Re: [PATCH v4 5/7] locking/lockdep: Track number of zapped lock chains

[kbuild test robot]

Hi Waiman,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/locking/core]
[also build test ERROR on tip/auto-latest arm-perf/for-next/perf v5.5-rc7 next-20200124]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Waiman-Long/locking-lockdep-Reuse-zapped-chain_hlocks-entries/20200124-085419
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git f5bfdc8e3947a7ae489cf8ae9cfd6b3fb357b952
config: x86_64-randconfig-f003-20200124 (attached as .config)
compiler: gcc-7 (Debian 7.5.0-3) 7.5.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   ld: kernel/locking/lockdep_proc.o: in function `lockdep_stats_show':
>> kernel/locking/lockdep_proc.c:352: undefined reference to `nr_zapped_lock_chains'

vim +352 kernel/locking/lockdep_proc.c

   284	
   285	#ifdef CONFIG_TRACE_IRQFLAGS
   286		seq_printf(m, " in-hardirq chains:             %11u\n",
   287				nr_hardirq_chains);
   288		seq_printf(m, " in-softirq chains:             %11u\n",
   289				nr_softirq_chains);
   290	#endif
   291		seq_printf(m, " in-process chains:             %11u\n",
   292				nr_process_chains);
   293		seq_printf(m, " stack-trace entries:           %11lu [max: %lu]\n",
   294				nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES);
   295	#if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_PROVE_LOCKING)
   296		seq_printf(m, " number of stack traces:        %11llu\n",
   297			   lockdep_stack_trace_count());
   298		seq_printf(m, " number of stack hash chains:   %11llu\n",
   299			   lockdep_stack_hash_count());
   300	#endif
   301		seq_printf(m, " combined max dependencies:     %11u\n",
   302				(nr_hardirq_chains + 1) *
   303				(nr_softirq_chains + 1) *
   304				(nr_process_chains + 1)
   305		);
   306		seq_printf(m, " hardirq-safe locks:            %11lu\n",
   307				nr_hardirq_safe);
   308		seq_printf(m, " hardirq-unsafe locks:          %11lu\n",
   309				nr_hardirq_unsafe);
   310		seq_printf(m, " softirq-safe locks:            %11lu\n",
   311				nr_softirq_safe);
   312		seq_printf(m, " softirq-unsafe locks:          %11lu\n",
   313				nr_softirq_unsafe);
   314		seq_printf(m, " irq-safe locks:                %11lu\n",
   315				nr_irq_safe);
   316		seq_printf(m, " irq-unsafe locks:              %11lu\n",
   317				nr_irq_unsafe);
   318	
   319		seq_printf(m, " hardirq-read-safe locks:       %11lu\n",
   320				nr_hardirq_read_safe);
   321		seq_printf(m, " hardirq-read-unsafe locks:     %11lu\n",
   322				nr_hardirq_read_unsafe);
   323		seq_printf(m, " softirq-read-safe locks:       %11lu\n",
   324				nr_softirq_read_safe);
   325		seq_printf(m, " softirq-read-unsafe locks:     %11lu\n",
   326				nr_softirq_read_unsafe);
   327		seq_printf(m, " irq-read-safe locks:           %11lu\n",
   328				nr_irq_read_safe);
   329		seq_printf(m, " irq-read-unsafe locks:         %11lu\n",
   330				nr_irq_read_unsafe);
   331	
   332		seq_printf(m, " uncategorized locks:           %11lu\n",
   333				nr_uncategorized);
   334		seq_printf(m, " unused locks:                  %11lu\n",
   335				nr_unused);
   336		seq_printf(m, " max locking depth:             %11u\n",
   337				max_lockdep_depth);
   338	#ifdef CONFIG_PROVE_LOCKING
   339		seq_printf(m, " max bfs queue depth:           %11u\n",
   340				max_bfs_queue_depth);
   341	#endif
   342		lockdep_stats_debug_show(m);
   343		seq_printf(m, " debug_locks:                   %11u\n",
   344				debug_locks);
   345	
   346		/*
   347		 * Zappped classes and lockdep data buffers reuse statistics.
   348		 */
   349		seq_puts(m, "\n");
   350		seq_printf(m, " zapped classes:                %11lu\n",
   351				nr_zapped_classes);
 > 352		seq_printf(m, " zapped lock chains:            %11lu\n",
   353				nr_zapped_lock_chains);
   354		return 0;
   355	}
   356	

---
0-DAY kernel test infrastructure                 Open Source Technology Center
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