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         SPL_AC_KVASPRINTF
  79 ])
  80
  81 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
  82         modpost=$LINUX/scripts/Makefile.modpost
  83         AC_MSG_CHECKING([kernel file name for module symbols])
  84         if test -f "$modpost"; then
  85                 if grep -q Modules.symvers $modpost; then
  86                         LINUX_SYMBOLS=Modules.symvers
  87                 else
  88                         LINUX_SYMBOLS=Module.symvers
  89                 fi
  90         else
  91                 LINUX_SYMBOLS=NONE
  92         fi
  93         AC_MSG_RESULT($LINUX_SYMBOLS)
  94         AC_SUBST(LINUX_SYMBOLS)
  95 ])
  96
  97 AC_DEFUN([SPL_AC_KERNEL], [
  98         AC_ARG_WITH([linux],
  99                 AS_HELP_STRING([--with-linux=PATH],
 100                 [Path to kernel source]),
 101                 [kernelsrc="$withval"])
 102
 103         AC_ARG_WITH([linux-obj],
 104                 AS_HELP_STRING([--with-linux-obj=PATH],
 105                 [Path to kernel build objects]),
 106                 [kernelbuild="$withval"])
 107
 108         AC_MSG_CHECKING([kernel source directory])
 109         if test -z "$kernelsrc"; then
 110                 headersdir="/lib/modules/$(uname -r)/build"
 111                 if test -e "$headersdir"; then
 112                         sourcelink=$(readlink -f "$headersdir")
 113                 else
 114                         sourcelink=$(ls -1d /usr/src/kernels/* \
 115                                      /usr/src/linux-* \
 116                                      2>/dev/null | grep -v obj | tail -1)
 117                 fi
 118
 119                 if test -e ${sourcelink}; then
 120                         kernelsrc=`readlink -f ${sourcelink}`
 121                 else
 122                         AC_MSG_RESULT([Not found])
 123                         AC_MSG_ERROR([
 124                         *** Please specify the location of the kernel source
 125                         *** with the '--with-linux=PATH' option])
 126                 fi
 127         else
 128                 if test "$kernelsrc" = "NONE"; then
 129                         kernsrcver=NONE
 130                 fi
 131         fi
 132
 133         AC_MSG_RESULT([$kernelsrc])
 134         AC_MSG_CHECKING([kernel build directory])
 135         if test -z "$kernelbuild"; then
 136                 if test -d ${kernelsrc}-obj/`arch`/`arch`; then
 137                         kernelbuild=${kernelsrc}-obj/`arch`/`arch`
 138                 elif test -d ${kernelsrc}-obj/`arch`/default; then
 139                         kernelbuild=${kernelsrc}-obj/`arch`/default
 140                 elif test -d `dirname ${kernelsrc}`/build-`arch`; then
 141                         kernelbuild=`dirname ${kernelsrc}`/build-`arch`
 142                 else
 143                         kernelbuild=${kernelsrc}
 144                 fi
 145         fi
 146         AC_MSG_RESULT([$kernelbuild])
 147
 148         AC_MSG_CHECKING([kernel source version])
 149         utsrelease1=$kernelbuild/include/linux/version.h
 150         utsrelease2=$kernelbuild/include/linux/utsrelease.h
 151         utsrelease3=$kernelbuild/include/generated/utsrelease.h
 152         if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
 153                 utsrelease=linux/version.h
 154         elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
 155                 utsrelease=linux/utsrelease.h
 156         elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
 157                 utsrelease=generated/utsrelease.h
 158         fi
 159
 160         if test "$utsrelease"; then
 161                 kernsrcver=`(echo "#include <$utsrelease>";
 162                              echo "kernsrcver=UTS_RELEASE") |
 163                              cpp -I $kernelbuild/include |
 164                              grep "^kernsrcver=" | cut -d \" -f 2`
 165
 166                 if test -z "$kernsrcver"; then
 167                         AC_MSG_RESULT([Not found])
 168                         AC_MSG_ERROR([*** Cannot determine kernel version.])
 169                 fi
 170         else
 171                 AC_MSG_RESULT([Not found])
 172                 AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
 173         fi
 174
 175         AC_MSG_RESULT([$kernsrcver])
 176
 177         LINUX=${kernelsrc}
 178         LINUX_OBJ=${kernelbuild}
 179         LINUX_VERSION=${kernsrcver}
 180
 181         AC_SUBST(LINUX)
 182         AC_SUBST(LINUX_OBJ)
 183         AC_SUBST(LINUX_VERSION)
 184
 185         SPL_AC_MODULE_SYMVERS
 186 ])
 187
 188 dnl #
 189 dnl # Default SPL user configuration
 190 dnl #
 191 AC_DEFUN([SPL_AC_CONFIG_USER], [])
 192
 193 AC_DEFUN([SPL_AC_LICENSE], [
 194         AC_MSG_CHECKING([spl license])
 195         LICENSE=GPL
 196         AC_MSG_RESULT([$LICENSE])
 197         KERNELCPPFLAGS="${KERNELCPPFLAGS} -DHAVE_GPL_ONLY_SYMBOLS"
 198         AC_SUBST(LICENSE)
 199 ])
 200
 201 AC_DEFUN([SPL_AC_CONFIG], [
 202         SPL_CONFIG=all
 203         AC_ARG_WITH([config],
 204                 AS_HELP_STRING([--with-config=CONFIG],
 205                 [Config file 'kernel|user|all|srpm']),
 206                 [SPL_CONFIG="$withval"])
 207
 208         AC_MSG_CHECKING([spl config])
 209         AC_MSG_RESULT([$SPL_CONFIG]);
 210         AC_SUBST(SPL_CONFIG)
 211
 212         case "$SPL_CONFIG" in
 213                 kernel) SPL_AC_CONFIG_KERNEL ;;
 214                 user)   SPL_AC_CONFIG_USER   ;;
 215                 all)    SPL_AC_CONFIG_KERNEL
 216                         SPL_AC_CONFIG_USER   ;;
 217                 srpm)                        ;;
 218                 *)
 219                 AC_MSG_RESULT([Error!])
 220                 AC_MSG_ERROR([Bad value "$SPL_CONFIG" for --with-config,
 221                               user kernel|user|all|srpm]) ;;
 222         esac
 223
 224         AM_CONDITIONAL([CONFIG_USER],
 225                        [test "$SPL_CONFIG" = user] ||
 226                        [test "$SPL_CONFIG" = all])
 227         AM_CONDITIONAL([CONFIG_KERNEL],
 228                        [test "$SPL_CONFIG" = kernel] ||
 229                        [test "$SPL_CONFIG" = all])
 230 ])
 231
 232 dnl #
 233 dnl # Enable if the SPL should be compiled with internal debugging enabled.
 234 dnl # By default this support is disabled.
 235 dnl #
 236 AC_DEFUN([SPL_AC_DEBUG], [
 237         AC_ARG_ENABLE([debug],
 238                 [AS_HELP_STRING([--enable-debug],
 239                 [Enable generic debug support @<:@default=no@:>@])],
 240                 [],
 241                 [enable_debug=no])
 242
 243         AS_IF([test "x$enable_debug" = xyes],
 244                 [KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG"],
 245                 [KERNELCPPFLAGS="${KERNELCPPFLAGS} -DNDEBUG"])
 246
 247         AC_MSG_CHECKING([whether debugging is enabled])
 248         AC_MSG_RESULT([$enable_debug])
 249 ])
 250
 251 dnl #
 252 dnl # Enabled by default it provides a minimal level of memory tracking.
 253 dnl # A total count of bytes allocated is kept for each alloc and free.
 254 dnl # Then at module unload time a report to the console will be printed
 255 dnl # if memory was leaked.  Additionally, /proc/spl/kmem/slab will exist
 256 dnl # and provide an easy way to inspect the kmem based slab.
 257 dnl #
 258 AC_DEFUN([SPL_AC_DEBUG_KMEM], [
 259         AC_ARG_ENABLE([debug-kmem],
 260                 [AS_HELP_STRING([--enable-debug-kmem],
 261                 [Enable basic kmem accounting @<:@default=yes@:>@])],
 262                 [],
 263                 [enable_debug_kmem=yes])
 264
 265         AS_IF([test "x$enable_debug_kmem" = xyes],
 266                 [AC_DEFINE([DEBUG_KMEM], [1],
 267                 [Define to 1 to enable basic kmem accounting])
 268                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM"])
 269
 270         AC_MSG_CHECKING([whether basic kmem accounting is enabled])
 271         AC_MSG_RESULT([$enable_debug_kmem])
 272 ])
 273
 274 dnl #
 275 dnl # Disabled by default it provides detailed memory tracking.  This
 276 dnl # feature also requires --enable-debug-kmem to be set.  When enabled
 277 dnl # not only will total bytes be tracked but also the location of every
 278 dnl # alloc and free.  When the SPL module is unloaded a list of all leaked
 279 dnl # addresses and where they were allocated will be dumped to the console.
 280 dnl # Enabling this feature has a significant impact on performance but it
 281 dnl # makes finding memory leaks pretty straight forward.
 282 dnl #
 283 AC_DEFUN([SPL_AC_DEBUG_KMEM_TRACKING], [
 284         AC_ARG_ENABLE([debug-kmem-tracking],
 285                 [AS_HELP_STRING([--enable-debug-kmem-tracking],
 286                 [Enable detailed kmem tracking  @<:@default=no@:>@])],
 287                 [],
 288                 [enable_debug_kmem_tracking=no])
 289
 290         AS_IF([test "x$enable_debug_kmem_tracking" = xyes],
 291                 [AC_DEFINE([DEBUG_KMEM_TRACKING], [1],
 292                 [Define to 1 to enable detailed kmem tracking])
 293                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM_TRACKING"])
 294
 295         AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
 296         AC_MSG_RESULT([$enable_debug_kmem_tracking])
 297 ])
 298
 299 dnl #
 300 dnl # SPL_LINUX_CONFTEST
 301 dnl #
 302 AC_DEFUN([SPL_LINUX_CONFTEST], [
 303 cat >conftest.c <<_ACEOF
 304 $1
 305 _ACEOF
 306 ])
 307
 308 dnl #
 309 dnl # SPL_LANG_PROGRAM(C)([PROLOGUE], [BODY])
 310 dnl #
 311 m4_define([SPL_LANG_PROGRAM], [
 312 $1
 313 int
 314 main (void)
 315 {
 316 dnl Do *not* indent the following line: there may be CPP directives.
 317 dnl Don't move the `;' right after for the same reason.
 318 $2
 319   ;
 320   return 0;
 321 }
 322 ])
 323
 324 dnl #
 325 dnl # SPL_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
 326 dnl #
 327 AC_DEFUN([SPL_LINUX_COMPILE_IFELSE], [
 328         m4_ifvaln([$1], [SPL_LINUX_CONFTEST([$1])])
 329         rm -Rf build && mkdir -p build
 330         echo "obj-m := conftest.o" >build/Makefile
 331         AS_IF(
 332                 [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])],
 333                 [$4],
 334                 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
 335         )
 336         rm -Rf build
 337 ])
 338
 339 dnl #
 340 dnl # SPL_LINUX_TRY_COMPILE like AC_TRY_COMPILE
 341 dnl #
 342 AC_DEFUN([SPL_LINUX_TRY_COMPILE],
 343         [SPL_LINUX_COMPILE_IFELSE(
 344         [AC_LANG_SOURCE([SPL_LANG_PROGRAM([[$1]], [[$2]])])],
 345         [modules],
 346         [test -s build/conftest.o],
 347         [$3], [$4])
 348 ])
 349
 350 dnl #
 351 dnl # SPL_LINUX_CONFIG
 352 dnl #
 353 AC_DEFUN([SPL_LINUX_CONFIG],
 354         [AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
 355         SPL_LINUX_TRY_COMPILE([
 356                 #ifndef AUTOCONF_INCLUDED
 357                 #include <linux/config.h>
 358                 #endif
 359         ],[
 360                 #ifndef CONFIG_$1
 361                 #error CONFIG_$1 not #defined
 362                 #endif
 363         ],[
 364                 AC_MSG_RESULT([yes])
 365                 $2
 366         ],[
 367                 AC_MSG_RESULT([no])
 368                 $3
 369         ])
 370 ])
 371
 372 dnl #
 373 dnl # SPL_CHECK_SYMBOL_EXPORT
 374 dnl # check symbol exported or not
 375 dnl #
 376 AC_DEFUN([SPL_CHECK_SYMBOL_EXPORT],
 377         [AC_MSG_CHECKING([whether symbol $1 is exported])
 378         grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
 379                 $LINUX_OBJ/Module*.symvers 2>/dev/null
 380         rc=$?
 381         if test $rc -ne 0; then
 382                 export=0
 383                 for file in $2; do
 384                         grep -q -E "EXPORT_SYMBOL.*($1)" \
 385                                 "$LINUX_OBJ/$file" 2>/dev/null
 386                         rc=$?
 387                         if test $rc -eq 0; then
 388                                 export=1
 389                                 break;
 390                         fi
 391                 done
 392                 if test $export -eq 0; then
 393                         AC_MSG_RESULT([no])
 394                         $4
 395                 else
 396                         AC_MSG_RESULT([yes])
 397                         $3
 398                 fi
 399         else
 400                 AC_MSG_RESULT([yes])
 401                 $3
 402         fi
 403 ])
 404
 405 dnl #
 406 dnl # SPL_CHECK_HEADER
 407 dnl # check whether header exists and define HAVE_$2_HEADER
 408 dnl #
 409 AC_DEFUN([SPL_CHECK_HEADER],
 410         [AC_MSG_CHECKING([whether header $1 exists])
 411         SPL_LINUX_TRY_COMPILE([
 412                 #include <$1>
 413         ],[
 414                 return 0;
 415         ],[
 416                 AC_DEFINE(HAVE_$2_HEADER, 1, [$1 exists])
 417                 AC_MSG_RESULT(yes)
 418                 $3
 419         ],[
 420                 AC_MSG_RESULT(no)
 421                 $4
 422         ])
 423 ])
 424
 425 dnl #
 426 dnl # Use the atomic implemenation based on global spinlocks.  This
 427 dnl # should only be needed by 32-bit kernels which do not provide
 428 dnl # the atomic64_* API.  It may be optionally enabled as a fallback
 429 dnl # if problems are observed with the direct mapping to the native
 430 dnl # Linux atomic operations.  You may not disable atomic spinlocks
 431 dnl # if you kernel does not an atomic64_* API.
 432 dnl #
 433 AC_DEFUN([SPL_AC_ATOMIC_SPINLOCK], [
 434         AC_ARG_ENABLE([atomic-spinlocks],
 435                 [AS_HELP_STRING([--enable-atomic-spinlocks],
 436                 [Atomic types use spinlocks @<:@default=check@:>@])],
 437                 [],
 438                 [enable_atomic_spinlocks=check])
 439
 440         SPL_LINUX_TRY_COMPILE([
 441                 #include <asm/atomic.h>
 442         ],[
 443                 atomic64_t *ptr;
 444         ],[
 445                 have_atomic64_t=yes
 446                 AC_DEFINE(HAVE_ATOMIC64_T, 1,
 447                         [kernel defines atomic64_t])
 448         ],[
 449                 have_atomic64_t=no
 450         ])
 451
 452         AS_IF([test "x$enable_atomic_spinlocks" = xcheck], [
 453                 AS_IF([test "x$have_atomic64_t" = xyes], [
 454                         enable_atomic_spinlocks=no
 455                 ],[
 456                         enable_atomic_spinlocks=yes
 457                 ])
 458         ])
 459
 460         AS_IF([test "x$enable_atomic_spinlocks" = xyes], [
 461                 AC_DEFINE([ATOMIC_SPINLOCK], [1],
 462                         [Atomic types use spinlocks])
 463         ],[
 464                 AS_IF([test "x$have_atomic64_t" = xno], [
 465                         AC_MSG_FAILURE(
 466                         [--disable-atomic-spinlocks given but required atomic64 support is unavailable])
 467                 ])
 468         ])
 469
 470         AC_MSG_CHECKING([whether atomic types use spinlocks])
 471         AC_MSG_RESULT([$enable_atomic_spinlocks])
 472
 473         AC_MSG_CHECKING([whether kernel defines atomic64_t])
 474         AC_MSG_RESULT([$have_atomic64_t])
 475 ])
 476
 477 dnl #
 478 dnl # 2.6.24 API change,
 479 dnl # check if atomic64_cmpxchg is defined
 480 dnl #
 481 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_CMPXCHG],
 482         [AC_MSG_CHECKING([whether kernel defines atomic64_cmpxchg])
 483         SPL_LINUX_TRY_COMPILE([
 484                 #include <asm/atomic.h>
 485         ],[
 486                 atomic64_cmpxchg((atomic64_t *)NULL, 0, 0);
 487         ],[
 488                 AC_MSG_RESULT([yes])
 489                 AC_DEFINE(HAVE_ATOMIC64_CMPXCHG, 1,
 490                           [kernel defines atomic64_cmpxchg])
 491         ],[
 492                 AC_MSG_RESULT([no])
 493         ])
 494 ])
 495
 496 dnl #
 497 dnl # 2.6.24 API change,
 498 dnl # check if atomic64_xchg is defined
 499 dnl #
 500 AC_DEFUN([SPL_AC_TYPE_ATOMIC64_XCHG],
 501         [AC_MSG_CHECKING([whether kernel defines atomic64_xchg])
 502         SPL_LINUX_TRY_COMPILE([
 503                 #include <asm/atomic.h>
 504         ],[
 505                 atomic64_xchg((atomic64_t *)NULL, 0);
 506         ],[
 507                 AC_MSG_RESULT([yes])
 508                 AC_DEFINE(HAVE_ATOMIC64_XCHG, 1,
 509                           [kernel defines atomic64_xchg])
 510         ],[
 511                 AC_MSG_RESULT([no])
 512         ])
 513 ])
 514
 515 dnl #
 516 dnl # 2.6.24 API change,
 517 dnl # check if uintptr_t typedef is defined
 518 dnl #
 519 AC_DEFUN([SPL_AC_TYPE_UINTPTR_T],
 520         [AC_MSG_CHECKING([whether kernel defines uintptr_t])
 521         SPL_LINUX_TRY_COMPILE([
 522                 #include <linux/types.h>
 523         ],[
 524                 uintptr_t *ptr;
 525         ],[
 526                 AC_MSG_RESULT([yes])
 527                 AC_DEFINE(HAVE_UINTPTR_T, 1,
 528                           [kernel defines uintptr_t])
 529         ],[
 530                 AC_MSG_RESULT([no])
 531         ])
 532 ])
 533
 534 dnl #
 535 dnl # 2.6.20 API change,
 536 dnl # INIT_WORK use 2 args and not store data inside
 537 dnl #
 538 AC_DEFUN([SPL_AC_3ARGS_INIT_WORK],
 539         [AC_MSG_CHECKING([whether INIT_WORK wants 3 args])
 540         SPL_LINUX_TRY_COMPILE([
 541                 #include <linux/workqueue.h>
 542         ],[
 543                 struct work_struct work;
 544                 INIT_WORK(&work, NULL, NULL);
 545         ],[
 546                 AC_MSG_RESULT(yes)
 547                 AC_DEFINE(HAVE_3ARGS_INIT_WORK, 1,
 548                           [INIT_WORK wants 3 args])
 549         ],[
 550                 AC_MSG_RESULT(no)
 551         ])
 552 ])
 553
 554 dnl #
 555 dnl # 2.6.21 API change,
 556 dnl # 'register_sysctl_table' use only one argument instead of two
 557 dnl #
 558 AC_DEFUN([SPL_AC_2ARGS_REGISTER_SYSCTL],
 559         [AC_MSG_CHECKING([whether register_sysctl_table() wants 2 args])
 560         SPL_LINUX_TRY_COMPILE([
 561                 #include <linux/sysctl.h>
 562         ],[
 563                 return register_sysctl_table(NULL,0);
 564         ],[
 565                 AC_MSG_RESULT(yes)
 566                 AC_DEFINE(HAVE_2ARGS_REGISTER_SYSCTL, 1,
 567                           [register_sysctl_table() wants 2 args])
 568         ],[
 569                 AC_MSG_RESULT(no)
 570         ])
 571 ])
 572
 573 dnl #
 574 dnl # 2.6.23 API change
 575 dnl # Old set_shrinker API replaced with register_shrinker
 576 dnl #
 577 AC_DEFUN([SPL_AC_SET_SHRINKER], [
 578         AC_MSG_CHECKING([whether set_shrinker() available])
 579         SPL_LINUX_TRY_COMPILE([
 580                 #include <linux/mm.h>
 581         ],[
 582                 return set_shrinker(DEFAULT_SEEKS, NULL);
 583         ],[
 584                 AC_MSG_RESULT([yes])
 585                 AC_DEFINE(HAVE_SET_SHRINKER, 1,
 586                           [set_shrinker() available])
 587         ],[
 588                 AC_MSG_RESULT([no])
 589         ])
 590 ])
 591
 592 dnl #
 593 dnl # 2.6.25 API change,
 594 dnl # struct path entry added to struct nameidata
 595 dnl #
 596 AC_DEFUN([SPL_AC_PATH_IN_NAMEIDATA],
 597         [AC_MSG_CHECKING([whether struct path used in struct nameidata])
 598         SPL_LINUX_TRY_COMPILE([
 599                 #include <linux/namei.h>
 600         ],[
 601                 struct nameidata nd;
 602
 603                 nd.path.mnt = NULL;
 604                 nd.path.dentry = NULL;
 605         ],[
 606                 AC_MSG_RESULT(yes)
 607                 AC_DEFINE(HAVE_PATH_IN_NAMEIDATA, 1,
 608                           [struct path used in struct nameidata])
 609         ],[
 610                 AC_MSG_RESULT(no)
 611         ])
 612 ])
 613
 614 dnl #
 615 dnl # Custom SPL patch may export this system it is not required
 616 dnl #
 617 AC_DEFUN([SPL_AC_TASK_CURR], [
 618         SPL_CHECK_SYMBOL_EXPORT([task_curr], [kernel/sched.c],
 619                 [AC_DEFINE(HAVE_TASK_CURR, 1, [task_curr() exported])],
 620                 [])
 621 ])
 622
 623 dnl #
 624 dnl # 2.6.19 API change,
 625 dnl # Use CTL_UNNUMBERED when binary sysctl is not required
 626 dnl #
 627 AC_DEFUN([SPL_AC_CTL_UNNUMBERED],
 628         [AC_MSG_CHECKING([whether unnumbered sysctl support exists])
 629         SPL_LINUX_TRY_COMPILE([
 630                 #include <linux/sysctl.h>
 631         ],[
 632                 #ifndef CTL_UNNUMBERED
 633                 #error CTL_UNNUMBERED undefined
 634                 #endif
 635         ],[
 636                 AC_MSG_RESULT(yes)
 637                 AC_DEFINE(HAVE_CTL_UNNUMBERED, 1,
 638                           [unnumbered sysctl support exists])
 639         ],[
 640                 AC_MSG_RESULT(no)
 641         ])
 642 ])
 643
 644 dnl #
 645 dnl # 2.6.16 API change.
 646 dnl # Check if 'fls64()' is available
 647 dnl #
 648 AC_DEFUN([SPL_AC_FLS64],
 649         [AC_MSG_CHECKING([whether fls64() is available])
 650         SPL_LINUX_TRY_COMPILE([
 651                 #include <linux/bitops.h>
 652         ],[
 653                 return fls64(0);
 654         ],[
 655                 AC_MSG_RESULT(yes)
 656                 AC_DEFINE(HAVE_FLS64, 1, [fls64() is available])
 657         ],[
 658                 AC_MSG_RESULT(no)
 659         ])
 660 ])
 661
 662 dnl #
 663 dnl # 2.6.18 API change, check whether device_create() is available.
 664 dnl # Device_create() was introduced in 2.6.18 and depricated
 665 dnl # class_device_create() which was fully removed in 2.6.26.
 666 dnl #
 667 AC_DEFUN([SPL_AC_DEVICE_CREATE], [
 668         SPL_CHECK_SYMBOL_EXPORT(
 669                 [device_create],
 670                 [drivers/base/core.c],
 671                 [AC_DEFINE(HAVE_DEVICE_CREATE, 1,
 672                 [device_create() is available])],
 673                 [])
 674 ])
 675
 676 dnl #
 677 dnl # 2.6.27 API change,
 678 dnl # device_create() uses 5 args, new 'drvdata' argument.
 679 dnl #
 680 AC_DEFUN([SPL_AC_5ARGS_DEVICE_CREATE], [
 681         AC_MSG_CHECKING([whether device_create() wants 5 args])
 682         tmp_flags="$EXTRA_KCFLAGS"
 683         EXTRA_KCFLAGS="-Werror"
 684         SPL_LINUX_TRY_COMPILE([
 685                 #include <linux/device.h>
 686         ],[
 687                 device_create(NULL, NULL, 0, NULL, "%d", 1);
 688         ],[
 689                 AC_MSG_RESULT(yes)
 690                 AC_DEFINE(HAVE_5ARGS_DEVICE_CREATE, 1,
 691                           [device_create wants 5 args])
 692         ],[
 693                 AC_MSG_RESULT(no)
 694         ])
 695         EXTRA_KCFLAGS="$tmp_flags"
 696 ])
 697
 698 dnl #
 699 dnl # 2.6.13 API change, check whether class_device_create() is available.
 700 dnl # Class_device_create() was introduced in 2.6.13 and depricated
 701 dnl # class_simple_device_add() which was fully removed in 2.6.13.
 702 dnl #
 703 AC_DEFUN([SPL_AC_CLASS_DEVICE_CREATE], [
 704         SPL_CHECK_SYMBOL_EXPORT(
 705                 [class_device_create],
 706                 [drivers/base/class.c],
 707                 [AC_DEFINE(HAVE_CLASS_DEVICE_CREATE, 1,
 708                 [class_device_create() is available])],
 709                 [])
 710 ])
 711
 712 dnl #
 713 dnl # 2.6.26 API change, set_normalized_timespec() is exported.
 714 dnl #
 715 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT], [
 716         SPL_CHECK_SYMBOL_EXPORT(
 717                 [set_normalized_timespec],
 718                 [kernel/time.c],
 719                 [AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_EXPORT, 1,
 720                 [set_normalized_timespec() is available as export])],
 721                 [])
 722 ])
 723
 724 dnl #
 725 dnl # 2.6.16 API change, set_normalize_timespec() moved to time.c
 726 dnl # previously it was available in time.h as an inline.
 727 dnl #
 728 AC_DEFUN([SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE], [
 729         AC_MSG_CHECKING([whether set_normalized_timespec() is an inline])
 730         SPL_LINUX_TRY_COMPILE([
 731                 #include <linux/time.h>
 732                 void set_normalized_timespec(struct timespec *ts,
 733                                              time_t sec, long nsec) { }
 734         ],
 735         [],
 736         [
 737                 AC_MSG_RESULT(no)
 738         ],[
 739                 AC_MSG_RESULT(yes)
 740                 AC_DEFINE(HAVE_SET_NORMALIZED_TIMESPEC_INLINE, 1,
 741                           [set_normalized_timespec() is available as inline])
 742         ])
 743 ])
 744
 745 dnl #
 746 dnl # 2.6.18 API change,
 747 dnl # timespec_sub() inline function available in linux/time.h
 748 dnl #
 749 AC_DEFUN([SPL_AC_TIMESPEC_SUB], [
 750         AC_MSG_CHECKING([whether timespec_sub() is available])
 751         SPL_LINUX_TRY_COMPILE([
 752                 #include <linux/time.h>
 753         ],[
 754                 struct timespec a, b, c = { 0 };
 755                 c = timespec_sub(a, b);
 756         ],[
 757                 AC_MSG_RESULT(yes)
 758                 AC_DEFINE(HAVE_TIMESPEC_SUB, 1, [timespec_sub() is available])
 759         ],[
 760                 AC_MSG_RESULT(no)
 761         ])
 762 ])
 763
 764 dnl #
 765 dnl # 2.6.19 API change,
 766 dnl # check if init_utsname() is available in linux/utsname.h
 767 dnl #
 768 AC_DEFUN([SPL_AC_INIT_UTSNAME], [
 769         AC_MSG_CHECKING([whether init_utsname() is available])
 770         SPL_LINUX_TRY_COMPILE([
 771                 #include <linux/utsname.h>
 772         ],[
 773                 struct new_utsname *a = init_utsname();
 774         ],[
 775                 AC_MSG_RESULT(yes)
 776                 AC_DEFINE(HAVE_INIT_UTSNAME, 1, [init_utsname() is available])
 777         ],[
 778                 AC_MSG_RESULT(no)
 779         ])
 780 ])
 781
 782 dnl #
 783 dnl # 2.6.26 API change,
 784 dnl # definition of struct fdtable relocated to linux/fdtable.h
 785 dnl #
 786 AC_DEFUN([SPL_AC_FDTABLE_HEADER], [
 787         SPL_CHECK_HEADER([linux/fdtable.h], [FDTABLE], [], [])
 788 ])
 789
 790 dnl #
 791 dnl # 2.6.14 API change,
 792 dnl # check whether 'files_fdtable()' exists
 793 dnl #
 794 AC_DEFUN([SPL_AC_FILES_FDTABLE], [
 795         AC_MSG_CHECKING([whether files_fdtable() is available])
 796         SPL_LINUX_TRY_COMPILE([
 797                 #include <linux/sched.h>
 798                 #include <linux/file.h>
 799                 #ifdef HAVE_FDTABLE_HEADER
 800                 #include <linux/fdtable.h>
 801                 #endif
 802         ],[
 803                 struct files_struct *files = current->files;
 804                 struct fdtable *fdt = files_fdtable(files);
 805         ],[
 806                 AC_MSG_RESULT(yes)
 807                 AC_DEFINE(HAVE_FILES_FDTABLE, 1, [files_fdtable() is available])
 808         ],[
 809                 AC_MSG_RESULT(no)
 810         ])
 811 ])
 812
 813 dnl #
 814 dnl # 2.6.18 API change,
 815 dnl # added linux/uaccess.h
 816 dnl #
 817 AC_DEFUN([SPL_AC_UACCESS_HEADER], [
 818         SPL_CHECK_HEADER([linux/uaccess.h], [UACCESS], [], [])
 819 ])
 820
 821 dnl #
 822 dnl # 2.6.12 API change,
 823 dnl # check whether 'kmalloc_node()' is available.
 824 dnl #
 825 AC_DEFUN([SPL_AC_KMALLOC_NODE], [
 826         AC_MSG_CHECKING([whether kmalloc_node() is available])
 827         SPL_LINUX_TRY_COMPILE([
 828                 #include <linux/slab.h>
 829         ],[
 830                 void *a = kmalloc_node(1, GFP_KERNEL, 0);
 831         ],[
 832                 AC_MSG_RESULT(yes)
 833                 AC_DEFINE(HAVE_KMALLOC_NODE, 1, [kmalloc_node() is available])
 834         ],[
 835                 AC_MSG_RESULT(no)
 836         ])
 837 ])
 838
 839 dnl #
 840 dnl # 2.6.9 API change,
 841 dnl # check whether 'monotonic_clock()' is available it may
 842 dnl # be available for some archs but not others.
 843 dnl #
 844 AC_DEFUN([SPL_AC_MONOTONIC_CLOCK], [
 845         SPL_CHECK_SYMBOL_EXPORT(
 846                 [monotonic_clock],
 847                 [],
 848                 [AC_DEFINE(HAVE_MONOTONIC_CLOCK, 1,
 849                 [monotonic_clock() is available])],
 850                 [])
 851 ])
 852
 853 dnl #
 854 dnl # 2.6.16 API change,
 855 dnl # check whether 'struct inode' has i_mutex
 856 dnl #
 857 AC_DEFUN([SPL_AC_INODE_I_MUTEX], [
 858         AC_MSG_CHECKING([whether struct inode has i_mutex])
 859         SPL_LINUX_TRY_COMPILE([
 860                 #include <linux/fs.h>
 861                 #include <linux/mutex.h>
 862         ],[
 863                 struct inode i;
 864                 mutex_init(&i.i_mutex);
 865         ],[
 866                 AC_MSG_RESULT(yes)
 867                 AC_DEFINE(HAVE_INODE_I_MUTEX, 1, [struct inode has i_mutex])
 868         ],[
 869                 AC_MSG_RESULT(no)
 870         ])
 871 ])
 872
 873 dnl #
 874 dnl # 2.6.29 API change,
 875 dnl # Adaptive mutexs introduced.
 876 dnl #
 877 AC_DEFUN([SPL_AC_MUTEX_OWNER], [
 878         AC_MSG_CHECKING([whether struct mutex has owner])
 879         SPL_LINUX_TRY_COMPILE([
 880                 #include <linux/mutex.h>
 881         ],[
 882                 struct mutex mtx;
 883                 mtx.owner = NULL;
 884         ],[
 885                 AC_MSG_RESULT(yes)
 886                 AC_DEFINE(HAVE_MUTEX_OWNER, 1, [struct mutex has owner])
 887         ],[
 888                 AC_MSG_RESULT(no)
 889         ])
 890 ])
 891
 892 dnl #
 893 dnl # 2.6.18 API change,
 894 dnl # First introduced 'mutex_lock_nested()' in include/linux/mutex.h,
 895 dnl # as part of the mutex validator.  Fallback to using 'mutex_lock()'
 896 dnl # if the mutex validator is disabled or otherwise unavailable.
 897 dnl #
 898 AC_DEFUN([SPL_AC_MUTEX_LOCK_NESTED], [
 899         AC_MSG_CHECKING([whether mutex_lock_nested() is available])
 900         SPL_LINUX_TRY_COMPILE([
 901                 #include <linux/mutex.h>
 902         ],[
 903                 struct mutex mutex;
 904                 mutex_init(&mutex);
 905                 mutex_lock_nested(&mutex, 0);
 906         ],[
 907                 AC_MSG_RESULT(yes)
 908                 AC_DEFINE(HAVE_MUTEX_LOCK_NESTED, 1,
 909                 [mutex_lock_nested() is available])
 910         ],[
 911                 AC_MSG_RESULT(no)
 912         ])
 913 ])
 914
 915 dnl #
 916 dnl # 2.6.22 API change,
 917 dnl # First introduced 'div64_64()' in lib/div64.c
 918 dnl
 919 AC_DEFUN([SPL_AC_DIV64_64], [
 920         SPL_CHECK_SYMBOL_EXPORT(
 921                 [div64_64],
 922                 [],
 923                 [AC_DEFINE(HAVE_DIV64_64, 1,
 924                 [div64_64() is available])],
 925                 [])
 926 ])
 927
 928 dnl #
 929 dnl # 2.6.26 API change,
 930 dnl # Renamed 'div64_64()' to 'div64_u64' in lib/div64.c
 931 dnl #
 932 AC_DEFUN([SPL_AC_DIV64_U64], [
 933         SPL_CHECK_SYMBOL_EXPORT(
 934                 [div64_u64],
 935                 [],
 936                 [AC_DEFINE(HAVE_DIV64_U64, 1,
 937                 [div64_u64() is available])],
 938                 [])
 939 ])
 940
 941 dnl #
 942 dnl # 2.6.27 API change,
 943 dnl # on_each_cpu() uses 3 args, no 'retry' argument
 944 dnl #
 945 AC_DEFUN([SPL_AC_3ARGS_ON_EACH_CPU], [
 946         AC_MSG_CHECKING([whether on_each_cpu() wants 3 args])
 947         SPL_LINUX_TRY_COMPILE([
 948                 #include <linux/smp.h>
 949         ],[
 950                 on_each_cpu(NULL, NULL, 0);
 951         ],[
 952                 AC_MSG_RESULT(yes)
 953                 AC_DEFINE(HAVE_3ARGS_ON_EACH_CPU, 1,
 954                           [on_each_cpu wants 3 args])
 955         ],[
 956                 AC_MSG_RESULT(no)
 957         ])
 958 ])
 959
 960 dnl #
 961 dnl # 2.6.18 API change,
 962 dnl # kallsyms_lookup_name no longer exported
 963 dnl #
 964 AC_DEFUN([SPL_AC_KALLSYMS_LOOKUP_NAME], [
 965         SPL_CHECK_SYMBOL_EXPORT(
 966                 [kallsyms_lookup_name],
 967                 [],
 968                 [AC_DEFINE(HAVE_KALLSYMS_LOOKUP_NAME, 1,
 969                 [kallsyms_lookup_name() is available])],
 970                 [])
 971 ])
 972
 973 dnl #
 974 dnl # Proposed API change,
 975 dnl # This symbol is not available in stock kernels.  You may build a
 976 dnl # custom kernel with the *-spl-export-symbols.patch which will export
 977 dnl # these symbols for use.  If your already rolling a custom kernel for
 978 dnl # your environment this is recommended.
 979 dnl #
 980 AC_DEFUN([SPL_AC_GET_VMALLOC_INFO], [
 981         SPL_CHECK_SYMBOL_EXPORT(
 982                 [get_vmalloc_info],
 983                 [],
 984                 [AC_DEFINE(HAVE_GET_VMALLOC_INFO, 1,
 985                 [get_vmalloc_info() is available])],
 986                 [])
 987 ])
 988
 989 dnl #
 990 dnl # 2.6.17 API change
 991 dnl # The helper functions first_online_pgdat(), next_online_pgdat(), and
 992 dnl # next_zone() are introduced to simplify for_each_zone().  These symbols
 993 dnl # were exported in 2.6.17 for use by modules which was consistent with
 994 dnl # the previous implementation of for_each_zone().  From 2.6.18 - 2.6.19
 995 dnl # the symbols were exported as 'unused', and by 2.6.20 they exports
 996 dnl # were dropped entirely leaving modules no way to directly iterate over
 997 dnl # the zone list.  Because we need access to the zone helpers we check
 998 dnl # if the kernel contains the old or new implementation.  Then we check
 999 dnl # to see if the symbols we need for each version are available.  If they
1000 dnl # are not, dynamically aquire the addresses with kallsyms_lookup_name().
1001 dnl #
1002 AC_DEFUN([SPL_AC_PGDAT_HELPERS], [
1003         AC_MSG_CHECKING([whether symbol *_pgdat exist])
1004         grep -q -E 'first_online_pgdat' $LINUX/include/linux/mmzone.h 2>/dev/null
1005         rc=$?
1006         if test $rc -eq 0; then
1007                 AC_MSG_RESULT([yes])
1008                 AC_DEFINE(HAVE_PGDAT_HELPERS, 1, [pgdat helpers are available])
1009         else
1010                 AC_MSG_RESULT([no])
1011         fi
1012 ])
1013
1014 dnl #
1015 dnl # Proposed API change,
1016 dnl # This symbol is not available in stock kernels.  You may build a
1017 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1018 dnl # these symbols for use.  If your already rolling a custom kernel for
1019 dnl # your environment this is recommended.
1020 dnl #
1021 AC_DEFUN([SPL_AC_FIRST_ONLINE_PGDAT], [
1022         SPL_CHECK_SYMBOL_EXPORT(
1023                 [first_online_pgdat],
1024                 [],
1025                 [AC_DEFINE(HAVE_FIRST_ONLINE_PGDAT, 1,
1026                 [first_online_pgdat() is available])],
1027                 [])
1028 ])
1029
1030 dnl #
1031 dnl # Proposed API change,
1032 dnl # This symbol is not available in stock kernels.  You may build a
1033 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1034 dnl # these symbols for use.  If your already rolling a custom kernel for
1035 dnl # your environment this is recommended.
1036 dnl #
1037 AC_DEFUN([SPL_AC_NEXT_ONLINE_PGDAT], [
1038         SPL_CHECK_SYMBOL_EXPORT(
1039                 [next_online_pgdat],
1040                 [],
1041                 [AC_DEFINE(HAVE_NEXT_ONLINE_PGDAT, 1,
1042                 [next_online_pgdat() is available])],
1043                 [])
1044 ])
1045
1046 dnl #
1047 dnl # Proposed API change,
1048 dnl # This symbol is not available in stock kernels.  You may build a
1049 dnl # custom kernel with the *-spl-export-symbols.patch which will export
1050 dnl # these symbols for use.  If your already rolling a custom kernel for
1051 dnl # your environment this is recommended.
1052 dnl #
1053 AC_DEFUN([SPL_AC_NEXT_ZONE], [
1054         SPL_CHECK_SYMBOL_EXPORT(
1055                 [next_zone],
1056                 [],
1057                 [AC_DEFINE(HAVE_NEXT_ZONE, 1,
1058                 [next_zone() is available])],
1059                 [])
1060 ])
1061
1062 dnl #
1063 dnl # 2.6.17 API change,
1064 dnl # See SPL_AC_PGDAT_HELPERS for details.
1065 dnl #
1066 AC_DEFUN([SPL_AC_PGDAT_LIST], [
1067         SPL_CHECK_SYMBOL_EXPORT(
1068                 [pgdat_list],
1069                 [],
1070                 [AC_DEFINE(HAVE_PGDAT_LIST, 1,
1071                 [pgdat_list is available])],
1072                 [])
1073 ])
1074
1075 dnl #
1076 dnl # 2.6.18 API change,
1077 dnl # First introduced global_page_state() support as an inline.
1078 dnl #
1079 AC_DEFUN([SPL_AC_GLOBAL_PAGE_STATE], [
1080         AC_MSG_CHECKING([whether global_page_state() is available])
1081         SPL_LINUX_TRY_COMPILE([
1082                 #include <linux/mm.h>
1083         ],[
1084                 unsigned long state;
1085                 state = global_page_state(0);
1086         ],[
1087                 AC_MSG_RESULT(yes)
1088                 AC_DEFINE(HAVE_GLOBAL_PAGE_STATE, 1,
1089                           [global_page_state() is available])
1090         ],[
1091                 AC_MSG_RESULT(no)
1092         ])
1093 ])
1094
1095 dnl #
1096 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1097 dnl # Public global zone stats now include a free page count.  However
1098 dnl # the enumerated names of the counters have changed since this API
1099 dnl # was introduced.  We need to deduce the corrent name to use.  This
1100 dnl # replaces the priviate get_zone_counts() interface.
1101 dnl #
1102 dnl # NR_FREE_PAGES was available from 2.6.21 to current kernels, which
1103 dnl # is 2.6.30 as of when this was written.
1104 dnl #
1105 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_FREE], [
1106         AC_MSG_CHECKING([whether page state NR_FREE_PAGES is available])
1107         SPL_LINUX_TRY_COMPILE([
1108                 #include <linux/mm.h>
1109         ],[
1110                 enum zone_stat_item zsi;
1111                 zsi = NR_FREE_PAGES;
1112         ],[
1113                 AC_MSG_RESULT(yes)
1114                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES, 1,
1115                           [Page state NR_FREE_PAGES is available])
1116         ],[
1117                 AC_MSG_RESULT(no)
1118         ])
1119 ])
1120
1121 dnl #
1122 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1123 dnl # Public global zone stats now include an inactive page count.  However
1124 dnl # the enumerated names of the counters have changed since this API
1125 dnl # was introduced.  We need to deduce the corrent name to use.  This
1126 dnl # replaces the priviate get_zone_counts() interface.
1127 dnl #
1128 dnl # NR_INACTIVE was available from 2.6.21 to 2.6.27 and included both
1129 dnl # anonymous and file inactive pages.  As of 2.6.28 it was split in
1130 dnl # to NR_INACTIVE_ANON and NR_INACTIVE_FILE.
1131 dnl #
1132 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_INACTIVE], [
1133         AC_MSG_CHECKING([whether page state NR_INACTIVE is available])
1134         SPL_LINUX_TRY_COMPILE([
1135                 #include <linux/mm.h>
1136         ],[
1137                 enum zone_stat_item zsi;
1138                 zsi = NR_INACTIVE;
1139         ],[
1140                 AC_MSG_RESULT(yes)
1141                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE, 1,
1142                           [Page state NR_INACTIVE is available])
1143         ],[
1144                 AC_MSG_RESULT(no)
1145         ])
1146
1147         AC_MSG_CHECKING([whether page state NR_INACTIVE_ANON is available])
1148         SPL_LINUX_TRY_COMPILE([
1149                 #include <linux/mm.h>
1150         ],[
1151                 enum zone_stat_item zsi;
1152                 zsi = NR_INACTIVE_ANON;
1153         ],[
1154                 AC_MSG_RESULT(yes)
1155                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON, 1,
1156                           [Page state NR_INACTIVE_ANON is available])
1157         ],[
1158                 AC_MSG_RESULT(no)
1159         ])
1160
1161         AC_MSG_CHECKING([whether page state NR_INACTIVE_FILE is available])
1162         SPL_LINUX_TRY_COMPILE([
1163                 #include <linux/mm.h>
1164         ],[
1165                 enum zone_stat_item zsi;
1166                 zsi = NR_INACTIVE_FILE;
1167         ],[
1168                 AC_MSG_RESULT(yes)
1169                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE, 1,
1170                           [Page state NR_INACTIVE_FILE is available])
1171         ],[
1172                 AC_MSG_RESULT(no)
1173         ])
1174 ])
1175
1176 dnl #
1177 dnl # 2.6.21 API change (plus subsequent naming convention changes),
1178 dnl # Public global zone stats now include an active page count.  However
1179 dnl # the enumerated names of the counters have changed since this API
1180 dnl # was introduced.  We need to deduce the corrent name to use.  This
1181 dnl # replaces the priviate get_zone_counts() interface.
1182 dnl #
1183 dnl # NR_ACTIVE was available from 2.6.21 to 2.6.27 and included both
1184 dnl # anonymous and file active pages.  As of 2.6.28 it was split in
1185 dnl # to NR_ACTIVE_ANON and NR_ACTIVE_FILE.
1186 dnl #
1187 AC_DEFUN([SPL_AC_ZONE_STAT_ITEM_ACTIVE], [
1188         AC_MSG_CHECKING([whether page state NR_ACTIVE is available])
1189         SPL_LINUX_TRY_COMPILE([
1190                 #include <linux/mm.h>
1191         ],[
1192                 enum zone_stat_item zsi;
1193                 zsi = NR_ACTIVE;
1194         ],[
1195                 AC_MSG_RESULT(yes)
1196                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE, 1,
1197                           [Page state NR_ACTIVE is available])
1198         ],[
1199                 AC_MSG_RESULT(no)
1200         ])
1201
1202         AC_MSG_CHECKING([whether page state NR_ACTIVE_ANON is available])
1203         SPL_LINUX_TRY_COMPILE([
1204                 #include <linux/mm.h>
1205         ],[
1206                 enum zone_stat_item zsi;
1207                 zsi = NR_ACTIVE_ANON;
1208         ],[
1209                 AC_MSG_RESULT(yes)
1210                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON, 1,
1211                           [Page state NR_ACTIVE_ANON is available])
1212         ],[
1213                 AC_MSG_RESULT(no)
1214         ])
1215
1216         AC_MSG_CHECKING([whether page state NR_ACTIVE_FILE is available])
1217         SPL_LINUX_TRY_COMPILE([
1218                 #include <linux/mm.h>
1219         ],[
1220                 enum zone_stat_item zsi;
1221                 zsi = NR_ACTIVE_FILE;
1222         ],[
1223                 AC_MSG_RESULT(yes)
1224                 AC_DEFINE(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE, 1,
1225                           [Page state NR_ACTIVE_FILE is available])
1226         ],[
1227                 AC_MSG_RESULT(no)
1228         ])
1229 ])
1230
1231 dnl #
1232 dnl # Proposed API change for legacy kernels.
1233 dnl # This symbol is not available in older kernels.  For kernels post
1234 dnl # 2.6.21 the global_page_state() API is used to get free/inactive/active
1235 dnl # page state information.  This symbol is only used in legacy kernels
1236 dnl # any only as a last resort.
1237 dnl
1238 AC_DEFUN([SPL_AC_GET_ZONE_COUNTS], [
1239         AC_MSG_CHECKING([whether symbol get_zone_counts is needed])
1240         SPL_LINUX_TRY_COMPILE([
1241         ],[
1242                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_FREE_PAGES)
1243                 #error "global_page_state needs NR_FREE_PAGES"
1244                 #endif
1245
1246                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE) && \
1247                     !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_ANON) && \
1248                     !defined(HAVE_ZONE_STAT_ITEM_NR_ACTIVE_FILE)
1249                 #error "global_page_state needs NR_ACTIVE*"
1250                 #endif
1251
1252                 #if !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE) && \
1253                     !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_ANON) && \
1254                     !defined(HAVE_ZONE_STAT_ITEM_NR_INACTIVE_FILE)
1255                 #error "global_page_state needs NR_INACTIVE*"
1256                 #endif
1257         ],[
1258                 AC_MSG_RESULT(no)
1259         ],[
1260                 AC_MSG_RESULT(yes)
1261                 AC_DEFINE(NEED_GET_ZONE_COUNTS, 1,
1262                           [get_zone_counts() is needed])
1263
1264                 SPL_CHECK_SYMBOL_EXPORT(
1265                         [get_zone_counts],
1266                         [],
1267                         [AC_DEFINE(HAVE_GET_ZONE_COUNTS, 1,
1268                         [get_zone_counts() is available])],
1269                         [])
1270         ])
1271 ])
1272
1273 dnl #
1274 dnl # Symbol available in RHEL kernels not in stock kernels.
1275 dnl #
1276 AC_DEFUN([SPL_AC_SET_FS_PWD], [
1277         SPL_CHECK_SYMBOL_EXPORT(
1278                 [set_fs_pwd],
1279                 [],
1280                 [AC_DEFINE(HAVE_SET_FS_PWD, 1,
1281                 [set_fs_pwd() is available])],
1282                 [])
1283 ])
1284
1285 dnl #
1286 dnl # 2.6.25 API change,
1287 dnl # Simplied API by replacing mnt+dentry args with a single path arg.
1288 dnl #
1289 AC_DEFUN([SPL_AC_2ARGS_SET_FS_PWD],
1290         [AC_MSG_CHECKING([whether set_fs_pwd() wants 2 args])
1291         SPL_LINUX_TRY_COMPILE([
1292                 #include <linux/sched.h>
1293                 #include <linux/fs_struct.h>
1294         ],[
1295                 set_fs_pwd(NULL, NULL);
1296         ],[
1297                 AC_MSG_RESULT(yes)
1298                 AC_DEFINE(HAVE_2ARGS_SET_FS_PWD, 1,
1299                           [set_fs_pwd() wants 2 args])
1300         ],[
1301                 AC_MSG_RESULT(no)
1302         ])
1303 ])
1304
1305 dnl #
1306 dnl # SLES API change, never adopted in mainline,
1307 dnl # Third 'struct vfsmount *' argument removed.
1308 dnl #
1309 AC_DEFUN([SPL_AC_2ARGS_VFS_UNLINK],
1310         [AC_MSG_CHECKING([whether vfs_unlink() wants 2 args])
1311         SPL_LINUX_TRY_COMPILE([
1312                 #include <linux/fs.h>
1313         ],[
1314                 vfs_unlink(NULL, NULL);
1315         ],[
1316                 AC_MSG_RESULT(yes)
1317                 AC_DEFINE(HAVE_2ARGS_VFS_UNLINK, 1,
1318                           [vfs_unlink() wants 2 args])
1319         ],[
1320                 AC_MSG_RESULT(no)
1321         ])
1322 ])
1323
1324 dnl #
1325 dnl # SLES API change, never adopted in mainline,
1326 dnl # Third and sixth 'struct vfsmount *' argument removed.
1327 dnl #
1328 AC_DEFUN([SPL_AC_4ARGS_VFS_RENAME],
1329         [AC_MSG_CHECKING([whether vfs_rename() wants 4 args])
1330         SPL_LINUX_TRY_COMPILE([
1331                 #include <linux/fs.h>
1332         ],[
1333                 vfs_rename(NULL, NULL, NULL, NULL);
1334         ],[
1335                 AC_MSG_RESULT(yes)
1336                 AC_DEFINE(HAVE_4ARGS_VFS_RENAME, 1,
1337                           [vfs_rename() wants 4 args])
1338         ],[
1339                 AC_MSG_RESULT(no)
1340         ])
1341 ])
1342
1343 dnl #
1344 dnl # 2.6.29 API change,
1345 dnl # check whether 'struct cred' exists
1346 dnl #
1347 AC_DEFUN([SPL_AC_CRED_STRUCT], [
1348         AC_MSG_CHECKING([whether struct cred exists])
1349         SPL_LINUX_TRY_COMPILE([
1350                 #include <linux/cred.h>
1351         ],[
1352                 struct cred *cr;
1353                 cr  = NULL;
1354         ],[
1355                 AC_MSG_RESULT(yes)
1356                 AC_DEFINE(HAVE_CRED_STRUCT, 1, [struct cred exists])
1357         ],[
1358                 AC_MSG_RESULT(no)
1359         ])
1360 ])
1361
1362 dnl #
1363 dnl # Custom SPL patch may export this symbol.
1364 dnl #
1365 AC_DEFUN([SPL_AC_GROUPS_SEARCH], [
1366         SPL_CHECK_SYMBOL_EXPORT(
1367                 [groups_search],
1368                 [],
1369                 [AC_DEFINE(HAVE_GROUPS_SEARCH, 1,
1370                 [groups_search() is available])],
1371                 [])
1372 ])
1373
1374 dnl #
1375 dnl # 2.6.x API change,
1376 dnl # __put_task_struct() was exported in RHEL5 but unavailable elsewhere.
1377 dnl #
1378 AC_DEFUN([SPL_AC_PUT_TASK_STRUCT], [
1379         SPL_CHECK_SYMBOL_EXPORT(
1380                 [__put_task_struct],
1381                 [],
1382                 [AC_DEFINE(HAVE_PUT_TASK_STRUCT, 1,
1383                 [__put_task_struct() is available])],
1384                 [])
1385 ])
1386
1387 dnl #
1388 dnl # 2.6.32 API change,
1389 dnl # Unused 'struct file *' removed from prototype.
1390 dnl #
1391 AC_DEFUN([SPL_AC_5ARGS_PROC_HANDLER], [
1392         AC_MSG_CHECKING([whether proc_handler() wants 5 args])
1393         SPL_LINUX_TRY_COMPILE([
1394                 #include <linux/sysctl.h>
1395         ],[
1396                 proc_dostring(NULL, 0, NULL, NULL, NULL);
1397         ],[
1398                 AC_MSG_RESULT(yes)
1399                 AC_DEFINE(HAVE_5ARGS_PROC_HANDLER, 1,
1400                           [proc_handler() wants 5 args])
1401         ],[
1402                 AC_MSG_RESULT(no)
1403         ])
1404 ])
1405
1406 dnl #
1407 dnl # 2.6.x API change,
1408 dnl # kvasprintf() function added.
1409 dnl #
1410 AC_DEFUN([SPL_AC_KVASPRINTF], [
1411         SPL_CHECK_SYMBOL_EXPORT(
1412                 [kvasprintf],
1413                 [],
1414                 [AC_DEFINE(HAVE_KVASPRINTF, 1,
1415                 [kvasprintf() is available])],
1416                 [])
1417 ])