src/cf/linux-test4.m4

   1 AC_DEFUN([LINUX_EXPORTS_TASKLIST_LOCK], [
   2   AC_CHECK_LINUX_BUILD([for exported tasklist_lock],
   3                        [ac_cv_linux_exports_tasklist_lock],
   4 [#include <linux/sched.h>],
   5 [
   6 extern rwlock_t tasklist_lock __attribute__((weak));
   7 read_lock(&tasklist_lock);
   8 ],
   9                        [EXPORTED_TASKLIST_LOCK],
  10                        [define if tasklist_lock exported])
  11 ])
  12
  13 AC_DEFUN([LINUX_COMPLETION_H_EXISTS], [
  14   AC_CHECK_LINUX_BUILD([for linux/completion.h],
  15                        [ac_cv_linux_completion_h_exists],
  16 [#include <linux/version.h>
  17 #include <linux/completion.h>],
  18 [struct completion _c;
  19 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,4,8)
  20 lose
  21 #endif],
  22                        [HAVE_LINUX_COMPLETION_H]
  23                        [Define if your kernel has a usable linux/completion.h])
  24 ])
  25
  26
  27 AC_DEFUN([LINUX_EXPORTS_INIT_MM], [
  28   AC_CHECK_LINUX_BUILD([for exported init_mm],
  29                        [ac_cv_linux_exports_init_mm],
  30                        [extern struct mm_struct init_mm;],
  31                        [void *address = &init_mm; printk("%p\n", address);],
  32                        [EXPORTED_INIT_MM],
  33                        [define if your kernel exports init_mm])
  34   ])
  35
  36
  37 AC_DEFUN([LINUX_EXPORTS_KALLSYMS_ADDRESS], [
  38   AC_CHECK_LINUX_BUILD([for exported kallsyms_address_to_symbol],
  39                        [ac_cv_linux_exports_kallsyms_address],
  40                        [#include <linux/modversions.h>],
  41 [#ifndef __ver_kallsyms_address_to_symbol
  42 #error kallsyms_address_to_symbol not exported
  43 #endif],
  44                        [EXPORTED_KALLSYMS_ADDRESS],
  45                        [define if your linux kernel exports kallsyms address])
  46 ])
  47
  48
  49 AC_DEFUN([LINUX_EXPORTS_KALLSYMS_SYMBOL], [
  50   AC_CHECK_LINUX_BUILD([for exported kallsyms_symbol_to_address],
  51                        [ac_cv_linux_exports_kallsyms_symbol],
  52                        [#include <linux/modversions.h>],
  53 [#ifndef __ver_kallsyms_symbol_to_address
  54 #error kallsyms_symbol_to_address not exported
  55 #endif],
  56                        [EXPORTED_KALLSYMS_SYMBOL],
  57                        [define if your linux kernel exports kallsyms])
  58 ])
  59
  60
  61 AC_DEFUN([LINUX_EXPORTS_SYS_CALL_TABLE], [
  62   AC_CHECK_LINUX_BUILD([for exported sys_call_table],
  63                        [ac_cv_linux_exports_sys_call_table],
  64                        [#include <linux/modversions.h>],
  65 [#ifndef __ver_sys_call_table
  66 #error sys_call_table not exported
  67 #endif],
  68                        [EXPORTED_SYS_CALL_TABLE],
  69                        [define if your linux kernel exports sys_call_table])
  70 ])
  71
  72
  73 AC_DEFUN([LINUX_EXPORTS_IA32_SYS_CALL_TABLE], [
  74   AC_CHECK_LINUX_BUILD([for exported ia32_sys_call_table],
  75                        [ac_cv_linux_exports_ia32_sys_call_table],
  76                        [#include <linux/modversions.h>],
  77 [#ifndef __ver_ia32_sys_call_table
  78 #error ia32_sys_call_table not exported
  79 #endif],
  80                        [EXPORTED_IA32_SYS_CALL_TABLE],
  81                        [define if your linux kernel exports ia32_sys_call_table])
  82 ])
  83
  84
  85 AC_DEFUN([LINUX_EXPORTS_SYS_CHDIR], [
  86   AC_CHECK_LINUX_BUILD([for exported sys_chdir],
  87                        [ac_cv_linux_exports_sys_chdir],
  88                        [extern asmlinkage long sys_chdir(void) __attribute__((weak));],
  89                        [void *address = &sys_chdir; printk("%p\n", address);],
  90                        [EXPORTED_SYS_CHDIR],
  91                        [define if your linux kernel exports sys_chdir])
  92 ])
  93
  94
  95 AC_DEFUN([LINUX_EXPORTS_SYS_OPEN], [
  96   AC_CHECK_LINUX_BUILD([for exported sys_open],
  97                        [ac_cv_linux_exports_sys_open],
  98                        [extern asmlinkage long sys_open(void) __attribute__((weak));],
  99                        [void *address = &sys_open; printk("%p\n", address);],
 100                        [EXPORTED_SYS_OPEN],
 101                        [define if your linux kernel exports sys_open])
 102 ])
 103
 104
 105 AC_DEFUN([LINUX_RECALC_SIGPENDING_ARG_TYPE], [
 106   AC_CHECK_LINUX_BUILD([for recalc_sigpending arg type],
 107                        [ac_cv_linux_func_recalc_sigpending_takes_void],
 108                        [#include <linux/sched.h>],
 109                        [recalc_sigpending();],
 110                        [RECALC_SIGPENDING_TAKES_VOID],
 111                        [define if your recalc_sigpending takes void])
 112 ])
 113
 114
 115 AC_DEFUN([LINUX_SCHED_STRUCT_TASK_STRUCT_HAS_SIGNAL_RLIM], [
 116   AC_CHECK_LINUX_BUILD([for signal->rlim in struct task_struct],
 117                        [ac_cv_linux_sched_struct_task_struct_has_signal_rlim],
 118                        [#include <linux/sched.h>],
 119                        [struct task_struct _tsk; printk("%d\n", _tsk.signal->rlim);],
 120                        [STRUCT_TASK_STRUCT_HAS_SIGNAL_RLIM],
 121                        [define if your struct task_struct has signal->rlim])
 122 ])
 123
 124
 125 AC_DEFUN([LINUX_KERNEL_POSIX_LOCK_FILE_WAIT_ARG], [
 126   AC_CHECK_LINUX_BUILD([for 3rd argument in posix_lock_file found in new kernels],
 127                        [ac_cv_linux_kernel_posix_lock_file_wait_arg],
 128                        [#include <linux/fs.h>],
 129                        [posix_lock_file(0,0,0);],
 130                        [POSIX_LOCK_FILE_WAIT_ARG],
 131                        [define if your kernel uses 3 arguments for posix_lock_file])
 132 ])
 133
 134 AC_DEFUN([LINUX_KERNEL_SOCK_CREATE], [
 135   AC_CHECK_LINUX_BUILD([for 5th argument in sock_create found in some SELinux kernels],
 136                        [ac_cv_linux_kernel_sock_create_v],
 137                        [#include <linux/net.h>],
 138                        [sock_create(0,0,0,0,0);],
 139                        [LINUX_KERNEL_SOCK_CREATE_V],
 140                        [define if your linux kernel uses 5 arguments for sock_create])
 141 ])
 142
 143
 144 AC_DEFUN([LINUX_INODE_SETATTR_RETURN_TYPE], [
 145   AC_CHECK_LINUX_BUILD([for inode_setattr return type],
 146                        [ac_cv_linux_func_inode_setattr_returns_int],
 147                        [#include <linux/fs.h>],
 148                        [struct inode _inode;
 149                         struct iattr _iattr;
 150                         int i;
 151                         i = inode_setattr(&_inode, &_iattr);],
 152                        [INODE_SETATTR_NOT_VOID],
 153                        [define if your setattr return return non-void])
 154 ])
 155
 156
 157
 158 AC_DEFUN([LINUX_AOP_WRITEBACK_CONTROL], [
 159   AC_CHECK_LINUX_BUILD([whether aop.writepage takes a writeback_control],
 160                        [ac_cv_linux_func_a_writepage_takes_writeback_control],
 161 [#include <linux/fs.h>
 162 #include <linux/mm.h>
 163 #include <linux/writeback.h>],
 164 [struct address_space_operations _aops;
 165 struct page _page;
 166 struct writeback_control _writeback_control;
 167 (void)_aops.writepage(&_page, &_writeback_control);],
 168                        [AOP_WRITEPAGE_TAKES_WRITEBACK_CONTROL],
 169                        [define if aops.writepage takes a struct writeback_control])
 170 ])
 171
 172
 173 AC_DEFUN([LINUX_REFRIGERATOR], [
 174   AC_CHECK_LINUX_BUILD([whether refrigerator takes PF_FREEZE],
 175                        [ac_cv_linux_func_refrigerator_takes_pf_freeze],
 176 [#include <linux/sched.h>
 177 #ifdef HAVE_LINUX_FREEZER_H
 178 #include <linux/freezer.h>
 179 #endif],
 180                        [refrigerator(PF_FREEZE);],
 181                        [LINUX_REFRIGERATOR_TAKES_PF_FREEZE],
 182                        [define if your refrigerator takes PF_FREEZE])
 183 ])
 184
 185
 186 AC_DEFUN([LINUX_IOP_I_CREATE_TAKES_NAMEIDATA], [
 187   AC_CHECK_LINUX_BUILD([whether inode_operations.create takes a nameidata],
 188                        [ac_cv_linux_func_i_create_takes_nameidata],
 189 [#include <linux/fs.h>
 190 #include <linux/namei.h>],
 191 [struct inode _inode;
 192 struct dentry _dentry;
 193 struct nameidata _nameidata;
 194 (void)_inode.i_op->create(&_inode, &_dentry, 0, &_nameidata);],
 195
 196                        [IOP_CREATE_TAKES_NAMEIDATA],
 197                        [define if your iops.create takes a nameidata argument])
 198 ])
 199
 200
 201 AC_DEFUN([LINUX_IOP_I_LOOKUP_TAKES_NAMEIDATA], [
 202   AC_CHECK_LINUX_BUILD([whether inode_operations.lookup takes a nameidata],
 203                        [ac_cv_linux_func_i_lookup_takes_nameidata],
 204 [#include <linux/fs.h>
 205 #include <linux/namei.h>],
 206 [struct inode _inode;
 207 struct dentry _dentry;
 208 struct nameidata _nameidata;
 209 (void)_inode.i_op->lookup(&_inode, &_dentry, &_nameidata);],
 210                        [IOP_LOOKUP_TAKES_NAMEIDATA],
 211                        [define if your iops.lookup takes a nameidata argument])
 212 ])
 213
 214
 215 AC_DEFUN([LINUX_IOP_I_PERMISSION_TAKES_NAMEIDATA], [
 216   AC_CHECK_LINUX_BUILD([whether inode_operations.permission takes a nameidata],
 217                        [ac_cv_linux_func_i_permission_takes_nameidata],
 218 [#include <linux/fs.h>
 219 #include <linux/namei.h>],
 220 [struct inode _inode;
 221 struct dentry _dentry;
 222 struct nameidata _nameidata;
 223 (void)_inode.i_op->permission(&_inode, 0, &_nameidata);],
 224                        [IOP_PERMISSION_TAKES_NAMEIDATA],
 225                        [define if your iops.permission takes a nameidata argument])
 226 ])
 227
 228
 229 AC_DEFUN([LINUX_IOP_I_PUT_LINK_TAKES_COOKIE], [
 230   AC_CHECK_LINUX_BUILD([whether inode_operations.put_link takes an opaque cookie],
 231                        [ac_cv_linux_func_i_put_link_takes_cookie],
 232 [#include <linux/fs.h>
 233 #include <linux/namei.h>],
 234 [struct inode _inode;
 235 struct dentry _dentry;
 236 struct nameidata _nameidata;
 237 void *cookie;
 238 (void)_inode.i_op->put_link(&_dentry, &_nameidata, cookie);],
 239                        [IOP_PUT_LINK_TAKES_COOKIE],
 240                        [define if your iops.put_link takes a cookie])
 241 ])
 242
 243
 244 AC_DEFUN([LINUX_DOP_D_REVALIDATE_TAKES_NAMEIDATA], [
 245   AC_CHECK_LINUX_BUILD([whether dentry_operations.d_revalidate takes a nameidata],
 246                        [ac_cv_linux_func_d_revalidate_takes_nameidata],
 247 [#include <linux/fs.h>
 248 #include <linux/namei.h>],
 249 [struct dentry _dentry;
 250 struct nameidata _nameidata;
 251 (void)_dentry.d_op->d_revalidate(&_dentry, &_nameidata);],
 252                        [DOP_REVALIDATE_TAKES_NAMEIDATA],
 253                        [define if your dops.d_revalidate takes a nameidata argument])
 254 ])
 255
 256
 257 AC_DEFUN([LINUX_GET_SB_HAS_STRUCT_VFSMOUNT], [
 258   AC_CHECK_LINUX_BUILD([for struct vfsmount * in get_sb_nodev()],
 259                        [ac_cv_linux_get_sb_has_struct_vfsmount],
 260                        [#include <linux/fs.h>],
 261                        [get_sb_nodev(0,0,0,0,0);],
 262                        [GET_SB_HAS_STRUCT_VFSMOUNT],
 263                        [define if your get_sb_nodev needs a struct vfsmount argument])
 264 ])
 265
 266
 267 AC_DEFUN([LINUX_STATFS_TAKES_DENTRY], [
 268   AC_CHECK_LINUX_BUILD([for dentry in statfs],
 269                        [ac_cv_linux_statfs_takes_dentry],
 270 [#include <linux/fs.h>
 271 #include <linux/statfs.h>],
 272 [struct super_block _sb;
 273 struct dentry _dentry;
 274 struct kstatfs _kstatfs;
 275 (void)_sb.s_op->statfs(&_dentry, &_kstatfs);],
 276                        [STATFS_TAKES_DENTRY],
 277                        [define if your statfs takes a dentry argument])
 278 ])
 279
 280
 281 AC_DEFUN([LINUX_LINUX_KEYRING_SUPPORT], [
 282   AC_CHECK_LINUX_BUILD([for linux kernel keyring support],
 283                        [ac_cv_linux_keyring_support],
 284 [#include <linux/rwsem.h>
 285 #ifdef HAVE_LINUX_KEY_TYPE_H
 286 #include <linux/key-type.h>
 287 #endif
 288 #include <linux/key.h>
 289 #include <linux/keyctl.h>],
 290 [#ifdef CONFIG_KEYS
 291 request_key(NULL, NULL, NULL);
 292 #if !defined(KEY_POS_VIEW) || !defined(KEY_POS_SEARCH) || !defined(KEY_POS_SETATTR)
 293 #error "Your linux/key.h does not contain KEY_POS_VIEW or KEY_POS_SEARCH or KEY_POS_SETATTR"
 294 #endif
 295 #else
 296 #error rebuild your kernel with CONFIG_KEYS
 297 #endif],
 298                        [LINUX_KEYRING_SUPPORT],
 299                        [define if your kernel has keyring support])
 300 ])
 301
 302
 303 AC_DEFUN([LINUX_KEY_ALLOC_NEEDS_STRUCT_TASK], [
 304   AC_CACHE_CHECK([if key_alloc() takes a struct task *],
 305                  [ac_cv_key_alloc_needs_struct_task],
 306 [
 307     save_CPPFLAGS="$CPPFLAGS"
 308     CPPFLAGS="$CPPFLAGS -Werror -Wno-pointer-arith"
 309     AC_TRY_KBUILD(
 310 [#include <linux/rwsem.h>
 311 #include <linux/key.h>
 312 ],
 313 [struct task_struct *t=NULL;
 314 (void) key_alloc(NULL, NULL, 0, 0, t, 0, 0);],
 315       ac_cv_key_alloc_needs_struct_task=yes,
 316       ac_cv_key_alloc_needs_struct_task=no)
 317     CPPFLAGS="$save_CPPFLAGS"])
 318   AS_IF([test "x$ac_cv_key_alloc_needs_struct_task" = "xyes"],
 319         [AC_DEFINE([KEY_ALLOC_NEEDS_STRUCT_TASK], 1,
 320                    [define if key_alloc takes a struct task *])])
 321 ])
 322
 323
 324 AC_DEFUN([LINUX_KEY_ALLOC_NEEDS_CRED], [
 325   AC_CACHE_CHECK([if key_alloc() takes credentials],
 326                   [ac_cv_key_alloc_needs_cred],
 327 [
 328     save_CPPFLAGS="$CPPFLAGS"
 329     CPPFLAGS="$CPPFLAGS -Werror -Wno-pointer-arith"
 330     AC_TRY_KBUILD(
 331 [#include <linux/rwsem.h>
 332 #include <linux/key.h>],
 333 [struct cred *c = NULL;
 334 (void) key_alloc(NULL, NULL, 0, 0, c, 0, 0);],
 335       ac_cv_key_alloc_needs_cred=yes,
 336       ac_cv_key_alloc_needs_cred=no)
 337     CPPFLAGS="$save_CPPFLAGS"])
 338   AS_IF([test "x$ac_cv_key_alloc_needs_cred" = "xyes"],
 339         [AC_DEFINE([KEY_ALLOC_NEEDS_CRED], 1,
 340                    [define if key_alloc takes credentials])])
 341 ])
 342
 343
 344 AC_DEFUN([LINUX_INIT_WORK_HAS_DATA], [
 345   AC_CHECK_LINUX_BUILD([whether INIT_WORK has a _data argument],
 346                        [ac_cv_linux_init_work_has_data],
 347 [#include <linux/kernel.h>
 348 #include <linux/workqueue.h>],
 349 [
 350 void f(struct work_struct *w) {}
 351 struct work_struct *w;
 352 int *i;
 353 INIT_WORK(w,f,i);],
 354                        [INIT_WORK_HAS_DATA],
 355                        [define if INIT_WORK takes a data (3rd) argument])
 356 ])
 357
 358
 359 AC_DEFUN([LINUX_REGISTER_SYSCTL_TABLE_NOFLAG], [
 360   AC_CHECK_LINUX_BUILD([whether register_sysctl_table has an insert_at_head argument],
 361                        [ac_cv_linux_register_sysctl_table_noflag],
 362                        [#include <linux/sysctl.h>],
 363                        [ctl_table *t; register_sysctl_table (t);],
 364                        [REGISTER_SYSCTL_TABLE_NOFLAG],
 365                        [define if register_sysctl_table has no insert_at head flag])
 366 ])
 367
 368
 369 AC_DEFUN([LINUX_FOP_F_FLUSH_TAKES_FL_OWNER_T], [
 370   AC_CHECK_LINUX_BUILD([whether file_operations.flush takes a fl_owner_t],
 371                        [ac_cv_linux_func_f_flush_takes_fl_owner_t],
 372                        [#include <linux/fs.h>],
 373 [struct inode _inode;
 374 struct file _file;
 375 fl_owner_t id;
 376 (void)_inode.i_fop->flush(&_file, &id);],
 377                        [FOP_FLUSH_TAKES_FL_OWNER_T],
 378                        [define if your fops.flush takes an fl_owner_t argument])
 379 ])
 380
 381
 382 AC_DEFUN([LINUX_FOP_F_FSYNC_TAKES_DENTRY], [
 383   AC_CHECK_LINUX_BUILD([whether file_operations.fsync takes a dentry argument],
 384                        [ac_cv_linux_func_f_fsync_takes_dentry],
 385                        [#include <linux/fs.h>],
 386 [struct inode _inode;
 387 struct file _file;
 388 struct dentry _d;
 389 (void)_inode.i_fop->fsync(&_file, &_d, 0);],
 390                        [FOP_FSYNC_TAKES_DENTRY],
 391                        [define if your fops.fsync takes an dentry argument])
 392 ])
 393
 394
 395 AC_DEFUN([LINUX_HAVE_KMEM_CACHE_T], [
 396   AC_CHECK_LINUX_BUILD([whether kmem_cache_t exists],
 397                        [ac_cv_linux_have_kmem_cache_t],
 398                        [#include <linux/slab.h>],
 399                        [kmem_cache_t *k;],
 400                        [HAVE_KMEM_CACHE_T],
 401                        [define if kmem_cache_t exists])
 402 ])
 403
 404
 405 AC_DEFUN([LINUX_KMEM_CACHE_CREATE_TAKES_DTOR], [
 406   AC_CHECK_LINUX_BUILD([whether kmem_cache_create takes a destructor argument],
 407                        [ac_cv_linux_kmem_cache_create_takes_dtor],
 408                        [#include <linux/slab.h>],
 409                        [kmem_cache_create(NULL, 0, 0, 0, NULL, NULL);],
 410                        [KMEM_CACHE_TAKES_DTOR],
 411                        [define if kmem_cache_create takes a destructor argument])
 412 ])
 413
 414
 415 AC_DEFUN([LINUX_KMEM_CACHE_CREATE_CTOR_TAKES_VOID],[
 416   AC_CACHE_CHECK([whether kmem_cache_create constructor takes a void pointer],
 417                  [ac_cv_linux_kmem_cache_create_ctor_takes_void], [
 418     save_CPPFLAGS="$CPPFLAGS"
 419     CPPFLAGS="$CPPFLAGS -Werror"
 420     AC_TRY_KBUILD([#include <linux/slab.h>],
 421                   [void _ctor(void *v) { }; kmem_cache_create(NULL, 0, 0, 0, _ctor);],
 422                   ac_cv_linux_kmem_cache_create_ctor_takes_void=yes,
 423                   ac_cv_linux_kmem_cache_create_ctor_takes_void=no)
 424     CPPFLAGS="$save_CPPFLAGS"
 425   ])
 426   AS_IF([test "x$ac_cv_linux_kmem_cache_create_ctor_takes_void" = "xyes"],
 427         [AC_DEFINE([KMEM_CACHE_CTOR_TAKES_VOID], 1,
 428                    [define if kmem_cache_create constructor takes a single void ptr])])
 429 ])
 430
 431
 432 dnl This function checks not just the existence of the splice functions,
 433 dnl but also that the signature matches (they gained an extra argument
 434 dnl around 2.6.17)
 435 AC_DEFUN([LINUX_FS_STRUCT_FOP_HAS_SPLICE], [
 436   AC_CHECK_LINUX_BUILD([for splice_write and splice_read in struct file_operations],
 437                        [ac_cv_linux_fs_struct_fop_has_splice],
 438                        [#include <linux/fs.h>],
 439                        [struct file_operations _fop;
 440                         _fop.splice_write(NULL, NULL, NULL, 0, 0);
 441                         _fop.splice_read(NULL, NULL, NULL, 0, 0);],
 442                        [STRUCT_FILE_OPERATIONS_HAS_SPLICE],
 443                        [define if struct file_operations has splice functions])
 444 ])
 445
 446
 447 AC_DEFUN([LINUX_KMEM_CACHE_INIT], [
 448   AC_CHECK_LINUX_BUILD([for new kmem_cache init function parameters],
 449                        [ac_cv_linux_kmem_cache_init],
 450                        [#include <linux/slab.h>],
 451                        [extern struct kmem_cache *
 452                         kmem_cache_create(const char *, size_t, size_t,
 453                                           unsigned long,
 454                                           void (*)(struct kmem_cache *, void *));
 455                         return;],
 456                        [KMEM_CACHE_INIT],
 457                        [define for new kmem_cache init function parameters])
 458 ])
 459
 460
 461 AC_DEFUN([LINUX_EXPORTS_PROC_ROOT_FS], [
 462   AC_CHECK_LINUX_BUILD([if proc_root_fs is defined and exported],
 463                        [ac_cv_linux_exports_proc_root_fs],
 464                        [#include <linux/proc_fs.h>],
 465                        [struct proc_dir_entry *p = proc_root_fs;],
 466                        [EXPORTED_PROC_ROOT_FS],
 467                        [define if proc_root_fs is exported])
 468 ])
 469
 470
 471 AC_DEFUN([LINUX_D_PATH_TAKES_STRUCT_PATH], [
 472   AC_CHECK_LINUX_BUILD([if d_path() takes a struct path argument],
 473                        [ac_cv_linux_d_path_takes_struct_path],
 474                        [#include <linux/dcache.h>],
 475                        [struct path *p; d_path(p, NULL, 0);],
 476                        [D_PATH_TAKES_STRUCT_PATH],
 477                        [define if d_path() takes a struct path argument])
 478 ])
 479
 480
 481 AC_DEFUN([LINUX_NEW_EXPORT_OPS], [
 482   AC_CHECK_LINUX_BUILD([if kernel uses new export ops],
 483                        [ac_cv_linux_new_export_ops],
 484                        [#include <linux/exportfs.h>],
 485                        [struct export_operations _eops;
 486                         _eops.fh_to_parent(NULL, NULL, 0, 0);],
 487                        [NEW_EXPORT_OPS],
 488                        [define if kernel uses new export ops])
 489 ])
 490
 491
 492 AC_DEFUN([LINUX_POSIX_TEST_LOCK_RETURNS_CONFLICT], [
 493   AC_CHECK_LINUX_BUILD([if posix_test_lock returns a struct file_lock],
 494                        [ac_cv_linux_posix_test_lock_returns_conflict],
 495                        [#include <linux/fs.h>],
 496                        [struct file_lock *lock;
 497                         struct file * file;
 498                         lock = posix_test_lock(file, lock);],
 499                        [POSIX_TEST_LOCK_RETURNS_CONFLICT],
 500                        [define if posix_test_lock returns the conflicting lock])
 501 ])
 502
 503
 504 AC_DEFUN([LINUX_POSIX_TEST_LOCK_CONFLICT_ARG], [
 505   AC_CHECK_LINUX_BUILD([if posix_test_lock takes a conflict argument],
 506                        [ac_cv_linux_posix_test_lock_conflict_arg],
 507                        [#include <linux/fs.h>],
 508                        [struct file_lock *lock;
 509                         struct file *file;
 510                         posix_test_lock(file, lock, lock);],
 511                        [POSIX_TEST_LOCK_CONFLICT_ARG],
 512                        [define if posix_test_lock takes a conflict argument])
 513 ])
 514
 515
 516 AC_DEFUN([LINUX_EXPORTS_KEY_TYPE_KEYRING], [
 517   AC_CHECK_LINUX_BUILD([for exported key_type_keyring],
 518                        [ac_cv_linux_exports_key_type_keyring],
 519 [
 520 #ifdef HAVE_LINUX_KEY_TYPE_H
 521 #include <linux/key-type.h>
 522 #endif
 523 #include <linux/key.h>
 524 ],
 525                        [printk("%s", key_type_keyring.name);],
 526                        [EXPORTED_KEY_TYPE_KEYRING],
 527                        [define if key_type_keyring is exported])
 528 ])
 529
 530
 531 AC_DEFUN([LINUX_HAVE_TRY_TO_FREEZE], [
 532   AC_CHECK_LINUX_BUILD([for try_to_freeze],
 533                        [ac_cv_linux_have_try_to_freeze],
 534 [#include <linux/sched.h>
 535 #ifdef HAVE_LINUX_FREEZER_H
 536 #include <linux/freezer.h>
 537 #endif],
 538 [#ifdef LINUX_REFRIGERATOR_TAKES_PF_FREEZE
 539    try_to_freeze(PF_FREEZE);
 540 #else
 541    try_to_freeze();
 542 #endif],
 543                        [HAVE_TRY_TO_FREEZE],
 544                        [define if your kernel has the try_to_freeze function])
 545 ])
 546