Subject: Re: [PATCH net-next v2 09/12] net-timestamp: add tx OPT_ID_TCP support for bpf case

From: kernel test robot <[email-masked]>
Date: Tue, 15 Oct 2024 16:40:39 +0800

Hi Jason,

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/Jason-Xing/net-timestamp-introduce-socket-tsflag-requestors/20241012-121010
base:   net-next/main
patch link:    https://lore.kernel.org/r/20241012040651.95616-10-kerneljasonxing%40gmail.com
patch subject: [PATCH net-next v2 09/12] net-timestamp: add tx OPT_ID_TCP support for bpf case
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20241015/[email-masked]/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241015/[email-masked]/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 <[email-masked]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email-masked]/

All warnings (new ones prefixed by >>):

>> net/core/sock.c:926:2: warning: variable 'tsflags' is uninitialized when used here [-Wuninitialized]
     926 |         tsflags |= (sk->sk_tsflags[SOCKETOPT_TS_REQUESTOR] |
         |         ^~~~~~~
   net/core/sock.c:920:13: note: initialize the variable 'tsflags' to silence this warning
     920 |         u32 tsflags;
         |                    ^
         |                     = 0
   1 warning generated.

vim +/tsflags +926 net/core/sock.c

   917	
   918	int sock_set_tskey(struct sock *sk, int val, int type)
   919	{
   920		u32 tsflags;
   921	
   922		if (val & SOF_TIMESTAMPING_OPT_ID_TCP &&
   923		    !(val & SOF_TIMESTAMPING_OPT_ID))
   924			return -EINVAL;
   925	
 > 926		tsflags |= (sk->sk_tsflags[SOCKETOPT_TS_REQUESTOR] |
   927			    sk->sk_tsflags[BPFPROG_TS_REQUESTOR]);
   928		if (val & SOF_TIMESTAMPING_OPT_ID &&
   929		    !(tsflags & SOF_TIMESTAMPING_OPT_ID)) {
   930			if (sk_is_tcp(sk)) {
   931				if ((1 << sk->sk_state) &
   932				    (TCPF_CLOSE | TCPF_LISTEN))
   933					return -EINVAL;
   934				if (val & SOF_TIMESTAMPING_OPT_ID_TCP)
   935					atomic_set(&sk->sk_tskey, tcp_sk(sk)->write_seq);
   936				else
   937					atomic_set(&sk->sk_tskey, tcp_sk(sk)->snd_una);
   938			} else {
   939				atomic_set(&sk->sk_tskey, 0);
   940			}
   941		}
   942	
   943		return 0;
   944	}
   945	

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