From nobody Sat Feb 7 22:01:50 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 18DFFEB64D7 for ; Wed, 21 Jun 2023 15:50:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233583AbjFUPun (ORCPT ); Wed, 21 Jun 2023 11:50:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55742 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229645AbjFUPul (ORCPT ); Wed, 21 Jun 2023 11:50:41 -0400 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2C729C0; Wed, 21 Jun 2023 08:50:40 -0700 (PDT) Received: from pps.filterd (m0360083.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 35LFSPb1019257; Wed, 21 Jun 2023 15:50:37 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : mime-version : content-transfer-encoding; s=pp1; bh=ApW7QKwFmZ2+/cQsgFVRC7YnEf5TnKE2evhfKwNIank=; b=HNj76NOwhQFfFuLuc+Ek7NohLDHBv9zdkcRqClBwApizJ4vSR9YalXz6MfSnVgU6RbgI K5ds4dlS1+bHWr6HIMnYiArTd08DZ9hsMX29GI3ZEd4jUn5PtkcvmTkrN8pHbOQSUj1E Z2G1ZKWTzvaJPYbOHVodWnNklvUIGJJ5IskH7BZciqr7ixenFNy+qWEBsnp+NO+/zY+7 GqpX/65iIE4P+7yPqOxHnkPttsI8bO9xbt0obZpa16kWmWf4LSs5m9xH8m2bpm+3vijy oxH/WiYA6ZPMUnW8KrvUMTTj/udIKin0zsZQTXK/NiSGRykeTxzY6k5zIPYHXZkOdWDB Kw== Received: from ppma04fra.de.ibm.com (6a.4a.5195.ip4.static.sl-reverse.com [149.81.74.106]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3rc3vn0ta8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 21 Jun 2023 15:50:36 +0000 Received: from pps.filterd (ppma04fra.de.ibm.com [127.0.0.1]) by ppma04fra.de.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 35L97h1X017775; Wed, 21 Jun 2023 15:50:34 GMT Received: from smtprelay02.fra02v.mail.ibm.com ([9.218.2.226]) by ppma04fra.de.ibm.com (PPS) with ESMTPS id 3r94f5a578-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 21 Jun 2023 15:50:34 +0000 Received: from smtpav03.fra02v.mail.ibm.com (smtpav03.fra02v.mail.ibm.com [10.20.54.102]) by smtprelay02.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 35LFoUQ021496404 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 21 Jun 2023 15:50:30 GMT Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 89DD42004B; Wed, 21 Jun 2023 15:50:30 +0000 (GMT) Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0FA5720040; Wed, 21 Jun 2023 15:50:28 +0000 (GMT) Received: from tarunpc.ibmuc.com (unknown [9.43.112.18]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 21 Jun 2023 15:50:27 +0000 (GMT) From: Tarun Sahu To: nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org Cc: linux-kernel@vger.kernel.org, dave.jiang@intel.com, dan.j.williams@intel.com, vishal.l.verma@intel.com, aneesh.kumar@linux.ibm.com, jaypatel@linux.ibm.com, tsahu@linux.ibm.com Subject: [PATCH v3] dax/kmem: Pass valid argument to memory_group_register_static Date: Wed, 21 Jun 2023 21:20:25 +0530 Message-Id: <20230621155025.370672-1-tsahu@linux.ibm.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-GUID: tV9BvsWNFqM54FmnW5_1TUU7WqWGftns X-Proofpoint-ORIG-GUID: tV9BvsWNFqM54FmnW5_1TUU7WqWGftns X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-06-21_08,2023-06-16_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 spamscore=0 priorityscore=1501 impostorscore=0 suspectscore=0 bulkscore=0 lowpriorityscore=0 mlxlogscore=999 adultscore=0 clxscore=1015 phishscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2306210131 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" memory_group_register_static takes maximum number of pages as the argument while dev_dax_kmem_probe passes total_len (in bytes) as the argument. IIUC, I don't see any crash/panic impact as such. As, memory_group_register_static just set the max_pages limit which is used in auto_movable_zone_for_pfn to determine the zone. which might cause these condition to behave differently, This will be true always so jump will happen to kernel_zone ... if (!auto_movable_can_online_movable(NUMA_NO_NODE, group, nr_pages)) goto kernel_zone; ... kernel_zone: return default_kernel_zone_for_pfn(nid, pfn, nr_pages); Here, In below, zone_intersects compare range will be larger as nr_pages will be higher (derived from total_len passed in dev_dax_kmem_probe). ... static struct zone *default_kernel_zone_for_pfn(int nid, unsigned long = start_pfn, unsigned long nr_pages) { struct pglist_data *pgdat =3D NODE_DATA(nid); int zid; for (zid =3D 0; zid < ZONE_NORMAL; zid++) { struct zone *zone =3D &pgdat->node_zones[zid]; if (zone_intersects(zone, start_pfn, nr_pages)) return zone; } return &pgdat->node_zones[ZONE_NORMAL]; } Incorrect zone will be returned here, which in later time might cause bigger problem. Fixes: eedf634aac3b ("dax/kmem: use a single static memory group for a sing= le probed unit") Signed-off-by: Tarun Sahu Reviewed-by: Vishal Verma --- V3<-V2 1. Removed skip characters. V2<-V1 1. Added more details to commit message drivers/dax/kmem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dax/kmem.c b/drivers/dax/kmem.c index 7b36db6f1cbd..898ca9505754 100644 --- a/drivers/dax/kmem.c +++ b/drivers/dax/kmem.c @@ -99,7 +99,7 @@ static int dev_dax_kmem_probe(struct dev_dax *dev_dax) if (!data->res_name) goto err_res_name; =20 - rc =3D memory_group_register_static(numa_node, total_len); + rc =3D memory_group_register_static(numa_node, PFN_UP(total_len)); if (rc < 0) goto err_reg_mgid; data->mgid =3D rc; --=20 2.31.1