config/kernel-wait.m4

   1 dnl #
   2 dnl # 4.13 API change
   3 dnl # Renamed struct wait_queue -> struct wait_queue_entry.
   4 dnl #
   5 dnl # N.B. The type check is performed before all other checks
   6 dnl # since ZFS_AC_KERNEL_SRC_WAIT_QUEUE_HEAD_ENTRY depends on
   7 dnl # HAVE_WAIT_QUEUE_ENTRY_T being set in confdefs.h.
   8 dnl #
   9 AC_DEFUN([ZFS_AC_KERNEL_WAIT_QUEUE_ENTRY_T], [
  10         AC_MSG_CHECKING([whether wait_queue_entry_t exists])
  11         ZFS_LINUX_TRY_COMPILE([
  12                 #include <linux/wait.h>
  13         ],[
  14                 wait_queue_entry_t *entry __attribute__ ((unused));
  15         ],[
  16                 AC_MSG_RESULT(yes)
  17                 AC_DEFINE(HAVE_WAIT_QUEUE_ENTRY_T, 1,
  18                     [wait_queue_entry_t exists])
  19         ],[
  20                 AC_MSG_RESULT(no)
  21         ])
  22 ])
  23
  24 dnl #
  25 dnl # 3.17 API change,
  26 dnl # wait_on_bit() no longer requires an action argument. The former
  27 dnl # "wait_on_bit" interface required an 'action' function to be provided
  28 dnl # which does the actual waiting. There were over 20 such functions in the
  29 dnl # kernel, many of them identical, though most cases can be satisfied by one
  30 dnl # of just two functions: one which uses io_schedule() and one which just
  31 dnl # uses schedule().  This API change was made to consolidate all of those
  32 dnl # redundant wait functions.
  33 dnl #
  34 AC_DEFUN([ZFS_AC_KERNEL_SRC_WAIT_ON_BIT], [
  35         ZFS_LINUX_TEST_SRC([wait_on_bit], [
  36                 #include <linux/wait.h>
  37         ],[
  38                 int (*action)(void *) = NULL;
  39                 wait_on_bit(NULL, 0, action, 0);
  40         ])
  41 ])
  42
  43 AC_DEFUN([ZFS_AC_KERNEL_WAIT_ON_BIT], [
  44         AC_MSG_CHECKING([whether wait_on_bit() takes an action])
  45         ZFS_LINUX_TEST_RESULT([wait_on_bit], [
  46                 AC_MSG_RESULT(yes)
  47                 AC_DEFINE(HAVE_WAIT_ON_BIT_ACTION, 1, [yes])
  48         ],[
  49                 AC_MSG_RESULT(no)
  50         ])
  51 ])
  52
  53 dnl #
  54 dnl # 4.13 API change
  55 dnl # Renamed wait_queue_head::task_list -> wait_queue_head::head
  56 dnl # Renamed wait_queue_entry::task_list -> wait_queue_entry::entry
  57 dnl #
  58 AC_DEFUN([ZFS_AC_KERNEL_SRC_WAIT_QUEUE_HEAD_ENTRY], [
  59         ZFS_LINUX_TEST_SRC([wait_queue_head_entry], [
  60                 #include <linux/wait.h>
  61
  62                 #ifdef HAVE_WAIT_QUEUE_ENTRY_T
  63                 typedef wait_queue_head_t       spl_wait_queue_head_t;
  64                 typedef wait_queue_entry_t      spl_wait_queue_entry_t;
  65                 #else
  66                 typedef wait_queue_head_t       spl_wait_queue_head_t;
  67                 typedef wait_queue_t            spl_wait_queue_entry_t;
  68                 #endif
  69         ],[
  70                 spl_wait_queue_head_t wq_head;
  71                 spl_wait_queue_entry_t wq_entry;
  72                 struct list_head *head __attribute__ ((unused));
  73                 struct list_head *entry __attribute__ ((unused));
  74
  75                 head = &wq_head.head;
  76                 entry = &wq_entry.entry;
  77         ])
  78 ])
  79
  80 AC_DEFUN([ZFS_AC_KERNEL_WAIT_QUEUE_HEAD_ENTRY], [
  81         AC_MSG_CHECKING([whether wq_head->head and wq_entry->entry exist])
  82         ZFS_LINUX_TEST_RESULT([wait_queue_head_entry], [
  83                 AC_MSG_RESULT(yes)
  84                 AC_DEFINE(HAVE_WAIT_QUEUE_HEAD_ENTRY, 1,
  85                     [wq_head->head and wq_entry->entry exist])
  86         ],[
  87                 AC_MSG_RESULT(no)
  88         ])
  89 ])
  90
  91 AC_DEFUN([ZFS_AC_KERNEL_SRC_WAIT], [
  92         ZFS_AC_KERNEL_SRC_WAIT_ON_BIT
  93         ZFS_AC_KERNEL_SRC_WAIT_QUEUE_HEAD_ENTRY
  94 ])
  95
  96 AC_DEFUN([ZFS_AC_KERNEL_WAIT], [
  97         ZFS_AC_KERNEL_WAIT_ON_BIT
  98         ZFS_AC_KERNEL_WAIT_QUEUE_HEAD_ENTRY
  99 ])