arch/riscv/include/asm/syscall_wrapper.h:35:14: warning: '__se_sys_userfaultfd' alias between functions of incompatible types 'long int(ulong, ulong, ulong, ulong, ulong, ulong, ulong)' {aka 'long int(long unsigned int, long unsigned int, long uns...

arch/riscv/include/asm/syscall_wrapper.h:35:14: warning: '__se_sys_userfaultfd' alias between functions of incompatible types 'long int(ulong, ulong, ulong, ulong, ulong, ulong, ulong)' {aka 'long int(long unsigned int, long unsigned int, long uns...

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   8d3ae59288f1e7d58d76558a6ee96d533bc5019f
commit: 7bc5e747bba29d5b77b2278e8c696eea0c796706 userfaultfd: merge fs/userfaultfd.c into mm/userfaultfd.c
date:   2 months ago
config: riscv-randconfig-r062-20260818 (https://download.01.org/0day-ci/archive/20260818/202608181601.lxsFodJY-lkp@intel.com/config)
compiler: riscv32-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260818/202608181601.lxsFodJY-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
| Fixes: 7bc5e747bba2 ("userfaultfd: merge fs/userfaultfd.c into mm/userfaultfd.c")
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202608181601.lxsFodJY-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/compat.h:34,
                    from arch/riscv/include/asm/elf.h:12,
                    from include/linux/elf.h:6,
                    from include/linux/module.h:20,
                    from include/linux/device/driver.h:21,
                    from include/linux/device.h:32,
                    from include/linux/blk_types.h:11,
                    from include/linux/writeback.h:13,
                    from include/linux/memcontrol.h:23,
                    from include/linux/rmap.h:12,
                    from mm/userfaultfd.c:16:
>> arch/riscv/include/asm/syscall_wrapper.h:35:14: warning: '__se_sys_userfaultfd' alias between functions of incompatible types 'long int(ulong,  ulong,  ulong,  ulong,  ulong,  ulong,  ulong)' {aka 'long int(long unsigned int,  long unsigned int,  long unsigned int,  long unsigned int,  long unsigned int,  long unsigned int,  long unsigned int)'} and 'long int(long int)' [-Wattribute-alias]
     static long __se_##prefix##name(ulong, ulong, ulong, ulong, ulong, ulong,  \
                 ^~~~~
   arch/riscv/include/asm/syscall_wrapper.h:82:2: note: in expansion of macro '__SYSCALL_SE_DEFINEx'
     __SYSCALL_SE_DEFINEx(x, sys, name, __VA_ARGS__)    \
     ^~~~~~~~~~~~~~~~~~~~
   include/linux/syscalls.h:236:2: note: in expansion of macro '__SYSCALL_DEFINEx'
     __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
     ^~~~~~~~~~~~~~~~~
   include/linux/syscalls.h:225:36: note: in expansion of macro 'SYSCALL_DEFINEx'
    #define SYSCALL_DEFINE1(name, ...) SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
                                       ^~~~~~~~~~~~~~~
   mm/userfaultfd.c:4475:1: note: in expansion of macro 'SYSCALL_DEFINE1'
    SYSCALL_DEFINE1(userfaultfd, int, flags)
    ^~~~~~~~~~~~~~~
   arch/riscv/include/asm/syscall_wrapper.h:41:14: note: aliased declaration here
     static long ___se_##prefix##name(__MAP(x,__SC_LONG,__VA_ARGS__))
                 ^~~~~~
   arch/riscv/include/asm/syscall_wrapper.h:82:2: note: in expansion of macro '__SYSCALL_SE_DEFINEx'
     __SYSCALL_SE_DEFINEx(x, sys, name, __VA_ARGS__)    \
     ^~~~~~~~~~~~~~~~~~~~
   include/linux/syscalls.h:236:2: note: in expansion of macro '__SYSCALL_DEFINEx'
     __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
     ^~~~~~~~~~~~~~~~~
   include/linux/syscalls.h:225:36: note: in expansion of macro 'SYSCALL_DEFINEx'
    #define SYSCALL_DEFINE1(name, ...) SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
                                       ^~~~~~~~~~~~~~~
   mm/userfaultfd.c:4475:1: note: in expansion of macro 'SYSCALL_DEFINE1'
    SYSCALL_DEFINE1(userfaultfd, int, flags)
    ^~~~~~~~~~~~~~~


vim +35 arch/riscv/include/asm/syscall_wrapper.h

a9ad73295cc1e3 Sami Tolvanen 2024-03-11  16  
a9ad73295cc1e3 Sami Tolvanen 2024-03-11  17  #define __SYSCALL_SE_DEFINEx(x, prefix, name, ...)					\
a9ad73295cc1e3 Sami Tolvanen 2024-03-11  18  	static long __se_##prefix##name(__MAP(x,__SC_LONG,__VA_ARGS__));		\
a9ad73295cc1e3 Sami Tolvanen 2024-03-11  19  	static long __se_##prefix##name(__MAP(x,__SC_LONG,__VA_ARGS__))
a9ad73295cc1e3 Sami Tolvanen 2024-03-11  20  
08d0ce30e0e4fc Sami Tolvanen 2023-07-10  21  #define SC_RISCV_REGS_TO_ARGS(x, ...)							\
08d0ce30e0e4fc Sami Tolvanen 2023-07-10  22  	__MAP(x,__SC_ARGS								\
08d0ce30e0e4fc Sami Tolvanen 2023-07-10  23  	      ,,regs->orig_a0,,regs->a1,,regs->a2					\
08d0ce30e0e4fc Sami Tolvanen 2023-07-10  24  	      ,,regs->a3,,regs->a4,,regs->a5,,regs->a6)
08d0ce30e0e4fc Sami Tolvanen 2023-07-10  25  
a9ad73295cc1e3 Sami Tolvanen 2024-03-11  26  #else
a9ad73295cc1e3 Sami Tolvanen 2024-03-11  27  /*
a9ad73295cc1e3 Sami Tolvanen 2024-03-11  28   * Use type aliasing to ensure registers a0-a6 are correctly passed to the syscall
a9ad73295cc1e3 Sami Tolvanen 2024-03-11  29   * implementation when >word-size arguments are used.
a9ad73295cc1e3 Sami Tolvanen 2024-03-11  30   */
a9ad73295cc1e3 Sami Tolvanen 2024-03-11  31  #define __SYSCALL_SE_DEFINEx(x, prefix, name, ...)					\
a9ad73295cc1e3 Sami Tolvanen 2024-03-11  32  	__diag_push();									\
a9ad73295cc1e3 Sami Tolvanen 2024-03-11  33  	__diag_ignore(GCC, 8, "-Wattribute-alias",					\
a9ad73295cc1e3 Sami Tolvanen 2024-03-11  34  			"Type aliasing is used to sanitize syscall arguments");		\
a9ad73295cc1e3 Sami Tolvanen 2024-03-11 @35  	static long __se_##prefix##name(ulong, ulong, ulong, ulong, ulong, ulong, 	\
a9ad73295cc1e3 Sami Tolvanen 2024-03-11  36  					ulong)						\
a9ad73295cc1e3 Sami Tolvanen 2024-03-11  37  			__attribute__((alias(__stringify(___se_##prefix##name))));	\
a9ad73295cc1e3 Sami Tolvanen 2024-03-11  38  	__diag_pop();									\
653650c468be21 Sami Tolvanen 2024-03-26  39  	static long noinline ___se_##prefix##name(__MAP(x,__SC_LONG,__VA_ARGS__))	\
653650c468be21 Sami Tolvanen 2024-03-26  40  			__used;								\
a9ad73295cc1e3 Sami Tolvanen 2024-03-11  41  	static long ___se_##prefix##name(__MAP(x,__SC_LONG,__VA_ARGS__))
a9ad73295cc1e3 Sami Tolvanen 2024-03-11  42  

:::::: The code at line 35 was first introduced by commit
:::::: a9ad73295cc1e3af0253eee7d08943b2419444c4 riscv: Fix syscall wrapper for >word-size arguments

:::::: TO: Sami Tolvanen <samitolvanen@google.com>
:::::: CC: Palmer Dabbelt <palmer@rivosinc.com>

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https://github.com/intel/lkp-tests/wiki