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=-11.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,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 2BF93C4338F for ; Wed, 28 Jul 2021 17:40:38 +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 DB7D56104F for ; Wed, 28 Jul 2021 17:40:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org DB7D56104F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=7N8r5Z9yf6Pm6PzZynSo9ra8fub4gAzlBoyyLl1ophM=; b=eIPnVT406zGds4 VkNo7zysqf2fDef+D6sbKTN9cqfByopmab4tSi/1brhnmjMYsNpnsSAbW8N7sRczBF1oBwlvcclxG 7Er40EBaay4THn28DnmZu0gBat8T7rkXKJtXNUdFZbxpXVIALYd3ZolARdF81mywWOb9UR/SbPDJ/ Mb0lv//qK8XjPHCBdRGHJ2CjezboZkY2rZ0CAGhojfNfDadTfNYmdCgqAss39FhKzNy0cXbQjtwXK qINveVj9tZ7GQdnlrq98UFooHkjd6/4ivI2HOVJCgrsh/+Ea363lbuOD/46zYDDEbyHGqiWsOyOlw bE+01k8gWuzjiV/axJjQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1m8nWA-001rou-5z; Wed, 28 Jul 2021 17:38:54 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1m8nW6-001ro6-GB for linux-arm-kernel@lists.infradead.org; Wed, 28 Jul 2021 17:38:51 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id D156E6101E; Wed, 28 Jul 2021 17:38:48 +0000 (UTC) Date: Wed, 28 Jul 2021 18:38:46 +0100 From: Catalin Marinas To: Greg Kroah-Hartman Cc: Peter Collingbourne , Vincenzo Frascino , Will Deacon , Evgenii Stepanov , Szabolcs Nagy , Tejas Belagod , linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v11 5/5] Documentation: document the preferred tag checking mode feature Message-ID: <20210728173845.GE7408@arm.com> References: <20210727205300.2554659-1-pcc@google.com> <20210727205300.2554659-6-pcc@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210728_103850_598543_D08676E8 X-CRM114-Status: GOOD ( 16.28 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Jul 28, 2021 at 08:11:00AM +0200, Greg Kroah-Hartman wrote: > On Tue, Jul 27, 2021 at 01:52:59PM -0700, Peter Collingbourne wrote: > > diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu > > index 160b10c029c0..5f87b146deb9 100644 > > --- a/Documentation/ABI/testing/sysfs-devices-system-cpu > > +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu > > @@ -640,3 +640,21 @@ Description: SPURR ticks for cpuX when it was idle. > > > > This sysfs interface exposes the number of SPURR ticks > > for cpuX when it was idle. > > + > > +What: /sys/devices/system/cpu/cpuX/mte_tcf_preferred > > +Date: July 2021 > > +Contact: Linux ARM Kernel Mailing list > > +Description: Preferred MTE tag checking mode > > + > > + When a user program specifies more than one MTE tag checking > > + mode, this sysfs node is used to specify which mode should > > + be preferred when running on that CPU. Possible values: > > + > > + ================ ============================================== > > + "sync" Prefer synchronous mode > > + "async" Prefer asynchronous mode > > + ================ ============================================== > > + > > + Changes to this sysfs node may not take effect immediately. > > Ok, so when do they take effect? A hint would be nice :) I'll go with Will suggestion below and remove this line altogether (it takes effect when scheduling a task on a CPU): https://lore.kernel.org/r/20210714115018.GE31686@willie-the-truck -- Catalin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel