From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <Ian.Campbell@XenSource.com>
Subject: Re: [Q]Xen 3.1 kernel config surprises!!
Date: Fri, 17 Aug 2007 13:31:16 +0100
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To: pradeep singh rautela <rautelap@gmail.com>
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On Fri, 2007-08-17 at 14:54 +0530, pradeep singh rautela wrote:

> Sorry but i thought kernel config is supposed to be saved on exit from
> menuconfig and not vanished. Did i miss something silly?

No, this seems to have been broken when the kernel was upgraded to
2.6.18 (i.e. frickin' ages ago!). It seems that "make oldconfig" doesn't
create include/linux/autoconf.h anymore and that "make silentoldconfig"
is required instead. We use include/linux/autoconfig.h as the makefile
stamp to indicate whether to write an initial configuration or not.

Can you try 
http://xenbits.xensource.com/staging/xen-unstable.hg?rev/ae923d1f50bf

Ian.