linux-kernel - [mtd:mtd/next 10/11] include/linux/kern_levels.h:5:25: warning: format '%ld' expects argument of type 'long int', but argument 4 has type 'unsigned int'

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Date:   Thu, 21 Apr 2022 21:22:48 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jean-Marc Eurin <jmeurin@...gle.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [mtd:mtd/next 10/11] include/linux/kern_levels.h:5:25: warning:
 format '%ld' expects argument of type 'long int', but argument 4 has type
 'unsigned int'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git mtd/next
head:   f812679fab605b3d5b853ed24a81dabb222ea23a
commit: 0629fcef16d703d384f76cb2c2c3a119a9149a34 [10/11] mtd: mtdoops: Create a header structure for the saved mtdoops.
config: arc-randconfig-r023-20220420 (https://download.01.org/0day-ci/archive/20220421/202204212112.2ixFkcQp-lkp@intel.com/config)
compiler: arc-elf-gcc (GCC) 11.2.0
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/mtd/linux.git/commit/?id=0629fcef16d703d384f76cb2c2c3a119a9149a34
        git remote add mtd https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git
        git fetch --no-tags mtd mtd/next
        git checkout 0629fcef16d703d384f76cb2c2c3a119a9149a34
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross W=1 O=build_dir ARCH=arc SHELL=/bin/bash drivers/mtd/

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 >>):

   In file included from include/linux/kernel.h:29,
                    from drivers/mtd/mtdoops.c:10:
   drivers/mtd/mtdoops.c: In function 'find_next_position':
>> include/linux/kern_levels.h:5:25: warning: format '%ld' expects argument of type 'long int', but argument 4 has type 'unsigned int' [-Wformat=]
       5 | #define KERN_SOH        "\001"          /* ASCII Start Of Header */
         |                         ^~~~~~
   include/linux/printk.h:418:25: note: in definition of macro 'printk_index_wrap'
     418 |                 _p_func(_fmt, ##__VA_ARGS__);                           \
         |                         ^~~~
   drivers/mtd/mtdoops.c:243:25: note: in expansion of macro 'printk'
     243 |                         printk(KERN_ERR "mtdoops: read failure at %ld (%td of %ld read), err %d\n",
         |                         ^~~~~~
   include/linux/kern_levels.h:11:25: note: in expansion of macro 'KERN_SOH'
      11 | #define KERN_ERR        KERN_SOH "3"    /* error conditions */
         |                         ^~~~~~~~
   drivers/mtd/mtdoops.c:243:32: note: in expansion of macro 'KERN_ERR'
     243 |                         printk(KERN_ERR "mtdoops: read failure at %ld (%td of %ld read), err %d\n",
         |                                ^~~~~~~~


vim +5 include/linux/kern_levels.h

314ba3520e513a Joe Perches 2012-07-30  4  
04d2c8c83d0e3a Joe Perches 2012-07-30 @5  #define KERN_SOH	"\001"		/* ASCII Start Of Header */
04d2c8c83d0e3a Joe Perches 2012-07-30  6  #define KERN_SOH_ASCII	'\001'
04d2c8c83d0e3a Joe Perches 2012-07-30  7  

:::::: The code at line 5 was first introduced by commit
:::::: 04d2c8c83d0e3ac5f78aeede51babb3236200112 printk: convert the format for KERN_<LEVEL> to a 2 byte pattern

:::::: TO: Joe Perches <joe@...ches.com>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

-- 
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