[jimc:dd-shrink-cached 61/64] lib/dynamic_debug.c:2166:13: warning: 'ddebug_drop_all_cached_prefixes' defined but not used

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

tree:   https://github.com/jimc/linux.git dd-shrink-cached
head:   917ff2e5a74ae1c252ad3a2c9017bd464f9258f9
commit: 2ac93b95f70330b9b6a6e2ff609691c85fa7ceed [61/64] lib/dynamic_debug.c: Cache shared dynamic prefixes eagerly
config: sh-randconfig-r133-20260819 (https://download.01.org/0day-ci/archive/20260819/202608191321.ayWRylKz-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 16.1.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260819/202608191321.ayWRylKz-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/202608191321.ayWRylKz-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> lib/dynamic_debug.c:2166:13: warning: 'ddebug_drop_all_cached_prefixes' defined but not used [-Wunused-function]
    2166 | static void ddebug_drop_all_cached_prefixes(const struct _ddebug_info *di)
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/ddebug_drop_all_cached_prefixes +2166 lib/dynamic_debug.c

  2165	
> 2166	static void ddebug_drop_all_cached_prefixes(const struct _ddebug_info *di)
  2167	{
  2168		int i, f;
  2169		struct _ddebug *dp;
  2170	
  2171		for_subvec(i, dp, di, descs) {
  2172			for (f = 0; f < 16; f++) {
  2173				unsigned long key = ((unsigned long)f << DDEBUG_PREFIX_KEY_FLAGS_SHIFT) |
  2174						    ((unsigned long)dp >> 4);
  2175				char *prefix = mtree_erase(&pr_prefixes, key);
  2176				if (prefix) {
  2177					pr_prefixes_count--;
  2178					v3pr_info("drop cached prefix: %s\n", prefix);
  2179					kfree(prefix);
  2180				}
  2181			}
  2182		}
  2183	}
  2184	

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