[brauner-vfs:work.coredump.socket.protocol 9/13] fs/coredump.c:690:12: warning: 'coredump_request' defined but not used

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git work.coredump.socket.protocol
head:   cb5f73bef28a0477715f449b2ceb17e77a1b640a
commit: 9ce83f52a131f8806989e05df19215c433c8e7c8 [9/13] coredump: allow better parameter control
config: csky-randconfig-001-20250527 (https://download.01.org/0day-ci/archive/20250528/202505280036.xjAhNgLi-lkp@intel.com/config)
compiler: csky-linux-gcc (GCC) 12.4.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250528/202505280036.xjAhNgLi-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202505280036.xjAhNgLi-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> fs/coredump.c:690:12: warning: 'coredump_request' defined but not used [-Wunused-function]
     690 | static int coredump_request(struct core_name *cn, struct coredump_params *cprm)
         |            ^~~~~~~~~~~~~~~~


vim +/coredump_request +690 fs/coredump.c

   689	
 > 690	static int coredump_request(struct core_name *cn, struct coredump_params *cprm)
   691	{
   692		struct coredump_req req = {
   693			.size		= sizeof(struct coredump_req),
   694			.mask		= COREDUMP_KERNEL | COREDUMP_USERSPACE |
   695					  COREDUMP_REJECT | COREDUMP_WAIT,
   696			.size_ack	= sizeof(struct coredump_ack),
   697		};
   698		struct coredump_ack ack = {};
   699		ssize_t ret, usize;
   700	
   701		if (cn->core_type != COREDUMP_SOCK_REQ)
   702			return 0;
   703	
   704		/* Let userspace know what we support. */
   705		ret = coredump_sock_send(cprm->file, &req);
   706		if (ret)
   707			return ret;
   708	
   709		/*
   710		 * Peek the size of the coredump_ack struct that userspace
   711		 * wants to send us and then retrieve it all in one go.
   712		 */
   713		ret = coredump_sock_recv(cprm->file, &ack, sizeof(ack.size),
   714					 MSG_PEEK | MSG_WAITALL);
   715		if (ret)
   716			return ret;
   717	
   718		/*
   719		 * We told userspace what size we know about.
   720		 * So refuse anything too small or larger than we know.
   721		 */
   722		usize = ack.size;
   723		if (usize < COREDUMP_ACK_SIZE_VER0 || usize > sizeof(ack)) {
   724			coredump_sock_oob(cprm->file, COREDUMP_OOB_INVALIDSIZE);
   725			return -EINVAL;
   726		}
   727	
   728		/* Now retrieve the coredump_ack. */
   729		ret = coredump_sock_recv(cprm->file, &ack, usize, MSG_WAITALL);
   730		if (ret)
   731			return ret;
   732		if (ack.size != usize)
   733			return -EINVAL;
   734	
   735		/*
   736		 * We told userspace what flags we support.
   737		 * So refuse any flags we don't know.
   738		 */
   739		if (ack.mask & ~req.mask) {
   740			coredump_sock_oob(cprm->file, COREDUMP_OOB_UNSUPPORTED);
   741			return -EINVAL;
   742		}
   743	
   744		/* Handle mutually exclusive options. */
   745		if (hweight64(ack.mask & (COREDUMP_USERSPACE | COREDUMP_KERNEL |
   746					  COREDUMP_REJECT)) != 1) {
   747			coredump_sock_oob(cprm->file, COREDUMP_OOB_CONFLICTING);
   748			return -EINVAL;
   749		}
   750	
   751		cn->mask = ack.mask;
   752		return 0;
   753	}
   754	

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