From patchwork Mon Jun 20 10:38:13 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Borntraeger X-Patchwork-Id: 9187403 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 59BDC607D1 for ; Mon, 20 Jun 2016 13:26:38 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 45432271FD for ; Mon, 20 Jun 2016 13:26:38 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3A1AA2684F; Mon, 20 Jun 2016 13:26:38 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 01902271FD for ; Mon, 20 Jun 2016 13:26:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753606AbcFTN0S (ORCPT ); Mon, 20 Jun 2016 09:26:18 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:65219 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753307AbcFTN0D (ORCPT ); Mon, 20 Jun 2016 09:26:03 -0400 Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.11/8.16.0.11) with SMTP id u5KAY8kE036577 for ; Mon, 20 Jun 2016 06:37:55 -0400 Received: from e06smtp05.uk.ibm.com (e06smtp05.uk.ibm.com [195.75.94.101]) by mx0b-001b2d01.pphosted.com with ESMTP id 23n2fxkgfr-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Mon, 20 Jun 2016 06:37:55 -0400 Received: from localhost by e06smtp05.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Mon, 20 Jun 2016 11:37:51 +0100 X-IBM-Helo: d06dlp01.portsmouth.uk.ibm.com X-IBM-MailFrom: borntraeger@de.ibm.com X-IBM-RcptTo: kvm@vger.kernel.org; linux-kernel@vger.kernel.org; linux-s390@vger.kernel.org Received: from b06cxnps3075.portsmouth.uk.ibm.com (d06relay10.portsmouth.uk.ibm.com [9.149.109.195]) by d06dlp01.portsmouth.uk.ibm.com (Postfix) with ESMTP id 698FC17D8056; Mon, 20 Jun 2016 11:39:06 +0100 (BST) Received: from d06av07.portsmouth.uk.ibm.com (d06av07.portsmouth.uk.ibm.com [9.149.37.248]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u5KAbore18153856; Mon, 20 Jun 2016 10:37:50 GMT Received: from d06av07.portsmouth.uk.ibm.com (localhost [127.0.0.1]) by d06av07.portsmouth.uk.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u5KAbnU6021664; Mon, 20 Jun 2016 06:37:50 -0400 Received: from tuxmaker.boeblingen.de.ibm.com (tuxmaker.boeblingen.de.ibm.com [9.152.85.9]) by d06av07.portsmouth.uk.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id u5KAbnhB021646 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Mon, 20 Jun 2016 06:37:49 -0400 Received: by tuxmaker.boeblingen.de.ibm.com (Postfix, from userid 25651) id 1CFD220F515; Mon, 20 Jun 2016 12:37:49 +0200 (CEST) From: Christian Borntraeger To: Andrew Morton , linux-mm@kvack.org Cc: Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , KVM , Cornelia Huck , linux-s390 , Christian Borntraeger , David Hildenbrand , linux-kernel@vger.kernel.org, Vlastimil Babka , Joonsoo Kim Subject: [PATCH 1/1] mm/page_ref: introduce page_ref_inc_return Date: Mon, 20 Jun 2016 12:38:13 +0200 X-Mailer: git-send-email 2.5.5 In-Reply-To: <1466419093-114348-1-git-send-email-borntraeger@de.ibm.com> References: <1466419093-114348-1-git-send-email-borntraeger@de.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16062010-0020-0000-0000-000001C4E22A X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16062010-0021-0000-0000-00001C73E46F Message-Id: <1466419093-114348-2-git-send-email-borntraeger@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2016-06-20_07:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1604210000 definitions=main-1606200123 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: David Hildenbrand Let's introduce that helper. Signed-off-by: David Hildenbrand Signed-off-by: Christian Borntraeger Acked-by: Andrew Morton --- include/linux/page_ref.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/include/linux/page_ref.h b/include/linux/page_ref.h index 8b5e0a9..610e132 100644 --- a/include/linux/page_ref.h +++ b/include/linux/page_ref.h @@ -124,6 +124,15 @@ static inline int page_ref_sub_and_test(struct page *page, int nr) return ret; } +static inline int page_ref_inc_return(struct page *page) +{ + int ret = atomic_inc_return(&page->_refcount); + + if (page_ref_tracepoint_active(__tracepoint_page_ref_mod_and_return)) + __page_ref_mod_and_return(page, 1, ret); + return ret; +} + static inline int page_ref_dec_and_test(struct page *page) { int ret = atomic_dec_and_test(&page->_refcount);