From patchwork Fri Nov 20 10:21:05 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joakim Tjernlund X-Patchwork-Id: 38904 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from bilbo.ozlabs.org (localhost [127.0.0.1]) by ozlabs.org (Postfix) with ESMTP id 6AF84101951 for ; Fri, 20 Nov 2009 21:22:18 +1100 (EST) Received: by ozlabs.org (Postfix) id 544411007D3; Fri, 20 Nov 2009 21:21:28 +1100 (EST) Delivered-To: linuxppc-dev@ozlabs.org Received: from gw1.transmode.se (gw1.transmode.se [213.115.205.20]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id E30EFB6F18 for ; Fri, 20 Nov 2009 21:21:27 +1100 (EST) Received: from sesr04.transmode.se (sesr04.transmode.se [192.168.201.15]) by gw1.transmode.se (Postfix) with ESMTP id 37B01650008; Fri, 20 Nov 2009 11:21:24 +0100 (CET) Received: from gentoo-jocke.transmode.se ([192.168.1.15]) by sesr04.transmode.se (Lotus Domino Release 8.5 HF964) with ESMTP id 2009112011212435-44036 ; Fri, 20 Nov 2009 11:21:24 +0100 Received: from gentoo-jocke.transmode.se (gentoo-jocke.transmode.se [127.0.0.1]) by gentoo-jocke.transmode.se (8.14.0/8.14.0) with ESMTP id nAKALOHV003230; Fri, 20 Nov 2009 11:21:24 +0100 Received: (from jocke@localhost) by gentoo-jocke.transmode.se (8.14.0/8.14.0/Submit) id nAKALONw003229; Fri, 20 Nov 2009 11:21:24 +0100 From: Joakim Tjernlund To: Scott Wood , "linuxppc-dev@ozlabs.org" , Rex Feany Subject: [PATCH 04/10] 8xx: Always pin kernel instruction TLB Date: Fri, 20 Nov 2009 11:21:05 +0100 Message-Id: <1258712471-3104-5-git-send-email-Joakim.Tjernlund@transmode.se> X-Mailer: git-send-email 1.6.4.4 In-Reply-To: <1258712471-3104-4-git-send-email-Joakim.Tjernlund@transmode.se> References: <1258712471-3104-1-git-send-email-Joakim.Tjernlund@transmode.se> <1258712471-3104-2-git-send-email-Joakim.Tjernlund@transmode.se> <1258712471-3104-3-git-send-email-Joakim.Tjernlund@transmode.se> <1258712471-3104-4-git-send-email-Joakim.Tjernlund@transmode.se> X-MIMETrack: Itemize by SMTP Server on sesr04/Transmode(Release 8.5 HF964|October 21, 2009) at 2009-11-20 11:21:24, Serialize by Router on sesr04/Transmode(Release 8.5 HF964|October 21, 2009) at 2009-11-20 11:21:24, Serialize complete at 2009-11-20 11:21:24 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Various kernel asm modifies SRR0/SRR1 just before executing a rfi. If such code crosses a page boundary you risk a TLB miss which will clobber SRR0/SRR1. Avoid this by always pinning kernel instruction TLB space. Signed-off-by: Joakim Tjernlund --- arch/powerpc/kernel/head_8xx.S | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S index a9f1ace..e70503d 100644 --- a/arch/powerpc/kernel/head_8xx.S +++ b/arch/powerpc/kernel/head_8xx.S @@ -705,7 +705,7 @@ start_here: */ initial_mmu: tlbia /* Invalidate all TLB entries */ -#ifdef CONFIG_PIN_TLB +#if 1 /* CONFIG_PIN_TLB */ lis r8, MI_RSV4I@h ori r8, r8, 0x1c00 #else