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"open list:XFS FILESYSTEM" , Dave Chinner , Linux Kernel Mailing List , Jens Axboe , Christoph Lameter , Linus Torvalds , Greg Kroah-Hartman References: <20180920063129.GB12913@lst.de> <87h8ij0zot.fsf@vitty.brq.redhat.com> <20180923224206.GA13618@ming.t460p> <38c03920-0fd0-0a39-2a6e-70cd8cb4ef34@virtuozzo.com> <20a20568-5089-541d-3cee-546e549a0bc8@acm.org> <12eee877-affa-c822-c9d5-fda3aa0a50da@virtuozzo.com> <1537801706.195115.7.camel@acm.org> <1537804720.195115.9.camel@acm.org> From: Andrey Ryabinin Message-ID: <10c706fd-2252-f11b-312e-ae0d97d9a538@virtuozzo.com> Date: Mon, 24 Sep 2018 19:07:18 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <1537804720.195115.9.camel@acm.org> Content-Type: text/plain; charset=UTF-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [185.231.240.5] X-ClientProxiedBy: DB6P193CA0022.EURP193.PROD.OUTLOOK.COM (2603:10a6:6:29::32) To 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X-Microsoft-Exchange-Diagnostics: 1;VI1PR08MB3264;20:HjSH29EMwi4pklrFn++Fa/2ehfb5eJ+NflK4ABpKbM0LiYZksiCA7RdDv1y7yLaRIUdeE6FqVXQNqQgjW5fQ+6ViOyNzmRqc+lzClP3XQHCaXBI3EUUXA/WQtFXprf4INOO4zbll34O+H51W1Sfd8WlYnYRnt19HARY9FSKC3kw= X-OriginatorOrg: virtuozzo.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Sep 2018 16:06:55.0336 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e8315d83-8cee-465a-3f00-08d62237c080 X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 0bc7f26d-0264-416e-a6fc-8352af79c58f X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR08MB3264 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/24/2018 06:58 PM, Bart Van Assche wrote: > On Mon, 2018-09-24 at 18:52 +0300, Andrey Ryabinin wrote: >> Yes, with CONFIG_DEBUG_SLAB=y, CONFIG_SLUB_DEBUG_ON=y kmalloc() guarantees >> that result is aligned on ARCH_KMALLOC_MINALIGN boundary. > > Had you noticed that Vitaly Kuznetsov showed that this is not the case? See > also https://lore.kernel.org/lkml/87h8ij0zot.fsf@vitty.brq.redhat.com/. > I'm not following. On x86-64 ARCH_KMALLOC_MINALIGN is 8, all pointers that Vitaly Kuznetsov showed are 8-byte aligned. > Thanks, > > Bart. >