kernel/fork.c:3088:2: warning: #warning clone3() entry point is missing, please fix

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   499551201b5f4fd3c0618a3e95e3d0d15ea18f31
commit: 505d66d1abfb90853e24ab6cbdf83b611473d6fc clone3: drop __ARCH_WANT_SYS_CLONE3 macro
date:   5 months ago
config: sparc-sparc32_defconfig (https://download.01.org/0day-ci/archive/20241221/202412210954.b4AprHmP-lkp@xxxxxxxxx/config)
compiler: sparc-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241221/202412210954.b4AprHmP-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202412210954.b4AprHmP-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   kernel/fork.c: In function '__do_sys_clone3':
>> kernel/fork.c:3088:2: warning: #warning clone3() entry point is missing, please fix [-Wcpp]
    3088 | #warning clone3() entry point is missing, please fix
         |  ^~~~~~~


vim +3088 kernel/fork.c

  3068	
  3069	/**
  3070	 * sys_clone3 - create a new process with specific properties
  3071	 * @uargs: argument structure
  3072	 * @size:  size of @uargs
  3073	 *
  3074	 * clone3() is the extensible successor to clone()/clone2().
  3075	 * It takes a struct as argument that is versioned by its size.
  3076	 *
  3077	 * Return: On success, a positive PID for the child process.
  3078	 *         On error, a negative errno number.
  3079	 */
  3080	SYSCALL_DEFINE2(clone3, struct clone_args __user *, uargs, size_t, size)
  3081	{
  3082		int err;
  3083	
  3084		struct kernel_clone_args kargs;
  3085		pid_t set_tid[MAX_PID_NS_LEVEL];
  3086	
  3087	#ifdef __ARCH_BROKEN_SYS_CLONE3
> 3088	#warning clone3() entry point is missing, please fix
  3089		return -ENOSYS;
  3090	#endif
  3091	
  3092		kargs.set_tid = set_tid;
  3093	
  3094		err = copy_clone_args_from_user(&kargs, uargs, size);
  3095		if (err)
  3096			return err;
  3097	
  3098		if (!clone3_args_valid(&kargs))
  3099			return -EINVAL;
  3100	
  3101		return kernel_clone(&kargs);
  3102	}
  3103	

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