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rcu: Make RCU use the new is_idle_task() API 

Change from direct comparison of ->pid with zero to is_idle_task().

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Paul E. McKenney 2011-11-10 15:48:45 -08:00 committed by Paul E. McKenney
parent c4f3060843
commit 99745b6a83
2 changed files with 4 additions and 4 deletions
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4
kernel/rcutiny.c
View File

@ -64,7 +64,7 @@ static void rcu_idle_enter_common(long long oldval)
return; return;
} }
RCU_TRACE(trace_rcu_dyntick("Start", oldval, rcu_dynticks_nesting)); RCU_TRACE(trace_rcu_dyntick("Start", oldval, rcu_dynticks_nesting));
if (current->pid != 0) { if (!is_idle_task(current)) {
struct task_struct *idle = idle_task(smp_processor_id()); struct task_struct *idle = idle_task(smp_processor_id());
RCU_TRACE(trace_rcu_dyntick("Error on entry: not idle task", RCU_TRACE(trace_rcu_dyntick("Error on entry: not idle task",
@ -118,7 +118,7 @@ static void rcu_idle_exit_common(long long oldval)
return; return;
} }
RCU_TRACE(trace_rcu_dyntick("End", oldval, rcu_dynticks_nesting)); RCU_TRACE(trace_rcu_dyntick("End", oldval, rcu_dynticks_nesting));
if (current->pid != 0) { if (!is_idle_task(current)) {
struct task_struct *idle = idle_task(smp_processor_id()); struct task_struct *idle = idle_task(smp_processor_id());
RCU_TRACE(trace_rcu_dyntick("Error on exit: not idle task", RCU_TRACE(trace_rcu_dyntick("Error on exit: not idle task",

4
kernel/rcutree.c
View File

@ -355,7 +355,7 @@ static void rcu_idle_enter_common(struct rcu_dynticks *rdtp, long long oldval)
return; return;
} }
trace_rcu_dyntick("Start", oldval, rdtp->dynticks_nesting); trace_rcu_dyntick("Start", oldval, rdtp->dynticks_nesting);
if (current->pid != 0) { if (!is_idle_task(current)) {
struct task_struct *idle = idle_task(smp_processor_id()); struct task_struct *idle = idle_task(smp_processor_id());
trace_rcu_dyntick("Error on entry: not idle task", trace_rcu_dyntick("Error on entry: not idle task",
@ -449,7 +449,7 @@ static void rcu_idle_exit_common(struct rcu_dynticks *rdtp, long long oldval)
smp_mb__after_atomic_inc(); /* See above. */ smp_mb__after_atomic_inc(); /* See above. */
WARN_ON_ONCE(!(atomic_read(&rdtp->dynticks) & 0x1)); WARN_ON_ONCE(!(atomic_read(&rdtp->dynticks) & 0x1));
trace_rcu_dyntick("End", oldval, rdtp->dynticks_nesting); trace_rcu_dyntick("End", oldval, rdtp->dynticks_nesting);
if (current->pid != 0) { if (!is_idle_task(current)) {
struct task_struct *idle = idle_task(smp_processor_id()); struct task_struct *idle = idle_task(smp_processor_id());
trace_rcu_dyntick("Error on exit: not idle task", trace_rcu_dyntick("Error on exit: not idle task",