config/kernel-bdi-setup-and-register.m4

   1 dnl #
   2 dnl # 2.6.34 API change
   3 dnl # The bdi_setup_and_register() helper function is avilable and
   4 dnl # exported by the kernel.  This is a trivial helper function but
   5 dnl # using it significantly simplifies the code surrounding setting
   6 dnl # up and tearing down the bdi structure.
   7 dnl #
   8 AC_DEFUN([ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER],
   9         [AC_MSG_CHECKING([whether bdi_setup_and_register() is available])
  10         ZFS_LINUX_TRY_COMPILE_SYMBOL([
  11                 #include <linux/backing-dev.h>
  12         ], [
  13                 bdi_setup_and_register(NULL, NULL, 0);
  14         ], [bdi_setup_and_register], [mm/backing-dev.c], [
  15                 AC_MSG_RESULT(yes)
  16                 AC_DEFINE(HAVE_BDI_SETUP_AND_REGISTER, 1,
  17                           [bdi_setup_and_register() is available])
  18         ], [
  19                 AC_MSG_RESULT(no)
  20         ])
  21 ])