config/kernel-bio-empty-barrier.m4

   1 dnl #
   2 dnl # 2.6.24 API change
   3 dnl # Empty write barriers are now supported and we should use them.
   4 dnl #
   5 AC_DEFUN([ZFS_AC_KERNEL_BIO_EMPTY_BARRIER], [
   6         AC_MSG_CHECKING([whether bio_empty_barrier() is defined])
   7         EXTRA_KCFLAGS="-Werror"
   8         ZFS_LINUX_TRY_COMPILE([
   9                 #include <linux/bio.h>
  10         ],[
  11                 struct bio bio;
  12                 (void)bio_empty_barrier(&bio);
  13         ],[
  14                 AC_MSG_RESULT(yes)
  15                 AC_DEFINE(HAVE_BIO_EMPTY_BARRIER, 1,
  16                           [bio_empy_barrier() is defined])
  17         ],[
  18                 AC_MSG_RESULT(no)
  19         ])
  20 ])