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Message-ID: <202506282120.6vRwodm3-lkp@intel.com>
Date: Sat, 28 Jun 2025 21:59:49 +0200
From: kernel test robot <lkp@...el.com>
To: Arnd Bergmann <arnd@...db.de>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
linux-kernel@...r.kernel.org
Subject: kernel/fork.c:3088:2: warning: clone3() entry point is missing,
please fix
Hi Arnd,
FYI, the error/warning still remains.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: aaf724ed69264719550ec4f194d3ab17b886af9a
commit: 505d66d1abfb90853e24ab6cbdf83b611473d6fc clone3: drop __ARCH_WANT_SYS_CLONE3 macro
date: 12 months ago
config: hexagon-randconfig-2002-20250626 (https://download.01.org/0day-ci/archive/20250628/202506282120.6vRwodm3-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250628/202506282120.6vRwodm3-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202506282120.6vRwodm3-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from kernel/fork.c:34:
In file included from include/linux/mempolicy.h:15:
In file included from include/linux/pagemap.h:11:
In file included from include/linux/highmem.h:12:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:14:
In file included from arch/hexagon/include/asm/io.h:328:
include/asm-generic/io.h:548:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
548 | val = __raw_readb(PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:561:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
561 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
| ^
In file included from kernel/fork.c:34:
In file included from include/linux/mempolicy.h:15:
In file included from include/linux/pagemap.h:11:
In file included from include/linux/highmem.h:12:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:14:
In file included from arch/hexagon/include/asm/io.h:328:
include/asm-generic/io.h:574:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
574 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
| ^
In file included from kernel/fork.c:34:
In file included from include/linux/mempolicy.h:15:
In file included from include/linux/pagemap.h:11:
In file included from include/linux/highmem.h:12:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:14:
In file included from arch/hexagon/include/asm/io.h:328:
include/asm-generic/io.h:585:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
585 | __raw_writeb(value, PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:595:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
595 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:605:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
605 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
>> kernel/fork.c:3088:2: warning: clone3() entry point is missing, please fix [-W#warnings]
3088 | #warning clone3() entry point is missing, please fix
| ^
7 warnings generated.
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
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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