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[2003:d8:2f3f:f800:c101:5c9f:3bc9:3d08]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-40fb74e46bcsm2945522f8f.8.2025.09.25.05.45.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 25 Sep 2025 05:45:55 -0700 (PDT) Message-ID: <43ae76b9-14e2-45b9-83b0-4e5fdb6bfb3e@redhat.com> Date: Thu, 25 Sep 2025 14:45:54 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] mm/memblock: Correct totalram_pages accounting with KMSAN To: SeongJae Park , Alexander Potapenko Cc: akpm@linux-foundation.org, vbabka@suse.cz, rppt@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, elver@google.com, dvyukov@google.com, kasan-dev@googlegroups.com, Aleksandr Nogikh References: <20250925123759.59479-1-sj@kernel.org> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20250925123759.59479-1-sj@kernel.org> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: KTPIl93Mbaag43B7qpBYUrystiMLUJz9j4a-wRT4vaE_1758804356 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: AB0318000D X-Rspam-User: X-Rspamd-Server: rspam07 X-Stat-Signature: worztst6hrtbe6zgrmsnftd31xi8gc1o X-HE-Tag: 1758804359-867618 X-HE-Meta: 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 vplAVu1s 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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: On 25.09.25 14:37, SeongJae Park wrote: > Hello, > > On Wed, 24 Sep 2025 12:03:01 +0200 Alexander Potapenko wrote: > >> When KMSAN is enabled, `kmsan_memblock_free_pages()` can hold back pages >> for metadata instead of returning them to the early allocator. The callers, >> however, would unconditionally increment `totalram_pages`, assuming the >> pages were always freed. This resulted in an incorrect calculation of the >> total available RAM, causing the kernel to believe it had more memory than >> it actually did. >> >> This patch refactors `memblock_free_pages()` to return the number of pages >> it successfully frees. If KMSAN stashes the pages, the function now >> returns 0; otherwise, it returns the number of pages in the block. >> >> The callers in `memblock.c` have been updated to use this return value, >> ensuring that `totalram_pages` is incremented only by the number of pages >> actually returned to the allocator. This corrects the total RAM accounting >> when KMSAN is active. >> >> Cc: Aleksandr Nogikh >> Fixes: 3c2065098260 ("init: kmsan: call KMSAN initialization routines") >> Signed-off-by: Alexander Potapenko >> Reviewed-by: David Hildenbrand > [...] >> --- a/mm/mm_init.c >> +++ b/mm/mm_init.c >> @@ -2548,24 +2548,25 @@ void *__init alloc_large_system_hash(const char *tablename, >> return table; >> } >> >> -void __init memblock_free_pages(struct page *page, unsigned long pfn, >> - unsigned int order) >> +unsigned long __init memblock_free_pages(struct page *page, unsigned long pfn, >> + unsigned int order) >> { >> if (IS_ENABLED(CONFIG_DEFERRED_STRUCT_PAGE_INIT)) { >> int nid = early_pfn_to_nid(pfn); >> >> if (!early_page_initialised(pfn, nid)) >> - return; >> + return 0; >> } > > I found this patch on mm-new tree is making my test machine (QEMU) reports much > less MemTotal even though KMSAN is disabled. And modifying the above part to > be considered as free success (returning '1UL << order') fixed my issue. > Because the commit message says the purpose of this change is only for > KMSAN-stashed memory, maybe the above behavior change is not really intended? > > I'm not familiar with this code so I'm unsure if the workaround is the right > fix. But since I have no time to look this in deep for now, reporting first. Good point, I think there is something off here. -- Cheers David / dhildenb