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dnl #
dnl # 2.6.36 API compatibility.
dnl # Added usleep_range timer.
dnl # usleep_range is a finer precision implementation of msleep
dnl # designed to be a drop-in replacement for udelay where a precise
dnl # sleep / busy-wait is unnecessary.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_USLEEP_RANGE], [
AC_MSG_CHECKING([whether usleep_range() is available])
ZFS_LINUX_TRY_COMPILE([
#include <linux/delay.h>
],[
usleep_range(0, 0);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_USLEEP_RANGE, 1,
[usleep_range is available])
],[
AC_MSG_RESULT(no)
])
])
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