2 dnl # 2.6.36 API compatibility.
3 dnl # Added usleep_range timer.
4 dnl # usleep_range is a finer precision implementation of msleep
5 dnl # designed to be a drop-in replacement for udelay where a precise
6 dnl # sleep / busy-wait is unnecessary.
8 AC_DEFUN([SPL_AC_USLEEP_RANGE], [
9 AC_MSG_CHECKING([whether usleep_range() is available])
10 SPL_LINUX_TRY_COMPILE([
11 #include <linux/delay.h>
16 AC_DEFINE(HAVE_USLEEP_RANGE, 1,
17 [usleep_range is available])