[linux-next:master 6443/6992] mm/huge_memory.c:80:24: warning: 'huge_anon_orders_lock' defined but not used

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   bbd220ce4e29ed55ab079007cff0b550895258eb
commit: b197f32bc3d3d9f60977f31ad3e9eadb2123ca60 [6443/6992] mm: thp: introduce multi-size THP sysfs interface
config: s390-randconfig-r006-20230501 (https://download.01.org/0day-ci/archive/20231211/202312111916.YbsHxKPq-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/20231211/202312111916.YbsHxKPq-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/202312111916.YbsHxKPq-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/spinlock.h:89,
                    from include/linux/mmzone.h:8,
                    from include/linux/gfp.h:7,
                    from include/linux/mm.h:7,
                    from mm/huge_memory.c:8:
>> mm/huge_memory.c:80:24: warning: 'huge_anon_orders_lock' defined but not used [-Wunused-variable]
      80 | static DEFINE_SPINLOCK(huge_anon_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)
         |                                            ^


vim +/huge_anon_orders_lock +80 mm/huge_memory.c

    48	
    49	/*
    50	 * By default, transparent hugepage support is disabled in order to avoid
    51	 * risking an increased memory footprint for applications that are not
    52	 * guaranteed to benefit from it. When transparent hugepage support is
    53	 * enabled, it is for all mappings, and khugepaged scans all mappings.
    54	 * Defrag is invoked by khugepaged hugepage allocations and by page faults
    55	 * for all hugepage allocations.
    56	 */
    57	unsigned long transparent_hugepage_flags __read_mostly =
    58	#ifdef CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS
    59		(1<<TRANSPARENT_HUGEPAGE_FLAG)|
    60	#endif
    61	#ifdef CONFIG_TRANSPARENT_HUGEPAGE_MADVISE
    62		(1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)|
    63	#endif
    64		(1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG)|
    65		(1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG)|
    66		(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG);
    67	
    68	static struct shrinker *deferred_split_shrinker;
    69	static unsigned long deferred_split_count(struct shrinker *shrink,
    70						  struct shrink_control *sc);
    71	static unsigned long deferred_split_scan(struct shrinker *shrink,
    72						 struct shrink_control *sc);
    73	
    74	static atomic_t huge_zero_refcount;
    75	struct page *huge_zero_page __read_mostly;
    76	unsigned long huge_zero_pfn __read_mostly = ~0UL;
    77	unsigned long huge_anon_orders_always __read_mostly;
    78	unsigned long huge_anon_orders_madvise __read_mostly;
    79	unsigned long huge_anon_orders_inherit __read_mostly;
  > 80	static DEFINE_SPINLOCK(huge_anon_orders_lock);
    81	

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