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Message-ID: <20250627084609-mutt-send-email-mst@kernel.org>
Date: Fri, 27 Jun 2025 08:47:30 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Paolo Abeni <pabeni@...hat.com>
Cc: kernel test robot <lkp@...el.com>, netdev@...r.kernel.org,
oe-kbuild-all@...ts.linux.dev,
Willem de Bruijn <willemdebruijn.kernel@...il.com>,
Jason Wang <jasowang@...hat.com>,
Andrew Lunn <andrew+netdev@...n.ch>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
Eugenio Pérez <eperezma@...hat.com>,
Yuri Benditovich <yuri.benditovich@...nix.com>,
Akihiko Odaki <akihiko.odaki@...nix.com>,
Jonathan Corbet <corbet@....net>, kvm@...r.kernel.org,
linux-doc@...r.kernel.org
Subject: Re: [PATCH v6 net-next 4/9] vhost-net: allow configuring extended
features
On Fri, Jun 27, 2025 at 02:44:42PM +0200, Paolo Abeni wrote:
> On 6/27/25 2:18 PM, Michael S. Tsirkin wrote:
> > On Fri, Jun 27, 2025 at 12:28:00PM +0200, Paolo Abeni wrote:
> >> On 6/27/25 8:41 AM, kernel test robot wrote:
> >>> kernel test robot noticed the following build warnings:
> >>>
> >>> [auto build test WARNING on net-next/main]
> >>>
> >>> url: https://github.com/intel-lab-lkp/linux/commits/Paolo-Abeni/scripts-kernel_doc-py-properly-handle-VIRTIO_DECLARE_FEATURES/20250624-221751
> >>> base: net-next/main
> >>> patch link: https://lore.kernel.org/r/23e46bff5333015d92bf0876033750d9fbf555a0.1750753211.git.pabeni%40redhat.com
> >>> patch subject: [PATCH v6 net-next 4/9] vhost-net: allow configuring extended features
> >>> config: csky-randconfig-001-20250627 (https://download.01.org/0day-ci/archive/20250627/202506271443.G9cAx8PS-lkp@intel.com/config)
> >>> compiler: csky-linux-gcc (GCC) 15.1.0
> >>> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250627/202506271443.G9cAx8PS-lkp@intel.com/reproduce)
> >>>
> >>> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> >>> the same patch/commit), kindly add following tags
> >>> | Reported-by: kernel test robot <lkp@...el.com>
> >>> | Closes: https://lore.kernel.org/oe-kbuild-all/202506271443.G9cAx8PS-lkp@intel.com/
> >>>
> >>> All warnings (new ones prefixed by >>):
> >>>
> >>> In file included from include/linux/uaccess.h:12,
> >>> from include/linux/sched/task.h:13,
> >>> from include/linux/sched/signal.h:9,
> >>> from include/linux/rcuwait.h:6,
> >>> from include/linux/percpu-rwsem.h:7,
> >>> from include/linux/fs.h:34,
> >>> from include/linux/compat.h:17,
> >>> from drivers/vhost/net.c:8:
> >>> arch/csky/include/asm/uaccess.h: In function '__get_user_fn.constprop':
> >>>>> arch/csky/include/asm/uaccess.h:147:9: warning: 'retval' is used uninitialized [-Wuninitialized]
> >>> 147 | __asm__ __volatile__( \
> >>> | ^~~~~~~
> >>> arch/csky/include/asm/uaccess.h:187:17: note: in expansion of macro '__get_user_asm_64'
> >>> 187 | __get_user_asm_64(x, ptr, retval);
> >>> | ^~~~~~~~~~~~~~~~~
> >>> arch/csky/include/asm/uaccess.h:170:13: note: 'retval' was declared here
> >>> 170 | int retval;
> >>> | ^~~~~~
> >>>
> >>>
> >>> vim +/retval +147 arch/csky/include/asm/uaccess.h
> >>>
> >>> da551281947cb2c Guo Ren 2018-09-05 141
> >>> e58a41c2226847f Guo Ren 2021-04-21 142 #define __get_user_asm_64(x, ptr, err) \
> >>> da551281947cb2c Guo Ren 2018-09-05 143 do { \
> >>> da551281947cb2c Guo Ren 2018-09-05 144 int tmp; \
> >>> e58a41c2226847f Guo Ren 2021-04-21 145 int errcode; \
> >>> e58a41c2226847f Guo Ren 2021-04-21 146 \
> >>> e58a41c2226847f Guo Ren 2021-04-21 @147 __asm__ __volatile__( \
> >>> e58a41c2226847f Guo Ren 2021-04-21 148 "1: ldw %3, (%2, 0) \n" \
> >>> da551281947cb2c Guo Ren 2018-09-05 149 " stw %3, (%1, 0) \n" \
> >>> e58a41c2226847f Guo Ren 2021-04-21 150 "2: ldw %3, (%2, 4) \n" \
> >>> e58a41c2226847f Guo Ren 2021-04-21 151 " stw %3, (%1, 4) \n" \
> >>> e58a41c2226847f Guo Ren 2021-04-21 152 " br 4f \n" \
> >>> e58a41c2226847f Guo Ren 2021-04-21 153 "3: mov %0, %4 \n" \
> >>> e58a41c2226847f Guo Ren 2021-04-21 154 " br 4f \n" \
> >>> da551281947cb2c Guo Ren 2018-09-05 155 ".section __ex_table, \"a\" \n" \
> >>> da551281947cb2c Guo Ren 2018-09-05 156 ".align 2 \n" \
> >>> e58a41c2226847f Guo Ren 2021-04-21 157 ".long 1b, 3b \n" \
> >>> e58a41c2226847f Guo Ren 2021-04-21 158 ".long 2b, 3b \n" \
> >>> da551281947cb2c Guo Ren 2018-09-05 159 ".previous \n" \
> >>> e58a41c2226847f Guo Ren 2021-04-21 160 "4: \n" \
> >>> e58a41c2226847f Guo Ren 2021-04-21 161 : "=r"(err), "=r"(x), "=r"(ptr), \
> >>> e58a41c2226847f Guo Ren 2021-04-21 162 "=r"(tmp), "=r"(errcode) \
> >>> e58a41c2226847f Guo Ren 2021-04-21 163 : "0"(err), "1"(x), "2"(ptr), "3"(0), \
> >>> e58a41c2226847f Guo Ren 2021-04-21 164 "4"(-EFAULT) \
> >>> da551281947cb2c Guo Ren 2018-09-05 165 : "memory"); \
> >>> da551281947cb2c Guo Ren 2018-09-05 166 } while (0)
> >>> da551281947cb2c Guo Ren 2018-09-05 167
> >>
> >> AFAICS the issue reported here is in the arch-specific uaccess helpers
> >> and not related to this series.
> >>
> >> /P
> >
> > I think it's due to code like this in your patch:
> >
> > + if (get_user(features, featurep + 1 + i))
> > + return -EFAULT;
> >
> > the specific arch might have a bug that this is unconvering,
> > or a limitation, I can't say.
> >
> > Seems worth fixing, though.
> >
> > Poke the mainatiners?
>
> FTR, I tried the boot reproducer locally, and does not trigger here.
>
> The above statement is AFAICS legit, and the issue, if any, is present
> into such arch. I would not say this patch is 'uncovering' anything, as
> the relevant pattern is very common.
>
> Possibly the test robot added support for csky only recently?
>
> I will ping the arch maintainers, but I suggest/argue not blocking this
> series for this thing.
>
> Thanks,
>
> Paolo
OK.
Still sick sadly, so I took more time off through end of month. If
this can wait with thorough review until then, maybe the arch
maintainers will respond.
--
MST
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