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[2003:cb:c709:8000:b502:8c1c:3624:99d4]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-37cd57423afsm2356049f8f.90.2024.09.27.05.31.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 27 Sep 2024 05:31:53 -0700 (PDT) Message-ID: <1d734979-0ea1-4943-857c-3d458e33af5a@redhat.com> Date: Fri, 27 Sep 2024 14:31:52 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] dcssblk: Mark DAX broken To: Dan Williams , hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com Cc: Gerald Schaefer , Christian Borntraeger , Sven Schnelle , Jan Kara , Matthew Wilcox , Christoph Hellwig , Alistair Popple , linux-s390@vger.kernel.org, linux-mm@kvack.org References: <172721874675.497781.3277495908107141898.stgit@dwillia2-xfh.jf.intel.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: <172721874675.497781.3277495908107141898.stgit@dwillia2-xfh.jf.intel.com> 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-Stat-Signature: 6y3s7j61jm8ybxe444rbodw69xsrrgbz X-Rspamd-Queue-Id: E855D18000C X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1727440317-952564 X-HE-Meta: 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 8CrblleH 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, 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 25.09.24 00:59, Dan Williams wrote: > The dcssblk driver has long needed special case supoprt to enable > limited dax operation, so called CONFIG_FS_DAX_LIMITED. This mode > works around the incomplete support for ZONE_DEVICE on s390 by forgoing > the ability of dax-mapped pages to support GUP. > > Now, pending cleanups to fsdax that fix its reference counting [1] depend on > the ability of all dax drivers to supply ZONE_DEVICE pages. > > To allow that work to move forward, dax support needs to be paused for > dcssblk until ZONE_DEVICE support arrives. That work has been known for > a few years [2], and the removal of "pte_devmap" requirements [3] makes the > conversion easier. > > For now, place the support behind CONFIG_BROKEN, and remove PFN_SPECIAL > (dcssblk was the only user). > > Link: http://lore.kernel.org/cover.9f0e45d52f5cff58807831b6b867084d0b14b61c.1725941415.git-series.apopple@nvidia.com [1] > Link: http://lore.kernel.org/20210820210318.187742e8@thinkpad/ [2] > Link: http://lore.kernel.org/4511465a4f8429f45e2ac70d2e65dc5e1df1eb47.1725941415.git-series.apopple@nvidia.com [3] > Cc: Gerald Schaefer > Cc: Heiko Carstens > Cc: Vasily Gorbik > Cc: Alexander Gordeev > Cc: Christian Borntraeger > Cc: Sven Schnelle > Cc: Jan Kara > Cc: Matthew Wilcox > Cc: Christoph Hellwig > Cc: Alistair Popple > Signed-off-by: Dan Williams > --- Acked-by: David Hildenbrand -- Cheers, David / dhildenb