Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932384AbcCIMMJ (ORCPT ); Wed, 9 Mar 2016 07:12:09 -0500 Received: from e23smtp03.au.ibm.com ([202.81.31.145]:40886 "EHLO e23smtp03.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753555AbcCIMLz (ORCPT ); Wed, 9 Mar 2016 07:11:55 -0500 X-IBM-Helo: d23dlp01.au.ibm.com X-IBM-MailFrom: khandual@linux.vnet.ibm.com X-IBM-RcptTo: linux-kernel@vger.kernel.org From: Anshuman Khandual To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org 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 Subject: [RFC 3/9] mm/gup: Make follow_page_mask function PGD implementation aware Date: Wed, 9 Mar 2016 17:40:44 +0530 Message-Id: <1457525450-4262-3-git-send-email-khandual@linux.vnet.ibm.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1457525450-4262-1-git-send-email-khandual@linux.vnet.ibm.com> References: <1457525450-4262-1-git-send-email-khandual@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16030912-0009-0000-0000-0000032C1C8D Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 813 Lines: 28 Currently the function 'follow_page_mask' does not take into account PGD based huge page implementation. This change achieves that and makes it complete. Signed-off-by: Anshuman Khandual --- mm/gup.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/gup.c b/mm/gup.c index 7bf19ff..53a2013 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -232,6 +232,12 @@ struct page *follow_page_mask(struct vm_area_struct *vma, pgd = pgd_offset(mm, address); if (pgd_none(*pgd) || unlikely(pgd_bad(*pgd))) return no_page_table(vma, flags); + if (pgd_huge(*pgd) && vma->vm_flags & VM_HUGETLB) { + page = follow_huge_pgd(mm, address, pgd, flags); + if (page) + return page; + return no_page_table(vma, flags); + } pud = pud_offset(pgd, address); if (pud_none(*pud)) -- 2.1.0