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[81.40.121.39]) by smtp.gmail.com with ESMTPSA id b15sm1469772wrt.57.2021.04.21.21.18.52 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 21 Apr 2021 21:18:53 -0700 (PDT) To: Thomas Huth , "Daniel P . Berrange" , Stefano Garzarella From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Subject: s390-ccw: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=] Message-ID: <4e327c80-8f5d-c848-b524-7f2c75255da4@redhat.com> Date: Thu, 22 Apr 2021 06:18:52 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=philmd@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=216.205.24.124; envelope-from=philmd@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-s390x , Richard Henderson , qemu-devel Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Hi Thomas, Daniel, Stefano, Regarding the following warning (GCC 11 on Fedora 34): In file included from pc-bios/s390-ccw/main.c:11: In function ‘memset’, inlined from ‘boot_setup’ at pc-bios/s390-ccw/main.c:185:5, inlined from ‘main’ at pc-bios/s390-ccw/main.c:288:5: pc-bios/s390-ccw/libc.h:28:14: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=] 28 | p[i] = c; | ~~~~~^~~ Daniel were right on IRC: danpb: it is from a call memset((char *)S390EP, 0, 6) where S390EP is just a constant address 0x10008 danpb: the compiler doesn't now how big that is, so it seems to assume it is zero length This is a known GCC issue: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99578 "gcc-11 -Warray-bounds or -Wstringop-overread warning when accessing a pointer from integer literal" Regards, Phil.