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b=V+rWmYyqOSRcqABxv0QWdLshlJpYgu7fEwgb64B0fTA/c6pgG8MG/w+ZcKT0/BuWP PXHroR3YWS3vqI4BXdgO/PxHbkyiiDZx4CmTzeiMilwaV9zEePGKlT7F+TKuzNdFq6 v2AJAZCJG5oFbUGQE7dJAZb6p4yLwKqLyUPcFhQnI/04TmuuPHAC8Dlx12mvsL1UE+ 2la+iQcxibbkBOTCIH3s+84DEkiaAmThXEppa4VEG3WIhzOKk8/fe/f2f7DQvpp676 uLIpdNki57hG3MPr5ty1Pt4afb+h9Ntc6yYqShkM0PHnlXPALS6pVO+pdo3KeYSU62 7t2ssBVeagtzQ== Message-ID: <729e14d4-6949-4d46-9380-12331b5ad363@kernel.org> Date: Fri, 6 Mar 2026 14:25:51 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 1/4] mm: move vma_kernel_pagesize() from hugetlb to mm.h To: "Lorenzo Stoakes (Oracle)" Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, Dan Williams References: <20260306101600.57355-1-david@kernel.org> <20260306101600.57355-2-david@kernel.org> <833950ef-e01d-4914-b5f9-bc1f6261b184@lucifer.local> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+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: <833950ef-e01d-4914-b5f9-bc1f6261b184@lucifer.local> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 1EAB1140019 X-Stat-Signature: u8rxed4qhhy5xxdjkfn718xjf4mdommh X-Rspam-User: X-HE-Tag: 1772803558-624120 X-HE-Meta: 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 gb6sbBQ+ i0F3KiL1OfyDj/mo5x1AFnZ5INxa9KQ6YgW36L203vsorIZ0g5ey8uRVj/x1FUnuBVGzzM5/EUshTaXwNY2AWQhT32dMUDh+kC4xz4H+ytZLl/jcwtA/rc+ijPIc71/OOjRxSjNOHOQC/lYYFcuHiz4F0h607qkgQ931ikHuMOLAVLMQxk4ghPUPPMHjjhm154TgLZ1yJjO9QxCB5x33sbHUFlcoXL7mxJWumqQOrq84BKVyOrzluHphCTSx6/U+Rc/7MBFmf2l72ExC6rWeRXuZJleiOelYbtL8aNaaV8OhbW8vr/ydHtJ4iDIBQKU0mVyM5fE+0X+mAi7wdxhgzQNTwV9F4UJWNmZ2R Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/6/26 12:07, Lorenzo Stoakes (Oracle) wrote: > On Fri, Mar 06, 2026 at 11:15:57AM +0100, David Hildenbrand (Arm) wrote: >> In the past, only hugetlb had special "vma_kernel_pagesize()" >> requirements, so it provided its own implementation. >> >> In commit 05ea88608d4e ("mm, hugetlbfs: introduce ->pagesize() to >> vm_operations_struct") we generalized that approach by providing a >> vm_ops->pagesize() callback to be used by device-dax. >> >> Once device-dax started using that callback in commit c1d53b92b95c >> ("device-dax: implement ->pagesize() for smaps to report MMUPageSize") >> it was missed that CONFIG_DEV_DAX does not depend on hugetlb support. >> >> So building a kernel with CONFIG_DEV_DAX but without CONFIG_HUGETLBFS >> would not pick up that value. >> >> Fix it by moving vma_kernel_pagesize() to mm.h, providing only a single >> implementation. While at it, improve the kerneldoc a bit. >> >> Ideally, we'd move vma_mmu_pagesize() as well to the header. However, >> its __weak symbol might be overwritten by a PPC variant in hugetlb code. >> So let's leave it in there for now, as it really only matters for some >> hugetlb oddities. >> >> This was found by code inspection. >> >> Fixes: c1d53b92b95c ("device-dax: implement ->pagesize() for smaps to report MMUPageSize") >> Cc: Dan Williams >> Signed-off-by: David Hildenbrand (Arm) > > LGTM, but you need to fix up VMA tests, I attach a patch below to do this. Will > this resolved: Thanks! I assume that should go into patch #2 instead? > > Reviewed-by: Lorenzo Stoakes (Oracle) [...] > --- > tools/testing/vma/include/dup.h | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/tools/testing/vma/include/dup.h b/tools/testing/vma/include/dup.h > index 3078ff1487d3..65b1030a7fdf 100644 > --- a/tools/testing/vma/include/dup.h > +++ b/tools/testing/vma/include/dup.h > @@ -1318,3 +1318,10 @@ static inline void vma_set_file(struct vm_area_struct *vma, struct file *file) > swap(vma->vm_file, file); > fput(file); > } > + > +static inline unsigned long vma_kernel_pagesize(struct vm_area_struct *vma) > +{ > + if (unlikely(vma->vm_ops && vma->vm_ops->pagesize)) > + return vma->vm_ops->pagesize(vma); > + return PAGE_SIZE; Should we just KIS and use PAGE_SIZE for the test? -- Cheers, David