. new kernel call sysctl for generic unprivileged system operations;

now used for printing diagnostic messages through the kernel message
   buffer. this lets processes print diagnostics without sending messages
   to tty and log directly, simplifying the message protocol a lot and
   reducing difficulties with deadlocks and other situations in which
   diagnostics are blackholed (e.g. grants don't work). this makes
   DIAGNOSTICS(_S), ASYN_DIAGNOSTICS and DIAG_REPL obsolete, although tty
   and log still accept the codes for 'old' binaries. This also simplifies
   diagnostics in several servers and drivers - only tty needs its own
   kputc() now.
 . simplifications in vfs, and some effort to get the vnode references
   right (consistent) even during shutdown. m_mounted_on is now NULL
   for root filesystems (!) (the original and new root), a less awkward
   special case than 'm_mounted_on == m_root_node'. root now has exactly
   one reference, to root, if no files are open, just like all other
   filesystems. m_driver_e is unused.

servers/pm/misc.c

@@ -69,7 +69,7 @@ PUBLIC int do_allocmem()
 {
 	int r;
 	phys_bytes retmembase;
-	r = vm_allocmem(m_in.memsize, &retmembase);
+	r = vm_allocmem(m_in.memsize, (phys_clicks *) &retmembase);
 	if(r == OK)
 		mp->mp_reply.membase = retmembase;
 	return r;