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Commit 115f7a7c authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcu: Apply for_each_rcu_flavor() to increment_cpu_stall_ticks() 



The increment_cpu_stall_ticks() function listed each RCU flavor
explicitly, with an ifdef to handle preemptible RCU.  This commit
therefore applies for_each_rcu_flavor() to save a line of code.

Because this commit switches from a code-based enumeration of the
flavors of RCU to an rcu_state-list-based enumeration, it is no longer
possible to apply __get_cpu_var() to the per-CPU rcu_data structures.
We instead use __this_cpu_var() on the rcu_state structure's ->rda field
that references the corresponding rcu_data structures.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent b065a853

kernel/rcutree_plugin.h

+4 −5
Original line number Diff line number Diff line
@@ -2200,11 +2200,10 @@ static void zero_cpu_stall_ticks(struct rcu_data *rdp) 
/* Increment ->ticks_this_gp for all flavors of RCU. */

static void increment_cpu_stall_ticks(void)

{

	__get_cpu_var(rcu_sched_data).ticks_this_gp++;

	__get_cpu_var(rcu_bh_data).ticks_this_gp++;

#ifdef CONFIG_TREE_PREEMPT_RCU

	__get_cpu_var(rcu_preempt_data).ticks_this_gp++;

#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */

	struct rcu_state *rsp;



	for_each_rcu_flavor(rsp)

		__this_cpu_ptr(rsp->rda)->ticks_this_gp++;

}



#else /* #ifdef CONFIG_RCU_CPU_STALL_INFO */