Re: [PATCH v2 2/2] mm/show_mem: Add trylock while printing alloc info

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

Hi Yueyang,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]

url:    https://github.com/intel-lab-lkp/linux/commits/Yueyang-Pan/mm-show_mem-Dump-the-status-of-the-mem-alloc-profiling-before-printing/20250903-000616
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/1491df0ac12a7626b7c9b00e26a6e10adb8c9045.1756827906.git.pyyjason%40gmail.com
patch subject: [PATCH v2 2/2] mm/show_mem: Add trylock while printing alloc info
config: i386-buildonly-randconfig-001-20250903 (https://download.01.org/0day-ci/archive/20250903/202509031744.HcibSETe-lkp@intel.com/config)
compiler: gcc-13 (Debian 13.3.0-16) 13.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250903/202509031744.HcibSETe-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/202509031744.HcibSETe-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from mm/show_mem.c:18:
   mm/show_mem.c: In function 'show_free_areas':
   mm/show_mem.c:336:49: error: 'NR_ZSPAGES' undeclared (first use in this function); did you mean 'NR_STATS'?
     336 |                         K(zone_page_state(zone, NR_ZSPAGES)),
         |                                                 ^~~~~~~~~~
   mm/internal.h:560:16: note: in definition of macro 'K'
     560 | #define K(x) ((x) << (PAGE_SHIFT-10))
         |                ^
   include/linux/printk.h:512:26: note: in expansion of macro 'printk_index_wrap'
     512 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
         |                          ^~~~~~~~~~~~~~~~~
   mm/show_mem.c:298:17: note: in expansion of macro 'printk'
     298 |                 printk(KERN_CONT
         |                 ^~~~~~
   mm/show_mem.c:336:49: note: each undeclared identifier is reported only once for each function it appears in
     336 |                         K(zone_page_state(zone, NR_ZSPAGES)),
         |                                                 ^~~~~~~~~~
   mm/internal.h:560:16: note: in definition of macro 'K'
     560 | #define K(x) ((x) << (PAGE_SHIFT-10))
         |                ^
   include/linux/printk.h:512:26: note: in expansion of macro 'printk_index_wrap'
     512 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
         |                          ^~~~~~~~~~~~~~~~~
   mm/show_mem.c:298:17: note: in expansion of macro 'printk'
     298 |                 printk(KERN_CONT
         |                 ^~~~~~
   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:7,
                    from include/linux/highmem.h:5,
                    from include/linux/bvec.h:10,
                    from include/linux/blk_types.h:10,
                    from include/linux/blkdev.h:9,
                    from mm/show_mem.c:8:
   mm/show_mem.c: In function '__show_mem':
>> mm/show_mem.c:399:32: warning: unused variable 'mem_alloc_profiling_spinlock' [-Wunused-variable]
     399 |         static DEFINE_SPINLOCK(mem_alloc_profiling_spinlock);
         |                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   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 +/mem_alloc_profiling_spinlock +399 mm/show_mem.c

   396	
   397	void __show_mem(unsigned int filter, nodemask_t *nodemask, int max_zone_idx)
   398	{
 > 399		static DEFINE_SPINLOCK(mem_alloc_profiling_spinlock);

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