diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 47e34c091276..e8e8fe505df1 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -183,7 +183,8 @@ void cpu_idle(void)
/* endless idle loop with no priority at all */
while (1) {
- tick_nohz_idle_enter_norcu();
+ tick_nohz_idle_enter();
+ rcu_idle_enter();
leds_event(led_idle_start);
while (!need_resched()) {
#ifdef CONFIG_HOTPLUG_CPU
@@ -213,7 +214,8 @@ void cpu_idle(void)
}
}
leds_event(led_idle_end);
- tick_nohz_idle_exit_norcu();
+ rcu_idle_exit();
+ tick_nohz_idle_exit();
preempt_enable_no_resched();
schedule();
preempt_disable();
diff --git a/arch/avr32/kernel/process.c b/arch/avr32/kernel/process.c
index 34c8c703bb16..ea3395750324 100644
--- a/arch/avr32/kernel/process.c
+++ b/arch/avr32/kernel/process.c
@@ -34,10 +34,12 @@ void cpu_idle(void)
{
/* endless idle loop with no priority at all */
while (1) {
- tick_nohz_idle_enter_norcu();
+ tick_nohz_idle_enter();
+ rcu_idle_enter();
while (!need_resched())
cpu_idle_sleep();
- tick_nohz_idle_exit_norcu();
+ rcu_idle_exit();
+ tick_nohz_idle_exit();
preempt_enable_no_resched();
schedule();
preempt_disable();
diff --git a/arch/blackfin/kernel/process.c b/arch/blackfin/kernel/process.c
index 57e07498a0e7..8dd0416673cb 100644
--- a/arch/blackfin/kernel/process.c
+++ b/arch/blackfin/kernel/process.c
@@ -88,10 +88,12 @@ void cpu_idle(void)
#endif
if (!idle)
idle = default_idle;
- tick_nohz_idle_enter_norcu();
+ tick_nohz_idle_enter();
+ rcu_idle_enter();
while (!need_resched())
idle();
- tick_nohz_idle_exit_norcu();
+ rcu_idle_exit();
+ tick_nohz_idle_exit();
preempt_enable_no_resched();
schedule();
preempt_disable();
diff --git a/arch/microblaze/kernel/process.c b/arch/microblaze/kernel/process.c
index 13d59f34b94e..7dcb5bfffb75 100644
--- a/arch/microblaze/kernel/process.c
+++ b/arch/microblaze/kernel/process.c
@@ -103,10 +103,12 @@ void cpu_idle(void)
if (!idle)
idle = default_idle;
- tick_nohz_idle_enter_norcu();
+ tick_nohz_idle_enter();
+ rcu_idle_enter();
while (!need_resched())
idle();
- tick_nohz_idle_exit_norcu();
+ rcu_idle_exit();
+ tick_nohz_idle_exit();
preempt_enable_no_resched();
schedule();
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 17fb3a270160..7955409051c4 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -56,7 +56,8 @@ void __noreturn cpu_idle(void)
/* endless idle loop with no priority at all */
while (1) {
- tick_nohz_idle_enter_norcu();
+ tick_nohz_idle_enter();
+ rcu_idle_enter();
while (!need_resched() && cpu_online(cpu)) {
#ifdef CONFIG_MIPS_MT_SMTC
extern void smtc_idle_loop_hook(void);
@@ -77,7 +78,8 @@ void __noreturn cpu_idle(void)
system_state == SYSTEM_BOOTING))
play_dead();
#endif
- tick_nohz_idle_exit_norcu();
+ rcu_idle_exit();
+ tick_nohz_idle_exit();
preempt_enable_no_resched();
schedule();
preempt_disable();
diff --git a/arch/openrisc/kernel/idle.c b/arch/openrisc/kernel/idle.c
index 2e82cd0fa5e1..e5fc78877830 100644
--- a/arch/openrisc/kernel/idle.c
+++ b/arch/openrisc/kernel/idle.c
@@ -51,7 +51,8 @@ void cpu_idle(void)
/* endless idle loop with no priority at all */
while (1) {
- tick_nohz_idle_enter_norcu();
+ tick_nohz_idle_enter();
+ rcu_idle_enter();
while (!need_resched()) {
check_pgt_cache();
@@ -69,7 +70,8 @@ void cpu_idle(void)
set_thread_flag(TIF_POLLING_NRFLAG);
}
- tick_nohz_idle_exit_norcu();
+ rcu_idle_exit();
+ tick_nohz_idle_exit();
preempt_enable_no_resched();
schedule();
preempt_disable();
diff --git a/arch/powerpc/kernel/idle.c b/arch/powerpc/kernel/idle.c
index 3cd73d1fc427..9c3cd490b1bd 100644
--- a/arch/powerpc/kernel/idle.c
+++ b/arch/powerpc/kernel/idle.c
@@ -62,10 +62,10 @@ void cpu_idle(void)
set_thread_flag(TIF_POLLING_NRFLAG);
while (1) {
- if (idle_uses_rcu)
- tick_nohz_idle_enter();
- else
- tick_nohz_idle_enter_norcu();
+ tick_nohz_idle_enter();
+ if (!idle_uses_rcu)
+ rcu_idle_enter();
+
while (!need_resched() && !cpu_should_die()) {
ppc64_runlatch_off();
@@ -102,10 +102,9 @@ void cpu_idle(void)
HMT_medium();
ppc64_runlatch_on();
- if (idle_uses_rcu)
- tick_nohz_idle_exit();
- else
- tick_nohz_idle_exit_norcu();
+ if (!idle_uses_rcu)
+ rcu_idle_exit();
+ tick_nohz_idle_exit();
preempt_enable_no_resched();
if (cpu_should_die())
cpu_die();
diff --git a/arch/powerpc/platforms/iseries/setup.c b/arch/powerpc/platforms/iseries/setup.c
index d69d3d185e89..8fc62586a973 100644
--- a/arch/powerpc/platforms/iseries/setup.c
+++ b/arch/powerpc/platforms/iseries/setup.c
@@ -563,7 +563,8 @@ static void yield_shared_processor(void)
static void iseries_shared_idle(void)
{
while (1) {
- tick_nohz_idle_enter_norcu();
+ tick_nohz_idle_enter();
+ rcu_idle_enter();
while (!need_resched() && !hvlpevent_is_pending()) {
local_irq_disable();
ppc64_runlatch_off();
@@ -577,7 +578,8 @@ static void iseries_shared_idle(void)
}
ppc64_runlatch_on();
- tick_nohz_idle_exit_norcu();
+ rcu_idle_exit();
+ tick_nohz_idle_exit();
if (hvlpevent_is_pending())
process_iSeries_events();
@@ -593,7 +595,8 @@ static void iseries_dedicated_idle(void)
set_thread_flag(TIF_POLLING_NRFLAG);
while (1) {
- tick_nohz_idle_enter_norcu();
+ tick_nohz_idle_enter();
+ rcu_idle_enter();
if (!need_resched()) {
while (!need_resched()) {
ppc64_runlatch_off();
@@ -610,7 +613,8 @@ static void iseries_dedicated_idle(void)
}
ppc64_runlatch_on();
- tick_nohz_idle_exit_norcu();
+ rcu_idle_exit();
+ tick_nohz_idle_exit();
preempt_enable_no_resched();
schedule();
preempt_disable();
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 6fa987367ae6..3201ae447990 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -91,10 +91,12 @@ static void default_idle(void)
void cpu_idle(void)
{
for (;;) {
- tick_nohz_idle_enter_norcu();
+ tick_nohz_idle_enter();
+ rcu_idle_enter();
while (!need_resched())
default_idle();
- tick_nohz_idle_exit_norcu();
+ rcu_idle_exit();
+ tick_nohz_idle_exit();
preempt_enable_no_resched();
schedule();
preempt_disable();
diff --git a/arch/sh/kernel/idle.c b/arch/sh/kernel/idle.c
index ad58e7535a7c..406508d4ce74 100644
--- a/arch/sh/kernel/idle.c
+++ b/arch/sh/kernel/idle.c
@@ -89,7 +89,8 @@ void cpu_idle(void)
/* endless idle loop with no priority at all */
while (1) {
- tick_nohz_idle_enter_norcu();
+ tick_nohz_idle_enter();
+ rcu_idle_enter();
while (!need_resched()) {
check_pgt_cache();
@@ -111,7 +112,8 @@ void cpu_idle(void)
start_critical_timings();
}
- tick_nohz_idle_exit_norcu();
+ rcu_idle_exit();
+ tick_nohz_idle_exit();
preempt_enable_no_resched();
schedule();
preempt_disable();
diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c
index 4a0e7d79cb92..39d8b05201a2 100644
--- a/arch/sparc/kernel/process_64.c
+++ b/arch/sparc/kernel/process_64.c
@@ -95,12 +95,14 @@ void cpu_idle(void)
set_thread_flag(TIF_POLLING_NRFLAG);
while(1) {
- tick_nohz_idle_enter_norcu();
+ tick_nohz_idle_enter();
+ rcu_idle_enter();
while (!need_resched() && !cpu_is_offline(cpu))
sparc64_yield(cpu);
- tick_nohz_idle_exit_norcu();
+ rcu_idle_exit();
+ tick_nohz_idle_exit();
preempt_enable_no_resched();
diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c
index 53ac89595ab1..4c1ac6e5347a 100644
--- a/arch/tile/kernel/process.c
+++ b/arch/tile/kernel/process.c
@@ -85,7 +85,8 @@ void cpu_idle(void)
/* endless idle loop with no priority at all */
while (1) {
- tick_nohz_idle_enter_norcu();
+ tick_nohz_idle_enter();
+ rcu_idle_enter();
while (!need_resched()) {
if (cpu_is_offline(cpu))
BUG(); /* no HOTPLUG_CPU */
@@ -105,7 +106,8 @@ void cpu_idle(void)
local_irq_enable();
current_thread_info()->status |= TS_POLLING;
}
- tick_nohz_idle_exit_norcu();
+ rcu_idle_exit();
+ tick_nohz_idle_exit();
preempt_enable_no_resched();
schedule();
preempt_disable();
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index 55d2cf455f63..69f24905abdc 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -246,10 +246,12 @@ void default_idle(void)
if (need_resched())
schedule();
- tick_nohz_idle_enter_norcu();
+ tick_nohz_idle_enter();
+ rcu_idle_enter();
nsecs = disable_timer();
idle_sleep(nsecs);
- tick_nohz_idle_exit_norcu();
+ rcu_idle_exit();
+ tick_nohz_idle_exit();
}
}
diff --git a/arch/unicore32/kernel/process.c b/arch/unicore32/kernel/process.c
index 095ff5a57928..52edc2b62873 100644
--- a/arch/unicore32/kernel/process.c
+++ b/arch/unicore32/kernel/process.c
@@ -55,7 +55,8 @@ void cpu_idle(void)
{
/* endless idle loop with no priority at all */
while (1) {
- tick_nohz_idle_enter_norcu();
+ tick_nohz_idle_enter();
+ rcu_idle_enter();
while (!need_resched()) {
local_irq_disable();
stop_critical_timings();
@@ -63,7 +64,8 @@ void cpu_idle(void)
local_irq_enable();
start_critical_timings();
}
- tick_nohz_idle_exit_norcu();
+ rcu_idle_exit();
+ tick_nohz_idle_exit();
preempt_enable_no_resched();
schedule();
preempt_disable();
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index f94da3920c36..485204f58cda 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -99,7 +99,8 @@ void cpu_idle(void)
/* endless idle loop with no priority at all */
while (1) {
- tick_nohz_idle_enter_norcu();
+ tick_nohz_idle_enter();
+ rcu_idle_enter();
while (!need_resched()) {
check_pgt_cache();
@@ -116,7 +117,8 @@ void cpu_idle(void)
pm_idle();
start_critical_timings();
}
- tick_nohz_idle_exit_norcu();
+ rcu_idle_exit();
+ tick_nohz_idle_exit();
preempt_enable_no_resched();
schedule();
preempt_disable();
diff --git a/include/linux/tick.h b/include/linux/tick.h
index 327434a05757..ab8be90b5cc9 100644
--- a/include/linux/tick.h
+++ b/include/linux/tick.h
@@ -122,45 +122,8 @@ static inline int tick_oneshot_mode_active(void) { return 0; }
#endif /* !CONFIG_GENERIC_CLOCKEVENTS */
# ifdef CONFIG_NO_HZ
-extern void __tick_nohz_idle_enter(void);
-static inline void tick_nohz_idle_enter(void)
-{
- local_irq_disable();
- __tick_nohz_idle_enter();
- local_irq_enable();
-}
+extern void tick_nohz_idle_enter(void);
extern void tick_nohz_idle_exit(void);
-
-/*
- * Call this pair of function if the arch doesn't make any use
- * of RCU in-between. You won't need to call rcu_idle_enter() and
- * rcu_idle_exit().
- * Otherwise you need to call tick_nohz_idle_enter() and tick_nohz_idle_exit()
- * and explicitly tell RCU about the window around the place the CPU enters low
- * power mode where no RCU use is made. This is done by calling rcu_idle_enter()
- * after the last use of RCU before the CPU is put to sleep and by calling
- * rcu_idle_exit() before the first use of RCU after the CPU woke up.
- */
-static inline void tick_nohz_idle_enter_norcu(void)
-{
- /*
- * Also call rcu_idle_enter() in the irq disabled section even
- * if it disables irq itself.
- * Just an optimization that prevents from an interrupt happening
- * between it and __tick_nohz_idle_enter() to lose time to help
- * completing a grace period while we could be in extended grace
- * period already.
- */
- local_irq_disable();
- __tick_nohz_idle_enter();
- rcu_idle_enter();
- local_irq_enable();
-}
-static inline void tick_nohz_idle_exit_norcu(void)
-{
- rcu_idle_exit();
- tick_nohz_idle_exit();
-}
extern void tick_nohz_irq_exit(void);
extern ktime_t tick_nohz_get_sleep_length(void);
extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
@@ -168,14 +131,6 @@ extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time);
# else
static inline void tick_nohz_idle_enter(void) { }
static inline void tick_nohz_idle_exit(void) { }
-static inline void tick_nohz_idle_enter_norcu(void)
-{
- rcu_idle_enter();
-}
-static inline void tick_nohz_idle_exit_norcu(void)
-{
- rcu_idle_exit();
-}
static inline ktime_t tick_nohz_get_sleep_length(void)
{
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index c76aefe764b0..0ec8b832ab6b 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -454,21 +454,20 @@ static void tick_nohz_stop_sched_tick(struct tick_sched *ts)
* When the next event is more than a tick into the future, stop the idle tick
* Called when we start the idle loop.
*
- * If no use of RCU is made in the idle loop between
- * tick_nohz_idle_enter() and tick_nohz_idle_exit() calls, then
- * tick_nohz_idle_enter_norcu() should be called instead and the arch
- * doesn't need to call rcu_idle_enter() and rcu_idle_exit() explicitly.
- *
- * Otherwise the arch is responsible of calling:
+ * The arch is responsible of calling:
*
* - rcu_idle_enter() after its last use of RCU before the CPU is put
* to sleep.
* - rcu_idle_exit() before the first use of RCU after the CPU is woken up.
*/
-void __tick_nohz_idle_enter(void)
+void tick_nohz_idle_enter(void)
{
struct tick_sched *ts;
+ WARN_ON_ONCE(irqs_disabled());
+
+ local_irq_disable();
+
ts = &__get_cpu_var(tick_cpu_sched);
/*
* set ts->inidle unconditionally. even if the system did not
@@ -477,6 +476,8 @@ void __tick_nohz_idle_enter(void)
*/
ts->inidle = 1;
tick_nohz_stop_sched_tick(ts);
+
+ local_irq_enable();
}
/**