linux-kernel - net/sunrpc/svcsock.c:527:32: warning: Variable 'uninitialized_var' is assigned a value that is never used. [unreadVariable]

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Message-ID: <202004090524.zHtJ3R2B%lkp@intel.com>
Date:   Thu, 9 Apr 2020 05:32:34 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Chuck Lever <chuck.lever@...cle.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: net/sunrpc/svcsock.c:527:32: warning: Variable 'uninitialized_var'
 is assigned a value that is never used. [unreadVariable]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   f5e94d10e4c468357019e5c28d48499f677b284f
commit: da1661b93bf489cdbc8bcea919b165d31b4810bf SUNRPC: Teach server to use xprt_sock_sendmsg for socket sends
date:   3 weeks ago

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@...el.com>


cppcheck warnings: (new ones prefixed by >>)

   net/sunrpc/svcsock.c:405:9: warning: union member 'Anonymous0::all' is never used. [unusedStructMember]
     long  all[SVC_PKTINFO_SPACE / sizeof(long)];
           ^
   net/sunrpc/svcsock.c:518:9: warning: union member 'Anonymous1::all' is never used. [unusedStructMember]
     long  all[SVC_PKTINFO_SPACE / sizeof(long)];
           ^
>> net/sunrpc/svcsock.c:527:32: warning: Variable 'uninitialized_var' is assigned a value that is never used. [unreadVariable]
    unsigned int uninitialized_var(sent);
                                  ^

vim +/uninitialized_var +527 net/sunrpc/svcsock.c

   504	
   505	/**
   506	 * svc_udp_sendto - Send out a reply on a UDP socket
   507	 * @rqstp: completed svc_rqst
   508	 *
   509	 * Returns the number of bytes sent, or a negative errno.
   510	 */
   511	static int svc_udp_sendto(struct svc_rqst *rqstp)
   512	{
   513		struct svc_xprt *xprt = rqstp->rq_xprt;
   514		struct svc_sock	*svsk = container_of(xprt, struct svc_sock, sk_xprt);
   515		struct xdr_buf *xdr = &rqstp->rq_res;
   516		union {
   517			struct cmsghdr	hdr;
   518			long		all[SVC_PKTINFO_SPACE / sizeof(long)];
   519		} buffer;
   520		struct cmsghdr *cmh = &buffer.hdr;
   521		struct msghdr msg = {
   522			.msg_name	= &rqstp->rq_addr,
   523			.msg_namelen	= rqstp->rq_addrlen,
   524			.msg_control	= cmh,
   525			.msg_controllen	= sizeof(buffer),
   526		};
 > 527		unsigned int uninitialized_var(sent);
   528		int err;
   529	
   530		svc_set_cmsg_data(rqstp, cmh);
   531	
   532		err = xprt_sock_sendmsg(svsk->sk_sock, &msg, xdr, 0, 0, &sent);
   533		xdr_free_bvec(xdr);
   534		if (err == -ECONNREFUSED) {
   535			/* ICMP error on earlier request. */
   536			err = xprt_sock_sendmsg(svsk->sk_sock, &msg, xdr, 0, 0, &sent);
   537			xdr_free_bvec(xdr);
   538		}
   539		if (err < 0)
   540			return err;
   541		return sent;
   542	}
   543	

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