[boqun:shazptr-v2 4/8] kernel/locking/shazptr.c:134:25-30: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)

[boqun:shazptr-v2 4/8] kernel/locking/shazptr.c:134:25-30: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)

[kernel test robot]

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
TO: Boqun Feng <boqun.feng@gmail.com>
CC: "Paul E. McKenney" <paulmck@kernel.org>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/boqun/linux.git shazptr-v2
head:   904b8eaf21a993852b97d086d8d7a21916090cb9
commit: 31a43aa06d630ad79d471b02aee3348e369e6ba8 [4/8] shazptr: Avoid synchronize_shaptr() busy waiting
:::::: branch date: 25 hours ago
:::::: commit date: 25 hours ago
config: xtensa-randconfig-r053-20251118 (https://download.01.org/0day-ci/archive/20251119/202511190017.SU1AkQK2-lkp@intel.com/config)
compiler: xtensa-linux-gcc (GCC) 10.5.0

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>
| Reported-by: Julia Lawall <julia.lawall@inria.fr>
| Closes: https://lore.kernel.org/r/202511190017.SU1AkQK2-lkp@intel.com/

cocci warnings: (new ones prefixed by >>)
>> kernel/locking/shazptr.c:134:25-30: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)

vim +134 kernel/locking/shazptr.c

31a43aa06d630a Boqun Feng 2025-04-13  122  
31a43aa06d630a Boqun Feng 2025-04-13  123  /* Scan structure for synchronize_shazptr(). */
31a43aa06d630a Boqun Feng 2025-04-13  124  struct shazptr_scan {
31a43aa06d630a Boqun Feng 2025-04-13  125  	struct task_struct *thread;
31a43aa06d630a Boqun Feng 2025-04-13  126  	struct swait_queue_head wq;
31a43aa06d630a Boqun Feng 2025-04-13  127  	struct list_head scanning;
31a43aa06d630a Boqun Feng 2025-04-13  128  	int cpu_grp_size;
31a43aa06d630a Boqun Feng 2025-04-13  129  
31a43aa06d630a Boqun Feng 2025-04-13  130  	struct mutex lock;
31a43aa06d630a Boqun Feng 2025-04-13  131  	struct list_head queued;		/* __guard_by(lock) */
31a43aa06d630a Boqun Feng 2025-04-13  132  	bool scheduled;				/* __guard_by(lock) */
31a43aa06d630a Boqun Feng 2025-04-13  133  
31a43aa06d630a Boqun Feng 2025-04-13 @134  	struct shazptr_snapshot snaps[0];	/* __counted_by(nr_cpu_ids) */
31a43aa06d630a Boqun Feng 2025-04-13  135  };
31a43aa06d630a Boqun Feng 2025-04-13  136  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki