linux-kernel - [dhowells-fs:fscache-rewrite-indexing 74/74] fs/cachefiles/namei.c:347:63: warning: variable 'ret' is uninitialized when used here

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Message-ID: <202110140648.mvwsAGc2-lkp@intel.com>
Date:   Thu, 14 Oct 2021 06:08:56 +0800
From:   kernel test robot <lkp@...el.com>
To:     David Howells <dhowells@...hat.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [dhowells-fs:fscache-rewrite-indexing 74/74]
 fs/cachefiles/namei.c:347:63: warning: variable 'ret' is uninitialized when
 used here

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git fscache-rewrite-indexing
head:   c4c64220b16dd9204a79685fe34d61c1b7f858a6
commit: c4c64220b16dd9204a79685fe34d61c1b7f858a6 [74/74] cachefiles: Add tracepoints to log errors from ops on the backing fs
config: i386-randconfig-r034-20211013 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project b6a8c695542b2987eb9a203d5663a0740cb4725f)
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/dhowells/linux-fs.git/commit/?id=c4c64220b16dd9204a79685fe34d61c1b7f858a6
        git remote add dhowells-fs https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git
        git fetch --no-tags dhowells-fs fscache-rewrite-indexing
        git checkout c4c64220b16dd9204a79685fe34d61c1b7f858a6
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=i386 

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 >>):

>> fs/cachefiles/namei.c:347:63: warning: variable 'ret' is uninitialized when used here [-Wuninitialized]
                   trace_cachefiles_vfs_error(object, d_backing_inode(dentry), ret,
                                                                               ^~~
   fs/cachefiles/namei.c:331:9: note: initialize the variable 'ret' to silence this warning
           int ret;
                  ^
                   = 0
   1 warning generated.


vim +/ret +347 fs/cachefiles/namei.c

   320	
   321	/*
   322	 * Open an existing file, checking its attributes and replacing it if it is
   323	 * stale.
   324	 */
   325	static bool cachefiles_open_file(struct cachefiles_object *object,
   326					 struct dentry *dentry)
   327	{
   328		struct cachefiles_cache *cache = object->volume->cache;
   329		struct file *file;
   330		struct path path;
   331		int ret;
   332	
   333		_enter("%pd", dentry);
   334	
   335		if (!cachefiles_mark_inode_in_use(object, dentry))
   336			return false;
   337	
   338		/* We need to open a file interface onto a data file now as we can't do
   339		 * it on demand because writeback called from do_exit() sees
   340		 * current->fs == NULL - which breaks d_path() called from ext4 open.
   341		 */
   342		path.mnt = cache->mnt;
   343		path.dentry = dentry;
   344		file = open_with_fake_path(&path, O_RDWR | O_LARGEFILE | O_DIRECT,
   345					   d_backing_inode(dentry), cache->cache_cred);
   346		if (IS_ERR(file)) {
 > 347			trace_cachefiles_vfs_error(object, d_backing_inode(dentry), ret,
   348						   cachefiles_trace_open_error);
   349			goto error;
   350		}
   351	
   352		if (unlikely(!file->f_op->read_iter) ||
   353		    unlikely(!file->f_op->write_iter)) {
   354			pr_notice("Cache does not support read_iter and write_iter\n");
   355			goto error_fput;
   356		}
   357		_debug("file -> %pd positive", dentry);
   358	
   359		ret = cachefiles_check_auxdata(object, file);
   360		if (ret < 0)
   361			goto check_failed;
   362	
   363		object->file = file;
   364	
   365		/* Always update the atime on an object we've just looked up (this is
   366		 * used to keep track of culling, and atimes are only updated by read,
   367		 * write and readdir but not lookup or open).
   368		 */
   369		touch_atime(&file->f_path);
   370		dput(dentry);
   371		return true;
   372	
   373	check_failed:
   374		fscache_cookie_lookup_negative(object->cookie);
   375		cachefiles_unmark_inode_in_use(object, file);
   376		cachefiles_mark_object_inactive(object, file);
   377		if (ret == -ESTALE) {
   378			fput(file);
   379			dput(dentry);
   380			return cachefiles_create_file(object);
   381		}
   382	error_fput:
   383		fput(file);
   384	error:
   385		dput(dentry);
   386		return false;
   387	}
   388	

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

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