linux-kernel - Re: [PATCH] kobject: Refactor kobject_set_name

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Date:   Sat, 7 May 2022 03:56:51 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jagdish Gediya <jvgediya@...ux.ibm.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
        rafael@...nel.org, akpm@...ux-foundation.org
Cc:     kbuild-all@...ts.01.org, keescook@...omium.org,
        andriy.shevchenko@...ux.intel.com, geert@...ux-m68k.org,
        linux@...ck-us.net, adobriyan@...il.com,
        Jagdish Gediya <jvgediya@...ux.ibm.com>
Subject: Re: [PATCH] kobject: Refactor kobject_set_name_vargs()

Hi Jagdish,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on driver-core/driver-core-testing]
[also build test WARNING on hnaz-mm/master linux/master linus/master v5.18-rc5 next-20220506]
[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]

url:    https://github.com/intel-lab-lkp/linux/commits/Jagdish-Gediya/kobject-Refactor-kobject_set_name_vargs/20220506-213448
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git bc443c31def574e3bfaed50cb493b8305ad79435
config: um-i386_defconfig (https://download.01.org/0day-ci/archive/20220507/202205070311.4T8ZKSWq-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.2.0-20) 11.2.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/4aac95bc8a052e61d5013a25a2099ed711e88fde
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Jagdish-Gediya/kobject-Refactor-kobject_set_name_vargs/20220506-213448
        git checkout 4aac95bc8a052e61d5013a25a2099ed711e88fde
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=um SUBARCH=i386 SHELL=/bin/bash

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 >>):

   mm/util.c: In function 'set_name_vargs':
>> mm/util.c:128:9: warning: function 'set_name_vargs' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
     128 |         s = kvasprintf_const(GFP_KERNEL, fmt, vargs);
         |         ^


vim +128 mm/util.c

   114	
   115	/**
   116	 * set_name_vargs() - Set the name as per format
   117	 * @name: pointer to point to the name as per format
   118	 * @fmt: format string used to build the name
   119	 * @vargs: vargs to format the string.
   120	 */
   121	int set_name_vargs(const char **name, const char *fmt, va_list vargs)
   122	{
   123		const char *s;
   124	
   125		if (*name && !fmt)
   126			return 0;
   127	
 > 128		s = kvasprintf_const(GFP_KERNEL, fmt, vargs);
   129		if (!s)
   130			return -ENOMEM;
   131	
   132		/*
   133		 * ewww... some of these buggers have '/' in the name ... If
   134		 * that's the case, we need to make sure we have an actual
   135		 * allocated copy to modify, since kvasprintf_const may have
   136		 * returned something from .rodata.
   137		 */
   138		if (strchr(s, '/')) {
   139			char *t;
   140	
   141			t = kstrdup(s, GFP_KERNEL);
   142			kfree_const(s);
   143			if (!t)
   144				return -ENOMEM;
   145			strreplace(t, '/', '!');
   146			s = t;
   147		}
   148		kfree_const(*name);
   149		*name = s;
   150	
   151		return 0;
   152	}
   153	EXPORT_SYMBOL(set_name_vargs);
   154	

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