From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755434Ab3DVOgl (ORCPT ); Mon, 22 Apr 2013 10:36:41 -0400 Received: from caramon.arm.linux.org.uk ([78.32.30.218]:36372 "EHLO caramon.arm.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754854Ab3DVOgi (ORCPT ); Mon, 22 Apr 2013 10:36:38 -0400 Date: Mon, 22 Apr 2013 15:36:16 +0100 From: Russell King - ARM Linux To: =?iso-8859-1?Q?Andr=E9?= Hentschel Cc: linux-arch@vger.kernel.org, will.deacon@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org Subject: Re: [PATCHv2] arm: Preserve TPIDRURW on context switch Message-ID: <20130422143616.GP14496@n2100.arm.linux.org.uk> References: <517168BB.3070903@dawncrow.de> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <517168BB.3070903@dawncrow.de> User-Agent: Mutt/1.5.19 (2009-01-05) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Apr 19, 2013 at 05:54:35PM +0200, André Hentschel wrote: > From: =?UTF-8?q?Andr=C3=A9=20Hentschel?= > > There are more and more applications coming to WinRT, Wine could support them, > but mostly they expect to have the thread environment block (TEB) in TPIDRURW. > This register must be preserved per thread instead of being cleared. > > Signed-off-by: André Hentschel This actually makes things less efficient all round, because you now use the value immediately after loading, which means it will cause pipeline stalls, certainly on older CPUs. Could you please rework the patch to try avoiding soo many modifications to the way things have been done here?