linux-kernel - Re: [PATCH] lockdep: add lockdep_cleanup_dead

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Date:   Sun, 29 Oct 2023 01:14:58 +0800
From:   kernel test robot <lkp@...el.com>
To:     David Woodhouse <dwmw2@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Cc:     oe-kbuild-all@...ts.linux.dev, Juergen Gross <jgross@...e.com>
Subject: Re: [PATCH] lockdep: add lockdep_cleanup_dead_cpu()

Hi David,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/smp/core]
[also build test WARNING on tip/locking/core linus/master v6.6-rc7 next-20231027]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/David-Woodhouse/lockdep-add-lockdep_cleanup_dead_cpu/20231028-191538
base:   tip/smp/core
patch link:    https://lore.kernel.org/r/e5ba02138c31da60daf91ce505ac3860d022332b.camel%40infradead.org
patch subject: [PATCH] lockdep: add lockdep_cleanup_dead_cpu()
config: powerpc-allyesconfig (https://download.01.org/0day-ci/archive/20231029/202310290041.L5ndwcQ9-lkp@intel.com/config)
compiler: powerpc64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231029/202310290041.L5ndwcQ9-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202310290041.L5ndwcQ9-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/locking/lockdep.c:4557: warning: Function parameter or member 'cpu' not described in 'lockdep_cleanup_dead_cpu'
>> kernel/locking/lockdep.c:4557: warning: Function parameter or member 'idle' not described in 'lockdep_cleanup_dead_cpu'


vim +4557 kernel/locking/lockdep.c

  4548	
  4549	/**
  4550	 * lockdep_cleanup_dead_cpu - Ensure CPU lockdep state is cleanly stopped
  4551	 *
  4552	 * Invoked after the CPU is dead. Ensures that the tracing infrastructure
  4553	 * is left in a suitable state for the CPU to be subsequently brought
  4554	 * online again.
  4555	 */
  4556	void lockdep_cleanup_dead_cpu(unsigned int cpu, struct task_struct *idle)
> 4557	{
  4558		if (unlikely(!debug_locks))
  4559			return;
  4560	
  4561		if (unlikely(per_cpu(hardirqs_enabled, cpu))) {
  4562			pr_warn("CPU %u left hardirqs enabled!", cpu);
  4563			if (idle)
  4564				print_irqtrace_events(idle);
  4565			/* Clean it up for when the CPU comes online again. */
  4566			per_cpu(hardirqs_enabled, cpu) = 0;
  4567		}
  4568	}
  4569	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki