config: remove HAVE_KERNEL_TIMER_FUNCTION_TIMER_LIST

Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes openzfs#16479

config/kernel-timer.m4

@@ -28,14 +28,6 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_TIMER_SETUP], [
 		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>
-		static void task_expire(struct timer_list *tl) {}
-	],[
-		struct timer_list tl;
-		tl.function = task_expire;
-	])
 ])
 
 AC_DEFUN([ZFS_AC_KERNEL_TIMER_SETUP], [
@@ -47,13 +39,4 @@ AC_DEFUN([ZFS_AC_KERNEL_TIMER_SETUP], [
 	],[
 		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)
-	])
 ])

include/os/linux/spl/sys/timer.h

@@ -62,11 +62,7 @@
 	container_of(timer, typeof(*var), timer_field)
 #endif
 
-#ifdef HAVE_KERNEL_TIMER_FUNCTION_TIMER_LIST
 typedef struct timer_list *spl_timer_list_t;
-#else
-typedef unsigned long spl_timer_list_t;
-#endif
 
 #ifndef HAVE_KERNEL_TIMER_SETUP