[akpm-mm:mm-unstable 263/270] mm/memory-tiers.c:769:13: warning: variable 'rc' set but not used

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
head:   0cef2c0a2a356137b170c3cb46cb9c1dd2ca3e6b
commit: fbc8b54896eef0b4d9aaa793523867c7eb86e788 [263/270] memory tier: create CPUless memory tiers after obtaining HMAT info
config: x86_64-defconfig (https://download.01.org/0day-ci/archive/20240331/202403311826.SNOu8jAt-lkp@intel.com/config)
compiler: gcc-11 (Ubuntu 11.4.0-4ubuntu1) 11.4.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240331/202403311826.SNOu8jAt-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/202403311826.SNOu8jAt-lkp@intel.com/

All warnings (new ones prefixed by >>):

   mm/memory-tiers.c: In function 'mt_perf_to_adistance':
>> mm/memory-tiers.c:769:13: warning: variable 'rc' set but not used [-Wunused-but-set-variable]
     769 |         int rc = 0;
         |             ^~


vim +/rc +769 mm/memory-tiers.c

   766	
   767	int mt_perf_to_adistance(struct access_coordinate *perf, int *adist)
   768	{
 > 769		int rc = 0;
   770	
   771		mutex_lock(&default_dram_perf_lock);
   772		if (default_dram_perf_error) {
   773			rc = -EIO;
   774			goto out;
   775		}
   776	
   777		if (perf->read_latency + perf->write_latency == 0 ||
   778		    perf->read_bandwidth + perf->write_bandwidth == 0) {
   779			rc = -EINVAL;
   780			goto out;
   781		}
   782	
   783		if (default_dram_perf_ref_nid == NUMA_NO_NODE) {
   784			rc = -ENOENT;
   785			goto out;
   786		}
   787		/*
   788		 * The abstract distance of a memory node is in direct proportion to
   789		 * its memory latency (read + write) and inversely proportional to its
   790		 * memory bandwidth (read + write).  The abstract distance, memory
   791		 * latency, and memory bandwidth of the default DRAM nodes are used as
   792		 * the base.
   793		 */
   794		*adist = MEMTIER_ADISTANCE_DRAM *
   795			(perf->read_latency + perf->write_latency) /
   796			(default_dram_perf.read_latency + default_dram_perf.write_latency) *
   797			(default_dram_perf.read_bandwidth + default_dram_perf.write_bandwidth) /
   798			(perf->read_bandwidth + perf->write_bandwidth);
   799	
   800	out:
   801		mutex_unlock(&default_dram_perf_lock);
   802		return 0;
   803	}
   804	EXPORT_SYMBOL_GPL(mt_perf_to_adistance);
   805	

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