linux-kernel - [jlayton:ceph-sparse-read 13/13] net/ceph/messenger_v2.c:3642:56: warning: variable 'recved' is uninitialized when used here

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Date:   Tue, 15 Feb 2022 12:33:43 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jeff Layton <jlayton@...nel.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [jlayton:ceph-sparse-read 13/13] net/ceph/messenger_v2.c:3642:56:
 warning: variable 'recved' is uninitialized when used here

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git ceph-sparse-read
head:   c0521644c264a8578ab61182209f303610af16e7
commit: c0521644c264a8578ab61182209f303610af16e7 [13/13] libceph: add revoke support for sparse data
config: i386-randconfig-a003-20220214 (https://download.01.org/0day-ci/archive/20220215/202202151220.h4Fu215q-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 37f422f4ac31c8b8041c6b62065263314282dab6)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git/commit/?id=c0521644c264a8578ab61182209f303610af16e7
        git remote add jlayton https://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git
        git fetch --no-tags jlayton ceph-sparse-read
        git checkout c0521644c264a8578ab61182209f303610af16e7
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash net/ceph/

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

All warnings (new ones prefixed by >>):

>> net/ceph/messenger_v2.c:3642:56: warning: variable 'recved' is uninitialized when used here [-Wuninitialized]
           dout("%s con %p recved %d resid %d\n", __func__, con, recved, resid);
                                                                 ^~~~~~
   include/linux/ceph/ceph_debug.h:35:45: note: expanded from macro 'dout'
   # define dout(fmt, ...) pr_debug(" " fmt, ##__VA_ARGS__)
                                               ^~~~~~~~~~~
   include/linux/printk.h:570:26: note: expanded from macro 'pr_debug'
           dynamic_pr_debug(fmt, ##__VA_ARGS__)
                                   ^~~~~~~~~~~
   include/linux/dynamic_debug.h:163:22: note: expanded from macro 'dynamic_pr_debug'
                              pr_fmt(fmt), ##__VA_ARGS__)
                                             ^~~~~~~~~~~
   include/linux/dynamic_debug.h:152:56: note: expanded from macro '_dynamic_func_call'
           __dynamic_func_call(__UNIQUE_ID(ddebug), fmt, func, ##__VA_ARGS__)
                                                                 ^~~~~~~~~~~
   include/linux/dynamic_debug.h:134:15: note: expanded from macro '__dynamic_func_call'
                   func(&id, ##__VA_ARGS__);               \
                               ^~~~~~~~~~~
   net/ceph/messenger_v2.c:3635:12: note: initialize the variable 'recved' to silence this warning
           int recved, resid;  /* current piece of data */
                     ^
                      = 0
   1 warning generated.


vim +/recved +3642 net/ceph/messenger_v2.c

  3632	
  3633	static void revoke_at_prepare_sparse_data(struct ceph_connection *con)
  3634	{
  3635		int recved, resid;  /* current piece of data */
  3636		int remaining;
  3637	
  3638		WARN_ON(con_secure(con));
  3639		WARN_ON(!data_len(con->in_msg));
  3640		WARN_ON(!iov_iter_is_bvec(&con->v2.in_iter));
  3641		resid = iov_iter_count(&con->v2.in_iter);
> 3642		dout("%s con %p recved %d resid %d\n", __func__, con, recved, resid);
  3643	
  3644		remaining = CEPH_EPILOGUE_PLAIN_LEN + con->v2.data_len_remain;
  3645		con->v2.in_iter.count -= resid;
  3646		set_in_skip(con, resid + remaining);
  3647		con->v2.in_state = IN_S_FINISH_SKIP;
  3648	}
  3649	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org