From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io0-f199.google.com (mail-io0-f199.google.com [209.85.223.199]) by kanga.kvack.org (Postfix) with ESMTP id AE0EF6B02C4 for ; Mon, 24 Apr 2017 18:09:53 -0400 (EDT) Received: by mail-io0-f199.google.com with SMTP id f66so222659190ioe.12 for ; Mon, 24 Apr 2017 15:09:53 -0700 (PDT) Received: from shards.monkeyblade.net (shards.monkeyblade.net. [184.105.139.130]) by mx.google.com with ESMTP id x64si6891352iof.38.2017.04.24.15.09.52 for ; Mon, 24 Apr 2017 15:09:52 -0700 (PDT) Date: Mon, 24 Apr 2017 18:09:48 -0400 (EDT) Message-Id: <20170424.180948.1311847745777709716.davem@davemloft.net> Subject: Re: Question on the five-level page table support patches From: David Miller In-Reply-To: References: <030ea57b-5f6c-13d8-02f7-b245a754a87d@physik.fu-berlin.de> <20170424161959.c5ba2nhnxyy57wxe@node.shutemov.name> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: glaubitz@physik.fu-berlin.de Cc: kirill@shutemov.name, kirill.shutemov@linux.intel.com, linux-kernel@vger.kernel.org, ak@linux.intel.com, dave.hansen@intel.com, luto@amacapital.net, mhocko@suse.com, linux-arch@vger.kernel.org, linux-mm@kvack.org From: John Paul Adrian Glaubitz Date: Mon, 24 Apr 2017 22:37:40 +0200 > Would be really nice to able to have a canonical solution for this issue, > it's been biting us on SPARC for quite a while now due to the fact that > virtual address space has been 52 bits on SPARC for a while now. It's going to break again with things like ADI which encode protection keys in the high bits of the 64-bit virtual address. Reallly, it would be nice if these tags were instead encoded in the low bits of suitably aligned memory allocations but I am sure it's to late to do that now. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org