+dnl #
+dnl # 3.5.0 API change
+dnl # torvalds/linux@dbd5768f87ff6fb0a4fe09c4d7b6c4a24de99430 and
+dnl # torvalds/linux@7994e6f7254354e03028a11f98a27bd67dace9f1 reworked
+dnl # where inode_sync_wait() is called.
+dnl #
+dnl # Prior to these changes it would occur in end_writeback() but due
+dnl # to various issues (described in the above commits) it has been
+dnl # moved to evict(). This changes the ordering is which sync occurs
+dnl # but otherwise doesn't impact the zpl implementation.
+dnl #
+dnl # The major impact here is the renaming of end_writeback() to
+dnl # clear_inode(). However, care must be taken when detecting this
+dnl # API change because as recently as 2.6.35 there was a clear_inode()
+dnl # function. However, it was made obsolete by the evict_inode() API
+dnl # change at the same time.
+dnl #
+dnl # Therefore, to ensure we have the correct API we only allow the
+dnl # clear_inode() compatibility code to be defined iff the evict_inode()
+dnl # functionality is also detected.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_CLEAR_INODE], [
+ ZFS_CHECK_SYMBOL_EXPORT(
+ [clear_inode],
+ [fs/inode.c],
+ [AC_DEFINE(HAVE_CLEAR_INODE, 1,
+ [clear_inode() is available])],
+ [])
+])