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Message-ID: <8607787b42e80503e0259f41e0bcc2d3ff770355.camel@redhat.com>
Subject: Re: [PATCH] net: hns3: tracing: fix hclgevf trace event strings
From: Paolo Abeni <pabeni@redhat.com>
To: Steven Rostedt <rostedt@goodmis.org>, LKML
 <linux-kernel@vger.kernel.org>,  Linux Trace Kernel
 <linux-trace-kernel@vger.kernel.org>, netdev <netdev@vger.kernel.org>
Cc: Yisen Zhuang <yisen.zhuang@huawei.com>, Salil Mehta
 <salil.mehta@huawei.com>,  Jijie Shao <shaojijie@huawei.com>, "David S.
 Miller" <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>, Jakub
 Kicinski <kuba@kernel.org>, Yufeng Mo <moyufeng@huawei.com>, Huazhong Tan
 <tanhuazhong@huawei.com>
Date: Thu, 14 Mar 2024 15:39:28 +0100
In-Reply-To: <20240313093454.3909afe7@gandalf.local.home>
References: <20240313093454.3909afe7@gandalf.local.home>
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On Wed, 2024-03-13 at 09:34 -0400, Steven Rostedt wrote:
> From: "Steven Rostedt (Google)" <rostedt@goodmis.org>
>=20
> [
>    Note, I need to take this patch through my tree, so I'm looking for ac=
ks.

Note that this device driver is changing quite rapidly, so I expect
some conflicts here later. I guess Liuns will have to handle them ;)

>    This causes the build to fail when I add the __assign_str() check, whi=
ch
>    I was about to push to Linus, but it breaks allmodconfig due to this e=
rror.
> ]
>=20
> The __string() and __assign_str() helper macros of the TRACE_EVENT() macr=
o
> are going through some optimizations where only the source string of
> __string() will be used and the __assign_str() source will be ignored and
> later removed.
>=20
> To make sure that there's no issues, a new check is added between the
> __string() src argument and the __assign_str() src argument that does a
> strcmp() to make sure they are the same string.
>=20
> The hclgevf trace events have:
>=20
>   __assign_str(devname, &hdev->nic.kinfo.netdev->name);
>=20
> Which triggers the warning:
>=20
> hclgevf_trace.h:34:39: error: passing argument 1 of =E2=80=98strcmp=E2=80=
=99 from incompatible pointer type [-Werror=3Dincompatible-pointer-types]
>    34 |                 __assign_str(devname, &hdev->nic.kinfo.netdev->na=
me);
>  [..]
> arch/x86/include/asm/string_64.h:75:24: note: expected =E2=80=98const cha=
r *=E2=80=99 but argument is of type =E2=80=98char (*)[16]=E2=80=99
>    75 | int strcmp(const char *cs, const char *ct);
>       |            ~~~~~~~~~~~~^~
>=20
>=20
> Because __assign_str() now has:
>=20
> 	WARN_ON_ONCE(__builtin_constant_p(src) ?		\
> 		     strcmp((src), __data_offsets.dst##_ptr_) :	\
> 		     (src) !=3D __data_offsets.dst##_ptr_);	\
>=20
> The problem is the '&' on hdev->nic.kinfo.netdev->name. That's because
> that name is:
>=20
> 	char			name[IFNAMSIZ]
>=20
> Where passing an address '&' of a char array is not compatible with strcm=
p().
>=20
> The '&' is not necessary, remove it.
>=20
> Fixes: d8355240cf8fb ("net: hns3: add trace event support for PF/VF mailb=
ox")

checkpactch in strict mode complains the hash is not 12 char long.

> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

FWIW

Acked-by: Paolo Abeni <pabeni@redhat.com>