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[2003:cb:c719:8200:487a:3426:a17e:d7b7]) by smtp.gmail.com with ESMTPSA id x5-20020a5d6b45000000b003472489d26fsm19461439wrw.19.2024.04.25.02.51.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 25 Apr 2024 02:51:34 -0700 (PDT) Message-ID: Date: Thu, 25 Apr 2024 11:51:33 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: kmalloc() question - migration/remap of kmalloc()'ed pages To: Mounesh Badiger Cc: linux-mm@kvack.org References: <20493de7-9367-4453-84c4-23d2db1b5986@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 ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 5ED9E10000D X-Stat-Signature: jbq85z7hqx79htcrefdsq5b3nmiux596 X-Rspam-User: X-HE-Tag: 1714038698-841751 X-HE-Meta: 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 ZxTBGsgL gwhwbR3tFNaSPN9vM2KuL6lyLycgX5qonRXOb/5Pm76Lwkas6xAejq9tvkWr96r8rz+6gJxMZk6vIdM3hvGG4dsKt7b8yGOsOk2B1HHm3i3nWuBOJtk0i7AIHQWxZvGKj0VCS2mZO+mkvGvmvOj30Hw0bEQFqi1fxTkRyT9ioUcMaP5cs3JQf/S5Ep4mfkwYpfPZA8hJ7RMK9+tCyq5NCOUYdV3+lUQ7A1P+K0RbXN5O2z9cP168iWmRRJoC/lRENqVelkDeasrDjJxrADFN+DAGehqi5ILPr7B//X6b8mhbvpWcDqB37qJb6BUlQLiXvSoWCDgLcdGXbNCxwk0MvzQ1kV8v4DHIC06+oEGZAsrT81TuxJp79xtAGbns51UWq0XdxqzSLJkokdOwjDD+HkiCZ92fAOIG6RK6/6pgckRRR6vX5iIbueDDIZqR3rL7CoDfX X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, 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 25.04.24 11:48, Mounesh Badiger wrote: > Thanks for the confirmation. > I am using remap_pfn_range(). I can use alloc_pages() instead of kmalloc(). > Okay, for remap_pfn_range() it doesn't matter, because we'll never touch the "struct page" metadata (pages are considered not refcounted). vm_insert_page() would likely have refused the kmalloc'ed pages because validate_page_before_insert() would refuse mapping any slab folios. Should be working for you as expected. -- Cheers, David / dhildenb