linux-kernel - Re: [PATCH 2/2] lockdep: warn on redundant or incorrect irq state changes

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Date:   Fri, 24 Jul 2020 10:57:34 +0800
From:   kernel test robot <lkp@...el.com>
To:     Nicholas Piggin <npiggin@...il.com>, linux-kernel@...r.kernel.org
Cc:     kbuild-all@...ts.01.org, Nicholas Piggin <npiggin@...il.com>,
        linux-arch@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Alexey Kardashevskiy <aik@...abs.ru>
Subject: Re: [PATCH 2/2] lockdep: warn on redundant or incorrect irq state
 changes

Hi Nicholas,

I love your patch! Yet something to improve:

[auto build test ERROR on linux/master]
[also build test ERROR on powerpc/next linus/master v5.8-rc6]
[cannot apply to tip/locking/core next-20200723]
[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]

url:    https://github.com/0day-ci/linux/commits/Nicholas-Piggin/lockdep-improve-current-hard-soft-irqs_enabled-synchronisation-with-actual-irq-state/20200723-185938
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 9ebcfadb0610322ac537dd7aa5d9cbc2b2894c68
config: x86_64-randconfig-a002-20200723 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-14) 9.3.0
reproduce (this is a W=1 build):
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

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

All errors (new ones prefixed by >>):

   kernel/locking/lockdep.c: In function 'lockdep_init':
>> kernel/locking/lockdep.c:5673:9: error: 'struct task_struct' has no member named 'hardirqs_enabled'
    5673 |  current->hardirqs_enabled = 1;
         |         ^~
>> kernel/locking/lockdep.c:5674:9: error: 'struct task_struct' has no member named 'softirqs_enabled'
    5674 |  current->softirqs_enabled = 1;
         |         ^~
   In file included from kernel/locking/lockdep.c:60:
   At top level:
   kernel/locking/lockdep_internals.h:64:28: warning: 'LOCKF_USED_IN_IRQ_READ' defined but not used [-Wunused-const-variable=]
      64 | static const unsigned long LOCKF_USED_IN_IRQ_READ =
         |                            ^~~~~~~~~~~~~~~~~~~~~~
   In file included from kernel/locking/lockdep.c:60:
   kernel/locking/lockdep_internals.h:58:28: warning: 'LOCKF_ENABLED_IRQ_READ' defined but not used [-Wunused-const-variable=]
      58 | static const unsigned long LOCKF_ENABLED_IRQ_READ =
         |                            ^~~~~~~~~~~~~~~~~~~~~~
   In file included from kernel/locking/lockdep.c:60:
   kernel/locking/lockdep_internals.h:52:28: warning: 'LOCKF_USED_IN_IRQ' defined but not used [-Wunused-const-variable=]
      52 | static const unsigned long LOCKF_USED_IN_IRQ =
         |                            ^~~~~~~~~~~~~~~~~
   In file included from kernel/locking/lockdep.c:60:
   kernel/locking/lockdep_internals.h:46:28: warning: 'LOCKF_ENABLED_IRQ' defined but not used [-Wunused-const-variable=]
      46 | static const unsigned long LOCKF_ENABLED_IRQ =
         |                            ^~~~~~~~~~~~~~~~~

vim +5673 kernel/locking/lockdep.c

  5667	
  5668		printk(" per task-struct memory footprint: %zu bytes\n",
  5669		       sizeof(((struct task_struct *)NULL)->held_locks));
  5670	
  5671		WARN_ON(irqs_disabled());
  5672	
> 5673		current->hardirqs_enabled = 1;
> 5674		current->softirqs_enabled = 1;
  5675	}
  5676	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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