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([2602:47:d483:7301:aef:cddd:11b6:aee3]) by smtp.gmail.com with ESMTPSA id z8-20020a17090a468800b00268b439a0cbsm326851pjf.23.2023.08.08.20.51.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 08 Aug 2023 20:51:29 -0700 (PDT) Message-ID: <7c3f2510-ea9a-927d-adb1-4f74d05f72b5@linaro.org> Date: Tue, 8 Aug 2023 20:51:27 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 Subject: Re: [PATCH] qemu/osdep: Remove fallback for MAP_FIXED_NOREPLACE Content-Language: en-US To: Michael Tokarev , qemu-devel@nongnu.org Cc: Akihiko Odaki References: <20230808164418.69989-1-richard.henderson@linaro.org> From: Richard Henderson In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::102a; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x102a.google.com X-Spam_score_int: -61 X-Spam_score: -6.2 X-Spam_bar: ------ X-Spam_report: (-6.2 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-4.14, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 8/8/23 20:50, Michael Tokarev wrote: > 08.08.2023 19:44, Richard Henderson пишет: >> In order for our emulation of MAP_FIXED_NOREPLACE to succeed within >> linux-user target_mmap, we require a non-zero value.  This does not >> require host kernel support, merely the bit being defined. > > Hm. Should we add something like > >  assert(MAP_FIXED_NOREPLACE != 0) > > somewhere? I wouldn't think so. Where would a zero come from? r~