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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2016-03-16 16:27:44 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2016-03-31 13:34:10 -0700 |
| commit | 179e5dcd1e5bdfac1128431d131b31322aedd2bc (patch) | |
| tree | 7900da31bdb0b0e2468c2547e128301af69ec9f9 /kernel/rcu | |
| parent | 4ea3e85b113ab37a2d55cfabf0d709ddec088bb3 (diff) | |
| download | linux-179e5dcd1e5bdfac1128431d131b31322aedd2bc.tar.gz linux-179e5dcd1e5bdfac1128431d131b31322aedd2bc.tar.bz2 linux-179e5dcd1e5bdfac1128431d131b31322aedd2bc.zip | |
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>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree.c | 8 | ||||
| -rw-r--r-- | kernel/rcu/tree_plugin.h | 2 |
2 files changed, 5 insertions, 5 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index fd86eca9478e..5b1c8fd89af0 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -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. */ diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index b6d5dde6eab9..529a44085a63 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -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. */ |