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
  14 AC_DEFUN([LINUX_COMPLETION_H_EXISTS], [
  15   AC_CHECK_LINUX_BUILD([for linux/completion.h],
  16                        [ac_cv_linux_completion_h_exists],
  17 [#include <linux/version.h>
  18 #include <linux/completion.h>],
  19 [struct completion _c;
  20 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,4,8)
  21 lose
  22 #endif],
  23                        [HAVE_LINUX_COMPLETION_H]
  24                        [Define if your kernel has a usable linux/completion.h],
  25                        [])
  26 ])
  27
  28
  29 AC_DEFUN([LINUX_EXPORTS_INIT_MM], [
  30   AC_CHECK_LINUX_BUILD([for exported init_mm],
  31                        [ac_cv_linux_exports_init_mm],
  32                        [extern struct mm_struct init_mm;],
  33                        [void *address = &init_mm; printk("%p\n", address);],
  34                        [EXPORTED_INIT_MM],
  35                        [define if your kernel exports init_mm],
  36                        [])
  37   ])
  38
  39
  40 AC_DEFUN([LINUX_EXPORTS_KALLSYMS_ADDRESS], [
  41   AC_CHECK_LINUX_BUILD([for exported kallsyms_address_to_symbol],
  42                        [ac_cv_linux_exports_kallsyms_address],
  43                        [#include <linux/modversions.h>],
  44 [#ifndef __ver_kallsyms_address_to_symbol
  45 #error kallsyms_address_to_symbol not exported
  46 #endif],
  47                        [EXPORTED_KALLSYMS_ADDRESS],
  48                        [define if your linux kernel exports kallsyms address],
  49                        [])
  50 ])
  51
  52
  53 AC_DEFUN([LINUX_EXPORTS_KALLSYMS_SYMBOL], [
  54   AC_CHECK_LINUX_BUILD([for exported kallsyms_symbol_to_address],
  55                        [ac_cv_linux_exports_kallsyms_symbol],
  56                        [#include <linux/modversions.h>],
  57 [#ifndef __ver_kallsyms_symbol_to_address
  58 #error kallsyms_symbol_to_address not exported
  59 #endif],
  60                        [EXPORTED_KALLSYMS_SYMBOL],
  61                        [define if your linux kernel exports kallsyms],
  62                        [])
  63 ])
  64
  65
  66 AC_DEFUN([LINUX_EXPORTS_SYS_CALL_TABLE], [
  67   AC_CHECK_LINUX_BUILD([for exported sys_call_table],
  68                        [ac_cv_linux_exports_sys_call_table],
  69                        [#include <linux/modversions.h>],
  70 [#ifndef __ver_sys_call_table
  71 #error sys_call_table not exported
  72 #endif],
  73                        [EXPORTED_SYS_CALL_TABLE],
  74                        [define if your linux kernel exports sys_call_table],
  75                        [])
  76 ])
  77
  78
  79 AC_DEFUN([LINUX_EXPORTS_IA32_SYS_CALL_TABLE], [
  80   AC_CHECK_LINUX_BUILD([for exported ia32_sys_call_table],
  81                        [ac_cv_linux_exports_ia32_sys_call_table],
  82                        [#include <linux/modversions.h>],
  83 [#ifndef __ver_ia32_sys_call_table
  84 #error ia32_sys_call_table not exported
  85 #endif],
  86                        [EXPORTED_IA32_SYS_CALL_TABLE],
  87                        [define if your linux kernel exports ia32_sys_call_table],
  88                        [])
  89 ])
  90
  91
  92 AC_DEFUN([LINUX_EXPORTS_SYS_CHDIR], [
  93   AC_CHECK_LINUX_BUILD([for exported sys_chdir],
  94                        [ac_cv_linux_exports_sys_chdir],
  95                        [extern asmlinkage long sys_chdir(void) __attribute__((weak));],
  96                        [void *address = &sys_chdir; printk("%p\n", address);],
  97                        [EXPORTED_SYS_CHDIR],
  98                        [define if your linux kernel exports sys_chdir],
  99                        [])
 100 ])
 101
 102
 103 AC_DEFUN([LINUX_EXPORTS_SYS_OPEN], [
 104   AC_CHECK_LINUX_BUILD([for exported sys_open],
 105                        [ac_cv_linux_exports_sys_open],
 106                        [extern asmlinkage long sys_open(void) __attribute__((weak));],
 107                        [void *address = &sys_open; printk("%p\n", address);],
 108                        [EXPORTED_SYS_OPEN],
 109                        [define if your linux kernel exports sys_open],
 110                        [])
 111 ])
 112
 113
 114 AC_DEFUN([LINUX_RECALC_SIGPENDING_ARG_TYPE], [
 115   AC_CHECK_LINUX_BUILD([for recalc_sigpending arg type],
 116                        [ac_cv_linux_func_recalc_sigpending_takes_void],
 117                        [#include <linux/sched.h>],
 118                        [recalc_sigpending();],
 119                        [RECALC_SIGPENDING_TAKES_VOID],
 120                        [define if your recalc_sigpending takes void],
 121                        [])
 122 ])
 123
 124
 125 AC_DEFUN([LINUX_SCHED_STRUCT_TASK_STRUCT_HAS_SIGNAL_RLIM], [
 126   AC_CHECK_LINUX_BUILD([for signal->rlim in struct task_struct],
 127                        [ac_cv_linux_sched_struct_task_struct_has_signal_rlim],
 128                        [#include <linux/sched.h>],
 129                        [struct task_struct _tsk; printk("%d\n", _tsk.signal->rlim);],
 130                        [STRUCT_TASK_STRUCT_HAS_SIGNAL_RLIM],
 131                        [define if your struct task_struct has signal->rlim],
 132                        [])
 133 ])
 134
 135
 136 AC_DEFUN([LINUX_KERNEL_POSIX_LOCK_FILE_WAIT_ARG], [
 137   AC_CHECK_LINUX_BUILD([for 3rd argument in posix_lock_file found in new kernels],
 138                        [ac_cv_linux_kernel_posix_lock_file_wait_arg],
 139                        [#include <linux/fs.h>],
 140                        [posix_lock_file(0,0,0);],
 141                        [POSIX_LOCK_FILE_WAIT_ARG],
 142                        [define if your kernel uses 3 arguments for posix_lock_file],
 143                        [])
 144 ])
 145
 146 AC_DEFUN([LINUX_KERNEL_SOCK_CREATE], [
 147   AC_CHECK_LINUX_BUILD([for 5th argument in sock_create found in some SELinux kernels],
 148                        [ac_cv_linux_kernel_sock_create_v],
 149                        [#include <linux/net.h>],
 150                        [sock_create(0,0,0,0,0);],
 151                        [LINUX_KERNEL_SOCK_CREATE_V],
 152                        [define if your linux kernel uses 5 arguments for sock_create],
 153                        [])
 154 ])
 155
 156
 157 AC_DEFUN([LINUX_INODE_SETATTR_RETURN_TYPE], [
 158   AC_CHECK_LINUX_BUILD([for inode_setattr return type],
 159                        [ac_cv_linux_func_inode_setattr_returns_int],
 160                        [#include <linux/fs.h>],
 161                        [struct inode _inode;
 162                         struct iattr _iattr;
 163                         int i;
 164                         i = inode_setattr(&_inode, &_iattr);],
 165                        [INODE_SETATTR_NOT_VOID],
 166                        [define if your setattr return return non-void],
 167                        [])
 168 ])
 169
 170
 171
 172 AC_DEFUN([LINUX_AOP_WRITEBACK_CONTROL], [
 173   AC_CHECK_LINUX_BUILD([whether aop.writepage takes a writeback_control],
 174                        [ac_cv_linux_func_a_writepage_takes_writeback_control],
 175 [#include <linux/fs.h>
 176 #include <linux/mm.h>
 177 #include <linux/writeback.h>],
 178 [struct address_space_operations _aops;
 179 struct page _page;
 180 struct writeback_control _writeback_control;
 181 (void)_aops.writepage(&_page, &_writeback_control);],
 182                        [AOP_WRITEPAGE_TAKES_WRITEBACK_CONTROL],
 183                        [define if aops.writepage takes a struct writeback_control],
 184                        [])
 185 ])
 186
 187
 188 AC_DEFUN([LINUX_REFRIGERATOR], [
 189   AC_CHECK_LINUX_BUILD([whether refrigerator takes PF_FREEZE],
 190                        [ac_cv_linux_func_refrigerator_takes_pf_freeze],
 191 [#include <linux/sched.h>
 192 #ifdef HAVE_LINUX_FREEZER_H
 193 #include <linux/freezer.h>
 194 #endif],
 195                        [refrigerator(PF_FREEZE);],
 196                        [LINUX_REFRIGERATOR_TAKES_PF_FREEZE],
 197                        [define if your refrigerator takes PF_FREEZE],
 198                        [])
 199 ])
 200
 201
 202 AC_DEFUN([LINUX_IOP_I_CREATE_TAKES_NAMEIDATA], [
 203   AC_CHECK_LINUX_BUILD([whether inode_operations.create takes a nameidata],
 204                        [ac_cv_linux_func_i_create_takes_nameidata],
 205 [#include <linux/fs.h>
 206 #include <linux/namei.h>],
 207 [struct inode _inode;
 208 struct dentry _dentry;
 209 struct nameidata _nameidata;
 210 (void)_inode.i_op->create(&_inode, &_dentry, 0, &_nameidata);],
 211
 212                        [IOP_CREATE_TAKES_NAMEIDATA],
 213                        [define if your iops.create takes a nameidata argument],
 214                        [])
 215 ])
 216
 217
 218 AC_DEFUN([LINUX_IOP_I_LOOKUP_TAKES_NAMEIDATA], [
 219   AC_CHECK_LINUX_BUILD([whether inode_operations.lookup takes a nameidata],
 220                        [ac_cv_linux_func_i_lookup_takes_nameidata],
 221 [#include <linux/fs.h>
 222 #include <linux/namei.h>],
 223 [struct inode _inode;
 224 struct dentry _dentry;
 225 struct nameidata _nameidata;
 226 (void)_inode.i_op->lookup(&_inode, &_dentry, &_nameidata);],
 227                        [IOP_LOOKUP_TAKES_NAMEIDATA],
 228                        [define if your iops.lookup takes a nameidata argument],
 229                        [])
 230 ])
 231
 232
 233 AC_DEFUN([LINUX_IOP_I_PERMISSION_TAKES_NAMEIDATA], [
 234   AC_CHECK_LINUX_BUILD([whether inode_operations.permission takes a nameidata],
 235                        [ac_cv_linux_func_i_permission_takes_nameidata],
 236 [#include <linux/fs.h>
 237 #include <linux/namei.h>],
 238 [struct inode _inode;
 239 struct nameidata _nameidata;
 240 (void)_inode.i_op->permission(&_inode, 0, &_nameidata);],
 241                        [IOP_PERMISSION_TAKES_NAMEIDATA],
 242                        [define if your iops.permission takes a nameidata argument],
 243                        [-Werror])
 244 ])
 245
 246
 247 AC_DEFUN([LINUX_IOP_I_PERMISSION_TAKES_FLAGS], [
 248   AC_CHECK_LINUX_BUILD([whether inode_operations.permission takes flags],
 249                         [ac_cv_linux_func_i_permission_takes_flags],
 250                         [#include <linux/fs.h>],
 251                         [struct inode _inode;
 252                         unsigned int flags = 0;
 253                         (void)_inode.i_op->permission(&_inode, 0, flags);],
 254                        [IOP_PERMISSION_TAKES_FLAGS],
 255                        [define if your iops.permission takes a flags argument],
 256                        [-Werror])
 257 ])
 258
 259
 260 AC_DEFUN([LINUX_IOP_I_PUT_LINK_TAKES_COOKIE], [
 261   AC_CHECK_LINUX_BUILD([whether inode_operations.put_link takes an opaque cookie],
 262                        [ac_cv_linux_func_i_put_link_takes_cookie],
 263 [#include <linux/fs.h>
 264 #include <linux/namei.h>],
 265 [struct inode _inode;
 266 struct dentry _dentry;
 267 struct nameidata _nameidata;
 268 void *cookie;
 269 (void)_inode.i_op->put_link(&_dentry, &_nameidata, cookie);],
 270                        [IOP_PUT_LINK_TAKES_COOKIE],
 271                        [define if your iops.put_link takes a cookie],
 272                        [])
 273 ])
 274
 275
 276 AC_DEFUN([LINUX_DOP_D_REVALIDATE_TAKES_NAMEIDATA], [
 277   AC_CHECK_LINUX_BUILD([whether dentry_operations.d_revalidate takes a nameidata],
 278                        [ac_cv_linux_func_d_revalidate_takes_nameidata],
 279 [#include <linux/fs.h>
 280 #include <linux/namei.h>],
 281 [struct dentry _dentry;
 282 struct nameidata _nameidata;
 283 (void)_dentry.d_op->d_revalidate(&_dentry, &_nameidata);],
 284                        [DOP_REVALIDATE_TAKES_NAMEIDATA],
 285                        [define if your dops.d_revalidate takes a nameidata argument],
 286                        [])
 287 ])
 288
 289
 290 AC_DEFUN([LINUX_GET_SB_HAS_STRUCT_VFSMOUNT], [
 291   AC_CHECK_LINUX_BUILD([for struct vfsmount * in get_sb_nodev()],
 292                        [ac_cv_linux_get_sb_has_struct_vfsmount],
 293                        [#include <linux/fs.h>],
 294                        [get_sb_nodev(0,0,0,0,0);],
 295                        [GET_SB_HAS_STRUCT_VFSMOUNT],
 296                        [define if your get_sb_nodev needs a struct vfsmount argument],
 297                        [])
 298 ])
 299
 300
 301 AC_DEFUN([LINUX_STATFS_TAKES_DENTRY], [
 302   AC_CHECK_LINUX_BUILD([for dentry in statfs],
 303                        [ac_cv_linux_statfs_takes_dentry],
 304 [#include <linux/fs.h>
 305 #include <linux/statfs.h>],
 306 [extern int simple_statfs(struct dentry *, struct kstatfs *);],
 307                        [STATFS_TAKES_DENTRY],
 308                        [define if your statfs takes a dentry argument],
 309                        [])
 310 ])
 311
 312
 313 AC_DEFUN([LINUX_LINUX_KEYRING_SUPPORT], [
 314   AC_CHECK_LINUX_BUILD([for linux kernel keyring support],
 315                        [ac_cv_linux_keyring_support],
 316 [#include <linux/rwsem.h>
 317 #ifdef HAVE_LINUX_KEY_TYPE_H
 318 #include <linux/key-type.h>
 319 #endif
 320 #include <linux/key.h>
 321 #include <linux/keyctl.h>],
 322 [#ifdef CONFIG_KEYS
 323 request_key(NULL, NULL, NULL);
 324 #if !defined(KEY_POS_VIEW) || !defined(KEY_POS_SEARCH) || !defined(KEY_POS_SETATTR)
 325 #error "Your linux/key.h does not contain KEY_POS_VIEW or KEY_POS_SEARCH or KEY_POS_SETATTR"
 326 #endif
 327 #else
 328 #error rebuild your kernel with CONFIG_KEYS
 329 #endif],
 330                        [LINUX_KEYRING_SUPPORT],
 331                        [define if your kernel has keyring support],
 332                        [])
 333 ])
 334
 335
 336 AC_DEFUN([LINUX_KEY_ALLOC_NEEDS_STRUCT_TASK], [
 337   AC_CHECK_LINUX_BUILD([if key_alloc() takes a struct task *],
 338                         [ac_cv_key_alloc_needs_struct_task],
 339                         [#include <linux/rwsem.h>
 340                         #include <linux/key.h> ],
 341                         [struct task_struct *t=NULL;
 342                         (void) key_alloc(NULL, NULL, 0, 0, t, 0, 0);],
 343                         [KEY_ALLOC_NEEDS_STRUCT_TASK],
 344                         [define if key_alloc takes a struct task *],
 345                         [-Werror -Wno-pointer-arith])
 346 ])
 347
 348
 349 AC_DEFUN([LINUX_KEY_ALLOC_NEEDS_CRED], [
 350   AC_CHECK_LINUX_BUILD([if key_alloc() takes credentials],
 351                         [ac_cv_key_alloc_needs_cred],
 352                         [#include <linux/rwsem.h>
 353                         #include <linux/key.h>],
 354                         [struct cred *c = NULL;
 355                         (void) key_alloc(NULL, NULL, 0, 0, c, 0, 0);],
 356                         [KEY_ALLOC_NEEDS_CRED],
 357                         [define if key_alloc takes credentials],
 358                         [-Werror -Wno-pointer-arith])
 359 ])
 360
 361
 362 AC_DEFUN([LINUX_INIT_WORK_HAS_DATA], [
 363   AC_CHECK_LINUX_BUILD([whether INIT_WORK has a _data argument],
 364                        [ac_cv_linux_init_work_has_data],
 365 [#include <linux/kernel.h>
 366 #include <linux/workqueue.h>],
 367 [
 368 void f(struct work_struct *w) {}
 369 struct work_struct *w;
 370 int *i;
 371 INIT_WORK(w,f,i);],
 372                        [INIT_WORK_HAS_DATA],
 373                        [define if INIT_WORK takes a data (3rd) argument],
 374                        [])
 375 ])
 376
 377
 378 AC_DEFUN([LINUX_REGISTER_SYSCTL_TABLE_NOFLAG], [
 379   AC_CHECK_LINUX_BUILD([whether register_sysctl_table has an insert_at_head argument],
 380                        [ac_cv_linux_register_sysctl_table_noflag],
 381                        [#include <linux/sysctl.h>],
 382                        [ctl_table *t; register_sysctl_table (t);],
 383                        [REGISTER_SYSCTL_TABLE_NOFLAG],
 384                        [define if register_sysctl_table has no insert_at head flag],
 385                        [])
 386 ])
 387
 388
 389 AC_DEFUN([LINUX_FOP_F_FLUSH_TAKES_FL_OWNER_T], [
 390   AC_CHECK_LINUX_BUILD([whether file_operations.flush takes a fl_owner_t],
 391                        [ac_cv_linux_func_f_flush_takes_fl_owner_t],
 392                        [#include <linux/fs.h>],
 393 [struct inode _inode;
 394 struct file _file;
 395 fl_owner_t id;
 396 (void)_inode.i_fop->flush(&_file, &id);],
 397                        [FOP_FLUSH_TAKES_FL_OWNER_T],
 398                        [define if your fops.flush takes an fl_owner_t argument],
 399                        [])
 400 ])
 401
 402
 403 AC_DEFUN([LINUX_FOP_F_FSYNC_TAKES_DENTRY], [
 404   AC_CHECK_LINUX_BUILD([whether file_operations.fsync takes a dentry argument],
 405                        [ac_cv_linux_func_f_fsync_takes_dentry],
 406                        [#include <linux/fs.h>],
 407 [struct inode _inode;
 408 struct file _file;
 409 struct dentry _d;
 410 (void)_inode.i_fop->fsync(&_file, &_d, 0);],
 411                        [FOP_FSYNC_TAKES_DENTRY],
 412                        [define if your fops.fsync takes an dentry argument],
 413                        [])
 414 ])
 415
 416
 417 AC_DEFUN([LINUX_HAVE_KMEM_CACHE_T], [
 418   AC_CHECK_LINUX_BUILD([whether kmem_cache_t exists],
 419                        [ac_cv_linux_have_kmem_cache_t],
 420                        [#include <linux/slab.h>],
 421                        [kmem_cache_t *k;],
 422                        [HAVE_KMEM_CACHE_T],
 423                        [define if kmem_cache_t exists],
 424                        [])
 425 ])
 426
 427
 428 AC_DEFUN([LINUX_KMEM_CACHE_CREATE_TAKES_DTOR], [
 429   AC_CHECK_LINUX_BUILD([whether kmem_cache_create takes a destructor argument],
 430                        [ac_cv_linux_kmem_cache_create_takes_dtor],
 431                        [#include <linux/slab.h>],
 432                        [kmem_cache_create(NULL, 0, 0, 0, NULL, NULL);],
 433                        [KMEM_CACHE_TAKES_DTOR],
 434                        [define if kmem_cache_create takes a destructor argument],
 435                        [])
 436 ])
 437
 438
 439 AC_DEFUN([LINUX_KMEM_CACHE_CREATE_CTOR_TAKES_VOID],[
 440   AC_CHECK_LINUX_BUILD([whether kmem_cache_create constructor takes a void pointer],
 441                         [ac_cv_linux_kmem_cache_create_ctor_takes_void],
 442                         [#include <linux/slab.h>],
 443                         [void _ctor(void *v) { }; kmem_cache_create(NULL, 0, 0, 0, _ctor);],
 444                         [KMEM_CACHE_CTOR_TAKES_VOID],
 445                         [define if kmem_cache_create constructor takes a single void ptr],
 446                         [-Werror])
 447 ])
 448
 449
 450 dnl This function checks not just the existence of the splice functions,
 451 dnl but also that the signature matches (they gained an extra argument
 452 dnl around 2.6.17)
 453 AC_DEFUN([LINUX_FS_STRUCT_FOP_HAS_SPLICE], [
 454   AC_CHECK_LINUX_BUILD([for splice_write and splice_read in struct file_operations],
 455                        [ac_cv_linux_fs_struct_fop_has_splice],
 456                        [#include <linux/fs.h>],
 457                        [struct file_operations _fop;
 458                         _fop.splice_write(NULL, NULL, NULL, 0, 0);
 459                         _fop.splice_read(NULL, NULL, NULL, 0, 0);],
 460                        [STRUCT_FILE_OPERATIONS_HAS_SPLICE],
 461                        [define if struct file_operations has splice functions],
 462                        [])
 463 ])
 464
 465
 466 AC_DEFUN([LINUX_KMEM_CACHE_INIT], [
 467   AC_CHECK_LINUX_BUILD([for new kmem_cache init function parameters],
 468                        [ac_cv_linux_kmem_cache_init],
 469                        [#include <linux/slab.h>],
 470                        [extern struct kmem_cache *
 471                         kmem_cache_create(const char *, size_t, size_t,
 472                                           unsigned long,
 473                                           void (*)(struct kmem_cache *, void *));
 474                         return;],
 475                        [KMEM_CACHE_INIT],
 476                        [define for new kmem_cache init function parameters],
 477                        [])
 478 ])
 479
 480
 481 AC_DEFUN([LINUX_EXPORTS_PROC_ROOT_FS], [
 482   AC_CHECK_LINUX_BUILD([if proc_root_fs is defined and exported],
 483                        [ac_cv_linux_exports_proc_root_fs],
 484                        [#include <linux/proc_fs.h>],
 485                        [struct proc_dir_entry *p = proc_root_fs;],
 486                        [EXPORTED_PROC_ROOT_FS],
 487                        [define if proc_root_fs is exported],
 488                        [])
 489 ])
 490
 491
 492 AC_DEFUN([LINUX_D_PATH_TAKES_STRUCT_PATH], [
 493   AC_CHECK_LINUX_BUILD([if d_path() takes a struct path argument],
 494                        [ac_cv_linux_d_path_takes_struct_path],
 495                        [#include <linux/dcache.h>],
 496                        [struct path *p; d_path(p, NULL, 0);],
 497                        [D_PATH_TAKES_STRUCT_PATH],
 498                        [define if d_path() takes a struct path argument],
 499                        [])
 500 ])
 501
 502
 503 AC_DEFUN([LINUX_NEW_EXPORT_OPS], [
 504   AC_CHECK_LINUX_BUILD([if kernel uses new export ops],
 505                        [ac_cv_linux_new_export_ops],
 506                        [#include <linux/exportfs.h>],
 507                        [struct export_operations _eops;
 508                         _eops.fh_to_parent(NULL, NULL, 0, 0);],
 509                        [NEW_EXPORT_OPS],
 510                        [define if kernel uses new export ops],
 511                        [])
 512 ])
 513
 514
 515 AC_DEFUN([LINUX_POSIX_TEST_LOCK_RETURNS_CONFLICT], [
 516   AC_CHECK_LINUX_BUILD([if posix_test_lock returns a struct file_lock],
 517                        [ac_cv_linux_posix_test_lock_returns_conflict],
 518                        [#include <linux/fs.h>],
 519                        [struct file_lock *lock;
 520                         struct file * file;
 521                         lock = posix_test_lock(file, lock);],
 522                        [POSIX_TEST_LOCK_RETURNS_CONFLICT],
 523                        [define if posix_test_lock returns the conflicting lock],
 524                        [])
 525 ])
 526
 527
 528 AC_DEFUN([LINUX_POSIX_TEST_LOCK_CONFLICT_ARG], [
 529   AC_CHECK_LINUX_BUILD([if posix_test_lock takes a conflict argument],
 530                        [ac_cv_linux_posix_test_lock_conflict_arg],
 531                        [#include <linux/fs.h>],
 532                        [struct file_lock *lock;
 533                         struct file *file;
 534                         posix_test_lock(file, lock, lock);],
 535                        [POSIX_TEST_LOCK_CONFLICT_ARG],
 536                        [define if posix_test_lock takes a conflict argument],
 537                        [])
 538 ])
 539
 540
 541 AC_DEFUN([LINUX_EXPORTS_KEY_TYPE_KEYRING], [
 542   AC_CHECK_LINUX_BUILD([for exported key_type_keyring],
 543                        [ac_cv_linux_exports_key_type_keyring],
 544 [
 545 #ifdef HAVE_LINUX_KEY_TYPE_H
 546 #include <linux/key-type.h>
 547 #endif
 548 #include <linux/key.h>
 549 ],
 550                        [printk("%s", key_type_keyring.name);],
 551                        [EXPORTED_KEY_TYPE_KEYRING],
 552                        [define if key_type_keyring is exported],
 553                        [])
 554 ])
 555
 556
 557 AC_DEFUN([LINUX_HAVE_TRY_TO_FREEZE], [
 558   AC_CHECK_LINUX_BUILD([for try_to_freeze],
 559                        [ac_cv_linux_have_try_to_freeze],
 560 [#include <linux/sched.h>
 561 #ifdef HAVE_LINUX_FREEZER_H
 562 #include <linux/freezer.h>
 563 #endif],
 564 [#ifdef LINUX_REFRIGERATOR_TAKES_PF_FREEZE
 565    try_to_freeze(PF_FREEZE);
 566 #else
 567    try_to_freeze();
 568 #endif],
 569                        [HAVE_TRY_TO_FREEZE],
 570                        [define if your kernel has the try_to_freeze function],
 571                        [])
 572 ])
 573
 574
 575 AC_DEFUN([LINUX_HAVE_DCACHE_LOCK], [
 576   AC_CHECK_LINUX_BUILD([for dcache_lock],
 577                         [ac_cv_linux_have_dcache_lock],
 578                         [#include <linux/dcache.h> ],
 579                         [printk("%p", &dcache_lock);],
 580                         [HAVE_DCACHE_LOCK],
 581                         [define if dcache_lock exists],
 582                         [])
 583 ])
 584