linux-kernel - Re: [PATCH v3 6/8] locking/lockdep: Reuse freed chain

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Date:   Fri, 17 Jan 2020 13:51:07 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Waiman Long <longman@...hat.com>
Cc:     kbuild-all@...ts.01.org, Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Will Deacon <will.deacon@....com>,
        linux-kernel@...r.kernel.org, Bart Van Assche <bvanassche@....org>,
        Waiman Long <longman@...hat.com>
Subject: Re: [PATCH v3 6/8] locking/lockdep: Reuse freed chain_hlocks entries

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 linus/master arm-perf/for-next/perf v5.5-rc6 next-20200116]
[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/20200117-093009
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 1a365e822372ba24c9da0822bc583894f6f3d821
config: i386-randconfig-d002-20200117 (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=i386 

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

All errors (new ones prefixed by >>):

   kernel/locking/lockdep.c: In function 'lockdep_init':
>> kernel/locking/lockdep.c:5387:2: error: implicit declaration of function 'init_chain_block_buckets' [-Werror=implicit-function-declaration]
     init_chain_block_buckets();
     ^~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/init_chain_block_buckets +5387 kernel/locking/lockdep.c

  5384	
  5385	void __init lockdep_init(void)
  5386	{
> 5387		init_chain_block_buckets();
  5388	
  5389		printk("Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar\n");
  5390	
  5391		printk("... MAX_LOCKDEP_SUBCLASSES:  %lu\n", MAX_LOCKDEP_SUBCLASSES);
  5392		printk("... MAX_LOCK_DEPTH:          %lu\n", MAX_LOCK_DEPTH);
  5393		printk("... MAX_LOCKDEP_KEYS:        %lu\n", MAX_LOCKDEP_KEYS);
  5394		printk("... CLASSHASH_SIZE:          %lu\n", CLASSHASH_SIZE);
  5395		printk("... MAX_LOCKDEP_ENTRIES:     %lu\n", MAX_LOCKDEP_ENTRIES);
  5396		printk("... MAX_LOCKDEP_CHAINS:      %lu\n", MAX_LOCKDEP_CHAINS);
  5397		printk("... CHAINHASH_SIZE:          %lu\n", CHAINHASH_SIZE);
  5398	
  5399		printk(" memory used by lock dependency info: %zu kB\n",
  5400		       (sizeof(lock_classes) +
  5401			sizeof(lock_classes_in_use) +
  5402			sizeof(classhash_table) +
  5403			sizeof(list_entries) +
  5404			sizeof(list_entries_in_use) +
  5405			sizeof(chainhash_table) +
  5406			sizeof(delayed_free)
  5407	#ifdef CONFIG_PROVE_LOCKING
  5408			+ sizeof(lock_cq)
  5409			+ sizeof(lock_chains)
  5410			+ sizeof(lock_chains_in_use)
  5411			+ sizeof(chain_hlocks)
  5412	#endif
  5413			) / 1024
  5414			);
  5415	

---
0-DAY kernel test infrastructure                 Open Source Technology Center
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation

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