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b=eKJynOg1SL3teW0kvvwJeaHW1wK1bz+B+ChirrsSaw/ZNTJVF1MR9afvhvEOb7I6K gwZt0ZIsLVG9ND2mcQYVCF0XcSdFjTAX5dJHivLSTEBDAvxeEAgCBg78eEZz81qGrL Y3qKCU3MV2cRsGzraivboSUxCkpdQqYcUxDdO5mlgdC4mgtOFVRji6XdzftEYt9Yeh bpfE9Rdv4xjlDxlfAfO9LbOVNFNqVZBLZR4IgaGGiLz182rh9xC62UN+XjDAwqqRw3 7KCKdd7ZJd1uS+ZrABmRT0WI29tDzTZCLrCaDmMwlvpauwlEz89sHk6d5Y2llMmXrc HcWySn1cCuONw== Message-ID: Date: Thu, 25 Jun 2026 12:42:09 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] mm/mm_init: don't overlap NORMAL and MOVABLE zones with kernelcore=mirror To: Mike Rapoport , linux-mm@kvack.org Cc: Andrew Morton , Taku Izumi , Wei Yang , Yuan Liu , linux-kernel@vger.kernel.org References: <20260625073941.145014-1-rppt@kernel.org> <20260625073941.145014-2-rppt@kernel.org> 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: <20260625073941.145014-2-rppt@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 109EF40007 X-Rspam-User: X-Stat-Signature: f4sikujkrbs3weetrstkq44txu69tju7 X-HE-Tag: 1782384133-279633 X-HE-Meta: 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 vIZxzWgF WTGthnGayhhtEfeAhna2V+0qUtyucqRXbHGo/QMQ2vDzCFypkGHLIilmQ/ZV9inxAOBgPMihCRAnaHZkNOcMXEmxsdBUtfAmcR7/kWYQkZtB0bcIFPQfDdOqwBmgeqQ9N7oLySRxJpSIfbKVK6cyFhSoE4J0K2xDOuXktO9lNI70xJnO9meJNqbkCQgBt0JrRyoyGeo7A+GrT8qgLQm1ZbQVyMZqyB/SIK6kmsmUxVio7zDus0USMSiFfage5muViZgHcRu9Eib2ceyrgXgDqMPtoPKydlgfxcr2OFEzEYGswzvpQwajZlhhugimm0rErS+oy6uIuXFDv+nVpy5TELx0xTbw6kaocLR+yjx8B6TZ2YSJFa04iQaAWt0BhDEmYE4ylT5srWj1UP08ayIJSzdgtvQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 6/25/26 09:39, Mike Rapoport wrote: > From: "Mike Rapoport (Microsoft)" > > When kernelcore or movablecore kernel parameters define size of the > NORMAL and MOVABLE zones as percents of the total memory or by absolute > value, ZONE_NORMAL is clamped at the beginning of ZONE_MOVABLE. > > However, when kernelcore=mirror the ZONE_NORMAL span is not changed but > rather pages from ZONE_MOVABLE counted as absent in ZONE_NORMAL. > > Make the behaviour of kernelcore= parameter uniform and treat mirror > just as another way to size the zones. That sounds just about right to me. Hard to imagine that any code would have relied on the old behavior. Reviewed-by: David Hildenbrand (Arm) -- Cheers, David