- GC unused cpu_thread_link().

- Move the enabling of interrupts out of assembly and into C a few
  instructions later at cpu_critical_fork_exit().  This puts more of the
  MD critical section implementation under the MD critical section API
  making it easier to test and develop alternative implementations.

sys/i386/i386/critical.c

@@ -58,24 +58,12 @@ cpu_unpend(void)
 
 /*
  * cpu_critical_fork_exit() - cleanup after fork
- *
- *	For i386 we do not have to do anything, td_critnest is
- *	handled by the fork trampoline code.
  */
 void
 cpu_critical_fork_exit(void)
 {
-}
 
-/*
- * cpu_thread_link() - thread linkup, initialize machine-dependant fields
- *
- *	There are currently no machine-dependant fields that require 
- *	initialization.
- */
-void
-cpu_thread_link(struct thread *td)
-{
+	enable_intr();
 }
 
 /*

sys/i386/i386/exception.s

@@ -217,9 +217,6 @@ ENTRY(fork_trampoline)
 	pushl	%esp			/* trapframe pointer */
 	pushl	%ebx			/* arg1 */
 	pushl	%esi			/* function */
-	movl    PCPU(CURTHREAD),%ebx	/* setup critnest */
-	movl	$1,TD_CRITNEST(%ebx)
-	sti				/* enable interrupts */
 	call	fork_exit
 	addl	$12,%esp
 	/* cut from syscall */

sys/i386/include/critical.h

@@ -8,7 +8,6 @@
  *	cpu_critical_enter()		- inlined
  *	cpu_critical_exit()		- inlined
  *	cpu_critical_fork_exit()	- prototyped
- *	cpu_thread_link()		- prototyped
  *	related support functions residing
  *	in <arch>/<arch>/critical.c	- prototyped
  *
@@ -25,7 +24,6 @@ __BEGIN_DECLS
  */
 void cpu_unpend(void);
 void cpu_critical_fork_exit(void);
-void cpu_thread_link(struct thread *td);
 
 #ifdef	__GNUC__