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genirq: Expose irq_find_desc_at_or_after() in core code

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... in preparation for a smarter iterator for /proc/interrupts.

Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Tested-by: Michael Kelley <mhklinux@outlook.com>
Reviewed-by: Dmitry Ilvokhin <d@ilvokhin.com>
Link: https://patch.msgid.link/20260517194932.005787611@kernel.org
This commit is contained in:
Thomas Gleixner 2026-05-17 22:02:39 +02:00
parent 1d9c4745bf
commit 7603e0575d
2 changed files with 10 additions and 7 deletions
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2
kernel/irq/internals.h
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@ -155,6 +155,8 @@ void irq_proc_calc_prec(void);
static inline void irq_proc_calc_prec(void) { }
#endif
struct irq_desc *irq_find_desc_at_or_after(unsigned int offset);
extern bool irq_can_set_affinity_usr(unsigned int irq);
extern int irq_do_set_affinity(struct irq_data *data,

15
kernel/irq/irqdesc.c
View File

@ -181,15 +181,12 @@ static int irq_find_free_area(unsigned int from, unsigned int cnt)
return mas.index;
}
static unsigned int irq_find_at_or_after(unsigned int offset)
struct irq_desc *irq_find_desc_at_or_after(unsigned int offset)
{
unsigned long index = offset;
struct irq_desc *desc;
guard(rcu)();
desc = mt_find(&sparse_irqs, &index, total_nr_irqs);
return desc ? irq_desc_get_irq(desc) : total_nr_irqs;
lockdep_assert_in_rcu_read_lock();
return mt_find(&sparse_irqs, &index, total_nr_irqs);
}
static void irq_insert_desc(unsigned int irq, struct irq_desc *desc)
@ -934,7 +931,11 @@ EXPORT_SYMBOL_GPL(__irq_alloc_descs);
*/
unsigned int irq_get_next_irq(unsigned int offset)
{
return irq_find_at_or_after(offset);
struct irq_desc *desc;
guard(rcu)();
desc = irq_find_desc_at_or_after(offset);
return desc ? irq_desc_get_irq(desc) : total_nr_irqs;
}
struct irq_desc *__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,