From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jan Beulich" <JBeulich@suse.com>
Subject: Re: [PATCH] x86: Convert shadow-paging to Kconfig
Date: Tue, 19 Jan 2016 06:27:44 -0700
Message-ID: <569E47E002000078000C88B0@prv-mh.provo.novell.com>
References: <1453142404-8819-1-git-send-email-andrew.cooper3@citrix.com>
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To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: George Dunlap <George.Dunlap@eu.citrix.com>, Tim Deegan <tim@xen.org>, Doug Goldstein <cardoe@cardoe.com>, Xen-devel <xen-devel@lists.xen.org>
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>>> On 18.01.16 at 19:40, <andrew.cooper3@citrix.com> wrote:
> --- a/xen/arch/x86/mm/shadow/Makefile
> +++ b/xen/arch/x86/mm/shadow/Makefile
> @@ -1,4 +1,4 @@
> -ifeq ($(shadow-paging),y)
> +ifdef CONFIG_SHADOW_PAGING
>  obj-y += common.o guest_2.o guest_3.o guest_4.o
>  else
>  obj-y += none.o

Why didn't you retain the ifeq? The way it's now, accidental
definition of the macro elsewhere would alter behavior. In fact
I think the better thing here would be to change this to purely
list model:

obj-y := none.o
obj-$(CONFIG_SHADOW_PAGING) := common.o guest_2.o guest_3.o guest_4.o

Not sure why I didn't do that right when making this configurable...

Jan