zfs-builds-mm/zfs-0.8.1/config/kernel-truncate-setsize.m4

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dnl #
dnl # 2.6.35 API change
dnl # Added truncate_setsize() helper function.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_TRUNCATE_SETSIZE],
[AC_MSG_CHECKING([whether truncate_setsize() is available])
ZFS_LINUX_TRY_COMPILE_SYMBOL([
#include <linux/mm.h>
], [
truncate_setsize(NULL, 0);
], [truncate_setsize], [mm/truncate.c], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_TRUNCATE_SETSIZE, 1,
[truncate_setsize() is available])
], [
AC_MSG_RESULT(no)
])
])