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* [akpm-mm:mm-unstable 273/420] mm/userfaultfd.c:4475:1: warning: alias and aliasee have different types 'long (int)' and 'long (typeof (__builtin_choose_expr((__builtin_types_compatible_p(typeof ((int)0), typeof (0LL)) || __builtin_types_compatible_p(typeof ((int)0), typeof (0ULL))), 0...
@ 2026-05-28 15:28 kernel test robot
  2026-05-28 16:45 ` Nathan Chancellor
  0 siblings, 1 reply; 2+ messages in thread
From: kernel test robot @ 2026-05-28 15:28 UTC (permalink / raw)
  To: Mike Rapoport (Microsoft)
  Cc: llvm, oe-kbuild-all, David Hildenbrand, Andrew Morton,
	Linux Memory Management List, mm-commits

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
head:   8a74e22643189e0ae339afc91110ddb4cab1941b
commit: 688eee218159283140c8c4b48429cfe400cb64e4 [273/420] userfaultfd: merge fs/userfaultfd.c into mm/userfaultfd.c
config: arm-randconfig-003-20260528 (https://download.01.org/0day-ci/archive/20260528/202605282311.BlbuvsRF-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 9409c07de6378507397ecdb6f05f628f58110112)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260528/202605282311.BlbuvsRF-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/202605282311.BlbuvsRF-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/userfaultfd.c:4475:1: warning: alias and aliasee have different types 'long (int)' and 'long (typeof (__builtin_choose_expr((__builtin_types_compatible_p(typeof ((int)0), typeof (0LL)) || __builtin_types_compatible_p(typeof ((int)0), typeof (0ULL))), 0LL, 0L)))' (aka 'long (long)') [-Wattribute-alias]
    4475 | SYSCALL_DEFINE1(userfaultfd, int, flags)
         | ^
   include/linux/syscalls.h:225:36: note: expanded from macro 'SYSCALL_DEFINE1'
     225 | #define SYSCALL_DEFINE1(name, ...) SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
         |                                    ^
   include/linux/syscalls.h:236:2: note: expanded from macro 'SYSCALL_DEFINEx'
     236 |         __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
         |         ^
   include/linux/syscalls.h:251:18: note: expanded from macro '__SYSCALL_DEFINEx'
     251 |                 __attribute__((alias(__stringify(__se_sys##name))));    \
         |                                ^
   mm/userfaultfd.c:4475:1: note: aliasee is declared here
   include/linux/syscalls.h:225:36: note: expanded from macro 'SYSCALL_DEFINE1'
     225 | #define SYSCALL_DEFINE1(name, ...) SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
         |                                    ^
   include/linux/syscalls.h:236:2: note: expanded from macro 'SYSCALL_DEFINEx'
     236 |         __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
         |         ^
   include/linux/syscalls.h:255:18: note: expanded from macro '__SYSCALL_DEFINEx'
     255 |         asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))  \
         |                         ^
   <scratch space>:46:1: note: expanded from here
      46 | __se_sys_userfaultfd
         | ^
   1 warning generated.


vim +4475 mm/userfaultfd.c

  4474	
> 4475	SYSCALL_DEFINE1(userfaultfd, int, flags)
  4476	{
  4477		if (!userfaultfd_syscall_allowed(flags))
  4478			return -EPERM;
  4479	
  4480		return new_userfaultfd(flags);
  4481	}
  4482	

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

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2026-05-28 15:28 [akpm-mm:mm-unstable 273/420] mm/userfaultfd.c:4475:1: warning: alias and aliasee have different types 'long (int)' and 'long (typeof (__builtin_choose_expr((__builtin_types_compatible_p(typeof ((int)0), typeof (0LL)) || __builtin_types_compatible_p(typeof ((int)0), typeof (0ULL))), 0 kernel test robot
2026-05-28 16:45 ` Nathan Chancellor

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