config/kernel-timer.m4

   1 dnl # 4.14-rc3 API change
   2 dnl # https://lwn.net/Articles/735887/
   3 dnl #
   4 dnl # Check if timer_list.func get passed a timer_list or an unsigned long
   5 dnl # (older kernels).  Also sanity check the from_timer() and timer_setup()
   6 dnl # macros are available as well, since they will be used in the same newer
   7 dnl # kernels that support the new timer_list.func signature.
   8 dnl #
   9 dnl # Also check for the existence of flags in struct timer_list, they were
  10 dnl # added in 4.1-rc8 via 0eeda71bc30d.
  11 dnl #
  12 AC_DEFUN([ZFS_AC_KERNEL_SRC_TIMER_SETUP], [
  13         ZFS_LINUX_TEST_SRC([timer_setup], [
  14                 #include <linux/timer.h>
  15
  16                 struct my_task_timer {
  17                         struct timer_list timer;
  18                         int data;
  19                 };
  20
  21                 void task_expire(struct timer_list *tl)
  22                 {
  23                         struct my_task_timer *task_timer =
  24                             from_timer(task_timer, tl, timer);
  25                         task_timer->data = 42;
  26                 }
  27         ],[
  28                 struct my_task_timer task_timer;
  29                 timer_setup(&task_timer.timer, task_expire, 0);
  30         ])
  31
  32         ZFS_LINUX_TEST_SRC([timer_list_function], [
  33                 #include <linux/timer.h>
  34                 void task_expire(struct timer_list *tl) {}
  35         ],[
  36                 struct timer_list tl;
  37                 tl.function = task_expire;
  38         ])
  39
  40         ZFS_LINUX_TEST_SRC([timer_list_flags], [
  41                 #include <linux/timer.h>
  42         ],[
  43                 struct timer_list tl;
  44                 tl.flags = 2;
  45         ])
  46 ])
  47
  48 AC_DEFUN([ZFS_AC_KERNEL_TIMER_SETUP], [
  49         AC_MSG_CHECKING([whether timer_setup() is available])
  50         ZFS_LINUX_TEST_RESULT([timer_setup], [
  51                 AC_MSG_RESULT(yes)
  52                 AC_DEFINE(HAVE_KERNEL_TIMER_SETUP, 1,
  53                     [timer_setup() is available])
  54         ],[
  55                 AC_MSG_RESULT(no)
  56         ])
  57
  58         AC_MSG_CHECKING([whether timer function expects timer_list])
  59         ZFS_LINUX_TEST_RESULT([timer_list_function], [
  60                 AC_MSG_RESULT(yes)
  61                 AC_DEFINE(HAVE_KERNEL_TIMER_FUNCTION_TIMER_LIST, 1,
  62                     [timer_list.function gets a timer_list])
  63         ],[
  64                 AC_MSG_RESULT(no)
  65         ])
  66
  67         AC_MSG_CHECKING([whether struct timer_list has flags])
  68         ZFS_LINUX_TEST_RESULT([timer_list_flags], [
  69                 AC_MSG_RESULT(yes)
  70                 AC_DEFINE(HAVE_KERNEL_TIMER_LIST_FLAGS, 1,
  71                     [struct timer_list has a flags member])
  72         ],[
  73                 AC_MSG_RESULT(no)
  74         ])
  75 ])