1 files changed, 75 insertions, 0 deletions
diff --git a/config/kernel-timer.m4 b/config/kernel-timer.m4
new file mode 100644
index 000000000000..403cff3f4189
--- /dev/null
+++ b/config/kernel-timer.m4
@@ -0,0 +1,75 @@
+dnl # 4.14-rc3 API change
+dnl # https://lwn.net/Articles/735887/
+dnl #
+dnl # Check if timer_list.func get passed a timer_list or an unsigned long
+dnl # (older kernels).  Also sanity check the from_timer() and timer_setup()
+dnl # macros are available as well, since they will be used in the same newer
+dnl # kernels that support the new timer_list.func signature.
+dnl #
+dnl # Also check for the existence of flags in struct timer_list, they were
+dnl # added in 4.1-rc8 via 0eeda71bc30d.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_TIMER_SETUP], [
+	ZFS_LINUX_TEST_SRC([timer_setup], [
+		#include <linux/timer.h>
+
+		struct my_task_timer {
+			struct timer_list timer;
+			int data;
+		};
+
+		void task_expire(struct timer_list *tl)
+		{
+			struct my_task_timer *task_timer =
+			    from_timer(task_timer, tl, timer);
+			task_timer->data = 42;
+		}
+	],[
+		struct my_task_timer task_timer;
+		timer_setup(&task_timer.timer, task_expire, 0);
+	])
+
+	ZFS_LINUX_TEST_SRC([timer_list_function], [
+		#include <linux/timer.h>
+		void task_expire(struct timer_list *tl) {}
+	],[
+		struct timer_list tl;
+		tl.function = task_expire;
+	])
+
+	ZFS_LINUX_TEST_SRC([timer_list_flags], [
+		#include <linux/timer.h>
+	],[
+		struct timer_list tl;
+		tl.flags = 2;
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_TIMER_SETUP], [
+	AC_MSG_CHECKING([whether timer_setup() is available])
+	ZFS_LINUX_TEST_RESULT([timer_setup], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_KERNEL_TIMER_SETUP, 1,
+		    [timer_setup() is available])
+	],[
+		AC_MSG_RESULT(no)
+	])
+
+	AC_MSG_CHECKING([whether timer function expects timer_list])
+	ZFS_LINUX_TEST_RESULT([timer_list_function], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_KERNEL_TIMER_FUNCTION_TIMER_LIST, 1,
+		    [timer_list.function gets a timer_list])
+	],[
+		AC_MSG_RESULT(no)
+	])
+
+	AC_MSG_CHECKING([whether struct timer_list has flags])
+	ZFS_LINUX_TEST_RESULT([timer_list_flags], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_KERNEL_TIMER_LIST_FLAGS, 1,
+		    [struct timer_list has a flags member])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])