linux-kernel - [rcu:rcu/dev 27/27] kernel/rcu/tree_exp.h:461:16: error: implicit declaration of function 'ACCESS_ONCE'; did you mean '__READ

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Date:   Fri, 23 Feb 2018 10:10:16 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org
Subject: [rcu:rcu/dev 27/27] kernel/rcu/tree_exp.h:461:16: error: implicit
 declaration of function 'ACCESS_ONCE'; did you mean '__READ_ONCE'?

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/dev
head:   a57af56830b510f3dae7fa26313058c192f38f94
commit: a57af56830b510f3dae7fa26313058c192f38f94 [27/27] rcu: Parallelize expedited grace-period initialization
config: i386-randconfig-x004-201807 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        git checkout a57af56830b510f3dae7fa26313058c192f38f94
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   In file included from kernel/rcu/tree.c:4205:0:
   kernel/rcu/tree_exp.h: In function 'sync_rcu_exp_select_cpus':
>> kernel/rcu/tree_exp.h:461:16: error: implicit declaration of function 'ACCESS_ONCE'; did you mean '__READ_ONCE'? [-Werror=implicit-function-declaration]
     bool serial = ACCESS_ONCE(rcu_gp_workqueue);
                   ^~~~~~~~~~~
                   __READ_ONCE
   cc1: some warnings being treated as errors

vim +461 kernel/rcu/tree_exp.h

   452	
   453	/*
   454	 * Select the nodes that the upcoming expedited grace period needs
   455	 * to wait for.
   456	 */
   457	static void sync_rcu_exp_select_cpus(struct rcu_state *rsp,
   458					     smp_call_func_t func)
   459	{
   460		struct rcu_node *rnp;
 > 461		bool serial = ACCESS_ONCE(rcu_gp_workqueue);
   462	
   463		trace_rcu_exp_grace_period(rsp->name, rcu_exp_gp_seq_endval(rsp), TPS("reset"));
   464		sync_exp_reset_tree(rsp);
   465		trace_rcu_exp_grace_period(rsp->name, rcu_exp_gp_seq_endval(rsp), TPS("select"));
   466	
   467		/* Schedule work for each leaf rcu_node structure. */
   468		rcu_for_each_leaf_node(rsp, rnp) {
   469			rnp->rew.rew_func = func;
   470			rnp->rew.rew_rsp = rsp;
   471			if (serial) {
   472				func(&rnp->rew.rew_work); /* No workqueues yet. */
   473				continue;
   474			}
   475			INIT_WORK(&rnp->rew.rew_work, sync_rcu_exp_select_node_cpus);
   476			queue_work_on(rnp->grplo, rcu_gp_workqueue, &rnp->rew.rew_work);
   477		}
   478	
   479		/* Wait for workqueue jobs (if any) to complete. */
   480		if (!serial)
   481			rcu_for_each_leaf_node(rsp, rnp)
   482				flush_work(&rnp->rew.rew_work);
   483	}
   484	

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