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rcu: Remove rsp parameter from __rcu_process_callbacks() 

There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions.  This commit therefore removes the rsp parameter from
__rcu_process_callbacks(), and also inlines it into rcu_process_callbacks(),
removing the for_each_rcu_flavor() while in the neighborhood.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2018-07-03 17:22:34 -07:00
parent b96f9dc4fb
commit b049fdf8e3
1 changed files with 7 additions and 19 deletions
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26
kernel/rcu/tree.c
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@ -2741,17 +2741,19 @@ rcu_check_gp_start_stall(struct rcu_node *rnp, struct rcu_data *rdp)
} }
/* /*
* This does the RCU core processing work for the specified rcu_state * This does the RCU core processing work for the specified rcu_data
* and rcu_data structures. This may be called only from the CPU to * structures. This may be called only from the CPU to whom the rdp
* whom the rdp belongs. * belongs.
*/ */
static void static __latent_entropy void rcu_process_callbacks(struct softirq_action *unused)
__rcu_process_callbacks(struct rcu_state *rsp)
{ {
unsigned long flags; unsigned long flags;
struct rcu_data *rdp = raw_cpu_ptr(&rcu_data); struct rcu_data *rdp = raw_cpu_ptr(&rcu_data);
struct rcu_node *rnp = rdp->mynode; struct rcu_node *rnp = rdp->mynode;
if (cpu_is_offline(smp_processor_id()))
return;
trace_rcu_utilization(TPS("Start RCU core"));
WARN_ON_ONCE(!rdp->beenonline); WARN_ON_ONCE(!rdp->beenonline);
/* Report any deferred quiescent states if preemption enabled. */ /* Report any deferred quiescent states if preemption enabled. */
@ -2780,20 +2782,6 @@ __rcu_process_callbacks(struct rcu_state *rsp)
/* Do any needed deferred wakeups of rcuo kthreads. */ /* Do any needed deferred wakeups of rcuo kthreads. */
do_nocb_deferred_wakeup(rdp); do_nocb_deferred_wakeup(rdp);
}
/*
* Do RCU core processing for the current CPU.
*/
static __latent_entropy void rcu_process_callbacks(struct softirq_action *unused)
{
struct rcu_state *rsp;
if (cpu_is_offline(smp_processor_id()))
return;
trace_rcu_utilization(TPS("Start RCU core"));
for_each_rcu_flavor(rsp)
__rcu_process_callbacks(rsp);
trace_rcu_utilization(TPS("End RCU core")); trace_rcu_utilization(TPS("End RCU core"));
} }