                 #include <linux/mutex.h>
 899         ],[
 900                 struct mutex mutex;
 901                 mutex_init(&mutex);
 902                 mutex_lock_nested(&mutex, 0);
 903         ],[
 904                 AC_MSG_RESULT(yes)
 905                 AC_DEFINE(HAVE_MUTEX_LOCK_NESTED, 1,
 906                 [mutex_lock_nested() is available])
 907         ],[
 908                 AC_MSG_RESULT(no)
 909         ])
 910 ])
 911
 912 dnl #
 913 dnl # 2.6.22 API change,
 914 dnl # First introduced 'div64_64()' in lib/div64.c
 915 dnl
 916 AC_DEFUN([SPL_AC_DIV64_64], [
 917         SPL_CHECK_SYMBOL_EXPORT(
 918                 [div64_64],
 919                 [],
 920                 [AC_DEFINE(HAVE_DIV64_64, 1,
 921                 [div64_64() is available])],
 922                 [])
 923 ])
 924
 925 dnl #
 926 dnl # 2.6.26 API change,
 927 dnl # Renamed 'div64_64()' to 'div64_u64' in lib/div64.c
 928 dnl #
 929 AC_DEFUN([SPL_AC_DIV64_U64], [
 930         SPL_CHECK_SYMBOL_EXPORT(
 931                 [div64_u64],
 932                 [],
 933                 [AC_DEFINE(HAVE_DIV64_U64, 1,
 934                 [div64_u64() is available])],
 935                 [])
 936 ])
 937
 938 dnl #
 939 dnl # 2.6.27 API change,
 940 dnl # on_each_cpu() uses 3 args, no 'retry' argument
 941 dnl #
 942 AC_DEFUN([SPL_AC_3ARGS_ON_EACH_CPU], [
 943         AC_MSG_CHECKING([whether on_each_cpu() wants 3 args])
 944         SPL_LINUX_TRY_COMPILE([
 945                 #include <linux/smp.h>
 946         ],[
 947                 on_each_cpu(NULL, NULL, 0);
 948         ],[
 949                 AC_MSG_RESULT(yes)
 950                 AC_DEFINE(HAVE_3ARGS_ON_EACH_CPU, 1,
 951                           [on_each_cpu wants 3 args])
 952         ],[
 953                 AC_MSG_RESULT(no)
 954         ])
 955 ])
 956
 957 dnl #
 958 dnl # 2.6.18 API change,
 959 dnl # kallsyms_lookup_name no longer exported
 960 dnl #
 961 AC_DEFUN([SPL_AC_KALLSYMS_LOOKUP_NAME], [
 962         SPL_CHECK_SYMBOL_EXPORT(
 963                 [kallsyms_lookup_name],
 964                 [],
 965                 [AC_DEFINE(HAVE_KALLSYMS_LOOKUP_NAME, 1,
 966                 [kallsyms_lookup_name() is available])],
 967                 [])
 968 ])
 969
 970 dnl #
 971 dnl # Proposed API change,
 972 dnl # This symbol is not available in stock kernels.  You may build a
 973 dnl # custom kernel with the *-spl-export-symbols.patch which will export
 974 dnl # these symbols for use.  If your already rolling a custom kernel for
 975 dnl # your environment this is recommended.
 976 dnl #
 977 AC_DEFUN([SPL_AC_GET_VMALLOC_INFO], [
 978         SPL_CHECK_SYMBOL_EXPORT(
 979                 [get_vmalloc_info],
 980                 [],
 981                 [AC_DEFINE(HAVE_GET_VMALLOC_INFO, 1,
 982                 [get_vmalloc_info() is available])],
 983                 [])
 984 ])
 985
 986 dnl #
 987 dnl # 2.6.17 API change
 988 dnl # The helper functions first_online_pgdat(), next_online_pgdat(), and
 989 dnl # next_zone() are introduced to simplify for_each_zone().  These symbols
 990 dnl # were exported in 2.6.17 for use by modules which was consistent with
 991 dnl # the previous implementation of for_each_zone().  From 2.6.18 - 2.6.19
 992 dnl # the symbols were exported as 'unused', and by 2.6.20 they exports
 993 dnl # were dropped entirely leaving modules no way to directly iterate over
 994 dnl # the zone list.  Because we need access to the zone helpers we check
 995 dnl # if the kernel contains the old or new implementation.  Then we check
 996 dnl # to see if the symbols we need for each version are available.  If they
 997 dnl # are not, dynamically aquire the addresses with kallsyms_lookup_name().
 998 dnl #
 999 AC_DEFUN([SPL_AC_PGDAT_HELPERS], [
1000         AC_MSG_CHECKING([whether symbol *_pgdat exist])
1001         grep -q -E 'first_online_pgdat' $LINUX/include/linux/mmzone.h 2>/dev/null
1002         rc=$?
1003         if test $rc -eq 0; then
1004                 AC_MSG_RESULT([yes])
1005                 AC_DEFINE(HAVE_PGDAT_HELPERS, 1, [pgdat helpers are available])
1006         else
1007                 AC_MSG_RESULT([no])
1008         fi
1009 ])
1010
1011 dnl #
1012 dnl # Proposed API change,
1013 dnl # This symbol is not available in stock kernels.  You may build a
1014 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1015 dnl # these symbols for use.  If your already rolling a custom kernel for
1016 dnl # your environment this is recommended.
1017 dnl #
1018 AC_DEFUN([SPL_AC_FIRST_ONLINE_PGDAT], [
1019         SPL_CHECK_SYMBOL_EXPORT(
1020                 [first_online_pgdat],
1021                 [],
1022                 [AC_DEFINE(HAVE_FIRST_ONLINE_PGDAT, 1,
1023                 [first_online_pgdat() is available])],
1024                 [])
1025 ])
1026
1027 dnl #
1028 dnl # Proposed API change,
1029 dnl # This symbol is not available in stock kernels.  You may build a
1030 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1031 dnl # these symbols for use.  If your already rolling a custom kernel for
1032 dnl # your environment this is recommended.
1033 dnl #
1034 AC_DEFUN([SPL_AC_NEXT_ONLINE_PGDAT], [
1035         SPL_CHECK_SYMBOL_EXPORT(
1036                 [next_online_pgdat],
1037                 [],
1038                 [AC_DEFINE(HAVE_NEXT_ONLINE_PGDAT, 1,
1039                 [next_online_pgdat() is available])],
1040                 [])
1041 ])
1042
1043 dnl #
1044 dnl # Proposed API change,
1045 dnl # This symbol is not available in stock kernels.  You may build a
1046 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1047 dnl # these symbols for use.  If your already rolling a custom kernel for
1048 dnl # your environment this is recommended.
1049 dnl #
1050 AC_DEFUN([SPL_AC_NEXT_ZONE], [
1051         SPL_CHECK_SYMBOL_EXPORT(
1052                 [next_zone],
1053                 [],
1054                 [AC_DEFINE(HAVE_NEXT_ZONE, 1,
1055                 [next_zone() is available])],
1056                 [])
1057 ])
1058
1059 dnl #
1060 dnl # 2.6.17 API change,
1061 dnl # See SPL_AC_PGDAT_HELPERS for details.
1062 dnl #
1063 AC_DEFUN([SPL_AC_PGDAT_LIST], [
1064         SPL_CHECK_SYMBOL_EXPORT(
1065                 [pgdat_list],
1066                 [],
1067                 [AC_DEFINE(HAVE_PGDAT_LIST, 1,
1068                 [pgdat_list is available])],
1069                 [])
1070 ])
1071
1072 dnl #
1073 dnl # 2.6.18 API change,
1074 dnl # First introduced global_page_state() support as an inline.
1075 dnl #
1076 AC_DEFUN([SPL_AC_GLOBAL_PAGE_STATE], [
1077         AC_MSG_CHECKING([whether global_page_state() is available])
1078         SPL_LINUX_TRY_COMPILE([
1079                 #include <linux/mm.h>
1080         ],[
1081                 unsigned long state;
1082                 state = global_page_state(0);
1083         ],[
1084                 AC_MSG_RESULT(yes)
1085                 AC_DEFINE(HAVE_GLOBAL_PAGE_STATE, 1,
1086                           [global_page_state() is available])
1087         ],[
1088                 AC_MSG_RESULT(no)
1089         ])
1090 ])
1091
1092 dnl #
1093 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1094 dnl # Public global zone stats now include a free page count.  However
1095 dnl # the enumerated names of the counters have changed since this API
1096 dnl # was introduced.  We need to deduce the corrent name to use.  This
1097 dnl # replaces the priviate get_zone_counts() interface.
1098 dnl #
1099 dnl # NR_FREE_PAGES was available from 2.6.21 to current kernels, which
1100 dnl # is 2.6.30 as of when this was written.
1101 dnl #
1102 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_FREE], [
1103         AC_MSG_CHECKING([whether page state NR_FREE_PAGES is available])
1104         SPL_LINUX_TRY_COMPILE([
1105                 #include <linux/mm.h>
1106         ],[
1107                 enum zone_stat_item zsi;
1108                 zsi = NR_FREE_PAGES;
1109         ],[
1110                 AC_MSG_RESULT(yes)
1111                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES, 1,
1112                           [Page state NR_FREE_PAGES is available])
1113         ],[
1114                 AC_MSG_RESULT(no)
1115         ])
1116 ])
1117
1118 dnl #
1119 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1120 dnl # Public global zone stats now include an inactive page count.  However
1121 dnl # the enumerated names of the counters have changed since this API
1122 dnl # was introduced.  We need to deduce the corrent name to use.  This
1123 dnl # replaces the priviate get_zone_counts() interface.
1124 dnl #
1125 dnl # NR_INACTIVE was available from 2.6.21 to 2.6.27 and included both
1126 dnl # anonymous and file inactive pages.  As of 2.6.28 it was split in
1127 dnl # to NR_INACTIVE_ANON and NR_INACTIVE_FILE.
1128 dnl #
1129 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_INACTIVE], [
1130         AC_MSG_CHECKING([whether page state NR_INACTIVE is available])
1131         SPL_LINUX_TRY_COMPILE([
1132                 #include <linux/mm.h>
1133         ],[
1134                 enum zone_stat_item zsi;
1135                 zsi = NR_INACTIVE;
1136         ],[
1137                 AC_MSG_RESULT(yes)
1138                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE, 1,
1139                           [Page state NR_INACTIVE is available])
1140         ],[
1141                 AC_MSG_RESULT(no)
1142         ])
1143
1144         AC_MSG_CHECKING([whether page state NR_INACTIVE_ANON is available])
1145         SPL_LINUX_TRY_COMPILE([
1146                 #include <linux/mm.h>
1147         ],[
1148                 enum zone_stat_item zsi;
1149                 zsi = NR_INACTIVE_ANON;
1150         ],[
1151                 AC_MSG_RESULT(yes)
1152                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON, 1,
1153                           [Page state NR_INACTIVE_ANON is available])
1154         ],[
1155                 AC_MSG_RESULT(no)
1156         ])
1157
1158         AC_MSG_CHECKING([whether page state NR_INACTIVE_FILE is available])
1159         SPL_LINUX_TRY_COMPILE([
1160                 #include <linux/mm.h>
1161         ],[
1162                 enum zone_stat_item zsi;
1163                 zsi = NR_INACTIVE_FILE;
1164         ],[
1165                 AC_MSG_RESULT(yes)
1166                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE, 1,
1167                           [Page state NR_INACTIVE_FILE is available])
1168         ],[
1169                 AC_MSG_RESULT(no)
1170         ])
1171 ])
1172
1173 dnl #
1174 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1175 dnl # Public global zone stats now include an active page count.  However
1176 dnl # the enumerated names of the counters have changed since this API
1177 dnl # was introduced.  We need to deduce the corrent name to use.  This
1178 dnl # replaces the priviate get_zone_counts() interface.
1179 dnl #
1180 dnl # NR_ACTIVE was available from 2.6.21 to 2.6.27 and included both
1181 dnl # anonymous and file active pages.  As of 2.6.28 it was split in
1182 dnl # to NR_ACTIVE_ANON and NR_ACTIVE_FILE.
1183 dnl #
1184 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_ACTIVE], [
1185         AC_MSG_CHECKING([whether page state NR_ACTIVE is available])
1186         SPL_LINUX_TRY_COMPILE([
1187                 #include <linux/mm.h>
1188         ],[
1189                 enum zone_stat_item zsi;
1190                 zsi = NR_ACTIVE;
1191         ],[
1192                 AC_MSG_RESULT(yes)
1193                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE, 1,
1194                           [Page state NR_ACTIVE is available])
1195         ],[
1196                 AC_MSG_RESULT(no)
1197         ])
1198
1199         AC_MSG_CHECKING([whether page state NR_ACTIVE_ANON is available])
1200         SPL_LINUX_TRY_COMPILE([
1201                 #include <linux/mm.h>
1202         ],[
1203                 enum zone_stat_item zsi;
1204                 zsi = NR_ACTIVE_ANON;
1205         ],[
1206                 AC_MSG_RESULT(yes)
1207                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON, 1,
1208                           [Page state NR_ACTIVE_ANON is available])
1209         ],[
1210                 AC_MSG_RESULT(no)
1211         ])
1212
1213         AC_MSG_CHECKING([whether page state NR_ACTIVE_FILE is available])
1214         SPL_LINUX_TRY_COMPILE([
1215                 #include <linux/mm.h>
1216         ],[
1217                 enum zone_stat_item zsi;
1218                 zsi = NR_ACTIVE_FILE;
1219         ],[
1220                 AC_MSG_RESULT(yes)
1221                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE, 1,
1222                           [Page state NR_ACTIVE_FILE is available])
1223         ],[
1224                 AC_MSG_RESULT(no)
1225         ])
1226 ])
1227
1228 dnl #
1229 dnl # Proposed API change for legacy kernels.
1230 dnl # This symbol is not available in older kernels.  For kernels post
1231 dnl # 2.6.21 the global_page_state() API is used to get free/inactive/active
1232 dnl # page state information.  This symbol is only used in legacy kernels
1233 dnl # any only as a last resort.
1234 dnl
1235 AC_DEFUN([SPL_AC_GET_ZONE_COUNTS], [
1236         AC_MSG_CHECKING([whether symbol get_zone_counts is needed])
1237         SPL_LINUX_TRY_COMPILE([
1238         ],[
1239                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES)
1240                 #error "global_page_state needs NR_FREE_PAGES"
1241                 #endif
1242
1243                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE) && \
1244                     !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON) && \
1245                     !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE)
1246                 #error "global_page_state needs NR_ACTIVE*"
1247                 #endif
1248
1249                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE) && \
1250                     !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON) && \
1251                     !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE)
1252                 #error "global_page_state needs NR_INACTIVE*"
1253                 #endif
1254         ],[
1255                 AC_MSG_RESULT(no)
1256         ],[
1257                 AC_MSG_RESULT(yes)
1258                 AC_DEFINE(NEED_GET_ZONE_COUNTS, 1,
1259                           [get_zone_counts() is needed])
1260
1261                 SPL_CHECK_SYMBOL_EXPORT(
1262                         [get_zone_counts],
1263                         [],
1264                         [AC_DEFINE(HAVE_GET_ZONE_COUNTS, 1,
1265                         [get_zone_counts() is available])],
1266                         [])
1267         ])
1268 ])
1269
1270 dnl #
1271 dnl # Symbol available in RHEL kernels not in stock kernels.
1272 dnl #
1273 AC_DEFUN([SPL_AC_SET_FS_PWD], [
1274         SPL_CHECK_SYMBOL_EXPORT(
1275                 [set_fs_pwd],
1276                 [],
1277                 [AC_DEFINE(HAVE_SET_FS_PWD, 1,
1278                 [set_fs_pwd() is available])],
1279                 [])
1280 ])
1281
1282 dnl #
1283 dnl # 2.6.25 API change,
1284 dnl # Simplied API by replacing mnt+dentry args with a single path arg.
1285 dnl #
1286 AC_DEFUN([SPL_AC_2ARGS_SET_FS_PWD],
1287         [AC_MSG_CHECKING([whether set_fs_pwd() wants 2 args])
1288         SPL_LINUX_TRY_COMPILE([
1289                 #include <linux/sched.h>
1290                 #include <linux/fs_struct.h>
1291         ],[
1292                 set_fs_pwd(NULL, NULL);
1293         ],[
1294                 AC_MSG_RESULT(yes)
1295                 AC_DEFINE(HAVE_2ARGS_SET_FS_PWD, 1,
1296                           [set_fs_pwd() wants 2 args])
1297         ],[
1298                 AC_MSG_RESULT(no)
1299         ])
1300 ])
1301
1302 dnl #
1303 dnl # SLES API change, never adopted in mainline,
1304 dnl # Third 'struct vfsmount *' argument removed.
1305 dnl #
1306 AC_DEFUN([SPL_AC_2ARGS_VFS_UNLINK],
1307         [AC_MSG_CHECKING([whether vfs_unlink() wants 2 args])
1308         SPL_LINUX_TRY_COMPILE([
1309                 #include <linux/fs.h>
1310         ],[
1311                 vfs_unlink(NULL, NULL);
1312         ],[
1313                 AC_MSG_RESULT(yes)
1314                 AC_DEFINE(HAVE_2ARGS_VFS_UNLINK, 1,
1315                           [vfs_unlink() wants 2 args])
1316         ],[
1317                 AC_MSG_RESULT(no)
1318         ])
1319 ])
1320
1321 dnl #
1322 dnl # SLES API change, never adopted in mainline,
1323 dnl # Third and sixth 'struct vfsmount *' argument removed.
1324 dnl #
1325 AC_DEFUN([SPL_AC_4ARGS_VFS_RENAME],
1326         [AC_MSG_CHECKING([whether vfs_rename() wants 4 args])
1327         SPL_LINUX_TRY_COMPILE([
1328                 #include <linux/fs.h>
1329         ],[
1330                 vfs_rename(NULL, NULL, NULL, NULL);
1331         ],[
1332                 AC_MSG_RESULT(yes)
1333                 AC_DEFINE(HAVE_4ARGS_VFS_RENAME, 1,
1334                           [vfs_rename() wants 4 args])
1335         ],[
1336                 AC_MSG_RESULT(no)
1337         ])
1338 ])
1339
1340 dnl #
1341 dnl # 2.6.29 API change,
1342 dnl # check whether 'struct cred' exists
1343 dnl #
1344 AC_DEFUN([SPL_AC_CRED_STRUCT], [
1345         AC_MSG_CHECKING([whether struct cred exists])
1346         SPL_LINUX_TRY_COMPILE([
1347                 #include <linux/cred.h>
1348         ],[
1349                 struct cred *cr;
1350                 cr  = NULL;
1351         ],[
1352                 AC_MSG_RESULT(yes)
1353                 AC_DEFINE(HAVE_CRED_STRUCT, 1, [struct cred exists])
1354         ],[
1355                 AC_MSG_RESULT(no)
1356         ])
1357 ])
1358
1359 dnl #
1360 dnl # Custom SPL patch may export this symbol.
1361 dnl #
1362 AC_DEFUN([SPL_AC_GROUPS_SEARCH], [
1363         SPL_CHECK_SYMBOL_EXPORT(
1364                 [groups_search],
1365                 [],
1366                 [AC_DEFINE(HAVE_GROUPS_SEARCH, 1,
1367                 [groups_search() is available])],
1368                 [])
1369 ])
1370
1371 dnl #
1372 dnl # 2.6.x API change,
1373 dnl # __put_task_struct() was exported in RHEL5 but unavailable elsewhere.
1374 dnl #
1375 AC_DEFUN([SPL_AC_PUT_TASK_STRUCT], [
1376         SPL_CHECK_SYMBOL_EXPORT(
1377                 [__put_task_struct],
1378                 [],
1379                 [AC_DEFINE(HAVE_PUT_TASK_STRUCT, 1,
1380                 [__put_task_struct() is available])],
1381                 [])
1382 ])
1383
1384 dnl #
1385 dnl # 2.6.32 API change,
1386 dnl # Unused 'struct file *' removed from prototype.
1387 dnl #
1388 AC_DEFUN([SPL_AC_5ARGS_PROC_HANDLER], [
1389         AC_MSG_CHECKING([whether proc_handler() wants 5 args])
1390         SPL_LINUX_TRY_COMPILE([
1391                 #include <linux/sysctl.h>
1392         ],[
1393                 proc_dostring(NULL, 0, NULL, NULL, NULL);
1394         ],[
1395                 AC_MSG_RESULT(yes)
1396                 AC_DEFINE(HAVE_5ARGS_PROC_HANDLER, 1,
1397                           [proc_handler() wants 5 args])
1398         ],[
1399                 AC_MSG_RESULT(no)
1400         ])
1401 ])