From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C1FCCC433FF for ; Tue, 30 Jul 2019 14:42:40 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 92EFF206E0 for ; Tue, 30 Jul 2019 14:42:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="WiE5FFmN" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 92EFF206E0 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender:Content-Type: Content-Transfer-Encoding:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=BwACOFcxdnxMk5ftWXSC9R6WigxgrZ18x9i7RpMcquQ=; b=WiE5FFmNCH1a3LOeiLaZ4Lu2u l5nW9gHwOQs7CRxphrJCAvoWRnDNnSoVLaHtm3lZZQPbwzbCUP57lsLYHryLjLpbEr6qmVSIS5u7l aX8YQaLj+cD+K1RBWYCkl0shWqbIY7Ar3fRIwUej8YkMndOYse3ayKemsNq5yruJfrNnPY+cBr2K1 iHFtztexZalX9LakyOSJh/5xxaoanUSKqN3M6i2FErZba1wfbccrETRawteGdWcEIL9lxmZxNAaRv M+vj3n7N7FzysFScIonrSz0IQ1hrfkazj3ZD0tih7A7EOnPpc25oy9W86xGNPJYCwnY3I665tzhqM wKdeNJ3KA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hsTKq-0002f9-6R; Tue, 30 Jul 2019 14:42:40 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hsTKo-0002eb-AF for linux-arm-kernel@lists.infradead.org; Tue, 30 Jul 2019 14:42:39 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id C1F4328; Tue, 30 Jul 2019 07:42:37 -0700 (PDT) Received: from [192.168.0.21] (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id EC28C3F694; Tue, 30 Jul 2019 07:42:36 -0700 (PDT) Subject: Re: [PATCH] arm64: cpufeature: Fix feature comparison for CTR_EL0.{CWG,ERG} To: will@kernel.org, catalin.marinas@arm.com References: <20190730144020.3518-1-will@kernel.org> From: Suzuki K Poulose Message-ID: Date: Tue, 30 Jul 2019 15:45:41 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <20190730144020.3518-1-will@kernel.org> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190730_074238_392774_7E6AD97B X-CRM114-Status: GOOD ( 12.71 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-kernel@lists.infradead.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 07/30/2019 03:40 PM, Will Deacon wrote: > If CTR_EL0.{CWG,ERG} are 0b0000 then they must be interpreted to have > their architecturally maximum values, which defeats the use of > FTR_HIGHER_SAFE when sanitising CPU ID registers on heterogeneous > machines. > > Introduce FTR_HIGHER_OR_ZERO_SAFE so that these fields effectively > saturate at zero. > > Cc: Suzuki Poulose > Fixes: 3c739b571084 ("arm64: Keep track of CPU feature registers") > Signed-off-by: Will Deacon Reviewed-by: Suzuki K Poulose _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel