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genirq: Expose default irq affinity mask (take 3)

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Current IRQ affinity interface does not provide a way to set affinity
for the IRQs that will be allocated/activated in the future.
This patch creates /proc/irq/default_smp_affinity that lets users set
default affinity mask for the newly allocated IRQs. Changing the default
does not affect affinity masks for the currently active IRQs, they
have to be changed explicitly.

Updated based on Paul J's comments and added some more documentation.

Signed-off-by: Max Krasnyansky <maxk@qualcomm.com>
Cc: pj@sgi.com
Cc: a.p.zijlstra@chello.nl
Cc: tglx@linutronix.de
Cc: rdunlap@xenotime.net
Cc: mingo@elte.hu
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Max Krasnyansky
2008-05-29 11:02:52 -07:00
committed by Thomas Gleixner
parent c3b25b32e8
commit 1840475676
7 changed files with 135 additions and 39 deletions
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5
include/linux/interrupt.h
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@@ -104,8 +104,11 @@ extern void enable_irq(unsigned int irq);
#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
extern cpumask_t irq_default_affinity;
extern int irq_set_affinity(unsigned int irq, cpumask_t cpumask);
extern int irq_can_set_affinity(unsigned int irq);
extern int irq_select_affinity(unsigned int irq);
#else /* CONFIG_SMP */
@@ -119,6 +122,8 @@ static inline int irq_can_set_affinity(unsigned int irq)
return 0;
}
static inline int irq_select_affinity(unsigned int irq) { return 0; }
#endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */
#ifdef CONFIG_GENERIC_HARDIRQS