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dnl #
dnl # 2.6.36 API, exported elevator_change() symbol
dnl # 4.12 API, removed elevator_change() symbol
dnl #
AC_DEFUN([ZFS_AC_KERNEL_ELEVATOR_CHANGE], [
AC_MSG_CHECKING([whether elevator_change() is available])
tmp_flags="$EXTRA_KCFLAGS"
EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
ZFS_LINUX_TRY_COMPILE([
#include <linux/blkdev.h>
#include <linux/elevator.h>
],[
int ret;
struct request_queue *q = NULL;
char *elevator = NULL;
ret = elevator_change(q, elevator);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_ELEVATOR_CHANGE, 1,
[elevator_change() is available])
],[
AC_MSG_RESULT(no)
])
EXTRA_KCFLAGS="$tmp_flags"
])
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