[src/trunk]: src/sys/rump/librump/rumpvfs If zeroing len == 0, return immedia...

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

details:   https://anonhg.NetBSD.org/src/rev/af4772799ec8
branches:  trunk
changeset: 750097:af4772799ec8
user:      pooka <pooka%NetBSD.org@localhost>
date:      Wed Dec 16 16:50:49 2009 +0000

description:
If zeroing len == 0, return immediately.
(kmem_alloc() doesn't like being called with size == 0)

diffstat:

 sys/rump/librump/rumpvfs/vm_vfs.c |  7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diffs (28 lines):

diff -r 625cfd931116 -r af4772799ec8 sys/rump/librump/rumpvfs/vm_vfs.c
--- a/sys/rump/librump/rumpvfs/vm_vfs.c Wed Dec 16 16:03:26 2009 +0000
+++ b/sys/rump/librump/rumpvfs/vm_vfs.c Wed Dec 16 16:50:49 2009 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: vm_vfs.c,v 1.14 2009/11/10 16:55:12 pooka Exp $        */
+/*     $NetBSD: vm_vfs.c,v 1.15 2009/12/16 16:50:49 pooka Exp $        */
 
 /*
  * Copyright (c) 2008 Antti Kantee.  All Rights Reserved.
@@ -29,7 +29,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: vm_vfs.c,v 1.14 2009/11/10 16:55:12 pooka Exp $");
+__KERNEL_RCSID(0, "$NetBSD: vm_vfs.c,v 1.15 2009/12/16 16:50:49 pooka Exp $");
 
 #include <sys/param.h>
 
@@ -91,6 +91,9 @@
        int maxpages = MIN(32, round_page(len) >> PAGE_SHIFT);
        int rv, npages, i;
 
+       if (maxpages == 0)
+               return;
+
        pgs = kmem_zalloc(maxpages * sizeof(pgs), KM_SLEEP);
        while (len) {
                npages = MIN(maxpages, round_page(len) >> PAGE_SHIFT);