linux-kernel - include/linux/kern_levels.h:5:25: warning: format '%u' expects a matching 'unsigned int' argument

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Date:   Thu, 10 Mar 2022 09:59:36 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: include/linux/kern_levels.h:5:25: warning: format '%u' expects a
 matching 'unsigned int' argument

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   330f4c53d3c2d8b11d86ec03a964b86dc81452f5
commit: 9dd78194a3722fa6712192cdd4f7032d45112a9a ARM: report Spectre v2 status through sysfs
date:   5 days ago
config: arm-randconfig-r023-20220309 (https://download.01.org/0day-ci/archive/20220310/202203100927.zuVzlGY0-lkp@intel.com/config)
compiler: arm-linux-gnueabi-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/torvalds/linux.git/commit/?id=9dd78194a3722fa6712192cdd4f7032d45112a9a
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 9dd78194a3722fa6712192cdd4f7032d45112a9a
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arm SHELL=/bin/bash arch/arm/mm/

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:20,
                    from arch/arm/mm/proc-v7-bugs.c:3:
   arch/arm/mm/proc-v7-bugs.c: In function 'spectre_v2_install_workaround':
>> include/linux/kern_levels.h:5:25: warning: format '%u' expects a matching 'unsigned int' argument [-Wformat=]
       5 | #define KERN_SOH        "\001"          /* ASCII Start Of Header */
         |                         ^~~~~~
   include/linux/printk.h:422:25: note: in definition of macro 'printk_index_wrap'
     422 |                 _p_func(_fmt, ##__VA_ARGS__);                           \
         |                         ^~~~
   include/linux/printk.h:523:9: note: in expansion of macro 'printk'
     523 |         printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
         |         ^~~~~~
   include/linux/kern_levels.h:14:25: note: in expansion of macro 'KERN_SOH'
      14 | #define KERN_INFO       KERN_SOH "6"    /* informational */
         |                         ^~~~~~~~
   include/linux/printk.h:523:16: note: in expansion of macro 'KERN_INFO'
     523 |         printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
         |                ^~~~~~~~~
   arch/arm/mm/proc-v7-bugs.c:111:9: note: in expansion of macro 'pr_info'
     111 |         pr_info("CPU%u: Spectre V2: workarounds disabled by configuration\n");
         |         ^~~~~~~
   arch/arm/mm/proc-v7-bugs.c: At top level:
   arch/arm/mm/proc-v7-bugs.c:205:6: warning: no previous prototype for 'cpu_v7_ca8_ibe' [-Wmissing-prototypes]
     205 | void cpu_v7_ca8_ibe(void)
         |      ^~~~~~~~~~~~~~
   arch/arm/mm/proc-v7-bugs.c:211:6: warning: no previous prototype for 'cpu_v7_ca15_ibe' [-Wmissing-prototypes]
     211 | void cpu_v7_ca15_ibe(void)
         |      ^~~~~~~~~~~~~~~
   arch/arm/mm/proc-v7-bugs.c:217:6: warning: no previous prototype for 'cpu_v7_bugs_init' [-Wmissing-prototypes]
     217 | void cpu_v7_bugs_init(void)
         |      ^~~~~~~~~~~~~~~~


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>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org