linux-kernel - Re: [PATCH v2 fixed line wrap mangling] fuse: Add support for fuse stacked I/O

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Date:	Fri, 15 Jan 2016 03:19:29 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Nikhilesh Reddy <reddyn@...eaurora.org>
Cc:	kbuild-all@...org, Miklos Szeredi <miklos@...redi.hu>,
	fuse-devel <fuse-devel@...ts.sourceforge.net>,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	Greg KH <gregkh@...uxfoundation.org>,
	torvalds@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	viro@...iv.linux.org.uk, Richard Weinberger <richard@....at>,
	Theodore Ts'o <tytso@....edu>, jack@...e.cz,
	Antonio SJ Musumeci <trapexit@...wn.link>, sven.utcke@....de,
	Nikolaus Rath <nikolaus@...h.org>
Subject: Re: [PATCH v2 fixed line wrap mangling] fuse: Add support for fuse
 stacked I/O

Hi Nikhilesh,

[auto build test WARNING on v4.4-rc8]
[also build test WARNING on next-20160114]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Nikhilesh-Reddy/fuse-Add-support-for-fuse-stacked-I-O/20160115-030449
config: i386-randconfig-x005-01140835 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

   fs/fuse/file.c: In function 'fuse_do_open':
>> fs/fuse/file.c:148:22: warning: 'lower_file' may be used uninitialized in this function [-Wmaybe-uninitialized]
       ff->rw_lower_file = lower_file;
                         ^

vim +/lower_file +148 fs/fuse/file.c

   132	
   133		ff = fuse_file_alloc(fc);
   134		if (!ff)
   135			return -ENOMEM;
   136	
   137		ff->fh = 0;
   138		ff->open_flags = FOPEN_KEEP_CACHE; /* Default for no-open */
   139		if (!fc->no_open || isdir) {
   140			struct fuse_open_out outarg;
   141			int err;
   142	
   143			err = fuse_send_open(fc, nodeid, file, opcode, &outarg,
   144					     &(lower_file));
   145			if (!err) {
   146				ff->fh = outarg.fh;
   147				ff->open_flags = outarg.open_flags;
 > 148				ff->rw_lower_file = lower_file;
   149	
   150			} else if (err != -ENOSYS || isdir) {
   151				fuse_file_free(ff);
   152				return err;
   153			} else {
   154				fc->no_open = 1;
   155			}
   156		}

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