drivers/parisc/sba_iommu.c:124:31: warning: 'proc_runway_root' defined but not used

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d68b4b6f307d155475cce541f2aee938032ed22e
commit: 77e0ddf097d6d4ceaf898e088b133b99e0a97fa0 parisc: ccio-dma: Create private runway procfs root entry
date:   33 hours ago
config: parisc-randconfig-r035-20230830 (https://download.01.org/0day-ci/archive/20230830/202308300800.Jod4sHzM-lkp@xxxxxxxxx/config)
compiler: hppa-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230830/202308300800.Jod4sHzM-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308300800.Jod4sHzM-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> drivers/parisc/sba_iommu.c:124:31: warning: 'proc_runway_root' defined but not used [-Wunused-variable]
     124 | static struct proc_dir_entry *proc_runway_root __ro_after_init;
         |                               ^~~~~~~~~~~~~~~~


vim +/proc_runway_root +124 drivers/parisc/sba_iommu.c

   123	
 > 124	static struct proc_dir_entry *proc_runway_root __ro_after_init;
   125	struct proc_dir_entry *proc_mckinley_root __ro_after_init;
   126	

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