From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753301Ab2LMGr5 (ORCPT ); Thu, 13 Dec 2012 01:47:57 -0500 Received: from terminus.zytor.com ([198.137.202.10]:59176 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751626Ab2LMGry (ORCPT ); Thu, 13 Dec 2012 01:47:54 -0500 User-Agent: K-9 Mail for Android In-Reply-To: <1355379433.24701.1.camel@wall-e> 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> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: Re: [PATCH] Add VDSO time function support for x86 32-bit kernel From: "H. Peter Anvin" Date: Wed, 12 Dec 2012 22:47:31 -0800 To: Stefani Seibold 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 Message-ID: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Should be a simple matter of sharing pages. Look perhaps at the x32 vdso for a hint. Stefani Seibold wrote: >Am Mittwoch, den 12.12.2012, 22:14 -0800 schrieb H. Peter Anvin: >> This is too late for 3.8 anyway, so there is time to make it work >correctly before tge 3.9 merge window anyway. After this merge window >is over I may pull tjis into a testing branch, but compat support is a >precondition. >> >> The vdso is only optional if you build in backwards compatibility >anyway, and software has a right to expect a specific numeric kernel >version to export a single ABI. >> > >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. > >- Stefani -- Sent from my mobile phone. Please excuse brevity and lack of formatting.