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-rw-r--r--include/linux/entry-kvm.h3
-rw-r--r--include/linux/tick.h7
-rw-r--r--kernel/entry/common.c5
-rw-r--r--kernel/time/tick-sched.c1
4 files changed, 13 insertions, 3 deletions
diff --git a/include/linux/entry-kvm.h b/include/linux/entry-kvm.h
index 8b2b1d68b954..136b8d97d8c0 100644
--- a/include/linux/entry-kvm.h
+++ b/include/linux/entry-kvm.h
@@ -3,6 +3,7 @@
#define __LINUX_ENTRYKVM_H
#include <linux/entry-common.h>
+#include <linux/tick.h>
/* Transfer to guest mode work */
#ifdef CONFIG_KVM_XFER_TO_GUEST_WORK
@@ -57,7 +58,7 @@ int xfer_to_guest_mode_handle_work(struct kvm_vcpu *vcpu);
static inline void xfer_to_guest_mode_prepare(void)
{
lockdep_assert_irqs_disabled();
- rcu_nocb_flush_deferred_wakeup();
+ tick_nohz_user_enter_prepare();
}
/**
diff --git a/include/linux/tick.h b/include/linux/tick.h
index 7340613c7eff..1a0ff88fa107 100644
--- a/include/linux/tick.h
+++ b/include/linux/tick.h
@@ -11,6 +11,7 @@
#include <linux/context_tracking_state.h>
#include <linux/cpumask.h>
#include <linux/sched.h>
+#include <linux/rcupdate.h>
#ifdef CONFIG_GENERIC_CLOCKEVENTS
extern void __init tick_init(void);
@@ -300,4 +301,10 @@ static inline void tick_nohz_task_switch(void)
__tick_nohz_task_switch();
}
+static inline void tick_nohz_user_enter_prepare(void)
+{
+ if (tick_nohz_full_cpu(smp_processor_id()))
+ rcu_nocb_flush_deferred_wakeup();
+}
+
#endif
diff --git a/kernel/entry/common.c b/kernel/entry/common.c
index a0b3b04fb596..bf16395b9e13 100644
--- a/kernel/entry/common.c
+++ b/kernel/entry/common.c
@@ -5,6 +5,7 @@
#include <linux/highmem.h>
#include <linux/livepatch.h>
#include <linux/audit.h>
+#include <linux/tick.h>
#include "common.h"
@@ -186,7 +187,7 @@ static unsigned long exit_to_user_mode_loop(struct pt_regs *regs,
local_irq_disable_exit_to_user();
/* Check if any of the above work has queued a deferred wakeup */
- rcu_nocb_flush_deferred_wakeup();
+ tick_nohz_user_enter_prepare();
ti_work = READ_ONCE(current_thread_info()->flags);
}
@@ -202,7 +203,7 @@ static void exit_to_user_mode_prepare(struct pt_regs *regs)
lockdep_assert_irqs_disabled();
/* Flush pending rcuog wakeup before the last need_resched() check */
- rcu_nocb_flush_deferred_wakeup();
+ tick_nohz_user_enter_prepare();
if (unlikely(ti_work & EXIT_TO_USER_MODE_WORK))
ti_work = exit_to_user_mode_loop(regs, ti_work);
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 828b091501ca..6784f27a3099 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -230,6 +230,7 @@ static void tick_sched_handle(struct tick_sched *ts, struct pt_regs *regs)
#ifdef CONFIG_NO_HZ_FULL
cpumask_var_t tick_nohz_full_mask;
+EXPORT_SYMBOL_GPL(tick_nohz_full_mask);
bool tick_nohz_full_running;
EXPORT_SYMBOL_GPL(tick_nohz_full_running);
static atomic_t tick_dep_mask;