Re: [PATCH v15 37/43] dept: assign unique dept_key to each distinct wait_for_completion() caller

[kernel test robot <lkp@intel.com>]

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Hi Byungchul,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 82f2b0b97b36ee3fcddf0f0780a9a0825d52fec3]

url:    https://github.com/intel-lab-lkp/linux/commits/Byungchul-Park/llist-move-llist_-head-node-definition-to-types-h/20250513-181346
base:   82f2b0b97b36ee3fcddf0f0780a9a0825d52fec3
patch link:    https://lore.kernel.org/r/20250513100730.12664-38-byungchul%40sk.com
patch subject: [PATCH v15 37/43] dept: assign unique dept_key to each distinct wait_for_completion() caller
:::::: branch date: 24 hours ago
:::::: commit date: 24 hours ago
config: loongarch-randconfig-r071-20250514 (https://download.01.org/0day-ci/archive/20250514/202505141759.avvm2GOf-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 14.2.0

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: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202505141759.avvm2GOf-lkp@intel.com/

smatch warnings:
kernel/sched/completion.c:167 __wait_for_completion_timeout() error: 'wait_for_common()' returns negative and '__fake_return_0x7fd58a360280' is unsigned

vim +167 kernel/sched/completion.c

b8a216269ec0ce Peter Zijlstra 2013-10-04  151  
b8a216269ec0ce Peter Zijlstra 2013-10-04  152  /**
203be867bd3b2b Byungchul Park 2025-05-13  153   * __wait_for_completion_timeout: - waits for completion of a task (w/timeout)
b8a216269ec0ce Peter Zijlstra 2013-10-04  154   * @x:  holds the state of this particular completion
b8a216269ec0ce Peter Zijlstra 2013-10-04  155   * @timeout:  timeout value in jiffies
b8a216269ec0ce Peter Zijlstra 2013-10-04  156   *
b8a216269ec0ce Peter Zijlstra 2013-10-04  157   * This waits for either a completion of a specific task to be signaled or for a
b8a216269ec0ce Peter Zijlstra 2013-10-04  158   * specified timeout to expire. The timeout is in jiffies. It is not
b8a216269ec0ce Peter Zijlstra 2013-10-04  159   * interruptible.
b8a216269ec0ce Peter Zijlstra 2013-10-04  160   *
b8a216269ec0ce Peter Zijlstra 2013-10-04  161   * Return: 0 if timed out, and positive (at least 1, or number of jiffies left
b8a216269ec0ce Peter Zijlstra 2013-10-04  162   * till timeout) if completed.
b8a216269ec0ce Peter Zijlstra 2013-10-04  163   */
b8a216269ec0ce Peter Zijlstra 2013-10-04  164  unsigned long __sched
203be867bd3b2b Byungchul Park 2025-05-13  165  __wait_for_completion_timeout(struct completion *x, unsigned long timeout)
b8a216269ec0ce Peter Zijlstra 2013-10-04  166  {
b8a216269ec0ce Peter Zijlstra 2013-10-04 @167  	return wait_for_common(x, timeout, TASK_UNINTERRUPTIBLE);
b8a216269ec0ce Peter Zijlstra 2013-10-04  168  }
203be867bd3b2b Byungchul Park 2025-05-13  169  EXPORT_SYMBOL(__wait_for_completion_timeout);
b8a216269ec0ce Peter Zijlstra 2013-10-04  170  

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