AC_CHECK_LINUX_FUNC([zero_user_segments],
[#include <linux/highmem.h>],
[zero_user_segments(NULL, 0, 0, 0, 0);])
+ AC_CHECK_LINUX_FUNC([noop_fsync],
+ [#include <linux/fs.h>],
+ [noop_fsync(NULL, 0, 0, 0);])
dnl Consequences - things which get set as a result of the
dnl above tests