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[2003:d8:2f4f:1300:42f1:98e5:ddf8:3a76]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45b575929a0sm106632785e9.25.2025.08.25.05.31.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 25 Aug 2025 05:31:02 -0700 (PDT) Message-ID: <923b279c-de33-44dd-a923-2959afad8626@redhat.com> Date: Mon, 25 Aug 2025 14:31:00 +0200 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: [PATCH v3 08/11] mm/memory: convert print_bad_pte() to print_bad_page_map() To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, xen-devel@lists.xenproject.org, linux-fsdevel@vger.kernel.org, nvdimm@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, Andrew Morton , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko , Dan Williams , Matthew Wilcox , Jan Kara , Alexander Viro , Christian Brauner , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Jann Horn , Pedro Falcato , Hugh Dickins , Oscar Salvador , Lance Yang References: <20250811112631.759341-1-david@redhat.com> <20250811112631.759341-9-david@redhat.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: <20250811112631.759341-9-david@redhat.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: kg828vO1FsCPB_uHGBp6rrD48-V2odKEXDjMjnSswhg_1756125064 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 11.08.25 13:26, David Hildenbrand wrote: > print_bad_pte() looks like something that should actually be a WARN > or similar, but historically it apparently has proven to be useful to > detect corruption of page tables even on production systems -- report > the issue and keep the system running to make it easier to actually detect > what is going wrong (e.g., multiple such messages might shed a light). > > As we want to unify vm_normal_page_*() handling for PTE/PMD/PUD, we'll have > to take care of print_bad_pte() as well. > > Let's prepare for using print_bad_pte() also for non-PTEs by adjusting the > implementation and renaming the function to print_bad_page_map(). > Provide print_bad_pte() as a simple wrapper. > > Document the implicit locking requirements for the page table re-walk. > > To make the function a bit more readable, factor out the ratelimit check > into is_bad_page_map_ratelimited() and place the printing of page > table content into __print_bad_page_map_pgtable(). We'll now dump > information from each level in a single line, and just stop the table > walk once we hit something that is not a present page table. > > The report will now look something like (dumping pgd to pmd values): > > [ 77.943408] BUG: Bad page map in process XXX pte:80000001233f5867 > [ 77.944077] addr:00007fd84bb1c000 vm_flags:08100071 anon_vma: ... > [ 77.945186] pgd:10a89f067 p4d:10a89f067 pud:10e5a2067 pmd:105327067 > > Not using pgdp_get(), because that does not work properly on some arm > configs where pgd_t is an array. Note that we are dumping all levels > even when levels are folded for simplicity. > > Signed-off-by: David Hildenbrand > --- > include/linux/pgtable.h | 19 ++++++++ > mm/memory.c | 104 ++++++++++++++++++++++++++++++++-------- > 2 files changed, 103 insertions(+), 20 deletions(-) > > diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h > index bff5c4241bf2e..33c84b38b7ec6 100644 > --- a/include/linux/pgtable.h > +++ b/include/linux/pgtable.h > @@ -1966,6 +1966,25 @@ enum pgtable_level { > PGTABLE_LEVEL_PGD, > }; > > +static inline const char *pgtable_level_to_str(enum pgtable_level level) > +{ > + switch (level) { > + case PGTABLE_LEVEL_PTE: > + return "pte"; > + case PGTABLE_LEVEL_PMD: > + return "pmd"; > + case PGTABLE_LEVEL_PUD: > + return "pud"; > + case PGTABLE_LEVEL_P4D: > + return "p4d"; > + case PGTABLE_LEVEL_PGD: > + return "pgd"; > + default: > + VM_WARN_ON_ONCE(1); > + return "unknown"; > + } > +} One kernel config doesn't like the VM_WARN_ON_ONCE here, and I don't think we really need it. @Andrew can you squash: From 0b8f6cdfe2c9d96393e7da1772e82048e096a903 Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Mon, 25 Aug 2025 14:25:59 +0200 Subject: [PATCH] fixup: mm/memory: convert print_bad_pte() to print_bad_page_map() Let's just drop the warning, it's highly unlikely that we ever run into this, and if so, there is serious stuff going wrong elsewhere. Signed-off-by: David Hildenbrand --- include/linux/pgtable.h | 1 - 1 file changed, 1 deletion(-) diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index 9f0329d45b1e1..94249e671a7e8 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -1997,7 +1997,6 @@ static inline const char *pgtable_level_to_str(enum pgtable_level level) case PGTABLE_LEVEL_PGD: return "pgd"; default: - VM_WARN_ON_ONCE(1); return "unknown"; } } -- 2.50.1 -- Cheers David / dhildenb