linux-kernel - Re: include/net/sock.h:2098:16: sparse: sparse: cast to non-scalar

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Message-ID: <CANn89iLrM8ZJyJHYJH8Sbuj9F9OAKZn6srtgBXwU2XmMfJ-+BQ@mail.gmail.com>
Date: Mon, 3 Nov 2025 00:06:18 -0800
From: Eric Dumazet <edumazet@...gle.com>
To: kernel test robot <lkp@...el.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	Jakub Kicinski <kuba@...nel.org>, Maciej Żenczykowski <maze@...gle.com>, 
	Will Deacon <will@...nel.org>, "Paul E. McKenney" <paulmck@...nel.org>, linux-alpha@...r.kernel.org
Subject: Re: include/net/sock.h:2098:16: sparse: sparse: cast to non-scalar

On Mon, Sep 29, 2025 at 2:49 AM Eric Dumazet <edumazet@...gle.com> wrote:
>
> On Mon, Sep 29, 2025 at 1:58 AM kernel test robot <lkp@...el.com> wrote:
> >
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   e5f0a698b34ed76002dc5cff3804a61c80233a7a
> > commit: c51da3f7a161c6822232be832abdffe47eb55b4c net: remove sock_i_uid()
> > date:   3 months ago
> > config: alpha-randconfig-r122-20250929 (https://download.01.org/0day-ci/archive/20250929/202509291645.fcBIaXMb-lkp@intel.com/config)
> > compiler: alpha-linux-gcc (GCC) 15.1.0
> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250929/202509291645.fcBIaXMb-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/202509291645.fcBIaXMb-lkp@intel.com/
> >
> > sparse warnings: (new ones prefixed by >>)
> >    net/packet/diag.c: note: in included file (through include/linux/sock_diag.h):
> > >> include/net/sock.h:2098:16: sparse: sparse: cast to non-scalar
> >    include/net/sock.h:2098:16: sparse: sparse: cast from non-scalar
> > --
> >    net/packet/af_packet.c:1099:13: sparse: sparse: context imbalance in '__packet_lookup_frame_in_block' - different lock contexts for basic block
> >    net/packet/af_packet.c:2541:17: sparse: sparse: context imbalance in 'tpacket_rcv' - unexpected unlock
> >    net/packet/af_packet.c: note: in included file (through include/net/inet_sock.h, include/net/ip.h):
> > >> include/net/sock.h:2098:16: sparse: sparse: cast to non-scalar
> >    include/net/sock.h:2098:16: sparse: sparse: cast from non-scalar
> >
> > vim +2098 include/net/sock.h
> >
> > ^1da177e4c3f415 Linus Torvalds 2005-04-16  2094
> > e84a4927a404f36 Eric Dumazet   2025-06-20  2095  static inline kuid_t sk_uid(const struct sock *sk)
> > e84a4927a404f36 Eric Dumazet   2025-06-20  2096  {
> > e84a4927a404f36 Eric Dumazet   2025-06-20  2097         /* Paired with WRITE_ONCE() in sockfs_setattr() */
> > e84a4927a404f36 Eric Dumazet   2025-06-20 @2098         return READ_ONCE(sk->sk_uid);
> > e84a4927a404f36 Eric Dumazet   2025-06-20  2099  }
> > e84a4927a404f36 Eric Dumazet   2025-06-20  2100
> >
> > :::::: The code at line 2098 was first introduced by commit
> > :::::: e84a4927a404f369c842c19de93b216627fcc690 net: annotate races around sk->sk_uid
> >
> > :::::: TO: Eric Dumazet <edumazet@...gle.com>
> > :::::: CC: Jakub Kicinski <kuba@...nel.org>
> >
> > --
> > 0-DAY CI Kernel Test Service
> > https://github.com/intel/lkp-tests/wiki
>
> This seems an Alpha issue to me ?
>
> I can submit the following fix if there is an agreement.
>
> diff --git a/arch/alpha/include/asm/rwonce.h b/arch/alpha/include/asm/rwonce.h
> index 35542bcf92b3a883df353784bcb2d243475ccd91..b6801cd2ace962e11624737ed334a5aeb30478b7
> 100644
> --- a/arch/alpha/include/asm/rwonce.h
> +++ b/arch/alpha/include/asm/rwonce.h
> @@ -22,10 +22,10 @@
>   */
>  #define __READ_ONCE(x)                                                 \
>  ({                                                                     \
> -       __unqual_scalar_typeof(x) __x =                                 \
> -               (*(volatile typeof(__x) *)(&(x)));                      \
> +       __auto_type __x =                                               \
> +               (*(const volatile __unqual_scalar_typeof(x) *)&(x));    \
>         mb();                                                           \
> -       (typeof(x))__x;                                                 \
> +       __x;                                                            \
>  })
>
>  #endif /* CONFIG_SMP */

Gentle ping.

Is alpha arch still alive ?