From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751249Ab0CIRTM (ORCPT ); Tue, 9 Mar 2010 12:19:12 -0500 Received: from mail-fx0-f213.google.com ([209.85.220.213]:43931 "EHLO mail-fx0-f213.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750999Ab0CIRTK (ORCPT ); Tue, 9 Mar 2010 12:19:10 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer:mime-version :content-type:content-transfer-encoding; b=NPrO1epbVuuoF6XIpLKq/2lAWvUAcCODQuO159lSYBZX5GnrMrjC9Sw/0FayTrqwrf rrMkprdzqwe4MwtMggdjeW+lg6iftBLUldzHl1zUN0W0X00wzcaZwrydcEeG2OT4KuNd lJCWiA+1f4vm0akvK/cKZsyngq+5t330QcAHI= From: Wu Zhangjin To: Ralf Baechle , Greg KH Cc: linux-mips@linux-mips.org, linux-kernel@vger.kernel.org, Wu Zhangjin Subject: [PATCH 0/3] Workaround the Out-of-order Issue of Loongson-2F Date: Wed, 10 Mar 2010 01:12:30 +0800 Message-Id: X-Mailer: git-send-email 1.7.0.1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Wu Zhangjin As the Chapter 15: "Errata: Issue of Out-of-order in loongson"[1] shows, to workaround the Issue of Loongson-2F，We need to do: o When switching from user model to kernel model, you should flush the branch target history such as BTB and RAS. o Doing some tricks to the indirect branch target to make sure that the indirect branch target can not be in the I/O region. This patchset applied the above methods and for the binutils patch[3] have been merged into binutils 2.20.1, so, it's time to upstream this patchset now. without this patch, the machines will hang when the instruction sequence hit the Out-of-order Issue of Loongson-2F, therefore, this patchset is very urgent for both 2.6.33 and 2.6.34. [1] Chinese Version: http://www.loongson.cn/uploadfile/file/20080821113149.pdf [2] English Version of Chapter 15: http://groups.google.com.hk/group/loongson-dev/msg/e0d2e220958f10a6?dmode=source [3] http://sourceware.org/ml/binutils/2009-11/msg00387.html Regards, Wu Zhangjin Wu Zhangjin (3): Loongson-2F: Flush the branch target history such as BTB and RAS Loongson-2F: Enable fixups of binutils 2.20.1 Loongson-2F: Fixup of problems introduced by -mfix-loongson2f-jump of binutils 2.20.1 arch/mips/Makefile | 4 +++- arch/mips/include/asm/stackframe.h | 19 +++++++++++++++++++ arch/mips/loongson/common/reset.c | 12 +++++++++++- 3 files changed, 33 insertions(+), 2 deletions(-)