From nobody Sun Oct 5 12:36:43 2025 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2B7CB1FAC4E; Mon, 4 Aug 2025 09:09:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.158.5 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754298573; cv=none; b=EbZZrOuqIQEnaCYay0gxphYKekbc31ys7NqJrCFMjysw5XrpggMZ/JE8EPwjjIjZUYxVc+9r4RhLHJCf+Jov32DgD1ur07Lzk2lSZ5paFbx6u/KCm4YBjDZ+rliw8xVcFySU1/bUxopObektaMHFRaXWu1WpqKYzwNAJw+CNfOQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754298573; c=relaxed/simple; bh=LXaJJmPQqXnbL/bmZnzqXb0txLVlMmOtBWlErQC9Kr4=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=B/XP+1cT2O0cZ5DFdqALpRcdjvmcvmTseSQSfx4NwwxXKvhP/OGBWp5m7xRAz9FotZ5sMVR8rVXU6XhyklSDIoVBdzFOduCJ0TwBIzn7ErFPpDT3JMuoAOEu/30xtUlgHy2T+qnYaNlO4SoDergi3Uj1zNIcUEpQIPwoRpSlr00= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; spf=pass smtp.mailfrom=linux.ibm.com; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b=fWb3SHUg; arc=none smtp.client-ip=148.163.158.5 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="fWb3SHUg" Received: from pps.filterd (m0360072.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 573Kfcls029457; Mon, 4 Aug 2025 09:09:25 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:date:from:message-id:mime-version :subject:to; s=pp1; bh=DAQV0AwXeHE/PwMvOBgIQg+ASlsQc1X48WemPBpqA p8=; b=fWb3SHUg47YjoUVNywFxRPTsnu/Wezkhd2rU3UvNgA/pAP9FTpxFEjxPP Agd74NEokr2BHiA6vSZJMZgYBju4FucUXFjPRAzUZwyrx+KPfsM1gu4UhYThI71s YV3FCGqacauCfc6SfG79AT+Wx9yUaRNMDtdng+I2y6tEw1MIJR2ArWXQ+5Adk8EO 7ebYvx4Ef+xuMq0qx/jl3D4jZysMZ5OASnA7UH3YbM5UPdrrDPM93GSr0Qyvfkth 6MNukVXhEZWT/NnbBeUZ2Oj3L7MJWls/vEFLGOcGUum9r5i3H2Ke9wBuH61bGe5l fnJ5ObrkB2Be0iVkRbHr3YmM3FLsQ== Received: from ppma22.wdc07v.mail.ibm.com (5c.69.3da9.ip4.static.sl-reverse.com [169.61.105.92]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 489ab3fxj8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 04 Aug 2025 09:09:25 +0000 (GMT) Received: from pps.filterd (ppma22.wdc07v.mail.ibm.com [127.0.0.1]) by ppma22.wdc07v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 5745fU3C002484; Mon, 4 Aug 2025 09:09:24 GMT Received: from smtprelay02.fra02v.mail.ibm.com ([9.218.2.226]) by ppma22.wdc07v.mail.ibm.com (PPS) with ESMTPS id 489wcyw3qq-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 04 Aug 2025 09:09:24 +0000 Received: from smtpav07.fra02v.mail.ibm.com (smtpav07.fra02v.mail.ibm.com [10.20.54.106]) by smtprelay02.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 57499Kxs47776186 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 4 Aug 2025 09:09:20 GMT Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1CC542033F; Mon, 4 Aug 2025 09:09:20 +0000 (GMT) Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3C95B2034D; Mon, 4 Aug 2025 09:09:14 +0000 (GMT) Received: from tuxmaker.lnxne.boe (unknown [9.152.85.9]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 4 Aug 2025 09:09:14 +0000 (GMT) From: Sumanth Korikkar To: Andrew Morton , linux-mm , LKML , David Hildenbrand Cc: Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , linux-s390 , sumanthk@linux.ibm.com Subject: [PATCH] mm: fix accounting of memmap pages for early sections Date: Mon, 4 Aug 2025 11:08:59 +0200 Message-ID: <20250804090859.727207-1-sumanthk@linux.ibm.com> X-Mailer: git-send-email 2.48.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=Z+jsHGRA c=1 sm=1 tr=0 ts=689078c5 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=2OwXVqhp2XgA:10 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=KawUSfIWrfKEQJWuwW8A:9 X-Proofpoint-ORIG-GUID: Mqcg8VsFLq_ouAd6ooDn7elCav4_qeSW X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODA0MDA0NyBTYWx0ZWRfX69T6gTqLTtTk gNMtzS5VDmmjbCVGiGeAdc3H4texRhpBLJQusvAaX1ZmQNPnsBfeEAR5VHx7tNOeOwFAWyiCbhn QU48qNiDoEWQr+TkTLD2/mO4hRvUJBIGQ9dFDBjp4gwhhS0WSifIZpx2HigXqXM/xoDS4OkhfhL tfNHl+IvS2r75+pLnwBMV0jGKqia+H7O2gzwgEk0LmlqxS1N9mqO++gpN5jYcxDTZPDCz8epJmW puCNvnRlC46oejNbzP5yjH1OBJresuJWBv70SZQSZ6OCzxpCjkEDG0UsciM/93/CebN27iOtrIB BZiQnu+gV6MA7dQgAVr9TAYCVhgUIHzZGK9xsswwHO8n7rFKSCWoP+BtZndpSOkU0OGqQ2zHRG0 ZEkd2KVmhWrOjPBx6Gk4VSb08FA274TH4Hw3huVDjJA9D7wyV1nrx4S7t4Hd5He5rZJlajS8 X-Proofpoint-GUID: Mqcg8VsFLq_ouAd6ooDn7elCav4_qeSW X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-08-04_03,2025-08-04_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 spamscore=0 malwarescore=0 clxscore=1011 suspectscore=0 priorityscore=1501 mlxlogscore=434 adultscore=0 phishscore=0 mlxscore=0 bulkscore=0 impostorscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2508040047 Content-Type: text/plain; charset="utf-8" memmap pages can be allocated either from the memblock (boot) allocator during early boot or from the buddy allocator. When these memmap pages are removed via arch_remove_memory(), the deallocation path depends on their source: * For pages from the buddy allocator, depopulate_section_memmap() is called, which also decrements the count of nr_memmap_pages. * For pages from the boot allocator, free_map_bootmem() is called. But it currently does not adjust the nr_memmap_boot_pages. To fix this inconsistency, update free_map_bootmem() to also decrement the nr_memmap_boot_pages count by invoking memmap_boot_pages_add(), mirroring how free_vmemmap_page() handles this for boot-allocated pages. This ensures correct tracking of memmap pages regardless of allocation source. Cc: stable@vger.kernel.org Fixes: 15995a352474 ("mm: report per-page metadata information") Signed-off-by: Sumanth Korikkar --- mm/sparse.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/sparse.c b/mm/sparse.c index 3c012cf83cc2..d7c128015397 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -688,6 +688,7 @@ static void free_map_bootmem(struct page *memmap) unsigned long start =3D (unsigned long)memmap; unsigned long end =3D (unsigned long)(memmap + PAGES_PER_SECTION); =20 + memmap_boot_pages_add(-1L * (DIV_ROUND_UP(end - start, PAGE_SIZE))); vmemmap_free(start, end, NULL); } =20 --=20 2.48.1