Re: [PATCH] lkdtm: Add lockdep related crash tests

[kernel test robot <lkp@intel.com>]

Hi Tzung-Bi,

kernel test robot noticed the following build warnings:

[auto build test WARNING on char-misc/char-misc-testing]
[also build test WARNING on char-misc/char-misc-next char-misc/char-misc-linus kees/for-next/pstore kees/for-next/kspp soc/for-next linus/master v6.18-rc5 next-20251114]
[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/Tzung-Bi-Shih/lkdtm-Add-lockdep-related-crash-tests/20251114-142702
base:   char-misc/char-misc-testing
patch link:    https://lore.kernel.org/r/20251114062535.1827309-1-tzungbi%40kernel.org
patch subject: [PATCH] lkdtm: Add lockdep related crash tests
config: parisc-defconfig (https://download.01.org/0day-ci/archive/20251115/202511152240.uaKhTU6M-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251115/202511152240.uaKhTU6M-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202511152240.uaKhTU6M-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/misc/lkdtm/lockdep.c: In function 'lkdtm_LOCKDEP_CIRCULAR_LOCK':
>> drivers/misc/lkdtm/lockdep.c:21:48: warning: suggest braces around empty body in an 'else' statement [-Wempty-body]
      21 |                 scoped_guard(spinlock, &lock_B);
         |                                                ^
   drivers/misc/lkdtm/lockdep.c:23:48: warning: suggest braces around empty body in an 'else' statement [-Wempty-body]
      23 |                 scoped_guard(spinlock, &lock_A);
         |                                                ^
   drivers/misc/lkdtm/lockdep.c: In function 'lkdtm_LOCKDEP_INCONSISTENT_LOCK':
   drivers/misc/lkdtm/lockdep.c:37:40: warning: suggest braces around empty body in an 'else' statement [-Wempty-body]
      37 |         scoped_guard(spinlock, &lock_A);
         |                                        ^
   drivers/misc/lkdtm/lockdep.c:40:40: warning: suggest braces around empty body in an 'else' statement [-Wempty-body]
      40 |         scoped_guard(spinlock, &lock_A);
         |                                        ^


vim +/else +21 drivers/misc/lkdtm/lockdep.c

    16	
    17	/* For "WARNING: possible circular locking dependency detected". */
    18	static void lkdtm_LOCKDEP_CIRCULAR_LOCK(void)
    19	{
    20		scoped_guard(spinlock, &lock_A)
  > 21			scoped_guard(spinlock, &lock_B);
    22		scoped_guard(spinlock, &lock_B)
    23			scoped_guard(spinlock, &lock_A);
    24	}
    25	

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