From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932635AbcCIW5g (ORCPT ); Wed, 9 Mar 2016 17:57:36 -0500 Received: from mga09.intel.com ([134.134.136.24]:38828 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752693AbcCIW5a (ORCPT ); Wed, 9 Mar 2016 17:57:30 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.24,313,1455004800"; d="scan'208";a="906453585" Subject: Re: [RFC 5/9] powerpc/mm: Split huge_pte_offset function for BOOK3S 64K To: Anshuman Khandual , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org References: <1457525450-4262-1-git-send-email-khandual@linux.vnet.ibm.com> <1457525450-4262-5-git-send-email-khandual@linux.vnet.ibm.com> Cc: hughd@google.com, kirill@shutemov.name, n-horiguchi@ah.jp.nec.com, akpm@linux-foundation.org, mgorman@techsingularity.net, aneesh.kumar@linux.vnet.ibm.com, mpe@ellerman.id.au From: Dave Hansen Message-ID: <56E0AA59.4030905@intel.com> Date: Wed, 9 Mar 2016 14:57:29 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1 MIME-Version: 1.0 In-Reply-To: <1457525450-4262-5-git-send-email-khandual@linux.vnet.ibm.com> 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 03/09/2016 04:10 AM, Anshuman Khandual wrote: > Currently the 'huge_pte_offset' function has only one version for > all the configuations and platforms. This change splits the function > into two versions, one for 64K page size based BOOK3S implementation > and the other one for everything else. This change is also one of the > prerequisites towards enabling GENERAL_HUGETLB implementation for > BOOK3S 64K based huge pages. I think there's a bit of background missing here for random folks on linux-mm to make sense of these patches. What is BOOK3S and what does it mean for these patches? Why is its 64K page size implementation different than all the others? Is there a 4K page size BOOK3S?