Commit-ID: cb349ca95407cbc11424d5e9fc7c8e700709041b
Gitweb: http://git.kernel.org/tip/cb349ca95407cbc11424d5e9fc7c8e700709041b
Author: Paul E. McKenney <paul.mckenney@xxxxxxxxxx>
AuthorDate: Tue, 4 Sep 2012 17:35:31 -0700
Committer: Frederic Weisbecker <fweisbec@xxxxxxxxx>
CommitDate: Wed, 26 Sep 2012 15:47:18 +0200
rcu: Apply micro-optimization and int/bool fixes to RCU's idle handling
Checking "user" before "is_idle_task()" allows better optimizations
in cases where inlining is possible. Also, "bool" should be passed
"true" or "false" rather than "1" or "0". This commit therefore makes
these changes, as noted in Josh's review.
Reported-by: Josh Triplett <josh@xxxxxxxxxxxxxxxx>
Signed-off-by: Paul E. McKenney <paul.mckenney@xxxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Josh Triplett <josh@xxxxxxxxxxxxxxxx>
---
kernel/rcutree.c | 16 ++++++++--------
1 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 812d04b..4fb2376 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -335,7 +335,7 @@ static void rcu_eqs_enter_common(struct rcu_dynticks *rdtp, long long oldval,
bool user)
{
trace_rcu_dyntick("Start", oldval, 0);
- if (!is_idle_task(current) && !user) {
+ if (!user && !is_idle_task(current)) {
struct task_struct *idle = idle_task(smp_processor_id());
trace_rcu_dyntick("Error on entry: not idle task", oldval, 0);
@@ -399,7 +399,7 @@ void rcu_idle_enter(void)
unsigned long flags;
local_irq_save(flags);
- rcu_eqs_enter(0);
+ rcu_eqs_enter(false);
local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(rcu_idle_enter);
@@ -435,7 +435,7 @@ void rcu_user_enter(void)
rdtp = &__get_cpu_var(rcu_dynticks);
if (!rdtp->ignore_user_qs && !rdtp->in_user) {
rdtp->in_user = true;
- rcu_eqs_enter(1);
+ rcu_eqs_enter(true);
}
local_irq_restore(flags);
}
@@ -492,7 +492,7 @@ void rcu_irq_exit(void)
if (rdtp->dynticks_nesting)
trace_rcu_dyntick("--=", oldval, rdtp->dynticks_nesting);
else
- rcu_eqs_enter_common(rdtp, oldval, 1);
+ rcu_eqs_enter_common(rdtp, oldval, true);
local_irq_restore(flags);
}
@@ -513,7 +513,7 @@ static void rcu_eqs_exit_common(struct rcu_dynticks *rdtp, long long oldval,
WARN_ON_ONCE(!(atomic_read(&rdtp->dynticks) & 0x1));
rcu_cleanup_after_idle(smp_processor_id());
trace_rcu_dyntick("End", oldval, rdtp->dynticks_nesting);
- if (!is_idle_task(current) && !user) {
+ if (!user && !is_idle_task(current)) {
struct task_struct *idle = idle_task(smp_processor_id());
trace_rcu_dyntick("Error on exit: not idle task",
@@ -560,7 +560,7 @@ void rcu_idle_exit(void)
unsigned long flags;
local_irq_save(flags);
- rcu_eqs_exit(0);
+ rcu_eqs_exit(false);
local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(rcu_idle_exit);
@@ -592,7 +592,7 @@ void rcu_user_exit(void)
rdtp = &__get_cpu_var(rcu_dynticks);
if (rdtp->in_user) {
rdtp->in_user = false;
- rcu_eqs_exit(1);
+ rcu_eqs_exit(true);
}
local_irq_restore(flags);
}
@@ -653,7 +653,7 @@ void rcu_irq_enter(void)
if (oldval)
trace_rcu_dyntick("++=", oldval, rdtp->dynticks_nesting);
else
- rcu_eqs_exit_common(rdtp, oldval, 1);
+ rcu_eqs_exit_common(rdtp, oldval, true);
local_irq_restore(flags);
}
--
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