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rcu: Remove rsp parameter from CPU hotplug functions 

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_cleanup_dying_cpu() and rcu_cleanup_dead_cpu().  And, as long as
we are in the neighborhood, inlines them into rcutree_dying_cpu() and
rcutree_dead_cpu(), respectively.  This also eliminates a pair of
for_each_rcu_flavor() loops.

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 8087d3e3c4
commit 780cd59083
1 changed files with 11 additions and 32 deletions
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43
kernel/rcu/tree.c
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@ -2402,20 +2402,22 @@ rcu_check_quiescent_state(struct rcu_data *rdp)
}
/*
* Trace the fact that this CPU is going offline.
* Near the end of the offline process. Trace the fact that this CPU
* is going offline.
*/
static void rcu_cleanup_dying_cpu(struct rcu_state *rsp)
int rcutree_dying_cpu(unsigned int cpu)
{
RCU_TRACE(bool blkd;)
RCU_TRACE(struct rcu_data *rdp = this_cpu_ptr(&rcu_data);)
RCU_TRACE(struct rcu_node *rnp = rdp->mynode;)
if (!IS_ENABLED(CONFIG_HOTPLUG_CPU))
return;
return 0;
RCU_TRACE(blkd = !!(rnp->qsmask & rdp->grpmask);)
trace_rcu_grace_period(rsp->name, rnp->gp_seq,
trace_rcu_grace_period(rcu_state.name, rnp->gp_seq,
blkd ? TPS("cpuofl") : TPS("cpuofl-bgp"));
return 0;
}
/*
@ -2469,16 +2471,19 @@ static void rcu_cleanup_dead_rnp(struct rcu_node *rnp_leaf)
* There can only be one CPU hotplug operation at a time, so no need for
* explicit locking.
*/
static void rcu_cleanup_dead_cpu(int cpu, struct rcu_state *rsp)
int rcutree_dead_cpu(unsigned int cpu)
{
struct rcu_data *rdp = per_cpu_ptr(&rcu_data, cpu);
struct rcu_node *rnp = rdp->mynode; /* Outgoing CPU's rdp & rnp. */
if (!IS_ENABLED(CONFIG_HOTPLUG_CPU))
return;
return 0;
/* Adjust any no-longer-needed kthreads. */
rcu_boost_kthread_setaffinity(rnp, -1);
/* Do any needed no-CB deferred wakeups from this CPU. */
do_nocb_deferred_wakeup(per_cpu_ptr(&rcu_data, cpu));
return 0;
}
/*
@ -3514,32 +3519,6 @@ int rcutree_offline_cpu(unsigned int cpu)
return 0;
}
/*
* Near the end of the offline process. We do only tracing here.
*/
int rcutree_dying_cpu(unsigned int cpu)
{
struct rcu_state *rsp;
for_each_rcu_flavor(rsp)
rcu_cleanup_dying_cpu(rsp);
return 0;
}
/*
* The outgoing CPU is gone and we are running elsewhere.
*/
int rcutree_dead_cpu(unsigned int cpu)
{
struct rcu_state *rsp;
for_each_rcu_flavor(rsp) {
rcu_cleanup_dead_cpu(cpu, rsp);
do_nocb_deferred_wakeup(per_cpu_ptr(&rcu_data, cpu));
}
return 0;
}
static DEFINE_PER_CPU(int, rcu_cpu_started);
/*