[linux-next:master 4041/4582] mm/shmem.c:139:24: warning: 'huge_anon_shmem_orders_lock' defined but not used

[linux-next:master 4041/4582] mm/shmem.c:139:24: warning: 'huge_anon_shmem_orders_lock' defined but not used

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   d35b2284e966c0bef3e2182a5c5ea02177dd32e4
commit: f2445d38f2d03a0c27f48b6446eef354f9feb05e [4041/4582] mm: shmem: add multi-size THP sysfs interface for anonymous shmem
config: s390-randconfig-r112-20240228 (https://download.01.org/0day-ci/archive/20240608/202406081136.Uh4wFjpL-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240608/202406081136.Uh4wFjpL-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/202406081136.Uh4wFjpL-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/spinlock.h:89,
                    from include/linux/wait.h:9,
                    from include/linux/wait_bit.h:8,
                    from include/linux/fs.h:6,
                    from mm/shmem.c:24:
>> mm/shmem.c:139:24: warning: 'huge_anon_shmem_orders_lock' defined but not used [-Wunused-variable]
     139 | static DEFINE_SPINLOCK(huge_anon_shmem_orders_lock);
         |                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/spinlock_types.h:43:44: note: in definition of macro 'DEFINE_SPINLOCK'
      43 | #define DEFINE_SPINLOCK(x)      spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
         |                                            ^
   mm/shmem.c:138:22: warning: 'huge_anon_shmem_orders_within_size' defined but not used [-Wunused-variable]
     138 | static unsigned long huge_anon_shmem_orders_within_size __read_mostly;
         |                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   mm/shmem.c:136:22: warning: 'huge_anon_shmem_orders_madvise' defined but not used [-Wunused-variable]
     136 | static unsigned long huge_anon_shmem_orders_madvise __read_mostly;
         |                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   mm/shmem.c:135:22: warning: 'huge_anon_shmem_orders_always' defined but not used [-Wunused-variable]
     135 | static unsigned long huge_anon_shmem_orders_always __read_mostly;
         |                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/huge_anon_shmem_orders_lock +139 mm/shmem.c

   133	
   134	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
   135	static unsigned long huge_anon_shmem_orders_always __read_mostly;
   136	static unsigned long huge_anon_shmem_orders_madvise __read_mostly;
   137	static unsigned long huge_anon_shmem_orders_inherit __read_mostly;
   138	static unsigned long huge_anon_shmem_orders_within_size __read_mostly;
 > 139	static DEFINE_SPINLOCK(huge_anon_shmem_orders_lock);
   140	#endif
   141	

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