From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753124Ab2LMHSS (ORCPT ); Thu, 13 Dec 2012 02:18:18 -0500 Received: from www84.your-server.de ([213.133.104.84]:58850 "EHLO www84.your-server.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751253Ab2LMHSR (ORCPT ); Thu, 13 Dec 2012 02:18:17 -0500 Message-ID: <1355383038.18653.2.camel@wall-e> Subject: Re: [PATCH] Add VDSO time function support for x86 32-bit kernel From: Stefani Seibold To: "H. Peter Anvin" Cc: linux-kernel@vger.kernel.org, x86@kernel.org, tglx@linutronix.de, mingo@redhat.com, ak@linux.intel.com, aarcange@redhat.com, john.stultz@linaro.org, luto@amacapital.net Date: Thu, 13 Dec 2012 08:17:18 +0100 In-Reply-To: References: <1355343572-23074-1-git-send-email-stefani@seibold.net> <50C9148C.4040308@zytor.com> <1355378005.24283.11.camel@wall-e> <1d3061cb-76d0-4e42-9b75-a975b05384ec@email.android.com> <1355379433.24701.1.camel@wall-e> Content-Type: text/plain; charset="ISO-8859-15" X-Mailer: Evolution 3.4.4 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-Authenticated-Sender: stefani@seibold.net Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Am Mittwoch, den 12.12.2012, 22:47 -0800 schrieb H. Peter Anvin: > Should be a simple matter of sharing pages. Look perhaps at the x32 vdso for a hint. > > > > >Any idea or clean solution how i can map the 64 bit vgtod into the 32 > >bit address space? Thats the only problem i see. > > No, i see no special handling for x32 vdso to do this. I am not sure if x32 vdso can access the 64 bit address space of vsyscall_gtod_data. I can't test this due the lack of a x32 abi system.