Re: [PATCH v3 2/2] rust: workqueue: add creation of workqueues

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

Hi Alice,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f]

url:    https://github.com/intel-lab-lkp/linux/commits/Alice-Ryhl/rust-workqueue-restrict-delayed-work-to-global-wqs/20260227-230029
base:   6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f
patch link:    https://lore.kernel.org/r/20260227-create-workqueue-v3-2-87de133f7849%40google.com
patch subject: [PATCH v3 2/2] rust: workqueue: add creation of workqueues
config: riscv-randconfig-r063-20260228 (https://download.01.org/0day-ci/archive/20260228/202602281033.afIyhHsn-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 9a109fbb6e184ec9bcce10615949f598f4c974a9)
rustc: rustc 1.88.0 (6b00bc388 2025-06-23)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260228/202602281033.afIyhHsn-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/202602281033.afIyhHsn-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> clang diag: include/linux/workqueue.h:513:76: warning: diagnostic behavior may be improved by adding the 'format(printf, 1, 4)' attribute to the declaration of 'rust_helper_alloc_workqueue' [-Wmissing-format-attribute]
--
   In file included from rust/helpers/helpers.c:66:
>> rust/helpers/workqueue.c:22:9: warning: diagnostic behavior may be improved by adding the 'format(printf, 1, 4)' attribute to the declaration of 'rust_helper_alloc_workqueue' [-Wmissing-format-attribute]
      19 | struct workqueue_struct *rust_helper_alloc_workqueue(const char *fmt, unsigned int flags,
         | __attribute__((format(printf, 1, 4))) 
      20 |                                                      int max_active, const void *data)
      21 | {
      22 |         return alloc_workqueue(fmt, flags, max_active, data);
         |                ^
   include/linux/workqueue.h:513:76: note: expanded from macro 'alloc_workqueue'
     513 | #define alloc_workqueue(...)    alloc_hooks(alloc_workqueue_noprof(__VA_ARGS__))
         |                                                                               ^
   include/linux/alloc_tag.h:265:31: note: expanded from macro 'alloc_hooks'
     265 |         alloc_hooks_tag(&_alloc_tag, _do_alloc);                        \
         |                                      ^
   include/linux/alloc_tag.h:251:9: note: expanded from macro 'alloc_hooks_tag'
     251 |         typeof(_do_alloc) _res;                                         \
         |                ^
   rust/helpers/workqueue.c:19:26: note: 'rust_helper_alloc_workqueue' declared here
      19 | struct workqueue_struct *rust_helper_alloc_workqueue(const char *fmt, unsigned int flags,
         |                          ^
   1 warning generated.
--
   llvm-nm: error: rust/helpers/helpers.o: No such file or directory
>> clang diag: include/linux/workqueue.h:513:76: warning: diagnostic behavior may be improved by adding the 'format(printf, 1, 4)' attribute to the declaration of 'rust_helper_alloc_workqueue' [-Wmissing-format-attribute]

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