[src/trunk]: src/sys/rump/librump/rumpkern Shortcircuit remote 0-len copyin/o...

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

details:   https://anonhg.NetBSD.org/src/rev/5eced77850b2
branches:  trunk
changeset: 760618:5eced77850b2
user:      pooka <pooka%NetBSD.org@localhost>
date:      Sun Jan 09 14:12:37 2011 +0000

description:
Shortcircuit remote 0-len copyin/out already in the kernel.

diffstat:

 sys/rump/librump/rumpkern/rumpcopy.c |  8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diffs (36 lines):

diff -r 670fea919175 -r 5eced77850b2 sys/rump/librump/rumpkern/rumpcopy.c
--- a/sys/rump/librump/rumpkern/rumpcopy.c      Sun Jan 09 14:10:03 2011 +0000
+++ b/sys/rump/librump/rumpkern/rumpcopy.c      Sun Jan 09 14:12:37 2011 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: rumpcopy.c,v 1.14 2011/01/09 13:49:57 pooka Exp $      */
+/*     $NetBSD: rumpcopy.c,v 1.15 2011/01/09 14:12:37 pooka Exp $      */
 
 /*
  * Copyright (c) 2009 Antti Kantee.  All Rights Reserved.
@@ -26,7 +26,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: rumpcopy.c,v 1.14 2011/01/09 13:49:57 pooka Exp $");
+__KERNEL_RCSID(0, "$NetBSD: rumpcopy.c,v 1.15 2011/01/09 14:12:37 pooka Exp $");
 
 #include <sys/param.h>
 #include <sys/lwp.h>
@@ -48,7 +48,7 @@
 
        if (curproc->p_vmspace == vmspace_kernel()) {
                memcpy(kaddr, uaddr, len);
-       } else {
+       } else if (len) {
                error = rumpuser_sp_copyin(curproc->p_vmspace->vm_map.pmap,
                    uaddr, kaddr, len);
        }
@@ -67,7 +67,7 @@
 
        if (curproc->p_vmspace == vmspace_kernel()) {
                memcpy(uaddr, kaddr, len);
-       } else {
+       } else if (len) {
                error = rumpuser_sp_copyout(curproc->p_vmspace->vm_map.pmap,
                    kaddr, uaddr, len);
        }