[mirror_zfs-debian.git] / config / kernel-bio-end-io-t-args.m4

dnl #
dnl # 2.6.24 API change
dnl # Size argument dropped from bio_endio and bi_end_io, because the
dnl # bi_end_io is only called once now when the request is complete.
dnl # There is no longer any need for a size argument.  This also means
dnl # that partial IO's are no longer possibe and the end_io callback
dnl # should not check bi->bi_size.  Finally, the return type was updated
dnl # to void.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_BIO_END_IO_T_ARGS], [
	AC_MSG_CHECKING([whether bio_end_io_t wants 2 args])
	tmp_flags="$EXTRA_KCFLAGS"
	EXTRA_KCFLAGS="-Werror"
	ZFS_LINUX_TRY_COMPILE([
		#include <linux/bio.h>
	],[
		void (*wanted_end_io)(struct bio *, int) = NULL;
		bio_end_io_t *local_end_io __attribute__ ((unused));

		local_end_io = wanted_end_io;
	],[
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_2ARGS_BIO_END_IO_T, 1,
		          [bio_end_io_t wants 2 args])
	],[
		AC_MSG_RESULT(no)
	])
	EXTRA_KCFLAGS="$tmp_flags"
])
Commit	Line	Data
c9c0d073 BB	1	dnl #
	2	dnl # 2.6.24 API change
	3	dnl # Size argument dropped from bio_endio and bi_end_io, because the
	4	dnl # bi_end_io is only called once now when the request is complete.
	5	dnl # There is no longer any need for a size argument. This also means
	6	dnl # that partial IO's are no longer possibe and the end_io callback
	7	dnl # should not check bi->bi_size. Finally, the return type was updated
	8	dnl # to void.
	9	dnl #
	10	AC_DEFUN([ZFS_AC_KERNEL_BIO_END_IO_T_ARGS], [
	11	AC_MSG_CHECKING([whether bio_end_io_t wants 2 args])
	12	tmp_flags="$EXTRA_KCFLAGS"
	13	EXTRA_KCFLAGS="-Werror"
	14	ZFS_LINUX_TRY_COMPILE([
	15	#include <linux/bio.h>
	16	],[
	17	void (wanted_end_io)(struct bio , int) = NULL;
79713039	18	bio_end_io_t *local_end_io __attribute__ ((unused));
c9c0d073 BB	19
	20	local_end_io = wanted_end_io;
	21	],[
	22	AC_MSG_RESULT(yes)
	23	AC_DEFINE(HAVE_2ARGS_BIO_END_IO_T, 1,
	24	[bio_end_io_t wants 2 args])
	25	],[
	26	AC_MSG_RESULT(no)
	27	])
	28	EXTRA_KCFLAGS="$tmp_flags"
	29	])