[src/trunk]: src/sys/kern Make lwp_ctl_alloc() return 0 instead of EINVAL, wh...

[njoly <njoly%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/e36c9e5c7a38
branches:  trunk
changeset: 753760:e36c9e5c7a38
user:      njoly <njoly%NetBSD.org@localhost>
date:      Fri Apr 09 11:47:17 2010 +0000

description:
Make lwp_ctl_alloc() return 0 instead of EINVAL, when lwpctl user
address already exists. This allow calling _lwp_ctl(2) more than once
on the same LWP.

diffstat:

 sys/kern/kern_lwp.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r e1165022aadc -r e36c9e5c7a38 sys/kern/kern_lwp.c
--- a/sys/kern/kern_lwp.c       Fri Apr 09 11:38:10 2010 +0000
+++ b/sys/kern/kern_lwp.c       Fri Apr 09 11:47:17 2010 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kern_lwp.c,v 1.142 2010/04/06 13:50:22 christos Exp $  */
+/*     $NetBSD: kern_lwp.c,v 1.143 2010/04/09 11:47:17 njoly Exp $     */
 
 /*-
  * Copyright (c) 2001, 2006, 2007, 2008, 2009 The NetBSD Foundation, Inc.
@@ -209,7 +209,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_lwp.c,v 1.142 2010/04/06 13:50:22 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_lwp.c,v 1.143 2010/04/09 11:47:17 njoly Exp $");
 
 #include "opt_ddb.h"
 #include "opt_lockdebug.h"
@@ -1617,7 +1617,7 @@
        if (l->l_lcpage != NULL) {
                lcp = l->l_lcpage;
                *uaddr = lcp->lcp_uaddr + (vaddr_t)l->l_lwpctl - lcp->lcp_kaddr;
-               return (EINVAL);
+               return 0;
        }
 
        /* First time around, allocate header structure for the process. */