[openeuler:openEuler-1.0-LTS 1942/1942] drivers/gpu/drm/nouveau/nvkm/core/object.c:37:19: warning: mixing declarations and code is a C99 extension

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

Hi Dave,

First bad commit (maybe != root cause):

tree:   https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS
head:   5a399b91821faeec2466751db2d714b24f8eb17c
commit: 901dbb48d8a4f60af427f1ec67ac1247ff219f39 [1942/1942] nouveau: lock the client object tree.
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20251214/202512140652.dui78VGp-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 1335a05ab8bc8339ce24be3a9da89d8c3f4e0571)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251214/202512140652.dui78VGp-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/202512140652.dui78VGp-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/nouveau/nvkm/core/object.c:37:19: warning: mixing declarations and code is a C99 extension [-Wdeclaration-after-statement]
      37 |                 struct rb_node *node = client->objroot.rb_node;
         |                                 ^
   1 warning generated.


vim +37 drivers/gpu/drm/nouveau/nvkm/core/object.c

9274f4a9ba7e70 drivers/gpu/drm/nouveau/core/core/object.c Ben Skeggs  2012-07-06  27  
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  28  struct nvkm_object *
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  29  nvkm_object_search(struct nvkm_client *client, u64 handle,
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  30  		   const struct nvkm_object_func *func)
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  31  {
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  32  	struct nvkm_object *object;
901dbb48d8a4f6 drivers/gpu/drm/nouveau/nvkm/core/object.c Dave Airlie 2024-05-09  33  	unsigned long flags;
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  34  
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  35  	if (handle) {
901dbb48d8a4f6 drivers/gpu/drm/nouveau/nvkm/core/object.c Dave Airlie 2024-05-09  36  		spin_lock_irqsave(&client->obj_lock, flags);
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22 @37  		struct rb_node *node = client->objroot.rb_node;
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  38  		while (node) {
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  39  			object = rb_entry(node, typeof(*object), node);
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  40  			if (handle < object->object)
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  41  				node = node->rb_left;
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  42  			else
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  43  			if (handle > object->object)
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  44  				node = node->rb_right;
901dbb48d8a4f6 drivers/gpu/drm/nouveau/nvkm/core/object.c Dave Airlie 2024-05-09  45  			else {
901dbb48d8a4f6 drivers/gpu/drm/nouveau/nvkm/core/object.c Dave Airlie 2024-05-09  46  				spin_unlock_irqrestore(&client->obj_lock, flags);
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  47  				goto done;
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  48  			}
901dbb48d8a4f6 drivers/gpu/drm/nouveau/nvkm/core/object.c Dave Airlie 2024-05-09  49  		}
901dbb48d8a4f6 drivers/gpu/drm/nouveau/nvkm/core/object.c Dave Airlie 2024-05-09  50  		spin_unlock_irqrestore(&client->obj_lock, flags);
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  51  		return ERR_PTR(-ENOENT);
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  52  	} else {
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  53  		object = &client->object;
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  54  	}
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  55  
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  56  done:
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  57  	if (unlikely(func && object->func != func))
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  58  		return ERR_PTR(-EINVAL);
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  59  	return object;
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  60  }
110cccff955313 drivers/gpu/drm/nouveau/nvkm/core/object.c Ben Skeggs  2016-12-22  61  

:::::: The code at line 37 was first introduced by commit
:::::: 110cccff955313c66dccd2817f62368f106d9bf2 drm/nouveau/core/object: support lookup of specific object types

:::::: TO: Ben Skeggs <bskeggs@redhat.com>
:::::: CC: Ben Skeggs <bskeggs@redhat.com>

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https://github.com/intel/lkp-tests/wiki