From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by lists.ozlabs.org (Postfix) with ESMTP id 7FB3A1A0060 for ; Thu, 10 Mar 2016 09:57:31 +1100 (AEDT) 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 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 List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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?