linux-kernel - [ammarfaizi2-block:paulmck/linux-rcu/dev 83/131] kernel/rcu/tree.c:3778:13: error: implicit declaration of function 'preempt_mode_full'; did you mean 'preempt_model

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Date:   Tue, 12 Apr 2022 02:44:09 +0800
From:   kernel test robot <lkp@...el.com>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     kbuild-all@...ts.01.org,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org,
        "Paul E. McKenney" <paulmck@...nel.org>
Subject: [ammarfaizi2-block:paulmck/linux-rcu/dev 83/131]
 kernel/rcu/tree.c:3778:13: error: implicit declaration of function
 'preempt_mode_full'; did you mean 'preempt_model_full'?

tree:   https://github.com/ammarfaizi2/linux-block paulmck/linux-rcu/dev
head:   96d35f716a63bc46750d66a5daec804997ff7cc6
commit: 78b49c815a11d5541a7492b483eb20ec6377cafe [83/131] rcu: Fix preemption mode check on synchronize_rcu[_expedited]()
config: xtensa-buildonly-randconfig-r003-20220411 (https://download.01.org/0day-ci/archive/20220412/202204120207.7OoY1hZZ-lkp@intel.com/config)
compiler: xtensa-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/ammarfaizi2/linux-block/commit/78b49c815a11d5541a7492b483eb20ec6377cafe
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block paulmck/linux-rcu/dev
        git checkout 78b49c815a11d5541a7492b483eb20ec6377cafe
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=xtensa SHELL=/bin/bash

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

Note: the ammarfaizi2-block/paulmck/linux-rcu/dev HEAD 96d35f716a63bc46750d66a5daec804997ff7cc6 builds fine.
      It only hurts bisectability.

All errors (new ones prefixed by >>):

   kernel/rcu/tree.c: In function 'rcu_blocking_is_gp':
>> kernel/rcu/tree.c:3778:13: error: implicit declaration of function 'preempt_mode_full'; did you mean 'preempt_model_full'? [-Werror=implicit-function-declaration]
    3778 |         if (preempt_mode_full() || preempt_mode_rt())
         |             ^~~~~~~~~~~~~~~~~
         |             preempt_model_full
>> kernel/rcu/tree.c:3778:36: error: implicit declaration of function 'preempt_mode_rt'; did you mean 'preempt_model_rt'? [-Werror=implicit-function-declaration]
    3778 |         if (preempt_mode_full() || preempt_mode_rt())
         |                                    ^~~~~~~~~~~~~~~
         |                                    preempt_model_rt
   cc1: some warnings being treated as errors


vim +3778 kernel/rcu/tree.c

  3761	
  3762	/*
  3763	 * During early boot, any blocking grace-period wait automatically
  3764	 * implies a grace period.  Later on, this is never the case for PREEMPTION.
  3765	 *
  3766	 * However, because a context switch is a grace period for !PREEMPTION, any
  3767	 * blocking grace-period wait automatically implies a grace period if
  3768	 * there is only one CPU online at any point time during execution of
  3769	 * either synchronize_rcu() or synchronize_rcu_expedited().  It is OK to
  3770	 * occasionally incorrectly indicate that there are multiple CPUs online
  3771	 * when there was in fact only one the whole time, as this just adds some
  3772	 * overhead: RCU still operates correctly.
  3773	 */
  3774	static int rcu_blocking_is_gp(void)
  3775	{
  3776		int ret;
  3777	
> 3778		if (preempt_mode_full() || preempt_mode_rt())
  3779			return rcu_scheduler_active == RCU_SCHEDULER_INACTIVE;
  3780		might_sleep();  /* Check for RCU read-side critical section. */
  3781		preempt_disable();
  3782		/*
  3783		 * If the rcu_state.n_online_cpus counter is equal to one,
  3784		 * there is only one CPU, and that CPU sees all prior accesses
  3785		 * made by any CPU that was online at the time of its access.
  3786		 * Furthermore, if this counter is equal to one, its value cannot
  3787		 * change until after the preempt_enable() below.
  3788		 *
  3789		 * Furthermore, if rcu_state.n_online_cpus is equal to one here,
  3790		 * all later CPUs (both this one and any that come online later
  3791		 * on) are guaranteed to see all accesses prior to this point
  3792		 * in the code, without the need for additional memory barriers.
  3793		 * Those memory barriers are provided by CPU-hotplug code.
  3794		 */
  3795		ret = READ_ONCE(rcu_state.n_online_cpus) <= 1;
  3796		preempt_enable();
  3797		return ret;
  3798	}
  3799	

-- 
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