AC_CHECK_LINUX_FUNC([inode_nohighmem],
[#include <linux/fs.h>],
[inode_nohighmem(NULL);])
+ AC_CHECK_LINUX_FUNC([inode_lock],
+ [#include <linux/fs.h>],
+ [inode_lock(NULL);])
dnl Consequences - things which get set as a result of the
dnl above tests