Merge commit '683b6c6f82' into stable/for-linus-3.15

This merge of the irq-core-for-linus branch broke the ARM build when
Xen is enabled.

Conflicts:
	drivers/xen/events/events_base.c

drivers/xen/balloon.c

@@ -399,12 +399,26 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
 			state = BP_EAGAIN;
 			break;
 		}
-
-		pfn = page_to_pfn(page);
-		frame_list[i] = pfn_to_mfn(pfn);
-
 		scrub_page(page);
 
+		frame_list[i] = page_to_pfn(page);
+	}
+
+	/*
+	 * Ensure that ballooned highmem pages don't have kmaps.
+	 *
+	 * Do this before changing the p2m as kmap_flush_unused()
+	 * reads PTEs to obtain pages (and hence needs the original
+	 * p2m entry).
+	 */
+	kmap_flush_unused();
+
+	/* Update direct mapping, invalidate P2M, and add to balloon. */
+	for (i = 0; i < nr_pages; i++) {
+		pfn = frame_list[i];
+		frame_list[i] = pfn_to_mfn(pfn);
+		page = pfn_to_page(pfn);
+
 #ifdef CONFIG_XEN_HAVE_PVMMU
 		/*
 		 * Ballooned out frames are effectively replaced with
@@ -429,11 +443,9 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
 		}
 #endif
 
-		balloon_append(pfn_to_page(pfn));
+		balloon_append(page);
 	}
 
-	/* Ensure that ballooned highmem pages don't have kmaps. */
-	kmap_flush_unused();
 	flush_tlb_all();
 
 	set_xen_guest_handle(reservation.extent_start, frame_list);

drivers/xen/events/events_2l.c

@@ -166,7 +166,6 @@ static void evtchn_2l_handle_events(unsigned cpu)
 	int start_word_idx, start_bit_idx;
 	int word_idx, bit_idx;
 	int i;
-	struct irq_desc *desc;
 	struct shared_info *s = HYPERVISOR_shared_info;
 	struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
 
@@ -176,11 +175,8 @@ static void evtchn_2l_handle_events(unsigned cpu)
 		unsigned int evtchn = evtchn_from_irq(irq);
 		word_idx = evtchn / BITS_PER_LONG;
 		bit_idx = evtchn % BITS_PER_LONG;
-		if (active_evtchns(cpu, s, word_idx) & (1ULL << bit_idx)) {
-			desc = irq_to_desc(irq);
-			if (desc)
-				generic_handle_irq_desc(irq, desc);
-		}
+		if (active_evtchns(cpu, s, word_idx) & (1ULL << bit_idx))
+			generic_handle_irq(irq);
 	}
 
 	/*
@@ -245,11 +241,8 @@ static void evtchn_2l_handle_events(unsigned cpu)
 			port = (word_idx * BITS_PER_EVTCHN_WORD) + bit_idx;
 			irq = get_evtchn_to_irq(port);
 
-			if (irq != -1) {
-				desc = irq_to_desc(irq);
-				if (desc)
-					generic_handle_irq_desc(irq, desc);
-			}
+			if (irq != -1)
+				generic_handle_irq(irq);
 
 			bit_idx = (bit_idx + 1) % BITS_PER_EVTCHN_WORD;
 

drivers/xen/events/events_base.c

@@ -336,9 +336,8 @@ static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
 
 	BUG_ON(irq == -1);
 #ifdef CONFIG_SMP
-	cpumask_copy(irq_to_desc(irq)->irq_data.affinity, cpumask_of(cpu));
+	cpumask_copy(irq_get_irq_data(irq)->affinity, cpumask_of(cpu));
 #endif
-
 	xen_evtchn_port_bind_to_cpu(info, cpu);
 
 	info->cpu = cpu;
@@ -373,10 +372,8 @@ static void xen_irq_init(unsigned irq)
 {
 	struct irq_info *info;
 #ifdef CONFIG_SMP
-	struct irq_desc *desc = irq_to_desc(irq);
-
 	/* By default all event channels notify CPU#0. */
-	cpumask_copy(desc->irq_data.affinity, cpumask_of(0));
+	cpumask_copy(irq_get_irq_data(irq)->affinity, cpumask_of(0));
 #endif
 
 	info = kzalloc(sizeof(*info), GFP_KERNEL);
@@ -495,13 +492,6 @@ static void pirq_query_unmask(int irq)
 		info->u.pirq.flags |= PIRQ_NEEDS_EOI;
 }
 
-static bool probing_irq(int irq)
-{
-	struct irq_desc *desc = irq_to_desc(irq);
-
-	return desc && desc->action == NULL;
-}
-
 static void eoi_pirq(struct irq_data *data)
 {
 	int evtchn = evtchn_from_irq(data->irq);
@@ -543,8 +533,7 @@ static unsigned int __startup_pirq(unsigned int irq)
 					BIND_PIRQ__WILL_SHARE : 0;
 	rc = HYPERVISOR_event_channel_op(EVTCHNOP_bind_pirq, &bind_pirq);
 	if (rc != 0) {
-		if (!probing_irq(irq))
-			pr_info("Failed to obtain physical IRQ %d\n", irq);
+		pr_warn("Failed to obtain physical IRQ %d\n", irq);
 		return 0;
 	}
 	evtchn = bind_pirq.port;
@@ -781,17 +770,12 @@ error_irq:
 
 int xen_destroy_irq(int irq)
 {
-	struct irq_desc *desc;
 	struct physdev_unmap_pirq unmap_irq;
 	struct irq_info *info = info_for_irq(irq);
 	int rc = -ENOENT;
 
 	mutex_lock(&irq_mapping_update_lock);
 
-	desc = irq_to_desc(irq);
-	if (!desc)
-		goto out;
-
 	/*
 	 * If trying to remove a vector in a MSI group different
 	 * than the first one skip the PIRQ unmap unless this vector
@@ -1265,6 +1249,7 @@ void xen_evtchn_do_upcall(struct pt_regs *regs)
 #ifdef CONFIG_X86
 	exit_idle();
 #endif
+	inc_irq_stat(irq_hv_callback_count);
 
 	__xen_evtchn_do_upcall();
 
@@ -1353,7 +1338,7 @@ static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
 static int set_affinity_irq(struct irq_data *data, const struct cpumask *dest,
 			    bool force)
 {
-	unsigned tcpu = cpumask_first(dest);
+	unsigned tcpu = cpumask_first_and(dest, cpu_online_mask);
 
 	return rebind_irq_to_cpu(data->irq, tcpu);
 }

drivers/xen/events/events_fifo.c

@@ -235,14 +235,10 @@ static uint32_t clear_linked(volatile event_word_t *word)
 static void handle_irq_for_port(unsigned port)
 {
 	int irq;
-	struct irq_desc *desc;
 
 	irq = get_evtchn_to_irq(port);
-	if (irq != -1) {
-		desc = irq_to_desc(irq);
-		if (desc)
-			generic_handle_irq_desc(irq, desc);
-	}
+	if (irq != -1)
+		generic_handle_irq(irq);
 }
 
 static void consume_one_event(unsigned cpu,