Re: [brauner-vfs:vfs-7.2.vmsplice 2/4] fs/read_write.c:1219:1: warning: alias and aliasee have different types 'long (unsigned long, const struct iovec *, unsigned long, unsigned int)' and 'long (typeof (__builtin_choose_expr((__builtin_types_compatible_p(typeof ((unsigned long)0), typeof (0LL...

[Nathan Chancellor <nathan@kernel.org>]

On Tue, Jun 02, 2026 at 05:01:04PM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git vfs-7.2.vmsplice
> head:   2d4099641dbaed4b98711fc7d8ec94c5aec0a0f0
> commit: e2c0b2368081bef7d1f6758cc9e7edde8521237c [2/4] vmsplice: make vmsplice a trivial wrapper for preadv2/pwritev2
> config: um-allnoconfig (https://download.01.org/0day-ci/archive/20260602/202606021605.feT4WbtH-lkp@intel.com/config)
> compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project e5ab4f8a1f766febdc65ce89c00dec85393cfd68)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260602/202606021605.feT4WbtH-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/202606021605.feT4WbtH-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
>    fs/read_write.c:1176:1: warning: alias and aliasee have different types 'long (unsigned long, const struct iovec *, unsigned long, unsigned long, unsigned long)' and 'long (typeof (__builtin_choose_expr((__builtin_types_compatible_p(typeof ((unsigned long)0), typeof (0LL)) || __builtin_types_compatible_p(typeof ((unsigned long)0), typeof (0ULL))), 0LL, 0L)), typeof (__builtin_choose_expr((__builtin_types_compatible_p(typeof ((const struct iovec *)0), typeof (0LL)) || __builtin_types_compatible_p(typeof ((const struct iovec *)0), typeof (0ULL))), 0LL, 0L)), typeof (__builtin_choose_expr((__builtin_types_compatible_p(typeof ((unsigned long)0), typeof (0LL)) || __builtin_types_compatible_p(typeof ((unsigned long)0), typeof (0ULL))), 0LL, 0L)), typeof (__builtin_choose_expr((__builtin_types_compatible_p(typeof ((unsigned long)0), typeof (0LL)) || __builtin_types_compatible_p(typeof ((unsigned long)0), typeof (0ULL))), 0LL, 0L)), typeof (__builtin_choose_expr((__builtin_types_compatible_p(typeof ((unsigned long)0), typeof (0LL)) || __builtin_types_compatible_p(typeof ((unsigned long)0), typeof (0ULL))), 0LL, 0L)))' (aka 'long (long, long, long, long, long)') [-Wattribute-alias]
>     1176 | SYSCALL_DEFINE5(preadv, unsigned long, fd, const struct iovec __user *, vec,
>          | ^
>    include/linux/syscalls.h:229:36: note: expanded from macro 'SYSCALL_DEFINE5'
>      229 | #define SYSCALL_DEFINE5(name, ...) SYSCALL_DEFINEx(5, _##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))));    \
>          |                                ^
>    fs/read_write.c:1176:1: note: aliasee is declared here
>    include/linux/syscalls.h:229:36: note: expanded from macro 'SYSCALL_DEFINE5'
>      229 | #define SYSCALL_DEFINE5(name, ...) SYSCALL_DEFINEx(5, _##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>:43:1: note: expanded from here
>       43 | __se_sys_preadv
>          | ^

This should be addressed in Linus's tree with

  175db11786bd ("Disable -Wattribute-alias for clang-23 and newer")

-- 
Cheers,
Nathan