Commit 72b1e22d authored by Suresh Siddha's avatar Suresh Siddha Committed by Ingo Molnar
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x64, x2apic/intr-remap: generic irq migration support from process context 



Generic infrastructure for migrating the irq from the process context in the
presence of CONFIG_GENERIC_PENDING_IRQ.

This will be used later for migrating irq in the presence of
interrupt-remapping.

Signed-off-by: default avatarSuresh Siddha <suresh.b.siddha@intel.com>
Cc: akpm@linux-foundation.org
Cc: arjan@linux.intel.com
Cc: andi@firstfloor.org
Cc: ebiederm@xmission.com
Cc: jbarnes@virtuousgeek.org
Cc: steiner@sgi.com
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent b6fcb33a

include/linux/irq.h

+1 −0
Original line number Diff line number Diff line
@@ -62,6 +62,7 @@ typedef void (*irq_flow_handler_t)(unsigned int irq, 
#define IRQ_MOVE_PENDING	0x00200000	/* need to re-target IRQ destination */

#define IRQ_NO_BALANCING	0x00400000	/* IRQ is excluded from balancing */

#define IRQ_SPURIOUS_DISABLED	0x00800000	/* IRQ was disabled by the spurious trap */

#define IRQ_MOVE_PCNTXT	0x01000000	/* IRQ migration from process context */



#ifdef CONFIG_IRQ_PER_CPU

# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)

kernel/irq/manage.c

+8 −1
Original line number Diff line number Diff line
@@ -87,6 +87,13 @@ int irq_set_affinity(unsigned int irq, cpumask_t cpumask) 
	set_balance_irq_affinity(irq, cpumask);



#ifdef CONFIG_GENERIC_PENDING_IRQ

	if (desc->status & IRQ_MOVE_PCNTXT) {

		unsigned long flags;



		spin_lock_irqsave(&desc->lock, flags);

		desc->chip->set_affinity(irq, cpumask);

		spin_unlock_irqrestore(&desc->lock, flags);

	} else

		set_pending_irq(irq, cpumask);

#else

	desc->affinity = cpumask;