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

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Message-ID: <202509291645.fcBIaXMb-lkp@intel.com>
Date: Mon, 29 Sep 2025 16:57:35 +0800
From: kernel test robot <lkp@...el.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Jakub Kicinski <kuba@...nel.org>,
	Maciej Żenczykowski <maze@...gle.com>
Subject: include/net/sock.h:2098:16: sparse: sparse: cast to non-scalar

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