linux-kernel - Re: [PATCH v3 03/10] eventfs: adding eventfs dir add functions

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Date:   Tue, 11 Jul 2023 10:24:03 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Ajay Kaher <akaher@...are.com>
Cc:     "mhiramat@...nel.org" <mhiramat@...nel.org>,
        "shuah@...nel.org" <shuah@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-trace-kernel@...r.kernel.org" 
        <linux-trace-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        Ching-lin Yu <chinglinyu@...gle.com>,
        Nadav Amit <namit@...are.com>,
        "srivatsa@...il.mit.edu" <srivatsa@...il.mit.edu>,
        Alexey Makhalov <amakhalov@...are.com>,
        Vasavi Sirnapalli <vsirnapalli@...are.com>,
        Tapas Kundu <tkundu@...are.com>,
        "er.ajay.kaher@...il.com" <er.ajay.kaher@...il.com>
Subject: Re: [PATCH v3 03/10] eventfs: adding eventfs dir add functions

On Mon, 10 Jul 2023 18:53:53 +0000
Ajay Kaher <akaher@...are.com> wrote:

> Something was broken in your mail (I guess cc list) and couldn’t reach to lkml or
> ignored by lkml. I just wanted to track the auto test results from linux-kselftest.

Below is the report from the tree I pushed. I guess I forgot to remove an
"idx" variable, and it also caught the unused functions you mentioned.

-- Steve


tree:   git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace trace/rfc/eventfs
head:   1dc48374bb8ad8aec6d7244267f9b36e0512d3bb
commit: 1dc48374bb8ad8aec6d7244267f9b36e0512d3bb [28/28] tracefs: Add RCU and global mutex for eventfs
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20230711/202307111415.tc8g7M63-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce: (https://download.01.org/0day-ci/archive/20230711/202307111415.tc8g7M63-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202307111415.tc8g7M63-lkp@intel.com/

All warnings (new ones prefixed by >>):

   fs/tracefs/event_inode.c: In function 'eventfs_post_create_dir':
>> fs/tracefs/event_inode.c:236:13: warning: unused variable 'idx' [-Wunused-variable]  
     236 |         int idx;
         |             ^~~
   fs/tracefs/event_inode.c: At top level:
   fs/tracefs/event_inode.c:184:23: warning: 'eventfs_create_dir' defined but not used [-Wunused-function]
     184 | static struct dentry *eventfs_create_dir(const char *name, umode_t mode,
         |                       ^~~~~~~~~~~~~~~~~~
   fs/tracefs/event_inode.c:108:23: warning: 'eventfs_create_file' defined but not used [-Wunused-function]
     108 | static struct dentry *eventfs_create_file(const char *name, umode_t mode,
         |                       ^~~~~~~~~~~~~~~~~~~


vim +/idx +236 fs/tracefs/event_inode.c

   225	
   226	/**
   227	 * eventfs_post_create_dir - post create dir routine
   228	 * @ef: eventfs_file of recently created dir
   229	 *
   230	 * Files with-in eventfs dir should know dentry of parent dir
   231	 */
   232	static void eventfs_post_create_dir(struct eventfs_file *ef)
   233	{
   234		struct eventfs_file *ef_child;
   235		struct tracefs_inode *ti;
 > 236		int idx;  
   237	
   238		/* srcu lock already held */
   239		/* fill parent-child relation */
   240		list_for_each_entry_srcu(ef_child, &ef->ei->e_top_files, list,
   241					 srcu_read_lock_held(&eventfs_srcu)) {
   242			ef_child->d_parent = ef->dentry;
   243		}
   244	
   245		ti = get_tracefs(ef->dentry->d_inode);
   246		ti->private = ef->ei;
   247	}
   248	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

-- Steve