genirq: Mirror IRQ_PER_CPU and IRQ_NO_BALANCING in irq_data.state

That's the right data structure to look at for arch code.

Accessor functions are provided.

	 irqd_is_per_cpu(irqdata);
	 irqd_can_balance(irqdata);

Coders who access them directly will be tracked down and slapped with
stinking trouts.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

6 files changed, 69 insertions, 14 deletions

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 73b2e7e00934..b8aa3dfe8301 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -706,12 +706,15 @@ void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
         if (!desc)
                 return;
 
-        /* Sanitize flags */
-        set &= IRQF_MODIFY_MASK;
-        clr &= IRQF_MODIFY_MASK;
-
         raw_spin_lock_irqsave(&desc->lock, flags);
-        desc->status &= ~clr;
-        desc->status |= set;
+
+        irq_settings_clr_and_set(desc, clr, set);
+
+        irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU);
+        if (irq_settings_has_no_balance_set(desc))
+                irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
+        if (irq_settings_is_per_cpu(desc))
+                irqd_set(&desc->irq_data, IRQD_PER_CPU);
+
         raw_spin_unlock_irqrestore(&desc->lock, flags);
 }
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index b2ba59e73f21..a80b44d2735e 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -139,3 +139,14 @@ static inline void irqd_clr_move_pending(struct irq_data *d)
         d->state_use_accessors &= ~IRQD_SETAFFINITY_PENDING;
         irq_compat_clr_move_pending(irq_data_to_desc(d));
 }
+
+static inline void irqd_clear(struct irq_data *d, unsigned int mask)
+{
+        d->state_use_accessors &= ~mask;
+}
+
+static inline void irqd_set(struct irq_data *d, unsigned int mask)
+{
+        d->state_use_accessors |= mask;
+}
+
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index f1cfa271ba70..84a0a9c22226 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -73,8 +73,8 @@ int irq_can_set_affinity(unsigned int irq)
 {
         struct irq_desc *desc = irq_to_desc(irq);
 
-        if ((desc->status & (IRQ_PER_CPU | IRQ_NO_BALANCING)) ||
-            !desc->irq_data.chip || !desc->irq_data.chip->irq_set_affinity)
+        if (!irqd_can_balance(&desc->irq_data) || !desc->irq_data.chip ||
+            !desc->irq_data.chip->irq_set_affinity)
                 return 0;
 
         return 1;
@@ -897,8 +897,10 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
                                   IRQS_INPROGRESS | IRQS_ONESHOT | \
                                   IRQS_WAITING);
 
-                if (new->flags & IRQF_PERCPU)
-                        desc->status |= IRQ_PER_CPU;
+                if (new->flags & IRQF_PERCPU) {
+                        irqd_set(&desc->irq_data, IRQD_PER_CPU);
+                        irq_settings_set_per_cpu(desc);
+                }
 
                 if (new->flags & IRQF_ONESHOT)
                         desc->istate |= IRQS_ONESHOT;
@@ -910,8 +912,10 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
                         desc->depth = 1;
 
                 /* Exclude IRQ from balancing if requested */
-                if (new->flags & IRQF_NOBALANCING)
-                        desc->status |= IRQ_NO_BALANCING;
+                if (new->flags & IRQF_NOBALANCING) {
+                        irq_settings_set_no_balancing(desc);
+                        irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
+                }
 
                 /* Set default affinity mask once everything is setup */
                 setup_affinity(irq, desc, mask);
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index 24f53caddf47..7a93c6b88b25 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -15,7 +15,7 @@ void move_masked_irq(int irq)
         /*
          * Paranoia: cpu-local interrupts shouldn't be calling in here anyway.
          */
-        if (desc->status & (IRQ_PER_CPU | IRQ_NO_BALANCING)) {
+        if (!irqd_can_balance(&desc->irq_data)) {
                 WARN_ON(1);
                 return;
         }
diff --git a/kernel/irq/settings.h b/kernel/irq/settings.h
index bb104a2dce73..ba0fffe410ad 100644
--- a/kernel/irq/settings.h
+++ b/kernel/irq/settings.h
@@ -4,6 +4,9 @@
  */
 enum {
         _IRQ_DEFAULT_INIT_FLAGS = IRQ_DEFAULT_INIT_FLAGS,
+        _IRQ_PER_CPU            = IRQ_PER_CPU,
+        _IRQ_NO_BALANCING       = IRQ_NO_BALANCING,
+        _IRQF_MODIFY_MASK       = IRQF_MODIFY_MASK,
 };
 
 #undef IRQ_INPROGRESS
@@ -22,3 +25,36 @@ enum {
 #define IRQ_WAKEUP              GOT_YOU_MORON
 #undef IRQ_MOVE_PENDING
 #define IRQ_MOVE_PENDING        GOT_YOU_MORON
+#undef IRQ_PER_CPU
+#define IRQ_PER_CPU             GOT_YOU_MORON
+#undef IRQ_NO_BALANCING
+#define IRQ_NO_BALANCING        GOT_YOU_MORON
+#undef IRQF_MODIFY_MASK
+#define IRQF_MODIFY_MASK        GOT_YOU_MORON
+
+static inline void
+irq_settings_clr_and_set(struct irq_desc *desc, u32 clr, u32 set)
+{
+        desc->status &= ~(clr & _IRQF_MODIFY_MASK);
+        desc->status |= (set & _IRQF_MODIFY_MASK);
+}
+
+static inline bool irq_settings_is_per_cpu(struct irq_desc *desc)
+{
+        return desc->status & _IRQ_PER_CPU;
+}
+
+static inline void irq_settings_set_per_cpu(struct irq_desc *desc)
+{
+        desc->status |= _IRQ_PER_CPU;
+}
+
+static inline void irq_settings_set_no_balancing(struct irq_desc *desc)
+{
+        desc->status |= _IRQ_NO_BALANCING;
+}
+
+static inline bool irq_settings_has_no_balance_set(struct irq_desc *desc)
+{
+        return desc->status & _IRQ_NO_BALANCING;
+}
diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
index 692ce2bae302..226ed7d26a84 100644
--- a/kernel/irq/spurious.c
+++ b/kernel/irq/spurious.c
@@ -68,7 +68,8 @@ static int try_one_irq(int irq, struct irq_desc *desc, bool force)
         raw_spin_lock(&desc->lock);
 
         /* PER_CPU and nested thread interrupts are never polled */
-        if (desc->status & (IRQ_PER_CPU | IRQ_NESTED_THREAD))
+        if (irq_settings_is_per_cpu(desc) ||
+            (desc->status & IRQ_NESTED_THREAD))
                 goto out;
 
         /*