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rcu: Consolidate expedited GP tracing into rcu_exp_gp_seq_snap() 

This commit moves some duplicate code from synchronize_rcu_expedited()
and synchronize_sched_expedited() into rcu_exp_gp_seq_snap().  This
doesn't save lines of code, but does eliminate a "tell me twice" issue.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2016-03-16 16:27:44 -07:00
parent 4ea3e85b11
commit 179e5dcd1e
2 changed files with 5 additions and 5 deletions
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8
kernel/rcu/tree.c
View File

@ -3392,8 +3392,12 @@ static void rcu_exp_gp_seq_end(struct rcu_state *rsp)
}
static unsigned long rcu_exp_gp_seq_snap(struct rcu_state *rsp)
{
unsigned long s;
smp_mb(); /* Caller's modifications seen first by other CPUs. */
return rcu_seq_snap(&rsp->expedited_sequence);
s = rcu_seq_snap(&rsp->expedited_sequence);
trace_rcu_exp_grace_period(rsp->name, s, TPS("snap"));
return s;
}
static bool rcu_exp_gp_seq_done(struct rcu_state *rsp, unsigned long s)
{
@ -3898,8 +3902,6 @@ void synchronize_sched_expedited(void)
/* Take a snapshot of the sequence number. */
s = rcu_exp_gp_seq_snap(rsp);
trace_rcu_exp_grace_period(rsp->name, s, TPS("snap"));
if (exp_funnel_lock(rsp, s))
return; /* Someone else did our work for us. */

2
kernel/rcu/tree_plugin.h
View File

@ -748,8 +748,6 @@ void synchronize_rcu_expedited(void)
}
s = rcu_exp_gp_seq_snap(rsp);
trace_rcu_exp_grace_period(rsp->name, s, TPS("snap"));
if (exp_funnel_lock(rsp, s))
return; /* Someone else did our work for us. */