[PATCH] security: Add KUnit tests for rootid_owns_currentns()

[kernel test robot]

Hi Ryan,

kernel test robot noticed the following build errors:

[auto build test ERROR on pcmoore-selinux/next]
[also build test ERROR on linus/master v6.18-rc5 next-20251110]
[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/Ryan-Foster/security-Add-KUnit-tests-for-rootid_owns_currentns/20251110-223824
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux.git next
patch link:    https://lore.kernel.org/r/20251110143748.4144288-1-foster.ryan.r%40gmail.com
patch subject: [PATCH] security: Add KUnit tests for rootid_owns_currentns()
config: mips-randconfig-r053-20251111 (https://download.01.org/0day-ci/archive/20251111/202511111459.1ToyUP5p-lkp@intel.com/config)
compiler: mips-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251111/202511111459.1ToyUP5p-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202511111459.1ToyUP5p-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

>> security/commoncap_test.c:23:3: error: conflicting types for 'vfsuid_t'
    } vfsuid_t;
      ^~~~~~~~
   In file included from include/linux/fs.h:45,
                    from arch/mips/include/asm/elf.h:12,
                    from include/linux/elf.h:6,
                    from include/linux/module.h:20,
                    from include/kunit/test.h:24,
                    from security/commoncap_test.c:9:
   include/linux/mnt_idmapping.h:17:3: note: previous declaration of 'vfsuid_t' was here
    } vfsuid_t;
      ^~~~~~~~
>> security/commoncap_test.c:26:21: error: conflicting types for '__vfsuid_val'
    static inline uid_t __vfsuid_val(vfsuid_t uid)
                        ^~~~~~~~~~~~
   In file included from include/linux/fs.h:45,
                    from arch/mips/include/asm/elf.h:12,
                    from include/linux/elf.h:6,
                    from include/linux/module.h:20,
                    from include/kunit/test.h:24,
                    from security/commoncap_test.c:9:
   include/linux/mnt_idmapping.h:34:21: note: previous definition of '__vfsuid_val' was here
    static inline uid_t __vfsuid_val(vfsuid_t uid)
                        ^~~~~~~~~~~~
>> security/commoncap_test.c:31: warning: "VFSUIDT_INIT" redefined
    #define VFSUIDT_INIT(val) ((vfsuid_t){ __kuid_val(val) })
    
   In file included from include/linux/fs.h:45,
                    from arch/mips/include/asm/elf.h:12,
                    from include/linux/elf.h:6,
                    from include/linux/module.h:20,
                    from include/kunit/test.h:24,
                    from security/commoncap_test.c:9:
   include/linux/mnt_idmapping.h:109: note: this is the location of the previous definition
    #define VFSUIDT_INIT(val) (vfsuid_t){ __kuid_val(val) }
    


vim +/vfsuid_t +23 security/commoncap_test.c

    18	
    19	/* Forward declare the minimal types we need - match the actual kernel definitions */
    20	struct mnt_idmap;
    21	typedef struct {
    22		uid_t val;
  > 23	} vfsuid_t;
    24	
    25	/* Minimal macros we need - match kernel definitions from mnt_idmapping.h */
  > 26	static inline uid_t __vfsuid_val(vfsuid_t uid)
    27	{
    28		return uid.val;
    29	}
    30	
  > 31	#define VFSUIDT_INIT(val) ((vfsuid_t){ __kuid_val(val) })
    32	#define INVALID_VFSUID VFSUIDT_INIT(INVALID_UID)
    33	

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