[openeuler:OLK-6.6 3355/3355] kernel/xsched/vstream.c:94:19: warning: no previous prototype for function 'xcu_find'

28 Nov 2025

      tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   ae3faae9efa6dabe1e7613b5e5d3758ffaefb86a
commit: 8dde1f2e6bf6049bf69c9f510349c698e0aba49d [3355/3355] xsched: Introduce vstream management
config: loongarch-allyesconfig (https://download.01.org/0day-ci/archive/20251128/202511281845.H2cg7rYT-lkp@i...)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 9e9fe08b16ea2c4d9867fb4974edf2a3776d6ece)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251128/202511281845.H2cg7rYT-lkp@i...)

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/202511281845.H2cg7rYT-lkp@intel.com/

All warnings (new ones prefixed by >>):
...
...
kernel/xsched/vstream.c:94:19: warning: no previous prototype for function 'xcu_find' [-Wmissing-prototypes]
      94 | struct xsched_cu *xcu_find(uint32_t type,
         |                   ^
   kernel/xsched/vstream.c:94:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
      94 | struct xsched_cu *xcu_find(uint32_t type,
         | ^
         | static 
   1 warning generated.
vim +/xcu_find +94 kernel/xsched/vstream.c

    93
...
94	struct xsched_cu *xcu_find(uint32_t type,
    95					uint32_t dev_id, uint32_t channel_id)
    96	{
    97		struct xcu_group *group = NULL;
    98	
    99		/* Find xcu by type. */
   100		group = xcu_group_find(xcu_group_root, type);
   101		if (group == NULL) {
   102			XSCHED_ERR("Fail to find type group.\n");
   103			return NULL;
   104		}
   105	
   106		/* Find device id group. */
   107		group = xcu_group_find(group, dev_id);
   108		if (group == NULL) {
   109			XSCHED_ERR("Fail to find device group.\n");
   110			return NULL;
   111		}
   112		/* Find channel id group. */
   113		group = xcu_group_find(group, channel_id);
   114		if (group == NULL) {
   115			XSCHED_ERR("Fail to find channel group.\n");
   116			return NULL;
   117		}
   118	
   119		XSCHED_DEBUG("XCU found: type=%u, dev_id=%u, chan_id=%u.\n",
   120			type, dev_id, channel_id);
   121	
   122		return group->xcu;
   123	}
   124
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