[ALPHA] Update clone syscall for child_tid argument.

arch/alpha/kernel/entry.S

@@ -688,12 +688,13 @@ __kernel_execve:
 	.ent	sys_fork
 sys_fork:
 	.prologue 0
-	mov	$sp, $19
+	mov	$sp, $21
 	bsr	$1, do_switch_stack
-	/* A fork is the same as clone(SIGCHLD, 0);  */
 	bis	$31, SIGCHLD, $16
 	mov	$31, $17
 	mov	$31, $18
+	mov	$31, $19
+	mov	$31, $20
 	jsr	$26, alpha_clone
 	bsr	$1, undo_switch_stack
 	ret
@@ -704,10 +705,9 @@ sys_fork:
 	.ent	sys_clone
 sys_clone:
 	.prologue 0
-	mov	$sp, $19
+	mov	$sp, $21
 	bsr	$1, do_switch_stack
-	/* $16, $17, $18, $19 come from the user; $19 is used later
-	   via pt_regs->r19.  */
+	/* $16, $17, $18, $19, $20 come from the user.  */
 	jsr	$26, alpha_clone
 	bsr	$1, undo_switch_stack
 	ret
@@ -718,8 +718,8 @@ sys_clone:
 	.ent	sys_vfork
 sys_vfork:
 	.prologue 0
-	bsr	$1, do_switch_stack
 	mov	$sp, $16
+	bsr	$1, do_switch_stack
 	jsr	$26, alpha_vfork
 	bsr	$1, undo_switch_stack
 	ret

arch/alpha/kernel/process.c

@@ -235,24 +235,25 @@ release_thread(struct task_struct *dead_task)
  * with parameters (SIGCHLD, 0).
  */
 int
-alpha_clone(unsigned long clone_flags, unsigned long usp, int *user_tid,
-	    struct pt_regs *regs)
+alpha_clone(unsigned long clone_flags, unsigned long usp, int *parent_tid,
+	    int *child_tid, unsigned long tls_value, struct pt_regs *regs)
 {
 	struct task_struct *p;
 
 	if (!usp)
 		usp = rdusp();
 
-	p = do_fork(clone_flags & ~CLONE_IDLETASK, usp, regs, 0, user_tid);
+	p = do_fork(clone_flags & ~CLONE_IDLETASK, usp, regs, 0,
+		    parent_tid, child_tid);
 	return IS_ERR(p) ? PTR_ERR(p) : p->pid;
 }
 
 int
-alpha_vfork(struct switch_stack * swstack)
+alpha_vfork(struct pt_regs *regs)
 {
 	struct task_struct *p;
 	p = do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(),
-		    (struct pt_regs *) (swstack+1), 0, NULL);
+		    regs, 0, NULL, NULL);
 	return IS_ERR(p) ? PTR_ERR(p) : p->pid;
 }
 
@@ -306,7 +307,7 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
 	   required for proper operation in the case of a threaded
 	   application calling fork.  */
 	if (clone_flags & CLONE_SETTLS)
-		childti->pcb.unique = regs->r19;
+		childti->pcb.unique = regs->r20;
 
 	return 0;
 }