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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200407162755.6802-1-ktraynor@redhat.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 07/04/2020 17:27, Kevin Traynor wrote: > stringop-overflow warns when it sees a possible overflow > in a string operation. >=20 > 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. >=20 > However, in reality a correct size argument and in some cases > dynamic allocation would ensure that this does not happen. >=20 > Disable this warning at the top level as it is being raised on > several components. >=20 > 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. >=20 > 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: >=20 > /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: >=20 > ../drivers/net/iavf/iavf_vchnl.c: > In function =E2=80=98iavf_configure_rss_key=E2=80=99: >=20 > ../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 he= re > 508 | u8 key[1]; /* RSS hash key, packed bytes */ > | ^~~ >=20 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" { > Bugzilla ID: 394 > Bugzilla ID: 421 >=20 > Signed-off-by: Kevin Traynor > ---> config/meson.build | 3 ++- > mk/toolchain/gcc/rte.vars.mk | 3 +++ > 2 files changed, 5 insertions(+), 1 deletion(-) >=20 > diff --git a/config/meson.build b/config/meson.build > index 58421342b..476a667a9 100644 > --- a/config/meson.build > +++ b/config/meson.build > @@ -200,5 +200,6 @@ warning_flags =3D [ > =09'-Wno-address-of-packed-member', > =09'-Wno-packed-not-aligned', > -=09'-Wno-missing-field-initializers' > +=09'-Wno-missing-field-initializers', > +=09'-Wno-stringop-overflow' > ] > if not dpdk_conf.get('RTE_ARCH_64') > diff --git a/mk/toolchain/gcc/rte.vars.mk b/mk/toolchain/gcc/rte.vars.mk > index f19305e49..fe4b8c705 100644 > --- a/mk/toolchain/gcc/rte.vars.mk > +++ b/mk/toolchain/gcc/rte.vars.mk > @@ -101,4 +101,7 @@ endif > WERROR_FLAGS +=3D -Wno-address-of-packed-member > =20 > +# disable stringop-overflow warnings > +WERROR_FLAGS +=3D -Wno-stringop-overflow > + > export CC AS AR LD OBJCOPY OBJDUMP STRIP READELF > export TOOLCHAIN_CFLAGS TOOLCHAIN_LDFLAGS TOOLCHAIN_ASFLAGS >=20