Merge branch 'perf/core' into perf/uprobes

Merge in latest upstream (and the latest perf development tree),
to prepare for tooling changes, and also to pick up v3.4 MM
changes that the uprobes code needs to take care of.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 29 insertions, 17 deletions

diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
index b9a7fdd9c81..1c2cdd59ccd 100644
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -165,13 +165,6 @@ static inline int ext_hash(u16 code)
 	return (code + (code >> 9)) & 0xff;
 }
 
-static void ext_int_hash_update(struct rcu_head *head)
-{
-	struct ext_int_info *p = container_of(head, struct ext_int_info, rcu);
-
-	kfree(p);
-}
-
 int register_external_interrupt(u16 code, ext_int_handler_t handler)
 {
 	struct ext_int_info *p;
@@ -202,38 +195,34 @@ int unregister_external_interrupt(u16 code, ext_int_handler_t handler)
 	list_for_each_entry_rcu(p, &ext_int_hash[index], entry)
 		if (p->code == code && p->handler == handler) {
 			list_del_rcu(&p->entry);
-			call_rcu(&p->rcu, ext_int_hash_update);
+			kfree_rcu(p, rcu);
 		}
 	spin_unlock_irqrestore(&ext_int_hash_lock, flags);
 	return 0;
 }
 EXPORT_SYMBOL(unregister_external_interrupt);
 
-void __irq_entry do_extint(struct pt_regs *regs, unsigned int ext_int_code,
+void __irq_entry do_extint(struct pt_regs *regs, struct ext_code ext_code,
 			   unsigned int param32, unsigned long param64)
 {
 	struct pt_regs *old_regs;
-	unsigned short code;
 	struct ext_int_info *p;
 	int index;
 
-	code = (unsigned short) ext_int_code;
 	old_regs = set_irq_regs(regs);
-	s390_idle_check(regs, S390_lowcore.int_clock,
-			S390_lowcore.async_enter_timer);
 	irq_enter();
 	if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator)
 		/* Serve timer interrupts first. */
 		clock_comparator_work();
 	kstat_cpu(smp_processor_id()).irqs[EXTERNAL_INTERRUPT]++;
-	if (code != 0x1004)
+	if (ext_code.code != 0x1004)
 		__get_cpu_var(s390_idle).nohz_delay = 1;
 
-	index = ext_hash(code);
+	index = ext_hash(ext_code.code);
 	rcu_read_lock();
 	list_for_each_entry_rcu(p, &ext_int_hash[index], entry)
-		if (likely(p->code == code))
-			p->handler(ext_int_code, param32, param64);
+		if (likely(p->code == ext_code.code))
+			p->handler(ext_code, param32, param64);
 	rcu_read_unlock();
 	irq_exit();
 	set_irq_regs(old_regs);
@@ -266,3 +255,26 @@ void service_subclass_irq_unregister(void)
 	spin_unlock(&sc_irq_lock);
 }
 EXPORT_SYMBOL(service_subclass_irq_unregister);
+
+static DEFINE_SPINLOCK(ma_subclass_lock);
+static int ma_subclass_refcount;
+
+void measurement_alert_subclass_register(void)
+{
+	spin_lock(&ma_subclass_lock);
+	if (!ma_subclass_refcount)
+		ctl_set_bit(0, 5);
+	ma_subclass_refcount++;
+	spin_unlock(&ma_subclass_lock);
+}
+EXPORT_SYMBOL(measurement_alert_subclass_register);
+
+void measurement_alert_subclass_unregister(void)
+{
+	spin_lock(&ma_subclass_lock);
+	ma_subclass_refcount--;
+	if (!ma_subclass_refcount)
+		ctl_clear_bit(0, 5);
+	spin_unlock(&ma_subclass_lock);
+}
+EXPORT_SYMBOL(measurement_alert_subclass_unregister);