From b2ce02817f202f1056f0de3f3d763085671d0494 Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Fri, 11 Feb 2022 19:14:54 +0100
Subject: [PATCH] genirq: Provide generic_handle_irq_safe().
References: SLE Realtime Extension
Patch-mainline: v5.18-rc1
Git-commit: 509853f9e1e7b1490dc79f735a5dbafc9298f40d
Provide generic_handle_irq_safe() which can used from any context.
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20220211181500.1856198-2-bigeasy@linutronix.de
Signed-off-by: Mel Gorman <mgorman@suse.de>
---
include/linux/irqdesc.h | 1 +
kernel/irq/irqdesc.c | 23 +++++++++++++++++++++++
2 files changed, 24 insertions(+)
diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h
index 59aea39785bf..d69b819b53e0 100644
--- a/include/linux/irqdesc.h
+++ b/include/linux/irqdesc.h
@@ -160,6 +160,7 @@ static inline void generic_handle_irq_desc(struct irq_desc *desc)
int handle_irq_desc(struct irq_desc *desc);
int generic_handle_irq(unsigned int irq);
+int generic_handle_irq_safe(unsigned int irq);
#ifdef CONFIG_IRQ_DOMAIN
/*
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index fadb93766020..975f0b3f9f1e 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -659,6 +659,29 @@ int generic_handle_irq(unsigned int irq)
}
EXPORT_SYMBOL_GPL(generic_handle_irq);
+/**
+ * generic_handle_irq_safe - Invoke the handler for a particular irq from any
+ * context.
+ * @irq: The irq number to handle
+ *
+ * Returns: 0 on success, a negative value on error.
+ *
+ * This function can be called from any context (IRQ or process context). It
+ * will report an error if not invoked from IRQ context and the irq has been
+ * marked to enforce IRQ-context only.
+ */
+int generic_handle_irq_safe(unsigned int irq)
+{
+ unsigned long flags;
+ int ret;
+
+ local_irq_save(flags);
+ ret = handle_irq_desc(irq_to_desc(irq));
+ local_irq_restore(flags);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(generic_handle_irq_safe);
+
#ifdef CONFIG_IRQ_DOMAIN
/**
* generic_handle_domain_irq - Invoke the handler for a HW irq belonging