linux-kernel - include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar

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Message-ID: <202512061811.TwIhRj4D-lkp@intel.com>
Date: Sat, 6 Dec 2025 18:09:51 +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:2100:16: sparse: sparse: cast to non-scalar

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   416f99c3b16f582a3fc6d64a1f77f39d94b76de5
commit: e84a4927a404f369c842c19de93b216627fcc690 net: annotate races around sk->sk_uid
date:   6 months ago
config: arm64-randconfig-r121-20251206 (https://download.01.org/0day-ci/archive/20251206/202512061811.TwIhRj4D-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 14bf95b06a18b9b59c89601cbc0e5a6f2176b118)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251206/202512061811.TwIhRj4D-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/202512061811.TwIhRj4D-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   net/ipv6/af_inet6.c: note: in included file (through include/linux/tcp.h, include/linux/ipv6.h, include/linux/icmpv6.h):
>> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
   include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
--
   net/ipv6/datagram.c: note: in included file (through include/linux/tcp.h, include/linux/ipv6.h):
>> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
   include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
--
   net/ipv6/ping.c: note: in included file (through include/linux/tcp.h, include/linux/ipv6.h, include/net/addrconf.h):
>> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
   include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
--
   net/ipv6/inet6_connection_sock.c: note: in included file (through include/linux/tcp.h, include/linux/ipv6.h):
>> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
   include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
>> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
   include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
--
   net/ipv6/raw.c: note: in included file (through include/linux/tcp.h, include/linux/ipv6.h, include/linux/icmpv6.h):
>> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
   include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
--
   net/ipv6/tcp_ipv6.c: note: in included file (through include/linux/tcp.h, include/linux/ipv6.h):
>> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
   include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
>> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
   include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
   net/ipv6/tcp_ipv6.c:1565:25: sparse: sparse: context imbalance in 'tcp_v6_syn_recv_sock' - unexpected unlock
   net/ipv6/tcp_ipv6.c:1956:21: sparse: sparse: context imbalance in 'tcp_v6_rcv' - different lock contexts for basic block
--
   net/ipv6/udp.c: note: in included file (through include/linux/bpf-cgroup.h):
>> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
   include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
>> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
   include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
--
   net/ipv6/route.c:2382:39: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned int [usertype] flow_label @@     got restricted __be32 @@
   net/ipv6/route.c:2382:39: sparse:     expected unsigned int [usertype] flow_label
   net/ipv6/route.c:2382:39: sparse:     got restricted __be32
   net/ipv6/route.c: note: in included file (through include/linux/mroute_base.h, include/linux/mroute6.h):
>> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
   include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar
>> include/net/sock.h:2100:16: sparse: sparse: cast to non-scalar
   include/net/sock.h:2100:16: sparse: sparse: cast from non-scalar

vim +2100 include/net/sock.h

  2096	
  2097	static inline kuid_t sk_uid(const struct sock *sk)
  2098	{
  2099		/* Paired with WRITE_ONCE() in sockfs_setattr() */
> 2100		return READ_ONCE(sk->sk_uid);
  2101	}
  2102	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki