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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-07-31 16:02:33 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-09-07 16:18:18 -0700 |
| commit | ade9862470dd0595d8e292ecea8445ed90b98df5 (patch) | |
| tree | 0870ea411c65d9ff102dbc896ee0c69fa9787b0d /kernel/rcu/tiny.c | |
| parent | 9fdd3bc9005824704f9802bec7b3e06f5edae434 (diff) | |
| download | linux-ade9862470dd0595d8e292ecea8445ed90b98df5.tar.gz | |
rcu: Make TINY_RCU tinier by putting error checks under #ifdef
The rcu_idle_enter_common() and rcu_idle_exit_common() functions contain error checks that have to the best of my knowledge have never triggered over the past several years. These are nevertheless valuable when creating new architectures or doing other low-level changes, so the checks should not be deleted. This commit instead places these checks under #ifdef CONFIG_RCU_TRACE so that they are executed only when specifically requested. The savings are significant: Before: text data bss dec hex filename 1749 39 0 1788 6fc /tmp/b/kernel/rcu/tiny.o 632 152 0 784 310 /tmp/b/kernel/rcu/update.o ---- 2572 After: text data bss dec hex filename 1281 37 0 1318 526 /tmp/b/kernel/rcu/tiny.o 632 152 0 784 310 /tmp/b/kernel/rcu/update.o ---- 2102 This amounts to 470 bytes, or 18% of the original. Switched from #ifdef to IS_ENABLED() on Josh Triplett's advice. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'kernel/rcu/tiny.c')
| -rw-r--r-- | kernel/rcu/tiny.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c index 6bd785c34add..4a55a2416e3c 100644 --- a/kernel/rcu/tiny.c +++ b/kernel/rcu/tiny.c @@ -62,7 +62,7 @@ static void rcu_idle_enter_common(long long newval) } RCU_TRACE(trace_rcu_dyntick(TPS("Start"), rcu_dynticks_nesting, newval)); - if (!is_idle_task(current)) { + if (IS_ENABLED(CONFIG_RCU_TRACE) && !is_idle_task(current)) { struct task_struct *idle __maybe_unused = idle_task(smp_processor_id()); RCU_TRACE(trace_rcu_dyntick(TPS("Entry error: not idle task"), @@ -123,7 +123,7 @@ static void rcu_idle_exit_common(long long oldval) return; } RCU_TRACE(trace_rcu_dyntick(TPS("End"), oldval, rcu_dynticks_nesting)); - if (!is_idle_task(current)) { + if (IS_ENABLED(CONFIG_RCU_TRACE) && !is_idle_task(current)) { struct task_struct *idle __maybe_unused = idle_task(smp_processor_id()); RCU_TRACE(trace_rcu_dyntick(TPS("Exit error: not idle task"), |