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=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 BDA64C54FC9 for ; Tue, 21 Apr 2020 16:54:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 99CF52070B for ; Tue, 21 Apr 2020 16:54:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="mG8cHLnU" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728371AbgDUQyG (ORCPT ); Tue, 21 Apr 2020 12:54:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42788 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1726067AbgDUQyG (ORCPT ); Tue, 21 Apr 2020 12:54:06 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 70814C061A41; Tue, 21 Apr 2020 09:54:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=rp8VDyZBUeeKs2u9p/9GeFYyeFLSaQEg10VWwSynIMA=; b=mG8cHLnUUAcy4CshclETXtW125 RxNldbED+BfXhPbFeAEMEt98KoxQAtlIokJFCpiv6uaANt2ywx80Oj3sBWYDSN4THQZ+lCQ4+uMyU 4X3YMQ6ZA4kC9mxsgZsE3Nw2TnnCX4m6C3xJJM1ElcyZH7tjlzK3XI2BeoQANZ9gcJWbcyvz7rklO LTBMXDkr/vRNO556FrJ4gPue5gncbJ0zE3DMO5Lc0RlqxTYlsBTUUbb5jtyMnLmMJSLOIiFv47KFc G8DnFULu5uXdhhaDrinFBybtjd0TrFJDnlmKJN0NvXeAfxG8tqw7iPGxG3oo7cEV2aDEWDlKpsz/W /dAo455g==; Received: from hch by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1jQw9a-00036p-7v; Tue, 21 Apr 2020 16:53:46 +0000 Date: Tue, 21 Apr 2020 09:53:46 -0700 From: Christoph Hellwig To: Zhenyu Ye Cc: peterz@infradead.org, mark.rutland@arm.com, will@kernel.org, catalin.marinas@arm.com, aneesh.kumar@linux.ibm.com, akpm@linux-foundation.org, npiggin@gmail.com, arnd@arndb.de, rostedt@goodmis.org, maz@kernel.org, suzuki.poulose@arm.com, tglx@linutronix.de, yuzhao@google.com, Dave.Martin@arm.com, steven.price@arm.com, broonie@kernel.org, guohanjun@huawei.com, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, xiexiangyou@huawei.com, zhangshaokun@hisilicon.com, linux-mm@kvack.org, arm@kernel.org, prime.zeng@hisilicon.com, kuhn.chenqun@huawei.com, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v1 1/6] arm64: Detect the ARMv8.4 TTL feature Message-ID: <20200421165346.GA11171@infradead.org> References: <20200403090048.938-1-yezhenyu2@huawei.com> <20200403090048.938-2-yezhenyu2@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200403090048.938-2-yezhenyu2@huawei.com> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Apr 03, 2020 at 05:00:43PM +0800, Zhenyu Ye wrote: > From: Marc Zyngier > > In order to reduce the cost of TLB invalidation, the ARMv8.4 TTL > feature allows TLBs to be issued with a level allowing for quicker > invalidation. What does "issued with a level" mean?