[akpm-mm:mm-unstable 274/423] mm/userfaultfd.c:4475:1: warning: alias and aliasee have different types 'long (ulong, ulong, ulong, ulong, ulong, ulong, ulong)' (aka 'long (unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long)') and 'l...

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
head:   6bb9014e347a15dfa837cbc52451035466d86ddf
commit: 53313230f720eaaf9f1f6d20faafd7e01a9e09b7 [274/423] userfaultfd: merge fs/userfaultfd.c into mm/userfaultfd.c
config: riscv-randconfig-r122-20260529 (https://download.01.org/0day-ci/archive/20260603/202606031038.1aPfmoCm-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 9409c07de6378507397ecdb6f05f628f58110112)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260603/202606031038.1aPfmoCm-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/202606031038.1aPfmoCm-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/userfaultfd.c:4475:1: warning: alias and aliasee have different types 'long (ulong, ulong, ulong, ulong, ulong, ulong, ulong)' (aka 'long (unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long)') 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__)
         |         ^
   arch/riscv/include/asm/syscall_wrapper.h:82:2: note: expanded from macro '__SYSCALL_DEFINEx'
      82 |         __SYSCALL_SE_DEFINEx(x, sys, name, __VA_ARGS__)                         \
         |         ^
   arch/riscv/include/asm/syscall_wrapper.h:37:19: note: expanded from macro '__SYSCALL_SE_DEFINEx'
      37 |                         __attribute__((alias(__stringify(___se_##prefix##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__)
         |         ^
   arch/riscv/include/asm/syscall_wrapper.h:82:2: note: expanded from macro '__SYSCALL_DEFINEx'
      82 |         __SYSCALL_SE_DEFINEx(x, sys, name, __VA_ARGS__)                         \
         |         ^
   arch/riscv/include/asm/syscall_wrapper.h:41:14: note: expanded from macro '__SYSCALL_SE_DEFINEx'
      41 |         static long ___se_##prefix##name(__MAP(x,__SC_LONG,__VA_ARGS__))
         |                     ^
   <scratch space>:148:1: note: expanded from here
     148 | ___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	

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