config/kernel-rq-for-each_segment.m4

   1 dnl #
   2 dnl # 2.6.x API change
   3 dnl #
   4 AC_DEFUN([ZFS_AC_KERNEL_RQ_FOR_EACH_SEGMENT], [
   5         AC_MSG_CHECKING([whether rq_for_each_segment() is available])
   6         tmp_flags="$EXTRA_KCFLAGS"
   7         EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
   8         ZFS_LINUX_TRY_COMPILE([
   9                 #include <linux/blkdev.h>
  10         ],[
  11                 struct bio_vec *bv;
  12                 struct req_iterator iter;
  13                 struct request *req = NULL;
  14                 rq_for_each_segment(bv, req, iter) { }
  15         ],[
  16                 AC_MSG_RESULT(yes)
  17                 AC_DEFINE(HAVE_RQ_FOR_EACH_SEGMENT, 1,
  18                           [rq_for_each_segment() is available])
  19         ],[
  20                 AC_MSG_RESULT(no)
  21         ])
  22         EXTRA_KCFLAGS="$tmp_flags"
  23 ])