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dnl #
dnl # 2.6.30 API change
dnl # The blk_queue_io_opt() function was added to indicate the optimal
dnl # I/O size for the device.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_IO_OPT], [
AC_MSG_CHECKING([whether blk_queue_io_opt() is available])
tmp_flags="$EXTRA_KCFLAGS"
EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
ZFS_LINUX_TRY_COMPILE([
#include <linux/blkdev.h>
],[
struct request_queue *q = NULL;
unsigned int opt = 1;
(void) blk_queue_io_opt(q, opt);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_BLK_QUEUE_IO_OPT, 1,
[blk_queue_io_opt() is available])
],[
AC_MSG_RESULT(no)
])
EXTRA_KCFLAGS="$tmp_flags"
])
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