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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 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 1B1CE14000F X-Stat-Signature: 93i5cq1cossryid57ae7pkezjnmi6t54 X-HE-Tag: 1754298565-541637 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 = (unsigned long)memmap; unsigned long end = (unsigned long)(memmap + PAGES_PER_SECTION); + memmap_boot_pages_add(-1L * (DIV_ROUND_UP(end - start, PAGE_SIZE))); vmemmap_free(start, end, NULL); } -- 2.48.1