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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-09-28 18:19:24 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-12-04 12:27:29 -0800 |
| commit | fecbf6f01fbd83e6419ccb7f61d9a6eb987f1d92 (patch) | |
| tree | 3d16cf050eae5940f2ef115a5db601a66b3fe7c1 /kernel/rcu | |
| parent | 47dbc90663f697a4515a8dd5c99ae43dba108cb4 (diff) | |
| download | linux-0-day-fecbf6f01fbd83e6419ccb7f61d9a6eb987f1d92.tar.gz linux-0-day-fecbf6f01fbd83e6419ccb7f61d9a6eb987f1d92.tar.xz | |
rcu: Simplify rcu_sched_qs() control flow
This commit applies an early-exit approach to rcu_sched_qs(), reducing
the nesting level and saving a line of code.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree.c | 29 |
1 files changed, 14 insertions, 15 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 23df2661c8990..ed3bc0578cc5d 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -244,22 +244,21 @@ void rcu_sched_qs(void) { unsigned long flags; - if (__this_cpu_read(rcu_sched_data.cpu_no_qs.s)) { - trace_rcu_grace_period(TPS("rcu_sched"), - __this_cpu_read(rcu_sched_data.gpnum), - TPS("cpuqs")); - __this_cpu_write(rcu_sched_data.cpu_no_qs.b.norm, false); - if (!__this_cpu_read(rcu_sched_data.cpu_no_qs.b.exp)) - return; - local_irq_save(flags); - if (__this_cpu_read(rcu_sched_data.cpu_no_qs.b.exp)) { - __this_cpu_write(rcu_sched_data.cpu_no_qs.b.exp, false); - rcu_report_exp_rdp(&rcu_sched_state, - this_cpu_ptr(&rcu_sched_data), - true); - } - local_irq_restore(flags); + if (!__this_cpu_read(rcu_sched_data.cpu_no_qs.s)) + return; + trace_rcu_grace_period(TPS("rcu_sched"), + __this_cpu_read(rcu_sched_data.gpnum), + TPS("cpuqs")); + __this_cpu_write(rcu_sched_data.cpu_no_qs.b.norm, false); + if (!__this_cpu_read(rcu_sched_data.cpu_no_qs.b.exp)) + return; + local_irq_save(flags); + if (__this_cpu_read(rcu_sched_data.cpu_no_qs.b.exp)) { + __this_cpu_write(rcu_sched_data.cpu_no_qs.b.exp, false); + rcu_report_exp_rdp(&rcu_sched_state, + this_cpu_ptr(&rcu_sched_data), true); } + local_irq_restore(flags); } void rcu_bh_qs(void) |