From nobody Thu Dec 18 17:44:35 2025 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 6D302C5AD4C for ; Mon, 20 Nov 2023 10:28:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233119AbjKTK2N (ORCPT ); Mon, 20 Nov 2023 05:28:13 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42324 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232305AbjKTK2G (ORCPT ); Mon, 20 Nov 2023 05:28:06 -0500 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A899BA0; Mon, 20 Nov 2023 02:28:00 -0800 (PST) Received: from pps.filterd (m0356516.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 3AKA9ab1008039; Mon, 20 Nov 2023 10:27:49 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : content-transfer-encoding : mime-version; s=pp1; bh=YuByY8UcYVe/2pEd+OXjEA/TKfRRXD0L4gZpHO5Zb+c=; b=fQ8tHwWbTtNepEiyf8FAlx5ZNOsU1NSYcKwGQLeasfjjpjc1YomQLQ9jhf1zrJwqVYaq JCfcWMbXzX4Bvhk3fZs8WbfhcXHup1/mo9nPE5qFgepaJPSS33RvK6bYw3y9vYNOQTfO haWG6sUkoob80g/tX8T4THCQGauLU/c8ahbXfvi5wARiV0Sh4qKQA3LGDcg4irjoq/nj GJF66MCkjLgzlrJ0XX92BZ5LFtEuVDGrPm/ICYmTYt41F+MYdjOFMLqWOIzpUJvpySZr gjlCEB2jVlW+6CKWN4i2xwVB3gb5seFgsgEupnTIbumA1PXmHKf0Cssx/k/no/dNjbAq QQ== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3ug5f68nv4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 20 Nov 2023 10:27:49 +0000 Received: from m0356516.ppops.net (m0356516.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 3AKA9d7T008206; Mon, 20 Nov 2023 10:27:48 GMT Received: from ppma12.dal12v.mail.ibm.com (dc.9e.1632.ip4.static.sl-reverse.com [50.22.158.220]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3ug5f68nuc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 20 Nov 2023 10:27:48 +0000 Received: from pps.filterd (ppma12.dal12v.mail.ibm.com [127.0.0.1]) by ppma12.dal12v.mail.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 3AKAJlsc028315; Mon, 20 Nov 2023 10:27:48 GMT Received: from smtprelay02.fra02v.mail.ibm.com ([9.218.2.226]) by ppma12.dal12v.mail.ibm.com (PPS) with ESMTPS id 3uf7ksrs6u-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 20 Nov 2023 10:27:47 +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 3AKARjtA16319228 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 20 Nov 2023 10:27:45 GMT Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3CCEF20043; Mon, 20 Nov 2023 10:27:45 +0000 (GMT) Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 044B32004E; Mon, 20 Nov 2023 10:27:45 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 20 Nov 2023 10:27:44 +0000 (GMT) From: Sumanth Korikkar To: linux-mm , Andrew Morton , David Hildenbrand Cc: Oscar Salvador , Michal Hocko , "Aneesh Kumar K.V" , Anshuman Khandual , Gerald Schaefer , Alexander Gordeev , Heiko Carstens , Vasily Gorbik , linux-s390 , LKML , Subject: [PATCH v2 3/3] mm: use vmem_altmap code without CONFIG_ZONE_DEVICE Date: Mon, 20 Nov 2023 11:27:34 +0100 Message-Id: <20231120102734.2001576-4-sumanthk@linux.ibm.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231120102734.2001576-1-sumanthk@linux.ibm.com> References: <20231120102734.2001576-1-sumanthk@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: YUzjKIfFsqOrpbts2GRzQdmR2_ToRB-W X-Proofpoint-GUID: GxddkNpk9q-fOwTroGesLN7lVj1DNFDi Content-Transfer-Encoding: quoted-printable X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.987,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-11-20_08,2023-11-17_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 lowpriorityscore=0 priorityscore=1501 bulkscore=0 malwarescore=0 mlxscore=0 suspectscore=0 clxscore=1015 phishscore=0 impostorscore=0 adultscore=0 mlxlogscore=645 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2311200069 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" vmem_altmap_free() and vmem_altmap_offset() could be utlized without CONFIG_ZONE_DEVICE enabled. For example, mm/memory_hotplug.c:__add_pages() relies on that. The altmap is no longer restricted to ZONE_DEVICE handling, but instead depends on CONFIG_SPARSEMEM_VMEMMAP. When CONFIG_SPARSEMEM_VMEMMAP is disabled, these functions are defined as inline stubs, ensuring compatibility with configurations that do not use sparsemem vmemmap. Without it, lkp reported the following: ld: arch/x86/mm/init_64.o: in function `remove_pagetable': init_64.c:(.meminit.text+0xfc7): undefined reference to `vmem_altmap_free' Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202311180545.VeyRXEDq-lkp@int= el.com/ Reviewed-by: Gerald Schaefer Signed-off-by: Sumanth Korikkar Acked-by: David Hildenbrand --- include/linux/memremap.h | 12 ------------ include/linux/mm.h | 26 ++++++++++++++++++++++++++ mm/memremap.c | 14 +------------- 3 files changed, 27 insertions(+), 25 deletions(-) diff --git a/include/linux/memremap.h b/include/linux/memremap.h index 1314d9c5f05b..744c830f4b13 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -196,8 +196,6 @@ struct dev_pagemap *get_dev_pagemap(unsigned long pfn, struct dev_pagemap *pgmap); bool pgmap_pfn_valid(struct dev_pagemap *pgmap, unsigned long pfn); =20 -unsigned long vmem_altmap_offset(struct vmem_altmap *altmap); -void vmem_altmap_free(struct vmem_altmap *altmap, unsigned long nr_pfns); unsigned long memremap_compat_align(void); #else static inline void *devm_memremap_pages(struct device *dev, @@ -228,16 +226,6 @@ static inline bool pgmap_pfn_valid(struct dev_pagemap = *pgmap, unsigned long pfn) return false; } =20 -static inline unsigned long vmem_altmap_offset(struct vmem_altmap *altmap) -{ - return 0; -} - -static inline void vmem_altmap_free(struct vmem_altmap *altmap, - unsigned long nr_pfns) -{ -} - /* when memremap_pages() is disabled all archs can remap a single page */ static inline unsigned long memremap_compat_align(void) { diff --git a/include/linux/mm.h b/include/linux/mm.h index bf5d0b1b16f4..f2344fd8acbe 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3786,6 +3786,32 @@ void vmemmap_free(unsigned long start, unsigned long= end, struct vmem_altmap *altmap); #endif =20 +#ifdef CONFIG_SPARSEMEM_VMEMMAP +static inline unsigned long vmem_altmap_offset(struct vmem_altmap *altmap) +{ + /* number of pfns from base where pfn_to_page() is valid */ + if (altmap) + return altmap->reserve + altmap->free; + return 0; +} + +static inline void vmem_altmap_free(struct vmem_altmap *altmap, + unsigned long nr_pfns) +{ + altmap->alloc -=3D nr_pfns; +} +#else +static inline unsigned long vmem_altmap_offset(struct vmem_altmap *altmap) +{ + return 0; +} + +static inline void vmem_altmap_free(struct vmem_altmap *altmap, + unsigned long nr_pfns) +{ +} +#endif + #define VMEMMAP_RESERVE_NR 2 #ifdef CONFIG_ARCH_WANT_OPTIMIZE_DAX_VMEMMAP static inline bool __vmemmap_can_optimize(struct vmem_altmap *altmap, diff --git a/mm/memremap.c b/mm/memremap.c index bee85560a243..9531faa92a7c 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -7,6 +7,7 @@ #include #include #include +#include #include #include #include @@ -422,19 +423,6 @@ void devm_memunmap_pages(struct device *dev, struct de= v_pagemap *pgmap) } EXPORT_SYMBOL_GPL(devm_memunmap_pages); =20 -unsigned long vmem_altmap_offset(struct vmem_altmap *altmap) -{ - /* number of pfns from base where pfn_to_page() is valid */ - if (altmap) - return altmap->reserve + altmap->free; - return 0; -} - -void vmem_altmap_free(struct vmem_altmap *altmap, unsigned long nr_pfns) -{ - altmap->alloc -=3D nr_pfns; -} - /** * get_dev_pagemap() - take a new live reference on the dev_pagemap for @p= fn * @pfn: page frame number to lookup page_map --=20 2.41.0