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To: Bruce Richardson <bruce.richardson@intel.com>, Gavin Hu <Gavin.Hu@arm.com>
Cc: dev@dpdk.org, thomas@monjalon.net, ravi1.kumar@amd.com, g.singh@nxp.com,
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From: Kevin Traynor <ktraynor@redhat.com>
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Date: Thu, 16 Apr 2020 19:43:57 +0100
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Subject: Re: [dpdk-dev] [PATCH] build: gcc 10 disable stringop-overflow
warnings
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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 <rte_config.h>
>>
>> +#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