4 AC_DEFUN([ZFS_AC_KERNEL_RQ_IS_SYNC], [
5 AC_MSG_CHECKING([whether rq_is_sync() is available])
6 tmp_flags="$EXTRA_KCFLAGS"
7 EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
8 ZFS_LINUX_TRY_COMPILE([
9 #include <linux/blkdev.h>
11 struct request *req = NULL;
12 (void) rq_is_sync(req);
15 AC_DEFINE(HAVE_RQ_IS_SYNC, 1,
16 [rq_is_sync() is available])
20 EXTRA_KCFLAGS="$tmp_flags"