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Fri, 21 Feb 2025 11:27:45 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id mALuCzFjuGeOTAAAD6G6ig (envelope-from ); Fri, 21 Feb 2025 11:27:45 +0000 Message-ID: <46163fb7-2bc2-456d-9e1a-02657293037a@suse.cz> Date: Fri, 21 Feb 2025 12:27:44 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v10 07/18] mm: allow vma_start_read_locked/vma_start_read_locked_nested to fail Content-Language: en-US To: Suren Baghdasaryan , akpm@linux-foundation.org Cc: peterz@infradead.org, willy@infradead.org, liam.howlett@oracle.com, lorenzo.stoakes@oracle.com, david.laight.linux@gmail.com, mhocko@suse.com, hannes@cmpxchg.org, mjguzik@gmail.com, oliver.sang@intel.com, mgorman@techsingularity.net, david@redhat.com, peterx@redhat.com, oleg@redhat.com, dave@stgolabs.net, paulmck@kernel.org, brauner@kernel.org, dhowells@redhat.com, hdanton@sina.com, hughd@google.com, lokeshgidra@google.com, minchan@google.com, jannh@google.com, shakeel.butt@linux.dev, souravpanda@google.com, pasha.tatashin@soleen.com, klarasmodin@gmail.com, richard.weiyang@gmail.com, corbet@lwn.net, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@android.com References: <20250213224655.1680278-1-surenb@google.com> <20250213224655.1680278-8-surenb@google.com> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Stat-Signature: 5nissoz31hg8ajpdz9qqjn66kkw8n9ra X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: EBEDC10000B X-HE-Tag: 1740137266-705942 X-HE-Meta: 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 vLPlndsx YXQlAlI720DYnDo8Dhcg8SzVvfe0xGL9ZgD8EPfF8FeQ/MqcLbot35EcQHtul5uYVnZnulbMkUEerjdzO2eOEFqzoRKwaLw8mVOi5wT10I+MFlPZz2Unh9nHX/et/VCUYpStHAsAliwJp25YJx7pUIUoCOaEb/6LQkIYIxFnze9oaD5ysVLYMc7xvkCm9RXAMm7jBZX8Ko4qs1u4C5ah719ML+zV8zR9gQm26FBhZbFOvPI0xRg20gV+0Ah4Ge3RokXTnbdjzn5s72US1kP8RWP3sXNCQXDaSdUi5DyKQ8yPCicwxKNfAl7yTY8w0q2zGviPCaP7JTpLcIbDRDhnsyxxkq52w/GQCwzg3SDort9Co36YxHVYHNq5h139zy96daHDjeppIiPs9dQsjVHBn8zhUQqk6WUWdJI3uXL5NpblZKJU= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000117, 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 2/13/25 23:46, Suren Baghdasaryan wrote: > With upcoming replacement of vm_lock with vm_refcnt, we need to handle a > possibility of vma_start_read_locked/vma_start_read_locked_nested failing > due to refcount overflow. Prepare for such possibility by changing these > APIs and adjusting their users. > > Signed-off-by: Suren Baghdasaryan > Cc: Lokesh Gidra Reviewed-by: Vlastimil Babka