From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f71.google.com (mail-pg0-f71.google.com [74.125.83.71]) by kanga.kvack.org (Postfix) with ESMTP id AD5A16B0038 for ; Thu, 2 Nov 2017 22:32:55 -0400 (EDT) Received: by mail-pg0-f71.google.com with SMTP id i196so1754902pgd.2 for ; Thu, 02 Nov 2017 19:32:55 -0700 (PDT) Received: from ozlabs.org (ozlabs.org. [103.22.144.67]) by mx.google.com with ESMTPS id o29si5368468pfi.90.2017.11.02.19.32.50 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 02 Nov 2017 19:32:50 -0700 (PDT) From: Michael Ellerman Subject: Re: [PATCH 02/15] mm, dax: introduce pfn_t_special() In-Reply-To: <150949210553.24061.5992572975056748512.stgit@dwillia2-desk3.amr.corp.intel.com> References: <150949209290.24061.6283157778959640151.stgit@dwillia2-desk3.amr.corp.intel.com> <150949210553.24061.5992572975056748512.stgit@dwillia2-desk3.amr.corp.intel.com> Date: Fri, 03 Nov 2017 13:32:44 +1100 Message-ID: <87ines6qib.fsf@concordia.ellerman.id.au> MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: Dan Williams , linux-nvdimm@lists.01.org Cc: Benjamin Herrenschmidt , Heiko Carstens , linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-mm@kvack.org, Paul Mackerras , Martin Schwidefsky , linux-fsdevel@vger.kernel.org, akpm@linux-foundation.org, hch@lst.de, Arnd Bergmann Dan Williams writes: > In support of removing the VM_MIXEDMAP indication from DAX VMAs, > introduce pfn_t_special() for drivers to indicate that _PAGE_SPECIAL > should be used for DAX ptes. This also helps identify drivers like > dccssblk that only want to use DAX in a read-only fashion without > get_user_pages() support. > > Ideally we could delete axonram and dcssblk DAX support, but if we need > to keep it better make it explicit that axonram and dcssblk only support > a sub-set of DAX due to missing _PAGE_DEVMAP support. I sent a patch to remove axonram (sorry meant to Cc you): http://patchwork.ozlabs.org/patch/833588/ Will see if there's any feedback. cheers -- 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