[mirror_zfs-debian.git] / config / kernel-bdi-setup-and-register.m4

dnl #
dnl # 2.6.34 API change
dnl # The bdi_setup_and_register() helper function is available and
dnl # exported by the kernel.  This is a trivial helper function but
dnl # using it significantly simplifies the code surrounding setting
dnl # up and tearing down the bdi structure.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER],
	[AC_MSG_CHECKING([whether bdi_setup_and_register() is available])
	tmp_flags="$EXTRA_KCFLAGS"
	EXTRA_KCFLAGS="-Wno-unused-result"
	ZFS_LINUX_TRY_COMPILE_SYMBOL([
		#include <linux/backing-dev.h>
	], [
		bdi_setup_and_register(NULL, NULL, 0);
	], [bdi_setup_and_register], [mm/backing-dev.c], [
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_BDI_SETUP_AND_REGISTER, 1,
		          [bdi_setup_and_register() is available])
	], [
		AC_MSG_RESULT(no)
	])
	EXTRA_KCFLAGS="$tmp_flags"
])
Commit	Line	Data
5547c2f1 BB	1	dnl #
5547c2f1 BB	2	dnl # 2.6.34 API change
a08ee875	3	dnl # The bdi_setup_and_register() helper function is available and
5547c2f1 BB	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 #
70574182 ED	8	AC_DEFUN([ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER],
70574182 ED	9	[AC_MSG_CHECKING([whether bdi_setup_and_register() is available])
a08ee875 LG	10	tmp_flags="$EXTRA_KCFLAGS"
a08ee875 LG	11	EXTRA_KCFLAGS="-Wno-unused-result"
70574182 ED	12	ZFS_LINUX_TRY_COMPILE_SYMBOL([
	13	#include <linux/backing-dev.h>
	14	], [
	15	bdi_setup_and_register(NULL, NULL, 0);
	16	], [bdi_setup_and_register], [mm/backing-dev.c], [
	17	AC_MSG_RESULT(yes)
	18	AC_DEFINE(HAVE_BDI_SETUP_AND_REGISTER, 1,
	19	[bdi_setup_and_register() is available])
	20	], [
	21	AC_MSG_RESULT(no)
	22	])
a08ee875	23	EXTRA_KCFLAGS="$tmp_flags"
5547c2f1	24	])