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Thu, 16 Apr 2020 14:44:11 -0400 X-MC-Unique: tHzmr9EIPryLYujPvCukdw-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 4D37F149C0; Thu, 16 Apr 2020 18:44:08 +0000 (UTC) Received: from [10.33.36.194] (unknown [10.33.36.194]) by smtp.corp.redhat.com (Postfix) with ESMTP id 375085C541; Thu, 16 Apr 2020 18:43:59 +0000 (UTC) To: Bruce Richardson , Gavin Hu Cc: dev@dpdk.org, thomas@monjalon.net, ravi1.kumar@amd.com, g.singh@nxp.com, hemant.agrawal@nxp.com, akhil.goyal@nxp.com, johndale@cisco.com, hyonkim@cisco.com, jingjing.wu@intel.com, wenzhuo.lu@intel.com, rmody@marvell.com, shshaikh@marvell.com, matan@mellanox.com, shahafs@mellanox.com, declan.doherty@intel.com, cristian.dumitrescu@intel.com References: <20200325141137.7088-1-ktraynor@redhat.com> <20200407162755.6802-1-ktraynor@redhat.com> <1fc82ce4-8cae-fae5-6139-9590ae1f00ef@redhat.com> <20200410132310.GA42@bricha3-MOBL.ger.corp.intel.com> From: Kevin Traynor Autocrypt: addr=ktraynor@redhat.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200410132310.GA42@bricha3-MOBL.ger.corp.intel.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Subject: Re: [dpdk-dev] [PATCH] build: gcc 10 disable stringop-overflow warnings X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 10/04/2020 14:23, Bruce Richardson wrote: > On Fri, Apr 10, 2020 at 11:51:56AM +0100, Kevin Traynor wrote: >> On 07/04/2020 17:27, Kevin Traynor wrote: >>> stringop-overflow warns when it sees a possible overflow >>> in a string operation. >>> >>> In the rte_memcpy functions different implementations are >>> used depending on the size. stringop-overflow is raised for >>> the paths in the function where it sees the static size of the >>> src could be overflowed. >>> >>> However, in reality a correct size argument and in some cases >>> dynamic allocation would ensure that this does not happen. >>> >>> Disable this warning at the top level as it is being raised on >>> several components. >>> >>> For example, in the case below for key, the correct path will be >>> chosen in rte_memcpy_generic at runtime based on the size argument >>> but as some paths in the function could lead to a cast to 32 bytes >>> a warning is raised. >>> >>> In function =E2=80=98_mm256_storeu_si256=E2=80=99, >>> inlined from =E2=80=98rte_memcpy_generic=E2=80=99 >>> at ../lib/librte_eal/common/include/arch/x86/rte_memcpy.h:315:2, >>> inlined from =E2=80=98iavf_configure_rss_key=E2=80=99 >>> at ../lib/librte_eal/common/include/arch/x86/rte_memcpy.h:869:10: >>> >>> /usr/lib/gcc/x86_64-redhat-linux/10/include/avxintrin.h:928:8: >>> warning: writing 32 bytes into a region of size 1 [-Wstringop-overflow= =3D] >>> 928 | *__P =3D __A; >>> | ~~~~~^~~~~ >>> In file included >>> from ../drivers/net/iavf/../../common/iavf/iavf_prototype.h:10, >>> from ../drivers/net/iavf/iavf.h:9, >>> from ../drivers/net/iavf/iavf_vchnl.c:22: >>> >>> ../drivers/net/iavf/iavf_vchnl.c: >>> In function =E2=80=98iavf_configure_rss_key=E2=80=99: >>> >>> ../drivers/net/iavf/../../common/iavf/virtchnl.h:508:5: >>> note: at offset 0 to object =E2=80=98key=E2=80=99 with size 1 declared = here >>> 508 | u8 key[1]; /* RSS hash key, packed bytes */ >>> | ^~~ >>> >> >> As an alternative, we could remove these warnings for rte_memcpy.h(s) >> only. WDYT? >> >> diff --git a/lib/librte_eal/x86/include/rte_memcpy.h >> b/lib/librte_eal/x86/include/rte_memcpy.h >> index ba44c4a32..862e0c402 100644 >> --- a/lib/librte_eal/x86/include/rte_memcpy.h >> +++ b/lib/librte_eal/x86/include/rte_memcpy.h >> @@ -19,4 +19,6 @@ >> #include >> >> +#pragma GCC diagnostic ignored "-Wstringop-overflow" >> + >> #ifdef __cplusplus >> extern "C" { >=20 > Limited disabling is always better than global disabling, so given the > choice of the two, +1 for this. >=20 Thanks Bruce. The slight disadvantage of this approach in short term is a similar issue may also occur for gcc10 on ARM, but I don't have a setup to test that, so an additional arm/eal fix may be required later. I will limit fixing to what I can test, x86. Gavin, can you check if a similar change is required for gcc10 on ARM? > /Bruce >=20