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[Xen-changelog] Support __XEN_INTERFACE_VERSION__ defined to the empty s

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Subject:	[Xen-changelog] Support __XEN_INTERFACE_VERSION__ defined to the empty string.
From:	Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>
Date:	Fri, 07 Apr 2006 00:50:06 +0000
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# HG changeset patch
# User cl349@xxxxxxxxxxxxxxxxxxxx
# Node ID 0010df11836d182fbb00ebcc016e9e51705470e0
# Parent  b6c5920e5d998d8055a8b2f540462ace3e860d99
Support __XEN_INTERFACE_VERSION__ defined to the empty string.
This can happen when building Linux with an old .config file which
doesn't have a value for CONFIG_XEN_INTERFACE_VERSION.

Signed-off-by: Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>

diff -r b6c5920e5d99 -r 0010df11836d xen/include/public/xen-compat.h
--- a/xen/include/public/xen-compat.h   Thu Apr  6 17:58:39 2006
+++ b/xen/include/public/xen-compat.h   Thu Apr  6 23:32:54 2006
@@ -14,8 +14,11 @@
 #if defined(__XEN__)
 /* Xen is built with matching headers and implements the latest interface. */
 #define __XEN_INTERFACE_VERSION__ __XEN_LATEST_INTERFACE_VERSION__
-#elif !defined(__XEN_INTERFACE_VERSION__)
+#elif (__XEN_INTERFACE_VERSION__ - 0) == 0
 /* Guests which do not specify a version get the legacy interface. */
+#ifdef __XEN_INTERFACE_VERSION__
+#undef __XEN_INTERFACE_VERSION__
+#endif
 #define __XEN_INTERFACE_VERSION__ 0x00000000
 #endif
 

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