From patchwork Thu Jul 23 00:48:02 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sebastian Reichel X-Patchwork-Id: 6848751 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 937E19F38C for ; Thu, 23 Jul 2015 00:51:32 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id B6FC8206E8 for ; Thu, 23 Jul 2015 00:51:31 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D9E4D206D5 for ; Thu, 23 Jul 2015 00:51:30 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZI4h6-0000yS-Mi; Thu, 23 Jul 2015 00:49:04 +0000 Received: from ring0.de ([5.45.105.125]) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZI4go-0000uj-0D for linux-arm-kernel@lists.infradead.org; Thu, 23 Jul 2015 00:48:46 +0000 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-5.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 From: Sebastian Reichel To: Tony Lindgren , Russell King Subject: [PATCH 2/3] ARM: update errata 430973 documentation Date: Thu, 23 Jul 2015 02:48:02 +0200 Message-Id: <1437612483-30160-3-git-send-email-sre@kernel.org> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1437612483-30160-1-git-send-email-sre@kernel.org> References: <1437612483-30160-1-git-send-email-sre@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150722_174846_217920_BAC77980 X-CRM114-Status: UNSURE ( 8.14 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -3.1 (---) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Sebastian Reichel MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP The Errata 430973 workaround config option only enables the IBE bit, which should be done by the bootloader if possible. Signed-off-by: Sebastian Reichel --- arch/arm/Kconfig | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 1c50210..0e4929b 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1078,6 +1078,10 @@ config ARM_ERRATA_430973 and also flushes the branch target cache at every context switch. Note that setting specific bits in the ACTLR register may not be available in non-secure mode. + Instead of enabling this option, it is recommended to enable the + workaround by setting the IBE bit from the bootloader, since the + BTB/BTAC operations are always executed for context switches on + Cortex-A8. config ARM_ERRATA_458693 bool "ARM errata: Processor deadlock when a false hazard is created"