linux-kernel - Re: [PATCH] Fixed the build warning in init_trace_printk_function

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Message-ID: <202509080040.8gEyq9Ef-lkp@intel.com>
Date: Mon, 8 Sep 2025 01:01:05 +0800
From: kernel test robot <lkp@...el.com>
To: Fidal Palamparambil <rootuserhere@...il.com>,
	linux-modules@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev, mcgrof@...nel.org, petr.pavlu@...e.com,
	da.gomez@...nel.org, samitolvanen@...gle.com,
	linux-kernel@...r.kernel.org,
	Fidal palamparambil <rootuserhere@...il.com>
Subject: Re: [PATCH] Fixed the build warning in
 init_trace_printk_function_export():

Hi Fidal,

kernel test robot noticed the following build warnings:

[auto build test WARNING on trace/for-next]
[also build test WARNING on linus/master v6.17-rc4 next-20250905]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Fidal-Palamparambil/Fixed-the-build-warning-in-init_trace_printk_function_export/20250907-221041
base:   https://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace for-next
patch link:    https://lore.kernel.org/r/20250907140755.529-1-rootuserhere%40gmail.com
patch subject: [PATCH] Fixed the build warning in init_trace_printk_function_export():
config: x86_64-buildonly-randconfig-001-20250907 (https://download.01.org/0day-ci/archive/20250908/202509080040.8gEyq9Ef-lkp@intel.com/config)
compiler: gcc-13 (Debian 13.3.0-16) 13.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250908/202509080040.8gEyq9Ef-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/202509080040.8gEyq9Ef-lkp@intel.com/

All warnings (new ones prefixed by >>):

   kernel/trace/trace_printk.c: In function 'ftrace_formats_open':
>> kernel/trace/trace_printk.c:369:25: warning: passing argument 1 of 'seq_open' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     369 |         return seq_open(file, &show_format_seq_ops);
         |                         ^~~~
   In file included from kernel/trace/trace_printk.c:8:
   include/linux/seq_file.h:108:14: note: expected 'struct file *' but argument is of type 'const struct file *'
     108 | int seq_open(struct file *, const struct seq_operations *);
         |              ^~~~~~~~~~~~~
   kernel/trace/trace_printk.c: At top level:
   kernel/trace/trace_printk.c:373:17: error: initialization of 'int (*)(struct inode *, struct file *)' from incompatible pointer type 'int (*)(struct inode *, const struct file *)' [-Werror=incompatible-pointer-types]
     373 |         .open = ftrace_formats_open,
         |                 ^~~~~~~~~~~~~~~~~~~
   kernel/trace/trace_printk.c:373:17: note: (near initialization for 'ftrace_formats_fops.open')
   cc1: some warnings being treated as errors


vim +369 kernel/trace/trace_printk.c

7975a2be16dd42 Steven Rostedt          2009-03-12  359  
7975a2be16dd42 Steven Rostedt          2009-03-12  360  static int
66670b02cb828c Fidal palamparambil     2025-09-07  361  ftrace_formats_open(struct inode *inode, const struct file *file)
7975a2be16dd42 Steven Rostedt          2009-03-12  362  {
17911ff38aa58d Steven Rostedt (VMware  2019-10-11  363) 	int ret;
17911ff38aa58d Steven Rostedt (VMware  2019-10-11  364) 
17911ff38aa58d Steven Rostedt (VMware  2019-10-11  365) 	ret = security_locked_down(LOCKDOWN_TRACEFS);
17911ff38aa58d Steven Rostedt (VMware  2019-10-11  366) 	if (ret)
17911ff38aa58d Steven Rostedt (VMware  2019-10-11  367) 		return ret;
17911ff38aa58d Steven Rostedt (VMware  2019-10-11  368) 
c8961ec6da22ea Li Zefan                2009-06-24 @369  	return seq_open(file, &show_format_seq_ops);
7975a2be16dd42 Steven Rostedt          2009-03-12  370  }
7975a2be16dd42 Steven Rostedt          2009-03-12  371  

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