From nobody Sun Apr 12 04:23:03 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6F91DC00144 for ; Tue, 2 Aug 2022 01:12:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234867AbiHBBME (ORCPT ); Mon, 1 Aug 2022 21:12:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44656 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234746AbiHBBMA (ORCPT ); Mon, 1 Aug 2022 21:12:00 -0400 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8C16B25EAC for ; Mon, 1 Aug 2022 18:11:59 -0700 (PDT) Received: from pps.filterd (m0279865.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 2720xhxu005342; Tue, 2 Aug 2022 01:11:46 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id; s=qcppdkim1; bh=+XCm5jSg8FjQE5YqGwyyuso1tjrDjKrNMsCGsTXDJYg=; b=QdWS/6iBAAklD4za1JISNXcob7ukHqpue2gGjpKs8lnatHhIzD/nkUklvAeGTby2b5oV mO9UY1QA1pl2XnZyohS5UQCyWCJgXxvtl1z+Y9+V9Lx+NureLsexK9/hEVVMtD3S8cJR rpw2cbFQ0s3GK8yRlWGgk0RdzAp79/Y2IIt8tvQLyQzYGeB512HYQWRpxrbXP88VvP93 5OljZm50+3iK9AOagj+Feubp8ML4oYAgv5D7u7h6Rb124MCzL8kmVqOBcZEC/N0cJFem 138k20VkXGzEtZVFDuww/hcAQR/gJtDh9uCKg2uyTm4L+TvmdhTG29ir3qtwlFakAfJ3 3A== Received: from aptaippmta01.qualcomm.com (tpe-colo-wan-fw-bordernet.qualcomm.com [103.229.16.4]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3hphfbh0wm-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 02 Aug 2022 01:11:46 +0000 Received: from pps.filterd (APTAIPPMTA01.qualcomm.com [127.0.0.1]) by APTAIPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTP id 27216hJ5029661; Tue, 2 Aug 2022 01:06:43 GMT Received: from pps.reinject (localhost [127.0.0.1]) by APTAIPPMTA01.qualcomm.com (PPS) with ESMTP id 3hmwqnqv6k-1; Tue, 02 Aug 2022 01:06:43 +0000 Received: from APTAIPPMTA01.qualcomm.com (APTAIPPMTA01.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 27216hXT029656; Tue, 2 Aug 2022 01:06:43 GMT Received: from maow2-gv.ap.qualcomm.com (maow2-gv.qualcomm.com [10.232.193.133]) by APTAIPPMTA01.qualcomm.com (PPS) with ESMTP id 27216gnm029653; Tue, 02 Aug 2022 01:06:43 +0000 Received: by maow2-gv.ap.qualcomm.com (Postfix, from userid 399080) id 9C66C21029A6; Tue, 2 Aug 2022 09:06:41 +0800 (CST) From: Kassey Li To: akpm@linux-foundation.org, vbabka@kernel.org Cc: Kassey Li , minchan@kernel.org, iamjoonsoo.kim@lge.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v3] mm/page_owner.c: add llseek for page_owner Date: Tue, 2 Aug 2022 09:06:40 +0800 Message-Id: <20220802010640.26937-1-quic_yingangl@quicinc.com> X-Mailer: git-send-email 2.17.1 X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: OQB56bczKuKnXRj0Ch0ep3tLxqx5K73m X-Proofpoint-ORIG-GUID: OQB56bczKuKnXRj0Ch0ep3tLxqx5K73m X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-01_12,2022-08-01_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 phishscore=0 mlxlogscore=769 impostorscore=0 clxscore=1015 mlxscore=0 malwarescore=0 priorityscore=1501 bulkscore=0 adultscore=0 spamscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2206140000 definitions=main-2208020003 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" There is usage to dump a given cma region page_owner instead of all page's. This change allows to specify a ppos as start_pfn by fseek. Any invalid ppos will be skipped, so it did not broken the origin dump feature. Suggested-by: Vlastimil Babka (SUSE) Signed-off-by: Kassey Li --- mm/page_owner.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/mm/page_owner.c b/mm/page_owner.c index e4c6f3f1695b..231b1877af99 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -497,8 +497,8 @@ read_page_owner(struct file *file, char __user *buf, si= ze_t count, loff_t *ppos) return -EINVAL; =20 page =3D NULL; - pfn =3D min_low_pfn + *ppos; =20 + pfn =3D *ppos; /* Find a valid PFN or the start of a MAX_ORDER_NR_PAGES area */ while (!pfn_valid(pfn) && (pfn & (MAX_ORDER_NR_PAGES - 1)) !=3D 0) pfn++; @@ -561,7 +561,7 @@ read_page_owner(struct file *file, char __user *buf, si= ze_t count, loff_t *ppos) continue; =20 /* Record the next PFN to read in the file offset */ - *ppos =3D (pfn - min_low_pfn) + 1; + *ppos =3D pfn + 1; =20 return print_page_owner(buf, count, pfn, page, page_owner, handle); @@ -570,6 +570,21 @@ read_page_owner(struct file *file, char __user *buf, s= ize_t count, loff_t *ppos) return 0; } =20 +static loff_t llseek_page_owner(struct file *file, loff_t offset, int when= ce) +{ + loff_t retval =3D 0; + switch (whence) { + case SEEK_CUR: + case SEEK_SET: + file->f_pos =3D offset; + break; + default: + retval =3D -ENXIO; + } + + return retval; +} + static void init_pages_in_zone(pg_data_t *pgdat, struct zone *zone) { unsigned long pfn =3D zone->zone_start_pfn; @@ -660,6 +675,7 @@ static void init_early_allocated_pages(void) =20 static const struct file_operations proc_page_owner_operations =3D { .read =3D read_page_owner, + .llseek =3D llseek_page_owner, }; =20 static int __init pageowner_init(void) --=20 2.17.1