From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S967736AbdADXlA (ORCPT ); Wed, 4 Jan 2017 18:41:00 -0500 Received: from mga09.intel.com ([134.134.136.24]:43418 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750822AbdADXk4 (ORCPT ); Wed, 4 Jan 2017 18:40:56 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.33,318,1477983600"; d="scan'208";a="26268622" Subject: Re: [RFC PATCH v3] sparc64: Add support for Application Data Integrity (ADI) To: Rob Gardner , Khalid Aziz , davem@davemloft.net, corbet@lwn.net, arnd@arndb.de, akpm@linux-foundation.org References: <1483569999-13543-1-git-send-email-khalid.aziz@oracle.com> <6fcaab9f-40fb-fdfb-2c7e-bf21a862ab7c@linux.intel.com> Cc: hpa@zytor.com, viro@zeniv.linux.org.uk, nitin.m.gupta@oracle.com, chris.hyser@oracle.com, tushar.n.dave@oracle.com, sowmini.varadhan@oracle.com, mike.kravetz@oracle.com, adam.buchbinder@gmail.com, minchan@kernel.org, hughd@google.com, kirill.shutemov@linux.intel.com, keescook@chromium.org, allen.pais@oracle.com, aryabinin@virtuozzo.com, atish.patra@oracle.com, joe@perches.com, pmladek@suse.com, jslaby@suse.cz, cmetcalf@mellanox.com, paul.gortmaker@windriver.com, mhocko@suse.com, jmarchan@redhat.com, lstoakes@gmail.com, 0x7f454c46@gmail.com, vbabka@suse.cz, tglx@linutronix.de, mingo@redhat.com, dan.j.williams@intel.com, iamjoonsoo.kim@lge.com, mgorman@techsingularity.net, vdavydov.dev@gmail.com, hannes@cmpxchg.org, namit@vmware.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, x86@kernel.org, linux-mm@kvack.org, Khalid Aziz From: Dave Hansen Message-ID: Date: Wed, 4 Jan 2017 15:40:23 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 01/04/2017 03:35 PM, Rob Gardner wrote: > Tags are not cleared at all when memory is freed, but rather, lazily > (and automatically) cleared when memory is allocated. What does "allocated" mean in this context? Physical or virtual? What does this do, for instance? ptr = malloc(PAGE_SIZE); set_tag(ptr, 14); madvise(ptr, PAGE_SIZE, MADV_FREE); printf("tag: %d\n", get_tag(ptr)); free(ptr);