/usr/src/zfs-0.6.5.6/config/kernel-bdi-setup-and-register.m4 is in zfs-dkms 0.6.5.6-0ubuntu8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 | dnl #
dnl # 2.6.32 - 2.6.33, bdi_setup_and_register() is not exported.
dnl # 2.6.34 - 3.19, bdi_setup_and_register() takes 3 arguments.
dnl # 4.0 - x.y, bdi_setup_and_register() takes 2 arguments.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER], [
AC_MSG_CHECKING([whether bdi_setup_and_register() wants 2 args])
ZFS_LINUX_TRY_COMPILE_SYMBOL([
#include <linux/backing-dev.h>
struct backing_dev_info bdi;
], [
char *name = "bdi";
int error __attribute__((unused)) =
bdi_setup_and_register(&bdi, name);
], [bdi_setup_and_register], [mm/backing-dev.c], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_2ARGS_BDI_SETUP_AND_REGISTER, 1,
[bdi_setup_and_register() wants 2 args])
], [
AC_MSG_RESULT(no)
AC_MSG_CHECKING([whether bdi_setup_and_register() wants 3 args])
ZFS_LINUX_TRY_COMPILE_SYMBOL([
#include <linux/backing-dev.h>
struct backing_dev_info bdi;
], [
char *name = "bdi";
unsigned int cap = BDI_CAP_MAP_COPY;
int error __attribute__((unused)) =
bdi_setup_and_register(&bdi, name, cap);
], [bdi_setup_and_register], [mm/backing-dev.c], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_3ARGS_BDI_SETUP_AND_REGISTER, 1,
[bdi_setup_and_register() wants 3 args])
], [
AC_MSG_RESULT(no)
])
])
])
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