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genirq: Move irq_has_action() into core code

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This function uses irq_to_desc() and is going to be used by modules to
replace the open coded irq_to_desc() (ab)usage. The final goal is to remove
the export of irq_to_desc() so driver cannot fiddle with it anymore.

Move it into the core code and fixup the usage sites to include the proper
header.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201210194042.548936472@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-12-10 20:25:37 +01:00
parent 3c41e57a1e
commit a313357e70
5 changed files with 21 additions and 7 deletions
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2
arch/alpha/kernel/sys_jensen.c
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@ -7,7 +7,7 @@
*
* Code supporting the Jensen.
*/
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/mm.h>

1
arch/x86/kernel/topology.c
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@ -25,6 +25,7 @@
*
* Send feedback to <colpatch@us.ibm.com>
*/
#include <linux/interrupt.h>
#include <linux/nodemask.h>
#include <linux/export.h>
#include <linux/mmzone.h>

1
include/linux/interrupt.h
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@ -232,6 +232,7 @@ extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
# define local_irq_enable_in_hardirq() local_irq_enable()
#endif
bool irq_has_action(unsigned int irq);
extern void disable_irq_nosync(unsigned int irq);
extern bool disable_hardirq(unsigned int irq);
extern void disable_irq(unsigned int irq);

7
include/linux/irqdesc.h
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@ -179,12 +179,7 @@ int handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq,
/* Test to see if a driver has successfully requested an irq */
static inline int irq_desc_has_action(struct irq_desc *desc)
{
return desc->action != NULL;
}
static inline int irq_has_action(unsigned int irq)
{
return irq_desc_has_action(irq_to_desc(irq));
return desc && desc->action != NULL;
}
/**

17
kernel/irq/manage.c
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@ -2822,3 +2822,20 @@ out_unlock:
return err;
}
EXPORT_SYMBOL_GPL(irq_set_irqchip_state);
/**
* irq_has_action - Check whether an interrupt is requested
* @irq: The linux irq number
*
* Returns: A snapshot of the current state
*/
bool irq_has_action(unsigned int irq)
{
bool res;
rcu_read_lock();
res = irq_desc_has_action(irq_to_desc(irq));
rcu_read_unlock();
return res;
}
EXPORT_SYMBOL_GPL(irq_has_action);