From nobody Sat Apr 11 18:34:51 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 44C1DC00140 for ; Mon, 8 Aug 2022 07:37:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235494AbiHHHg7 (ORCPT ); Mon, 8 Aug 2022 03:36:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42652 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236388AbiHHHgh (ORCPT ); Mon, 8 Aug 2022 03:36:37 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0CB3013E17 for ; Mon, 8 Aug 2022 00:36:28 -0700 (PDT) Received: from pps.filterd (m0279869.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 2786w9hn008922; Mon, 8 Aug 2022 07:36:15 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=QivNZyWXfiqOkkNawU/c/GqjSwl4uGNEuQ2yxfSl+82wvQFLzvfOMrFfLufCt3ERXdcn DEkzU2CSnYm/AUAQjr4x4vV1tweGZtfvcFkrvybETGN/UCA2F4IuhuoaTMzZ44ebwCq9 OmqoMnLzn53jzz3+rSQ+GESajO4N/wLidZTV5tkklwaQ3EPZusOo5cMFt+UQyOQ+I3Dw n0CGysi5AilNEUHYVDHwF6P94VSc0u1omRuDvPMX2e4E9Teb+YdO3xViXwRH5LUUy2Gg HAMicT9yTCzIkniYkmqXB/xiGIElFMlhyA4wjH6dcVoKv35HhT241pG38Y4j8QejqE3x jA== 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 3hsfaejyhn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 08 Aug 2022 07:36:14 +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 2787aBpM021915; Mon, 8 Aug 2022 07:36:11 GMT Received: from pps.reinject (localhost [127.0.0.1]) by APTAIPPMTA01.qualcomm.com (PPS) with ESMTP id 3hshcpntf1-1; Mon, 08 Aug 2022 07:36:11 +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 2787aBH4021910; Mon, 8 Aug 2022 07:36:11 GMT Received: from maow2-gv.ap.qualcomm.com (maow2-gv.qualcomm.com [10.232.193.133]) by APTAIPPMTA01.qualcomm.com (PPS) with ESMTP id 2787aAmw021896; Mon, 08 Aug 2022 07:36:11 +0000 Received: by maow2-gv.ap.qualcomm.com (Postfix, from userid 399080) id 5B49A21029A6; Mon, 8 Aug 2022 15:36:08 +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 v4] mm/page_owner.c: add llseek for page_owner Date: Mon, 8 Aug 2022 15:36:06 +0800 Message-Id: <20220808073606.29666-1-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: NZXkGcpFxdd2u-O0Gb_QsAw1zV5mxBhd X-Proofpoint-ORIG-GUID: NZXkGcpFxdd2u-O0Gb_QsAw1zV5mxBhd 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=2022-08-08_05,2022-08-05_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 mlxscore=0 spamscore=0 lowpriorityscore=0 priorityscore=1501 suspectscore=0 adultscore=0 malwarescore=0 mlxlogscore=758 bulkscore=0 impostorscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2206140000 definitions=main-2208080038 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