linux-kernel - [frederic-dynticks:isolation/split 9/13] kernel/rcu/rcutorture.c:1718:49: sparse: sparse: incorrect type in argument 1 (different modifiers)

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Date:   Wed, 10 Nov 2021 12:03:54 +0800
From:   kernel test robot <lkp@...el.com>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [frederic-dynticks:isolation/split 9/13]
 kernel/rcu/rcutorture.c:1718:49: sparse: sparse: incorrect type in argument
 1 (different modifiers)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git isolation/split
head:   c4988a7256e9e02fb2503a7a0e748ab7b50667b6
commit: 8ea31dca120d4d746a70867c26ca97bb9f4b0471 [9/13] rcu/nocb: Pass a cpumask instead of a single CPU to offload/deoffload
config: i386-randconfig-s001-20211027 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git/commit/?id=8ea31dca120d4d746a70867c26ca97bb9f4b0471
        git remote add frederic-dynticks https://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
        git fetch --no-tags frederic-dynticks isolation/split
        git checkout 8ea31dca120d4d746a70867c26ca97bb9f4b0471
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 

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


sparse warnings: (new ones prefixed by >>)
   kernel/rcu/rcutorture.c:563:1: sparse: sparse: symbol '__srcu_struct_srcu_ctl' was not declared. Should it be static?
>> kernel/rcu/rcutorture.c:1718:49: sparse: sparse: incorrect type in argument 1 (different modifiers) @@     expected struct cpumask *cpumask @@     got struct cpumask const * @@
   kernel/rcu/rcutorture.c:1718:49: sparse:     expected struct cpumask *cpumask
   kernel/rcu/rcutorture.c:1718:49: sparse:     got struct cpumask const *
   kernel/rcu/rcutorture.c:1721:49: sparse: sparse: incorrect type in argument 1 (different modifiers) @@     expected struct cpumask *cpumask @@     got struct cpumask const * @@
   kernel/rcu/rcutorture.c:1721:49: sparse:     expected struct cpumask *cpumask
   kernel/rcu/rcutorture.c:1721:49: sparse:     got struct cpumask const *
   kernel/rcu/rcutorture.c:785:12: sparse: sparse: context imbalance in 'rcu_torture_read_lock_trivial' - wrong count at exit
   kernel/rcu/rcutorture.c:793:9: sparse: sparse: context imbalance in 'rcu_torture_read_unlock_trivial' - wrong count at exit
   kernel/rcu/rcutorture.c:1468:9: sparse: sparse: context imbalance in 'rcutorture_one_extend' - different lock contexts for basic block

vim +1718 kernel/rcu/rcutorture.c

  1686	
  1687	/*
  1688	 * Randomly Toggle CPUs' callback-offload state.  This uses hrtimers to
  1689	 * increase race probabilities and fuzzes the interval between toggling.
  1690	 */
  1691	static int rcu_nocb_toggle(void *arg)
  1692	{
  1693		int cpu;
  1694		int maxcpu = -1;
  1695		int oldnice = task_nice(current);
  1696		long r;
  1697		DEFINE_TORTURE_RANDOM(rand);
  1698		ktime_t toggle_delay;
  1699		unsigned long toggle_fuzz;
  1700		ktime_t toggle_interval = ms_to_ktime(nocbs_toggle);
  1701	
  1702		VERBOSE_TOROUT_STRING("rcu_nocb_toggle task started");
  1703		while (!rcu_inkernel_boot_has_ended())
  1704			schedule_timeout_interruptible(HZ / 10);
  1705		for_each_online_cpu(cpu)
  1706			maxcpu = cpu;
  1707		WARN_ON(maxcpu < 0);
  1708		if (toggle_interval > ULONG_MAX)
  1709			toggle_fuzz = ULONG_MAX >> 3;
  1710		else
  1711			toggle_fuzz = toggle_interval >> 3;
  1712		if (toggle_fuzz <= 0)
  1713			toggle_fuzz = NSEC_PER_USEC;
  1714		do {
  1715			r = torture_random(&rand);
  1716			cpu = (r >> 4) % (maxcpu + 1);
  1717			if (r & 0x1) {
> 1718				rcu_nocb_cpumask_update(cpumask_of(cpu), true);
  1719				atomic_long_inc(&n_nocb_offload);
  1720			} else {
  1721				rcu_nocb_cpumask_update(cpumask_of(cpu), false);
  1722				atomic_long_inc(&n_nocb_deoffload);
  1723			}
  1724			toggle_delay = torture_random(&rand) % toggle_fuzz + toggle_interval;
  1725			set_current_state(TASK_INTERRUPTIBLE);
  1726			schedule_hrtimeout(&toggle_delay, HRTIMER_MODE_REL);
  1727			if (stutter_wait("rcu_nocb_toggle"))
  1728				sched_set_normal(current, oldnice);
  1729		} while (!torture_must_stop());
  1730		torture_kthread_stopping("rcu_nocb_toggle");
  1731		return 0;
  1732	}
  1733	

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

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