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From: Jeff Roberson <jeff@FreeBSD.org>
Date: Tue, 21 Nov 2017 21:16:48 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-user@freebsd.org
Subject: svn commit: r326076 - user/jeff/numa/sys/vm
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Author: jeff
Date: Tue Nov 21 21:16:48 2017
New Revision: 326076
URL: https://svnweb.freebsd.org/changeset/base/326076

Log:
  Update for r325992
  
  Just return if the caller specifies a zero size.  This can happen when
  kmem_back fails to allocate the first page.

Modified:
  user/jeff/numa/sys/vm/vm_kern.c

Modified: user/jeff/numa/sys/vm/vm_kern.c
==============================================================================
--- user/jeff/numa/sys/vm/vm_kern.c	Tue Nov 21 20:46:21 2017	(r326075)
+++ user/jeff/numa/sys/vm/vm_kern.c	Tue Nov 21 21:16:48 2017	(r326076)
@@ -528,6 +528,8 @@ _kmem_unback(vm_object_t object, vm_offset_t addr, vm_
 	KASSERT(object == kernel_object,
 	    ("kmem_unback: only supports kernel object."));
 
+	if (size == 0)
+		return 0;
 	pmap_remove(kernel_pmap, addr, addr + size);
 	offset = addr - VM_MIN_KERNEL_ADDRESS;
 	end = offset + size;