From patchwork Wed Mar 9 12:10:43 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anshuman Khandual X-Patchwork-Id: 595033 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [103.22.144.68]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id EA1B31402DE for ; Wed, 9 Mar 2016 23:14:25 +1100 (AEDT) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id D00261A0B81 for ; Wed, 9 Mar 2016 23:14:25 +1100 (AEDT) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Received: from e23smtp09.au.ibm.com (e23smtp09.au.ibm.com [202.81.31.142]) (using TLSv1.2 with cipher CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 8D9D51A004B for ; Wed, 9 Mar 2016 23:11:55 +1100 (AEDT) Received: from localhost by e23smtp09.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Wed, 9 Mar 2016 22:11:51 +1000 X-IBM-Helo: d23dlp03.au.ibm.com X-IBM-MailFrom: khandual@linux.vnet.ibm.com X-IBM-RcptTo: linuxppc-dev@lists.ozlabs.org Received: from d23relay09.au.ibm.com (d23relay09.au.ibm.com [9.185.63.181]) by d23dlp03.au.ibm.com (Postfix) with ESMTP id 3A271357805A for ; Wed, 9 Mar 2016 23:11:46 +1100 (EST) Received: from d23av01.au.ibm.com (d23av01.au.ibm.com [9.190.234.96]) by d23relay09.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u29CBcJg33685654 for ; Wed, 9 Mar 2016 23:11:46 +1100 Received: from d23av01.au.ibm.com (localhost [127.0.0.1]) by d23av01.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u29CBC6a021393 for ; Wed, 9 Mar 2016 23:11:13 +1100 Received: from localhost.in.ibm.com ([9.124.158.118]) by d23av01.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id u29CB7QL020798; Wed, 9 Mar 2016 23:11:10 +1100 From: Anshuman Khandual To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: [RFC 2/9] mm/hugetlb: Add follow_huge_pgd function Date: Wed, 9 Mar 2016 17:40:43 +0530 Message-Id: <1457525450-4262-2-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: 16030912-0033-0000-0000-0000031FB27C X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: hughd@google.com, aneesh.kumar@linux.vnet.ibm.com, kirill@shutemov.name, n-horiguchi@ah.jp.nec.com, mgorman@techsingularity.net, akpm@linux-foundation.org MIME-Version: 1.0 Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" This just adds 'follow_huge_pgd' function which is will be used later in this series to make 'follow_page_mask' function aware of PGD based huge page implementation. Signed-off-by: Anshuman Khandual --- include/linux/hugetlb.h | 3 +++ mm/hugetlb.c | 10 ++++++++++ 2 files changed, 13 insertions(+) diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 7d953c2..71832e1 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -115,6 +115,8 @@ struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, pmd_t *pmd, int flags); struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address, pud_t *pud, int flags); +struct page *follow_huge_pgd(struct mm_struct *mm, unsigned long address, + pgd_t *pgd, int flags); int pmd_huge(pmd_t pmd); int pud_huge(pud_t pmd); unsigned long hugetlb_change_protection(struct vm_area_struct *vma, @@ -143,6 +145,7 @@ static inline void hugetlb_show_meminfo(void) } #define follow_huge_pmd(mm, addr, pmd, flags) NULL #define follow_huge_pud(mm, addr, pud, flags) NULL +#define follow_huge_pgd(mm, addr, pgd, flags) NULL #define prepare_hugepage_range(file, addr, len) (-EINVAL) #define pmd_huge(x) 0 #define pud_huge(x) 0 diff --git a/mm/hugetlb.c b/mm/hugetlb.c index a478b7b..844c18f 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -4353,6 +4353,16 @@ follow_huge_pud(struct mm_struct *mm, unsigned long address, return pte_page(*(pte_t *)pud) + ((address & ~PUD_MASK) >> PAGE_SHIFT); } +struct page * __weak +follow_huge_pgd(struct mm_struct *mm, unsigned long address, + pgd_t *pgd, int flags) +{ + if (flags & FOLL_GET) + return NULL; + + return pte_page(*(pte_t *)pgd) + ((address & ~PGDIR_MASK) >> PAGE_SHIFT); +} + #ifdef CONFIG_MEMORY_FAILURE /*