linux-kernel - [tip: irq/core] genirq: Move status flag checks to core

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Date:   Sat, 12 Dec 2020 12:58:41 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org, maz@...nel.org
Subject: [tip: irq/core] genirq: Move status flag checks to core

The following commit has been merged into the irq/core branch of tip:

Commit-ID:     a578bb32cb1a46676caae72dc0c668630ab40c1f
Gitweb:        https://git.kernel.org/tip/a578bb32cb1a46676caae72dc0c668630ab40c1f
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Thu, 10 Dec 2020 20:25:38 +01:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Sat, 12 Dec 2020 12:59:02 +01:00

genirq: Move status flag checks to core

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 <tglx@...utronix.de>
Link: https://lore.kernel.org/r/20201210194042.703779349@linutronix.de

---
 include/linux/irqdesc.h | 17 +++++------------
 kernel/irq/manage.c     | 20 ++++++++++++++++++++
 2 files changed, 25 insertions(+), 12 deletions(-)

diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h
index 385a4fa..308d7db 100644
--- a/include/linux/irqdesc.h
+++ b/include/linux/irqdesc.h
@@ -223,28 +223,21 @@ irq_set_chip_handler_name_locked(struct irq_data *data, struct irq_chip *chip,
 	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
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 1767515..49950c3 100644
--- 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;
+}