[patch 02/30] genirq: Move status flag checks to core

[Thomas Gleixner]

These checks are used by modules and prevent the removal of the export of
irq_to_desc(). Move the accessor into the core.

Signed-off-by: Thomas Gleixner <t...@linutronix.de>
---
 include/linux/irqdesc.h |   17 +++++------------
 kernel/irq/manage.c     |   17 +++++++++++++++++
 2 files changed, 22 insertions(+), 12 deletions(-)

--- a/include/linux/irqdesc.h
+++ b/include/linux/irqdesc.h
@@ -223,28 +223,21 @@ irq_set_chip_handler_name_locked(struct
        data->chip = chip;
 }
 
+bool irq_check_status_bit(unsigned int irq, unsigned int bitmask);
+
 static inline bool irq_balancing_disabled(unsigned int irq)
 {
-       struct irq_desc *desc;
-
-       desc = irq_to_desc(irq);
-       return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
+       return irq_check_status_bit(irq, IRQ_NO_BALANCING_MASK);
 }
 
 static inline bool irq_is_percpu(unsigned int irq)
 {
-       struct irq_desc *desc;
-
-       desc = irq_to_desc(irq);
-       return desc->status_use_accessors & IRQ_PER_CPU;
+       return irq_check_status_bit(irq, IRQ_PER_CPU);
 }
 
 static inline bool irq_is_percpu_devid(unsigned int irq)
 {
-       struct irq_desc *desc;
-
-       desc = irq_to_desc(irq);
-       return desc->status_use_accessors & IRQ_PER_CPU_DEVID;
+       return irq_check_status_bit(irq, IRQ_PER_CPU_DEVID);
 }
 
 static inline void
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -2769,3 +2769,23 @@ bool irq_has_action(unsigned int irq)
        return res;
 }
 EXPORT_SYMBOL_GPL(irq_has_action);
+
+/**
+ * irq_check_status_bit - Check whether bits in the irq descriptor status are 
set
+ * @irq:       The linux irq number
+ * @bitmask:   The bitmask to evaluate
+ *
+ * Returns: True if one of the bits in @bitmask is set
+ */
+bool irq_check_status_bit(unsigned int irq, unsigned int bitmask)
+{
+       struct irq_desc *desc;
+       bool res = false;
+
+       rcu_read_lock();
+       desc = irq_to_desc(irq);
+       if (desc)
+               res = !!(desc->status_use_accessors & bitmask);
+       rcu_read_unlock();
+       return res;
+}