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dnl #
dnl # 2.6.32-2.6.35 API - The BIO_RW_UNPLUG enum can be used as a hint
dnl # to unplug the queue.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_HAVE_BIO_RW_UNPLUG], [
AC_MSG_CHECKING([whether the BIO_RW_UNPLUG enum is available])
tmp_flags="$EXTRA_KCFLAGS"
EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
ZFS_LINUX_TRY_COMPILE([
#include <linux/blkdev.h>
],[
extern enum bio_rw_flags rw;
rw = BIO_RW_UNPLUG;
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_BLK_QUEUE_HAVE_BIO_RW_UNPLUG, 1,
[BIO_RW_UNPLUG is available])
],[
AC_MSG_RESULT(no)
])
EXTRA_KCFLAGS="$tmp_flags"
])
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