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[149.14.88.26]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-429952b79cbsm24944885f8f.4.2025.10.29.01.25.25 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 29 Oct 2025 01:25:26 -0700 (PDT) Message-ID: Date: Wed, 29 Oct 2025 09:25:25 +0100 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: powerpc/e500: WARNING: at mm/hugetlb.c:4755 hugetlb_add_hstate To: Sourabh Jain , Madhavan Srinivasan , "Ritesh Harjani (IBM)" , linuxppc-dev Cc: Christophe Leroy , Donet Tom , Andrew Morton References: <94377f5c-d4f0-4c0f-b0f6-5bf1cd7305b1@linux.ibm.com> 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: <94377f5c-d4f0-4c0f-b0f6-5bf1cd7305b1@linux.ibm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: PAG3fA9LtQ1M4rR8uaRTfbbAKuu3HVKABHEehNYEYHg_1761726327 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 29.10.25 06:49, Sourabh Jain wrote: > Kernel is printing below warning while booting: > > > WARNING: CPU: 0 PID: 1 at mm/hugetlb.c:4753 hugetlb_add_hstate+0xc0/0x180 > Modules linked in: > CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted > 6.18.0-rc1-01400-ga297f72c4951 #6 NONE > Hardware name: QEMU ppce500 e5500 0x80240020 QEMU e500 > NIP:  c000000001370800 LR: c000000001357740 CTR: 0000000000000005 > REGS: c000000080183890 TRAP: 0700   Not tainted > (6.18.0-rc1-01400-ga297f72c4951) > MSR:  0000000080029002   CR: 48000242  XER: 20000000 > IRQMASK: 0 > GPR00: c000000001357740 c000000080183b30 c000000001352000 000000000000000e > GPR04: c0000000011d1c4f 0000000000000002 000000000000001a 0000000000000000 > GPR08: 0000000000000000 0000000000000002 0000000000000001 0000000000000005 > GPR12: c0000000013576a4 c0000000015ad000 c00000000000210c 0000000000000000 > GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 > GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 > GPR24: 0000000000000000 c0000000015876e8 0000000000000002 c000000001587500 > GPR28: c000000001587578 000000000000000e 0000000004000000 0000000000000170 > NIP [c000000001370800] hugetlb_add_hstate+0xc0/0x180 > LR [c000000001357740] hugetlbpage_init+0x9c/0xf0 > Call Trace: > hugetlb_add_hstate+0x148/0x180 (unreliable) > hugetlbpage_init+0x9c/0xf0 > do_one_initcall+0x84/0x308 > kernel_init_freeable+0x2e4/0x380 > kernel_init+0x30/0x15c > ret_from_kernel_user_thread+0x14/0x1c > > Kernel commit causing these warning: > commit 7b4f21f5e0386dfe02c68c009294d8f26e3c1bad (HEAD) > Author: David Hildenbrand > Date:   Mon Sep 1 17:03:29 2025 +0200 > >     mm/hugetlb: check for unreasonable folio sizes when registering hstate > >     Let's check that no hstate that corresponds to an unreasonable > folio size >     is registered by an architecture.  If we were to succeed > registering, we >     could later try allocating an unsupported gigantic folio size. > > ... > >         BUG_ON(order < order_base_2(__NR_USED_SUBPAGE)); > +       WARN_ON(order > MAX_FOLIO_ORDER); >         h = &hstates[hugetlb_max_hstate++]; > > snip... > > > Command to create kernel config: > make ARCH=powerpc corenet64_smp_defconfig > > Qemu command: > qemu-system-ppc64 -nographic -vga none -M ppce500 -smp 2 -m 4G -accel > tcg -kernel ./vmlinux -nic user -initrd ./ppc64-novsx-rootfs.cpio.gz > -cpu e5500 -append "noreboot" > > > Root cause: > The MAX_FOLIO_ORDER  for e500 platform is MAX_PAGE_ORDER which is > nothing but CONFIG_ARCH_FORCE_MAX_ORDER which dependent of page-size > which was 4k. So value of MAX_FOLIO_ODER is 12 for this case. > > As per arch/powerpc/mm/nohash/tlb.c the following page size are supported on > e500 platform: > > struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT] = { >     [MMU_PAGE_4K] = { >         .shift    = 12, >     }, >     [MMU_PAGE_2M] = { >         .shift    = 21, >     }, >     [MMU_PAGE_4M] = { >         .shift    = 22, >     }, >     [MMU_PAGE_16M] = { >         .shift    = 24, >     }, >     [MMU_PAGE_64M] = { >         .shift    = 26, >     }, >     [MMU_PAGE_256M] = { >         .shift    = 28, >     }, >     [MMU_PAGE_1G] = { >         .shift    = 30, >     }, > }; > > With the above MAX_FOLIO_ORDER and page sizes, hugetlbpage_init() in > arch/powerpc/mm/hugetlbpage.c tries to call hugetlb_add_hstate() with > an order higher than 12, causing the kernel to print the above warning. > > Things I tried: > I enabled CONFIG_ARCH_HAS_GIGANTIC_PAGE for the e500 platform. With that, > MAX_FOLIO_ORDER was set to 16, but that was not sufficient for MMU_PAGE_1G. > > This is because with CONFIG_ARCH_HAS_GIGANTIC_PAGE enabled, > MAX_FOLIO_ORDER was set to 16 = PUD_ORDER = (PMD_INDEX_SIZE (7) + > PTE_INDEX_SIZE (9)), > while the order for MMU_PAGE_1G was 18. Yes, we discussed that in [1]. We'll have to set ARCH_HAS_GIGANTIC_PAGE on ppc and increase MAX_FOLIO_ORDER, because apparently, there might be ppc configs that have even larger hugetlb sizes than PUDs. @Cristophe, I was under the impression that you would send a fix. Do you want me to prepare something and send it out? [1] https://lkml.kernel.org/r/4632e721-0ac8-4d72-a8ed-e6c928eee94d@csgroup.eu -- Cheers David / dhildenb