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dnl #
dnl # 2.6.24 API change
dnl # Empty write barriers are now supported and we should use them.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_BIO_EMPTY_BARRIER], [
AC_MSG_CHECKING([whether bio_empty_barrier() is defined])
EXTRA_KCFLAGS="-Werror"
ZFS_LINUX_TRY_COMPILE([
#include <linux/bio.h>
],[
struct bio bio;
(void)bio_empty_barrier(&bio);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_BIO_EMPTY_BARRIER, 1,
[bio_empy_barrier() is defined])
],[
AC_MSG_RESULT(no)
])
])
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