Commit eee45269 authored by Ivan Kokshaysky's avatar Ivan Kokshaysky Committed by Linus Torvalds
Browse files

[PATCH] Alpha: convert to generic irq framework (generic part) 



Thanks to Christoph for doing most of the work.

This allows automatic SMP IRQ affinity assignment other than default "all
interrupts on all CPUs" which is rather expensive.  This might be useful if
the hardware can be programmed to distribute interrupts among different
CPUs, like Alpha does.

Signed-off-by: default avatarIvan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 1fa744e6

include/linux/irq.h

+11 −0
Original line number Diff line number Diff line
@@ -221,6 +221,17 @@ extern void note_interrupt(unsigned int irq, irq_desc_t *desc, 
extern int can_request_irq(unsigned int irq, unsigned long irqflags);



extern void init_irq_proc(void);



#ifdef CONFIG_AUTO_IRQ_AFFINITY

extern int select_smp_affinity(unsigned int irq);

#else

static inline int

select_smp_affinity(unsigned int irq)

{

	return 1;

}

#endif



#endif



extern hw_irq_controller no_irq_type;  /* needed in every arch ? */

kernel/irq/manage.c

+2 −0
Original line number Diff line number Diff line
@@ -366,6 +366,8 @@ int request_irq(unsigned int irq, 
	action->next = NULL;

	action->dev_id = dev_id;



	select_smp_affinity(irq);



	retval = setup_irq(irq, action);

	if (retval)

		kfree(action);

kernel/irq/proc.c

+3 −1
Original line number Diff line number Diff line
@@ -68,7 +68,9 @@ static int irq_affinity_write_proc(struct file *file, const char __user *buffer, 
	 */

	cpus_and(tmp, new_value, cpu_online_map);

	if (cpus_empty(tmp))

		return -EINVAL;

		/* Special case for empty set - allow the architecture

		   code to set default SMP affinity. */

		return select_smp_affinity(irq) ? -EINVAL : full_count;



	proc_set_irq_affinity(irq, new_value);

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