mm/zswap.c:58:12: warning: variable 'zswap_pool_limit_hit' set but not used

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   fe2ec83746e501645709761605c2464a44fd2929
commit: f5caeb3689ea2d8a8c0790d9eea68b63e8f15496 xfs: XFS_ONLINE_SCRUB_STATS should depend on DEBUG_FS
date:   11 months ago
config: sparc64-randconfig-r2107-20260923 (https://download.01.org/0day-ci/archive/20260923/202609230402.t5SIdVPp-lkp@intel.com/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 4b99afb361a8cfd45fc17aebc637688661e9e472)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260923/202609230402.t5SIdVPp-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
| Fixes: f5caeb3689ea ("xfs: XFS_ONLINE_SCRUB_STATS should depend on DEBUG_FS")
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202609230402.t5SIdVPp-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/zswap.c:58:12: warning: variable 'zswap_pool_limit_hit' set but not used [-Wunused-but-set-global]
      58 | static u64 zswap_pool_limit_hit;
         |            ^
>> mm/zswap.c:60:12: warning: variable 'zswap_written_back_pages' set but not used [-Wunused-but-set-global]
      60 | static u64 zswap_written_back_pages;
         |            ^
>> mm/zswap.c:62:12: warning: variable 'zswap_reject_reclaim_fail' set but not used [-Wunused-but-set-global]
      62 | static u64 zswap_reject_reclaim_fail;
         |            ^
>> mm/zswap.c:64:12: warning: variable 'zswap_reject_compress_fail' set but not used [-Wunused-but-set-global]
      64 | static u64 zswap_reject_compress_fail;
         |            ^
>> mm/zswap.c:66:12: warning: variable 'zswap_reject_compress_poor' set but not used [-Wunused-but-set-global]
      66 | static u64 zswap_reject_compress_poor;
         |            ^
>> mm/zswap.c:68:12: warning: variable 'zswap_decompress_fail' set but not used [-Wunused-but-set-global]
      68 | static u64 zswap_decompress_fail;
         |            ^
>> mm/zswap.c:70:12: warning: variable 'zswap_reject_alloc_fail' set but not used [-Wunused-but-set-global]
      70 | static u64 zswap_reject_alloc_fail;
         |            ^
>> mm/zswap.c:72:12: warning: variable 'zswap_reject_kmemcache_fail' set but not used [-Wunused-but-set-global]
      72 | static u64 zswap_reject_kmemcache_fail;
         |            ^
   8 warnings generated.


vim +/zswap_pool_limit_hit +58 mm/zswap.c

2b2811178e8555 Seth Jennings 2013-07-10  56  
2b2811178e8555 Seth Jennings 2013-07-10  57  /* Pool limit was hit (see zswap_max_pool_percent) */
2b2811178e8555 Seth Jennings 2013-07-10 @58  static u64 zswap_pool_limit_hit;
2b2811178e8555 Seth Jennings 2013-07-10  59  /* Pages written back when pool limit was reached */
2b2811178e8555 Seth Jennings 2013-07-10 @60  static u64 zswap_written_back_pages;
2b2811178e8555 Seth Jennings 2013-07-10  61  /* Store failed due to a reclaim failure after pool limit was reached */
2b2811178e8555 Seth Jennings 2013-07-10 @62  static u64 zswap_reject_reclaim_fail;
cb61dad80fdc6a Nhat Pham     2023-10-24  63  /* Store failed due to compression algorithm failure */
cb61dad80fdc6a Nhat Pham     2023-10-24 @64  static u64 zswap_reject_compress_fail;
2b2811178e8555 Seth Jennings 2013-07-10  65  /* Compressed page was too big for the allocator to (optimally) store */
2b2811178e8555 Seth Jennings 2013-07-10 @66  static u64 zswap_reject_compress_poor;
ff22f9299d7b2c Nhat Pham     2025-03-06  67  /* Load or writeback failed due to decompression failure */
ff22f9299d7b2c Nhat Pham     2025-03-06 @68  static u64 zswap_decompress_fail;
2b2811178e8555 Seth Jennings 2013-07-10  69  /* Store failed because underlying allocator could not get memory */
2b2811178e8555 Seth Jennings 2013-07-10 @70  static u64 zswap_reject_alloc_fail;
2b2811178e8555 Seth Jennings 2013-07-10  71  /* Store failed because the entry metadata could not be allocated (rare) */
2b2811178e8555 Seth Jennings 2013-07-10 @72  static u64 zswap_reject_kmemcache_fail;
2b2811178e8555 Seth Jennings 2013-07-10  73  

:::::: The code at line 58 was first introduced by commit
:::::: 2b2811178e85553405b86e3fe78357b9b95889ce zswap: add to mm/

:::::: TO: Seth Jennings <sjenning@linux.vnet.ibm.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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