This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-devel] [PATCH 2/10] linux 2.6.18: COMPAT_VDSO

To: Jan Beulich <jbeulich@xxxxxxxxxx>, Keir Fraser <keir@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH 2/10] linux 2.6.18: COMPAT_VDSO
From: Keir Fraser <keir@xxxxxxxxxxxxx>
Date: Mon, 05 Mar 2007 15:55:15 +0000
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date: Mon, 05 Mar 2007 07:54:36 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <45EC3BE9.76E4.0078.0@xxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: AcdfPqod6G87iMsxEdu3zwAX8io7RQ==
Thread-topic: [Xen-devel] [PATCH 2/10] linux 2.6.18: COMPAT_VDSO
User-agent: Microsoft-Entourage/
On 5/3/07 14:48, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

> It's gonna be really old libc-s that need an absolutely invariable address.
> But
> you certainly recall that in 2.6.16 (and probably earlier) we had a hack to
> map
> it in right below PAGE_OFFSET, which worked too for not really new but also
> not really old libc-s. It is those intermediate libc (supporting AT_SYSINFO
> but
> not AT_SYSINFO_EHDR) versions that the option attempts to address for
> Xen. I happen to have a SuSE 9.0 system still in active use that doesn't work
> without this option, and I think glibc 2.3.2 shouldn't be considered entirely
> obsolete, yet.

The build-system approach looks simplest (certainly smaller than the C code)
but is impenetrable to read. I think we'd take that approach if you add some
comments to explain what's going on in the makefile runes.

 -- Keir

Xen-devel mailing list