--- /dev/null
+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)
+ ])
+ ])
+])