NFS with 2.5.75 as both client and server is broken with GNU Make.

The nanosecond field of timestamps of newly touched files is often
negative on the client, which is probably why Make fails.  The value
also bears no relation to the file's nanosecond field on the server.

The culprit is htons() used where htonl() should be:

-	*p++ = htonl((u32) time->tv_sec); *p++ = htons(time->tv_nsec);
+	*p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);

The rest of this patch corrects nfsd to use microseconds in NFSv2, not
nanoseconds.  (The client already gets this right, but I have
optimised it slightly to avoid division when possible).

The change to detach the threads in zap_other_threads() broke the case
where the non-thread-group-leader is the cause of de_thread().

In this case the group leader will be detached and freed before
switch_exec_pids() is complete and invalid data will be used.  This is a
patch that makes sure that the group leader does not get detached and
reaped.

into home.osdl.org:/home/torvalds/v2.5/linux

into home.osdl.org:/home/torvalds/v2.5/linux

into home.osdl.org:/home/torvalds/v2.5/linux

This is a cleaner fix that avoids having two separate unlock
operations.

This disables the local APIC before reboot.  This fixes BIOS reboot
problems reported by a few people.

disable_local_APIC() now checks if detect_init_APIC() enabled the
local APIC via the APIC_BASE MSR, and if so it now disables APIC_BASE.
Previously we would leave APIC_BASE enabled, and that made some
BIOSen unhappy.

The SMP reboot code calls disable_local_APIC(). On SMP HW there is
no change since detect_init_APIC() isn't called and APIC_BASE isn't
enabled by us. An SMP kernel on UP HW behaves just like an UP_APIC
kernel, so it disables APIC_BASE if we enabled it at boot.

The UP_APIC disable-before-suspend code is simplified since the existing
code to disable APIC_BASE is moved into disable_local_APIC().

(Felix Kühling originally reported the BIOS reboot problem. This is a
fixed-up version of his preliminary patch.)

Again, more work to do here..

Remove prototype. It was wrong anyway.

More to do, but its a beginning.

if ki_users = 1, we don't do the wakeup, which seems wrong.

These copies already did a verify_area above.

- Remove unneeded breaks
- Fix double spin_unlock_irqrestore problem