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authorLinus Torvalds <torvalds@linux-foundation.org>2012-01-06 20:02:40 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-06 20:02:40 +0400
commit423d091dfe58d3109d84c408810a7cfa82f6f184 (patch)
tree43c4385d1dc7219582f924d42db1f3e203a577bd /arch/powerpc/kernel/idle.c
parent1483b3823542c9721eddf09a077af1e02ac96b50 (diff)
parent919b83452b2e7c1dbced0456015508b4b9585db3 (diff)
downloadlinux-423d091dfe58d3109d84c408810a7cfa82f6f184.tar.xz
Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
* 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (64 commits) cpu: Export cpu_up() rcu: Apply ACCESS_ONCE() to rcu_boost() return value Revert "rcu: Permit rt_mutex_unlock() with irqs disabled" docs: Additional LWN links to RCU API rcu: Augment rcu_batch_end tracing for idle and callback state rcu: Add rcutorture tests for srcu_read_lock_raw() rcu: Make rcutorture test for hotpluggability before offlining CPUs driver-core/cpu: Expose hotpluggability to the rest of the kernel rcu: Remove redundant rcu_cpu_stall_suppress declaration rcu: Adaptive dyntick-idle preparation rcu: Keep invoking callbacks if CPU otherwise idle rcu: Irq nesting is always 0 on rcu_enter_idle_common rcu: Don't check irq nesting from rcu idle entry/exit rcu: Permit dyntick-idle with callbacks pending rcu: Document same-context read-side constraints rcu: Identify dyntick-idle CPUs on first force_quiescent_state() pass rcu: Remove dynticks false positives and RCU failures rcu: Reduce latency of rcu_prepare_for_idle() rcu: Eliminate RCU_FAST_NO_HZ grace-period hang rcu: Avoid needlessly IPIing CPUs at GP end ...
Diffstat (limited to 'arch/powerpc/kernel/idle.c')
-rw-r--r--arch/powerpc/kernel/idle.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/idle.c b/arch/powerpc/kernel/idle.c
index 39a2baa6ad58..9c3cd490b1bd 100644
--- a/arch/powerpc/kernel/idle.c
+++ b/arch/powerpc/kernel/idle.c
@@ -46,6 +46,12 @@ static int __init powersave_off(char *arg)
}
__setup("powersave=off", powersave_off);
+#if defined(CONFIG_PPC_PSERIES) && defined(CONFIG_TRACEPOINTS)
+static const bool idle_uses_rcu = 1;
+#else
+static const bool idle_uses_rcu;
+#endif
+
/*
* The body of the idle task.
*/
@@ -56,7 +62,10 @@ void cpu_idle(void)
set_thread_flag(TIF_POLLING_NRFLAG);
while (1) {
- tick_nohz_stop_sched_tick(1);
+ tick_nohz_idle_enter();
+ if (!idle_uses_rcu)
+ rcu_idle_enter();
+
while (!need_resched() && !cpu_should_die()) {
ppc64_runlatch_off();
@@ -93,7 +102,9 @@ void cpu_idle(void)
HMT_medium();
ppc64_runlatch_on();
- tick_nohz_restart_sched_tick();
+ if (!idle_uses_rcu)
+ rcu_idle_exit();
+ tick_nohz_idle_exit();
preempt_enable_no_resched();
if (cpu_should_die())
cpu_die();