linux-kernel - Re: [PATCH RT] rt: convert mm/kasan/quarantine_lock to raw

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Message-ID: <201809190442.itGUBZK3%fengguang.wu@intel.com>
Date:   Wed, 19 Sep 2018 04:34:50 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Clark Williams <williams@...hat.com>
Cc:     kbuild-all@...org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: [PATCH RT] rt: convert mm/kasan/quarantine_lock to raw_spinlock

Hi Clark,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linux-rt-devel/for-kbuild-bot/current-stable]

url:    https://github.com/0day-ci/linux/commits/Clark-Williams/rt-convert-mm-kasan-quarantine_lock-to-raw_spinlock/20180919-021343
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git for-kbuild-bot/current-stable
config: x86_64-allmodconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   include/uapi/linux/perf_event.h:147:56: warning: cast truncates bits from constant value (8000000000000000 becomes 0)
   kernel/rcu/tree.c:216:15: warning: symbol 'rcu_rnp_online_cpus' was not declared. Should it be static?
   kernel/rcu/tree.c:366:6: warning: symbol 'rcu_dynticks_curr_cpu_in_eqs' was not declared. Should it be static?
>> kernel/rcu/tree.c:2930:36: warning: incorrect type in initializer (different address spaces)
   kernel/rcu/tree.c:2930:36:    expected struct task_struct [noderef] <asn:3>**store
   kernel/rcu/tree.c:2930:36:    got struct task_struct *[noderef] <asn:3>*<noident>
   kernel/rcu/tree.c:3978:21: warning: incorrect type in argument 1 (different modifiers)
   kernel/rcu/tree.c:3978:21:    expected int ( *threadfn )( ... )
   kernel/rcu/tree.c:3978:21:    got int ( [noreturn] *<noident> )( ... )
   kernel/rcu/tree.c:1680:13: warning: context imbalance in 'rcu_start_this_gp' - different lock contexts for basic block
   kernel/rcu/tree.c:2703:9: warning: context imbalance in 'force_qs_rnp' - different lock contexts for basic block
   kernel/rcu/tree.c:2766:25: warning: context imbalance in 'force_quiescent_state' - unexpected unlock
   kernel/rcu/tree_exp.h:203:9: warning: context imbalance in '__rcu_report_exp_rnp' - different lock contexts for basic block

vim +2930 kernel/rcu/tree.c

385c3906 Paul E. McKenney 2013-11-04  2928  
385c3906 Paul E. McKenney 2013-11-04  2929  static struct smp_hotplug_thread rcu_cpu_thread_spec = {
385c3906 Paul E. McKenney 2013-11-04 @2930  	.store			= &rcu_cpu_kthread_task,
385c3906 Paul E. McKenney 2013-11-04  2931  	.thread_should_run	= rcu_cpu_kthread_should_run,
385c3906 Paul E. McKenney 2013-11-04  2932  	.thread_fn		= rcu_cpu_kthread,
385c3906 Paul E. McKenney 2013-11-04  2933  	.thread_comm		= "rcuc/%u",
385c3906 Paul E. McKenney 2013-11-04  2934  	.setup			= rcu_cpu_kthread_setup,
385c3906 Paul E. McKenney 2013-11-04  2935  	.park			= rcu_cpu_kthread_park,
385c3906 Paul E. McKenney 2013-11-04  2936  };
385c3906 Paul E. McKenney 2013-11-04  2937  

:::::: The code at line 2930 was first introduced by commit
:::::: 385c3906e2a7db036cd3185d1a2f38c842664ce0 rcu: Eliminate softirq processing from rcutree

:::::: TO: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
:::::: CC: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

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