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[174.21.142.130]) by smtp.gmail.com with ESMTPSA id s25-20020a056a00179900b004f737ce5c1asm20402322pfg.73.2022.03.14.10.59.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 14 Mar 2022 10:59:06 -0700 (PDT) Message-ID: <2b7a4974-4507-f335-44a2-383d0188e24c@linaro.org> Date: Mon, 14 Mar 2022 10:59:04 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 Subject: Re: [PATCH 3/3] tests/tcg/s390x: Test BRASL and BRCL with large negative offsets Content-Language: en-US To: Christian Borntraeger , Ilya Leoshkevich , David Hildenbrand , Cornelia Huck , Thomas Huth References: <20220311184911.557245-1-iii@linux.ibm.com> <20220311184911.557245-4-iii@linux.ibm.com> <46cd7fbe-c96e-71b5-a648-da0fce0d2f8d@linaro.org> From: Richard Henderson In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Host-Lookup-Failed: Reverse DNS lookup failed for 2607:f8b0:4864:20::634 (failed) Received-SPF: pass client-ip=2607:f8b0:4864:20::634; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x634.google.com X-Spam_score_int: -6 X-Spam_score: -0.7 X-Spam_bar: / X-Spam_report: (-0.7 / 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=-0.001, PDS_HP_HELO_NORDNS=0.659, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no 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: , Cc: qemu-s390x@nongnu.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 3/14/22 01:30, Christian Borntraeger wrote: > > > Am 11.03.22 um 21:32 schrieb Richard Henderson: >> On 3/11/22 10:49, Ilya Leoshkevich wrote: >>> +    size_t length = 0x100000006; >>> +    unsigned char *buf; >>> +    int i; >>> + >>> +    buf = mmap(NULL, length, PROT_READ | PROT_WRITE | PROT_EXEC, >>> +               MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); >>> +    assert(buf != MAP_FAILED); >> >> I'm thinking exit success here, as such a large allocation may well fail depending on >> the host. > > What about using MAP_NORESERVE ? That can help, certainly. But that doesn't affect RLIMIT_AS, or a 32-bit host. r~